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Q701. A high-pitch and a low-pitch sound have ___________, respectively.
· A) high amplitude and low frequency
· B) high frequency and low frequency
· C) low amplitude and high frequency
· D) low frequency and high frequency
Answer: B
Description: Answer: high frequency and low frequency। Pitch frequency पर निर्भर करती है। High-pitch sound की frequency अधिक और low-pitch sound की frequency कम होती है। इसलिए सही उत्तर option B है
Q702. Which of the following correctly lists the components of the vascular tissue known as xylem?
· A) Tracheids, vessels, xylem parenchyma, xylem fibres
· B) Sieve tubes, companion cells, phloem fibres, phloem parenchyma
· C) Companion cells, sieve cells, vessels, tracheids
· D) Tracheids, vessels, sieve tubes, xylem parenchyma
Answer: A
Description: Answer: Tracheids, vessels, xylem parenchyma, xylem fibres। ये सभी xylem tissue के components हैं। इसलिए सही उत्तर option A है
Q703. Which of the following correctly represents the total number of atoms in one molecule of ammonium sulphate ((NH₄)₂SO₄)?
· A) 16
· B) 10
· C) 14
· D) 15
Answer: D
Description: Answer: 15। (NH₄)₂SO₄ में atoms की संख्या = N₂ + H₈ + S₁ + O₄ = 2 + 8 + 1 + 4 = 15। इसलिए सही उत्तर option D है
Q704. Read the following statements carefully and select the INCORRECT one.
· A) Medulla oblongata controls reflex actions like pulling hand away from a hot object
· B) Cerebrum is the largest part of the human brain and is responsible for thinking and voluntary actions
· C) Spinal cord acts as a relay between the brain and the rest of the body and also controls reflex actions
· D) Cerebellum helps in maintaining body posture and balance
Answer: A
Description: Answer: Medulla oblongata controls reflex actions like pulling hand away from a hot object। Reflex actions का नियंत्रण spinal cord करता है, medulla oblongata नहीं। इसलिए सही उत्तर option A है
Q705. Which of the following is NOT correct?
· A) Pressure in a fluid depends on the shape of the container
· B) Pressure in a fluid acts in all directions
· C) Pressure = force/area
· D) Pressure in a fluid increases with depth
Answer: A
Description: Answer: Pressure in a fluid depends on the shape of the container। Fluid pressure container के shape पर निर्भर नहीं करता, बल्कि depth पर निर्भर करता है। इसलिए सही उत्तर option A है
Q706. In uniform circular motion, the direction of velocity of an object is:
· A) Along the radius, toward the center
· B) Along the radius, away from the center
· C) Tangential to the circular path
· D) Perpendicular to the axis of rotation
Answer: C
Description: Answer: Tangential to the circular path। Uniform circular motion में velocity हर बिंदु पर circle के tangent की दिशा में होती है। इसलिए सही उत्तर option C है
Q707. Which property enables carbon to form long chains?
· A) Catenation
· B) Isomerism
· C) Polymerisation
· D) Tetravalency
Answer: A
Description: Answer: Catenation। Carbon atoms के आपस में bond बनाकर लंबी chains बनाने की क्षमता को catenation कहते हैं। इसलिए सही उत्तर option A है
Q708. A wire of length ‘L’, area of cross-section ‘A’ and resistivity ‘ρ’ has a resistance ‘R’. What will be the new resistance of this wire if its area of cross-section is tripled? (Keep all the other parameters the same)
· A) 3R
· B) R/3
· C) R/9
· D) R
Answer: B
Description: Answer: R/3। Resistance formula R = ρL/A। Area तीन गुना होने पर resistance एक-तिहाई हो जाएगा। इसलिए सही उत्तर option B है
Q709. If the height of an image (h') is measured perpendicular to and below the principal axis (along the –y-axis), then what sign is assigned to its value according to the convention?
· A) Positive
· B) Neutral
· C) Dependent on the magnification
· D) Negative
Answer: D
Description: Answer: Negative। New Cartesian sign convention के अनुसार principal axis के नीचे मापी गई height negative मानी जाती है। इसलिए सही उत्तर option D है
Q710. What is the exact location of the kidneys in human beings?
· A) In the abdomen, on either side of the intestine
· B) In the abdomen, on either side of the back bone
· C) In the chest region, on either side of the lungs
· D) In the chest region, just below the heart
Answer: B
Description: Answer: In the abdomen, on either side of the back bone। Kidneys पेट के पीछे की ओर backbone के दोनों तरफ स्थित होती हैं। इसलिए सही उत्तर option B है
Q711. The motion of a satellite orbiting the Earth in a circular path at constant speed is a classic example of uniform circular motion. What property of this motion prevents its acceleration from being zero?
· A) The direction of motion changes continuously at every point, meaning the velocity is changing
· B) The object's mass continually changes due to orbital dynamics
· C) The total mechanical energy is conserved, necessitating acceleration
· D) The speed is too high for the gravitational force to sustain a constant velocity
Answer: A
Description: Answer: The direction of motion changes continuously at every point, meaning the velocity is changing। Uniform circular motion में speed constant रहती है लेकिन velocity की direction लगातार बदलती रहती है, इसलिए acceleration zero नहीं होती। इसलिए सही उत्तर option A है
Q712. Which of the following statements is
· A) Only (i)
· B) Both (ii) and (iii)
· C) Both (i) and (iii)
· D) Only (ii)
Answer: A
Description: Answer: Only (i)। Parallel combination में सभी resistors के across potential difference समान रहता है। Current अलग-अलग हो सकता है और equivalent resistance R₁ + R₂ नहीं होती। इसलिए सही उत्तर option A है
Q713. A sodium chloride crystal contains sodium and chloride ions in a 1:1 ratio. To calculate the formula unit mass of sodium chloride, which process would you use?
· A) Divide the atomic mass of sodium by that of chlorine
· B) Subtract the atomic mass of chlorine from that of sodium
· C) Add the atomic mass of sodium and the atomic mass of chlorine
· D) Multiply the atomic mass of sodium and the atomic mass of chlorine
Answer: C
Description: Answer: Add the atomic mass of sodium and the atomic mass of chlorine। NaCl का formula unit mass = Na का atomic mass + Cl का atomic mass। इसलिए सही उत्तर option C है
Q714. What is a key feature of Rutherford's atomic model?
· A) Atom is a uniform positive sphere throughout
· B) Nucleus contains only electrons with negative charge
· C) Electrons are fixed in shells around the nucleus
· D) Atom has a dense positive nucleus at the center
Answer: D
Description: Answer: Atom has a dense positive nucleus at the center। Rutherford model के अनुसार atom के केंद्र में एक छोटा, घना और positively charged nucleus होता है। इसलिए सही उत्तर option D है
Q715. Which of the following best describes the key feature of the velocity–time graph for an object moving with uniform velocity?
· A) It is a straight line parallel to the time axis
· B) It is a curved line
· C) It is a straight line parallel to the velocity axis
· D) It is a straight line inclined to the time axis
Answer: A
Description: Answer: It is a straight line parallel to the time axis। Uniform velocity में velocity constant रहती है, इसलिए velocity-time graph time axis के समानांतर सीधी रेखा होती है। इसलिए सही उत्तर option A है
Q716. Which of the statement(s) is
· A) Both (ii) and (iii)
· B) Both (iii) and (iv)
· C) Both (i) and (ii)
· D) Both (i) and (iii)
Answer: C
Description: Answer: Both (i) and (ii)। Scattering particle size पर निर्भर करता है और scattering wavelength के inversely proportional होता है। इसलिए (i) और (ii) गलत हैं। इसलिए सही उत्तर option C है
Q717. An object is thrown straight up and reaches a maximum height of 20 m. If we take g = 10 m
· A) 10 m/s
· B) 20 m/s
· C) 30 m/s
· D) 40 m/s
Answer: B
Description: Answer: 20 m/s। Formula: v² = u² - 2gh। Maximum height पर v = 0। इसलिए u² = 2 × 10 × 20 = 400 ⇒ u = 20 m/s। इसलिए सही उत्तर option B है
Q718. The energy possessed by a body due to its position or configuration is called ________.
· A) Thermal energy
· B) Chemical energy
· C) Potential energy
· D) Kinetic energy
Answer: C
Description: Answer: Potential energy। Position या configuration के कारण stored energy को potential energy कहते हैं। इसलिए सही उत्तर option C है
Q719. Which of the following is NOT due to refraction of light?
· A) Image formation by a convex lens
· B) Delayed Sunset
· C) Twinkling of stars
· D) Image formation by a convex mirror
Answer: D
Description: Answer: Image formation by a convex mirror। Convex mirror में image reflection के कारण बनती है, refraction के कारण नहीं। इसलिए सही उत्तर option D है
Q720. The process by which the eye lens changes its focal length to focus on near or distant objects is called __________.
· A) Adaptation
· B) Adjustment
· C) Accommodation
· D) Reflection
Answer: C
Description: Answer: Accommodation। Eye lens द्वारा focal length बदलकर वस्तुओं को स्पष्ट देखने की प्रक्रिया accommodation कहलाती है। इसलिए सही उत्तर option C है
Q721. An object is dropped from a height of 78.4 m. What is the time taken to reach the ground? (Use g = 9.8 m
· A) 2 s
· B) 6 s
· C) 4 s
· D) 5 s
Answer: C
Description: Answer: 4 s। Formula: s = 1/2 gt²। 78.4 = 1/2 × 9.8 × t² ⇒ 78.4 = 4.9t² ⇒ t² = 16 ⇒ t = 4 s। इसलिए सही उत्तर option C है
Q722. Which of the following is a colloidal solution?
· A) Sugar Solution
· B) Salt Water
· C) Sand in Water
· D) Milk
Answer: D
Description: Answer: Milk। Milk एक colloidal solution है जिसमें fat particles dispersed रहते हैं। इसलिए सही उत्तर option D है
Q723. Which of the following is a straight-chain saturated hydrocarbon?
· A) Benzene
· B) Propene
· C) Butane
· D) Cyclohexane
Answer: C
Description: Answer: Butane। Butane एक straight-chain alkane है और saturated hydrocarbon होता है। इसलिए सही उत्तर option C है
Q724. If a piece of aluminium is added to iron(II) sulphate (FeSO₄) solution, what will happen?
· A) There will be no reaction
· B) Blue solution will be formed
· C) Iron will get deposited
· D) Aluminium will get deposited
Answer: C
Description: Answer: Iron will get deposited। Aluminium iron से अधिक reactive है, इसलिए वह FeSO₄ से iron को displace कर देता है और iron deposit हो जाता है। इसलिए सही उत्तर option C है
Q725. The processes used for removing the gangue from the ore are based on the differences between which properties of the gangue and the ore?
· A) Only physical
· B) Refractive index
· C) Chemical or physical
· D) Only chemical
Answer: C
Description: Answer: Chemical or physical। Gangue removal की processes ore और gangue के physical या chemical properties के अंतर पर आधारित होती हैं। इसलिए सही उत्तर option C है
Q726. What is the primary function of the structure 'A' attached to the rough endoplasmic reticulum in the given diagram?
· A) Manufacturing proteins
· B) Storing genetic material
· C) Digestion of food particles
· D) Production of fat molecules
Answer: A
Description: Answer: Manufacturing proteins। Rough endoplasmic reticulum पर ribosomes जुड़े होते हैं, जिनका मुख्य कार्य protein synthesis करना है। इसलिए सही उत्तर option A है
Q727. A convex mirror always forms an image that is ________.
· A) virtual, erect, and larger than the object
· B) virtual, erect, and diminished
· C) real, erect, and same size as the object
· D) real, inverted, and smaller than the object
Answer: B
Description: Answer: virtual, erect, and diminished। Convex mirror हमेशा virtual, erect और छोटी image बनाता है। इसलिए सही उत्तर option B है
Q728. Which of the following statements correctly distinguishes a compound from a solution?
· A) A compound has a fixed composition and properties distinct from its constituent elements, unlike a solution
· B) A compound has a variable composition, while a solution has a fixed composition
· C) Both compound and solution are always homogeneous and chemically bonded
· D) A compound can be separated into its components by physical methods, while a solution cannot
Answer: A
Description: Answer: A compound has a fixed composition and properties distinct from its constituent elements, unlike a solution। Compound का composition निश्चित होता है और उसके गुण constituent elements से अलग होते हैं, जबकि solution का composition variable हो सकता है। इसलिए सही उत्तर option A है
Q729. A long straight wire carries a current I, and the magnetic field at a distance r from the conductor is B. If the distance from a straight current-carrying wire is doubled, what will be the magnetic field at that point?
· A) Zero
· B) B
· C) 2B
· D) B/2
Answer: D
Description: Answer: B/2। Straight current-carrying conductor के लिए magnetic field B ∝ 1/r। दूरी दोगुनी करने पर magnetic field आधी हो जाती है। इसलिए सही उत्तर option D है
Q730. Select the correct function of the smooth endoplasmic reticulum.
· A) Carbohydrate synthesis
· B) Lipid synthesis
· C) Protein synthesis
· D) Nucleic acid synthesis
Answer: B
Description: Answer: Lipid synthesis। Smooth endoplasmic reticulum मुख्यतः lipids और fats के synthesis का कार्य करता है। इसलिए सही उत्तर option B है
Q731. Which of the following cell organelles help(s) in cellular reproduction?
· A) Nucleus
· B) Lysosomes
· C) Plastids
· D) Endoplasmic Reticulum
Answer: A
Description: Answer: Nucleus। Nucleus genetic material को नियंत्रित करता है और cell division तथा reproduction में महत्वपूर्ण भूमिका निभाता है। इसलिए सही उत्तर option A है
Q732. An object is placed at 35.0 cm in front of a concave mirror of focal length 25.0 cm. At what distance from the mirror is an image formed?
· A) -8.75 cm
· B) -87.5 cm
· C) 10 cm
· D) 8.75 cm
Answer: B
Description: Answer: -87.5 cm। Mirror formula: 1/f = 1/v + 1/u। यहाँ f = -25 cm, u = -35 cm। इसलिए 1/v = -1/25 + 1/35 = -2/175 ⇒ v = -87.5 cm। इसलिए सही उत्तर option B है
Q733. An object is placed beyond the centre of curvature (C) of a concave mirror. The image formed will be now:
· A) Real, inverted, and magnified
· B) Real, inverted, and diminished
· C) Virtual, erect, and magnified
· D) Real, inverted, and same size
Answer: B
Description: Answer: Real, inverted, and diminished। Concave mirror में object को C से आगे रखने पर image F और C के बीच बनती है, जो real, inverted और छोटी होती है। इसलिए सही उत्तर option B है
Q734. Which of the following is NOT a function of the stigma in the Hibiscus flower?
· A) Receiving pollen grains
· B) Producing male germ cells
· C) Facilitating pollen tube growth
· D) Providing a sticky surface
Answer: B
Description: Answer: Producing male germ cells। Male germ cells pollen grains में बनते हैं, stigma का कार्य pollen receive करना और pollen tube growth में सहायता करना है। इसलिए सही उत्तर option B है
Q735. Which of the following statements best explains the Law of Constant Proportions?
· A) Mass can neither be created nor destroyed in a chemical reaction
· B) Atoms can be divided into smaller particles during a reaction
· C) A chemical compound always contains the same elements in the same proportion by mass
· D) Elements are always found in random ratios in a compound
Answer: C
Description: Answer: A chemical compound always contains the same elements in the same proportion by mass। Law of Constant Proportions के अनुसार किसी compound में elements निश्चित mass ratio में उपस्थित होते हैं। इसलिए सही उत्तर option C है
Q736. Washing soda is obtained from baking soda by which of the following processes?
· A) Adding hydrochloric acid to baking soda
· B) Heating baking soda followed by crystallisation from water
· C) Mixing baking soda with lime water
· D) Evaporation of baking soda in sunlight
Answer: B
Description: Answer: Heating baking soda followed by crystallisation from water। Baking soda को heat करने पर sodium carbonate बनता है, जिसे crystallisation द्वारा washing soda में बदला जाता है। इसलिए सही उत्तर option B है
Q737. What is the main function of muscular tissue in the human body?
· A) It produces movement by contracting and relaxing
· B) It stores energy and maintains body temperature
· C) It provides protection and structural support to organs
· D) It transmits impulses between different body organs
Answer: A
Description: Answer: It produces movement by contracting and relaxing। Muscular tissue contraction और relaxation द्वारा शरीर की movement कराता है। इसलिए सही उत्तर option A है
Q738. Which organism is a key indicator of a healthy aquatic ecosystem?
· A) Lichen
· B) Fish
· C) Cockroach
· D) Earthworm
Answer: B
Description: Answer: Fish। Healthy aquatic ecosystem में fish की उपस्थिति जल की अच्छी गुणवत्ता को दर्शाती है। इसलिए सही उत्तर option B है
Q739. Brass is an example of:
· A) a compound
· B) a homogeneous mixture
· C) a heterogeneous mixture
· D) an element
Answer: B
Description: Answer: a homogeneous mixture। Brass copper और zinc का homogeneous alloy है। इसलिए सही उत्तर option B है
Q740. Which of the following statements is true about mass?
· A) Mass depends on the location of the body
· B) Mass and weight are exactly the same
· C) Mass is a measure of inertia of a body
· D) Mass is a measure of the force acting on a body
Answer: C
Description: Answer: Mass is a measure of inertia of a body। Mass किसी वस्तु के inertia का माप है और यह स्थान के अनुसार नहीं बदलता। इसलिए सही उत्तर option C है
Q741. The increase in which of the following factor(s) will increase the resistance of a conductor?
· A) Only (iii)
· B) Only (i)
· C) Both (ii) and (iii)
· D) Both (i) and (ii)
Answer: D
Description: Answer: Both (i) and (ii)। Resistance temperature और length बढ़ाने से बढ़ता है, जबकि area of cross-section बढ़ाने से resistance घटता है। इसलिए सही उत्तर option D है
Q742. An object is thrown vertically upwards with velocity u. Under the influence of gravity, the acceleration:
· A) becomes zero at the highest point
· B) acts in the direction of motion
· C) increases the upward velocity
· D) acts opposite to the direction of motion
Answer: D
Description: Answer: acts opposite to the direction of motion। गुरुत्वाकर्षण का acceleration हमेशा नीचे की ओर कार्य करता है, इसलिए ऊपर जाती वस्तु की motion के opposite direction में होता है। इसलिए सही उत्तर option D है
Q743. Which of the following statements is NOT correct about linear velocity?
· A) It is the rate of change of displacement
· B) Linear velocity depends on displacement and time
· C) Linear velocity is constant for uniform motion
· D) The SI unit of linear velocity is m/s²
Answer: D
Description: Answer: The SI unit of linear velocity is m/s²। Linear velocity की SI unit m/s होती है, जबकि m/s² acceleration की unit है। इसलिए सही उत्तर option D है
Q744. Which of the following outcomes identifies meiosis rather than mitosis?
· A) Many cells, same number
· B) One larger cell, double number
· C) Four cells, half number
· D) Two identical cells, same number
Answer: C
Description: Answer: Four cells, half number। Meiosis में चार daughter cells बनती हैं जिनमें chromosomes की संख्या आधी होती है। इसलिए सही उत्तर option C है
Q745. The angle between the incident ray and the emergent ray of a prism is called:
· A) Angle of refraction
· B) Angle of deviation
· C) Angle of emergence
· D) Angle of incidence
Answer: B
Description: Answer: Angle of deviation। Prism में light ray के मुड़ने से incident और emergent ray के बीच बनने वाले angle को angle of deviation कहते हैं। इसलिए सही उत्तर option B है
Q746. The work done by friction on a moving object is usually ___________.
· A) negative
· B) zero
· C) positive
· D) both positive and negative
Answer: A
Description: Answer: negative। Friction motion के opposite direction में कार्य करता है, इसलिए उसका work सामान्यतः negative होता है। इसलिए सही उत्तर option A है
Q747. A block of mass 1 kg is dropped from the top of a building of height 20 m. What will be the velocity with which the block hits the ground? (Take g = 10 m
· A) 40 m/s
· B) 20 m/s
· C) √40 m/s
· D) √20 m/s
Answer: B
Description: Answer: 20 m/s। Formula: v² = u² + 2gh। यहाँ u = 0, h = 20 m। इसलिए v² = 2 × 10 × 20 = 400 ⇒ v = 20 m/s। इसलिए सही उत्तर option B है
Q748. Match the following plants with their correct modes of seed dispersal.
· A) 1–c, 2–d, 3–a, 4–b
· B) 1–c, 2–a, 3–d, 4–b
· C) 1–a, 2–d, 3–b, 4–c
· D) 1–b, 2–a, 3–d, 4–c
Answer: B
Description: Answer: 1–c, 2–a, 3–d, 4–b। Dandelions → wind, Lotus → water, Mango → animals, Castor → explosion method से disperse होते हैं। इसलिए सही उत्तर option B है
Q749. When BaCl₂ reacts with Na₂SO₄, the white precipitate is:
· A) Sodium carbonate which is insoluble
· B) Sodium chloride which crystallises
· C) Barium nitrate which is basic
· D) Barium sulphate which is insoluble
Answer: D
Description: Answer: Barium sulphate which is insoluble। Reaction: BaCl₂ + Na₂SO₄ → BaSO₄↓ + 2NaCl। इसमें BaSO₄ सफेद insoluble precipitate बनाता है। इसलिए सही उत्तर option D है
Q750. Study the experimental set up containing a water filled jar and an onion with growing roots set vertically up. Which type of tissue is present in the portion A of root tips of onion in full glass water?
· A) Meristematic tissue
· B) Sclerenchyma
· C) Parenchyma
· D) Collenchyma
Answer: A
Description: Answer: Meristematic tissue। Root tips में actively dividing cells उपस्थित होती हैं जिन्हें meristematic tissue कहते हैं। इसलिए सही उत्तर option A है
Q751. Which of the following is an example of basic salt?
· A) Ammonium chloride
· B) Sodium bicarbonate
· C) Sodium chloride
· D) Hydrogen chloride
Answer: B
Description: Answer: Sodium bicarbonate। Sodium bicarbonate (NaHCO₃) weak acid और strong base से बना basic salt है। इसलिए सही उत्तर option B है
Q752. Which of the following correctly describes the graphical representation of Ohm's law?
· A) A straight line parallel to x-axis
· B) A straight line through the origin
· C) An elliptical curve
· D) A hyperbolic curve
Answer: B
Description: Answer: A straight line through the origin। Ohm's law के अनुसार V ∝ I, इसलिए V-I graph origin से गुजरने वाली straight line होती है। इसलिए सही उत्तर option B है
Q753. The equivalent resistance in a parallel combination is:
· A) equal to the largest resistance
· B) greater than the largest resistance
· C) the sum of all resistances
· D) smaller than the smallest resistance
Answer: D
Description: Answer: smaller than the smallest resistance। Parallel combination में equivalent resistance हमेशा सबसे छोटे resistance से भी कम होती है। इसलिए सही उत्तर option D है
Q754. The crystalline lens of the eye mainly helps in:
· A) Providing fine adjustment of focal length
· B) Detecting colour of objects
· C) Sending signals to the brain
· D) Controlling the amount of light entering the eye
Answer: A
Description: Answer: Providing fine adjustment of focal length। Crystalline lens अपनी focal length बदलकर विभिन्न दूरी की वस्तुओं पर focus करने में सहायता करता है। इसलिए सही उत्तर option A है
Q755. The thalamus (receptacle) in flowers performs which of the following functions?
· A) Produces nectar
· B) Produces pollen grains
· C) Forms the ovules
· D) Supports flower parts and can become part of the fruit
Answer: D
Description: Answer: Supports flower parts and can become part of the fruit। Thalamus flower के विभिन्न भागों को support करता है और कुछ plants में fruit का हिस्सा बन सकता है। इसलिए सही उत्तर option D है
Q756. Which of the following events directly triggers the process of menstruation?
· A) Fertilisation of the egg
· B) Maturation of the egg
· C) Release of sperm into the vagina
· D) Non fertilisation of egg and hormonal changes
Answer: D
Description: Answer: Non fertilisation of egg and hormonal changes। यदि fertilisation नहीं होता, तो hormone levels में बदलाव के कारण uterus lining टूटकर menstruation होता है। इसलिए सही उत्तर option D है
Q757. Select the correct option with respect to the following statements.
· A) Statement 1, 2 and 3 are correct
· B) Statement 1 and 2 are correct
· C) Statement 1, 2 and 3 are incorrect
· D) Statement 2 and 3 are correct
Answer: D
Description: Answer: Statement 2 and 3 are correct। Suspension heterogeneous mixture होता है, इसलिए Statement-1 गलत है। Suspension के particles दिखाई देते हैं और समय के साथ नीचे बैठ जाते हैं। इसलिए सही उत्तर option D है
Q758. A yellow luminous flame is usually an indication of which of the following?
· A) Formation of carbon dioxide
· B) Incomplete combustion with unburnt carbon particles
· C) Combustion of metals
· D) Complete combustion
Answer: B
Description: Answer: Incomplete combustion with unburnt carbon particles। Yellow luminous flame incomplete combustion के कारण बनती है, जिसमें unburnt carbon particles उपस्थित होते हैं। इसलिए सही उत्तर option B है
Q759. Soap molecules arrange themselves in which form to perform cleaning action?
· A) Colloid
· B) Micelles
· C) Precipitation
· D) Crystal
Answer: B
Description: Answer: Micelles। Soap molecules पानी में micelles बनाते हैं, जो grease और dirt को हटाने में सहायता करते हैं। इसलिए सही उत्तर option B है
Q760. What is the primary reason ores are enriched prior to the extraction of metals?
· A) To alter the internal crystal structure of the ore for conversion
· B) To improve the final metal's resistance to corrosion and rust
· C) To eliminate earthy impurities such as sand and unwanted rock
· D) To enhance the melting point of the mineral content for refining
Answer: C
Description: Answer: To eliminate earthy impurities such as sand and unwanted rock। Ore enrichment का मुख्य उद्देश्य gangue या impurities को हटाना है। इसलिए सही उत्तर option C है
Q761. Which of the following statements about sexual reproduction is INCORRECT?
· A) It generates variations for species survival
· B) It combines DNA from two parents
· C) It produces identical clones
· D) It helps organisms adapt to changing environments
Answer: C
Description: Answer: It produces identical clones। Sexual reproduction variations उत्पन्न करता है, identical clones नहीं। इसलिए सही उत्तर option C है
Q762. A ball is thrown vertically upward with initial velocity (u). After time (t), its velocity (v) becomes __________.
· A) v = gt − u
· B) v = u + gt
· C) v = u·gt
· D) v = u − gt
Answer: D
Description: Answer: v = u − gt। ऊपर की ओर motion में gravity नीचे की ओर कार्य करती है, इसलिए velocity समय के साथ घटती है। इसलिए सही उत्तर option D है
Q763. Which of the following does NOT represent a pair of isotopes?
· A) Same atomic number but different mass numbers (³⁵₁₇Cl & ³⁸₁₇Cl)
· B) Same number of protons but different number of neutrons (³⁵₁₇Cl & ³⁷₁₇Cl)
· C) Different atomic numbers but same mass number (¹₁H & ²₁H)
· D) Atoms of the same element with different masses (³₁H & ²₁H)
Answer: C
Description: Answer: Different atomic numbers but same mass number। Isotopes में atomic number समान होता है लेकिन mass number अलग होता है। Different atomic numbers वाले atoms isotopes नहीं होते। इसलिए सही उत्तर option C है
Q764. Which statement is INCORRECT about a household electric circuit?
· A) All appliances are connected in parallel
· B) A fuse is always connected in the live wire
· C) Current through each appliance is the same
· D) A fuse protects the circuit from excessive current
Answer: C
Description: Answer: Current through each appliance is the same। Household circuit में appliances parallel में जुड़े होते हैं, इसलिए प्रत्येक appliance में current अलग-अलग हो सकता है। इसलिए सही उत्तर option C है
Q765. An electric bulb is rated 110 Watt – 220 Volt. The current drawn by the bulb is:
· A) 24,200 A
· B) 20 A
· C) 0.5 A
· D) 2 A
Answer: C
Description: Answer: 0.5 A। Formula: I = P/V = 110/220 = 0.5 A। इसलिए सही उत्तर option C है
Q766. An object placed between F and 2F of a convex lens forms an image _________.
· A) Beyond 2F, real, inverted, and enlarged
· B) At 2F, real, inverted, and diminished
· C) At infinity, real, inverted and same size
· D) Between F and the lens, virtual, erect, and diminished
Answer: A
Description: Answer: Beyond 2F, real, inverted, and enlarged। Convex lens में object को F और 2F के बीच रखने पर image 2F से आगे बनती है, जो real, inverted और enlarged होती है। इसलिए सही उत्तर option A है
Q767. Prokaryotic cells differ from eukaryotic cells in having which of the following?
· A) No membrane-bound nucleus
· B) Membrane-bound organelles
· C) A true nucleus
· D) Ribosomes
Answer: A
Description: Answer: No membrane-bound nucleus। Prokaryotic cells में true membrane-bound nucleus नहीं होता, जबकि eukaryotic cells में होता है। इसलिए सही उत्तर option A है
Q768. Which phenomenon shows the role of the cell wall in osmosis?
· A) Plasmolysis observed when living plant cells lose water
· B) Diffusion of gases through cell membrane
· C) Exchange of gases through stomata of leaves
· D) Absorption of light by chlorophyll during photosynthesis
Answer: A
Description: Answer: Plasmolysis observed when living plant cells lose water। Plasmolysis में cell membrane cell wall से अलग हो जाती है, जिससे osmosis में cell wall की भूमिका स्पष्ट होती है। इसलिए सही उत्तर option A है
Q769. Which of the following statements best describes allotropes of carbon?
· A) They are different isotopes of carbon with varying numbers of neutrons
· B) They are isomers of carbon, having the same molecular formula but different structures
· C) They are different structural forms of carbon with different physical properties but similar chemical properties
· D) They are compounds formed by carbon with different elements
Answer: C
Description: Answer: They are different structural forms of carbon with different physical properties but similar chemical properties। Carbon के allotropes जैसे diamond और graphite के physical properties अलग होते हैं लेकिन chemical properties समान रहती हैं। इसलिए सही उत्तर option C है
Q770. How are metals like gold and silver, which are low in reactivity, extracted?
· A) By simple heating or chemical methods
· B) By electrolytic reduction
· C) By reacting with acids
· D) By displacement reaction
Answer: A
Description: Answer: By simple heating or chemical methods। Low reactivity वाले metals को सामान्य heating या chemical reduction methods से निकाला जा सकता है। इसलिए सही उत्तर option A है
Q771. The angle between the incident ray and the emergent ray from a prism is called __________.
· A) Angle of prism
· B) Angle of incidence
· C) Critical angle
· D) Angle of deviation
Answer: D
Description: Answer: Angle of deviation। Prism से गुजरने पर light ray के मुड़ने के कारण incident और emergent rays के बीच बनने वाला angle angle of deviation कहलाता है। इसलिए सही उत्तर option D है
Q772. Which meristematic tissue has the highest levels of Auxin?
· A) Intercalary Meristematic tissue
· B) Lateral Meristematic tissue
· C) Xylem
· D) Apical Meristematic tissue
Answer: D
Description: Answer: Apical Meristematic tissue। Auxin मुख्य रूप से shoot apex और root apex में अधिक मात्रा में पाया जाता है। इसलिए सही उत्तर option D है
Q773. Which statement accurately describes a key difference between mixtures and compounds regarding separation?
· A) They are always formed with an absorption of heat
· B) They have a sharp melting and boiling point
· C) Their components can be separated by physical methods
· D) The identity of the original substances is lost
Answer: C
Description: Answer: Their components can be separated by physical methods। Mixtures के components physical methods से अलग किए जा सकते हैं, जबकि compounds के नहीं। इसलिए सही उत्तर option C है
Q774. According to the sign convention, the height of an erect image formed by a mirror is taken as:
· A) Negative
· B) Positive
· C) Imaginary
· D) Zero
Answer: B
Description: Answer: Positive। New Cartesian sign convention के अनुसार principal axis के ऊपर की height positive मानी जाती है। इसलिए erect image की height positive होती है। इसलिए सही उत्तर option B है
Q775. Due to the continuous random movement of the gas particles, the particles collide with the walls of the container. The pressure exerted by the gas is equal to the:
· A) force exerted by the gas particles on the walls of the container
· B) force exerted by the gas particles per unit area on the walls of the container
· C) force exerted by the gas particles per unit area of the bottom of the container
· D) force exerted by the gas particles per unit volume of the container
Answer: B
Description: Answer: force exerted by the gas particles per unit area on the walls of the container। Pressure की परिभाषा force per unit area है। इसलिए सही उत्तर option B है
Q776. An athlete runs on a circular track with a diameter of 300 m and completes one round in 50 seconds. If the athlete runs for 2 minutes and 30 seconds, what is the total distance covered from the starting point? (Use π = 3.14)
· A) Distance = 2826 m
· B) Distance = 942 m
· C) Distance = 1500 m
· D) Distance = 471 m
Answer: A
Description: Answer: 2826 m। Track की circumference = πd = 3.14 × 300 = 942 m। कुल समय = 150 s। Rounds = 150/50 = 3। कुल दूरी = 3 × 942 = 2826 m। इसलिए सही उत्तर option A है
Q777. Which of the following is a characteristic of a colloidal solution?
· A) Particles can be separated by filtration
· B) Particles scatter a beam of light
· C) Particles are invisible under a microscope
· D) Particles settle down on standing
Answer: B
Description: Answer: Particles scatter a beam of light। Colloidal particles Tyndall effect दिखाते हैं और light को scatter करते हैं। इसलिए सही उत्तर option B है
Q778. Which of the following observations could NOT be explained by Rutherford’s model of the atom?
· A) The presence of a positively charged nucleus in the atom
· B) The deflection of alpha particles at large angles
· C) The stability of the atom despite the presence of accelerating electrons
· D) The distribution of electrons around the nucleus
Answer: C
Description: Answer: The stability of the atom despite the presence of accelerating electrons। Rutherford model atom की stability को explain नहीं कर सका क्योंकि घूमते electrons energy lose करके nucleus में गिर जाने चाहिए थे। इसलिए सही उत्तर option C है
Q779. A triangular glass prism has how many rectangular lateral surfaces?
· A) Two
· B) Three
· C) One
· D) Four
Answer: B
Description: Answer: Three। Triangular prism में दो triangular faces और तीन rectangular lateral surfaces होती हैं। इसलिए सही उत्तर option B है
Q780. The absolute refractive index of a medium is defined as the ratio of ___________.
· A) speed of light in glass to speed of light in water
· B) speed of light in medium to speed of light in vacuum
· C) speed of light in vacuum to speed of light in medium
· D) speed of light in water to speed of light in medium
Answer: C
Description: Answer: speed of light in vacuum to speed of light in medium। Absolute refractive index n = c/v होता है, जहाँ c vacuum में light की speed और v medium में light की speed है। इसलिए सही उत्तर option C है
Q781. In the context of carbon compounds, what characterises a 'branched chain' structure?
· A) Carbon atoms are attached to the main carbon chain, forming side groups
· B) Carbon atoms are arranged in a continuous, straight line
· C) Carbon atoms are bonded to four different atoms
· D) Carbon atoms form a closed ring structure
Answer: A
Description: Answer: Carbon atoms are attached to the main carbon chain, forming side groups। Branched chain में मुख्य carbon chain से side branches जुड़ी होती हैं। इसलिए सही उत्तर option A है
Q782. An electric iron having resistance (R) has a power (P) associated with it when current (I) flows through it on applying potential difference (V) across its ends. Which of the following relations is NOT correct?
· A) P = V/I
· B) P = V²/R
· C) P = VI
· D) P = I²R
Answer: A
Description: Answer: P = V/I। Electric power के सही सूत्र हैं: P = VI, P = V²/R, और P = I²R। इसलिए P = V/I गलत relation है। इसलिए सही उत्तर option A है
Q783. For a given wave, if the speed becomes three times and the wavelength becomes three times, the frequency ______.
· A) becomes three times
· B) becomes nine times
· C) remains the same
· D) becomes one-third
Answer: C
Description: Answer: remains the same। Wave equation v = fλ। यदि v और λ दोनों 3 गुना हो जाएँ, तो frequency f अपरिवर्तित रहती है। इसलिए सही उत्तर option C है
Q784. Where is the centre of curvature of a convex mirror located?
· A) At the pole of the mirror
· B) In front of the mirror
· C) Behind the mirror
· D) At the principal focus of the mirror
Answer: C
Description: Answer: Behind the mirror। Convex mirror का centre of curvature mirror के पीछे स्थित होता है। इसलिए सही उत्तर option C है
Q785. If the length of a conductor and area is halved, keeping material same, then its resistance will ________.
· A) Be doubled
· B) Be halved
· C) Become four times
· D) Remain same
Answer: D
Description: Answer: Remain same। Resistance formula: R = ρL/A। यदि L और A दोनों आधे हो जाएँ, तो R = ρ(L/2)/(A/2) = ρL/A। इसलिए resistance में कोई परिवर्तन नहीं होगा। इसलिए सही उत्तर option D है
Q786. Two resistors, R₁ and R₂, are connected in parallel. Their equivalent resistance is 5 Ω. When one of them is removed, the resistance of the circuit increases to 10 Ω. Which of the following is the correct value of the other resistor?
· A) 15 Ω
· B) 20 Ω
· C) 5 Ω
· D) 10 Ω
Answer: D
Description: Answer: 10 Ω। Parallel में equivalent resistance 5 Ω है। एक resistor हटाने पर केवल दूसरा resistor बचता है जिसका resistance 10 Ω हो जाता है। इसलिए सही उत्तर option D है
Q787. According to Bohr’s model of the atom, in which orbits can electrons revolve around the nucleus?
· A) Spiral paths continuously losing energy
· B) Certain fixed circular paths called discrete orbits
· C) Any arbitrary circular path
· D) Elliptical orbits of variable energy
Answer: B
Description: Answer: Certain fixed circular paths called discrete orbits। Bohr model के अनुसार electrons निश्चित energy वाली fixed circular orbits में घूमते हैं। इसलिए सही उत्तर option B है
Q788. The direction of the magnetic field at the centre of a current-carrying circular loop can be determined by:
· A) Right-hand rule (curling fingers along current)
· B) Left-hand thumb rule
· C) Right-hand palm rule
· D) Fleming’s left-hand rule
Answer: A
Description: Answer: Right-hand rule (curling fingers along current)। Right-hand thumb rule के अनुसार उंगलियों को current की दिशा में मोड़ने पर thumb magnetic field की दिशा बताता है। इसलिए सही उत्तर option A है
Q789. In the given reaction, which of the following reactants has undergone oxidation? PbO + H₂ → Pb + H₂O
· A) H₂
· B) H₂O
· C) Pb
· D) PbO
Answer: A
Description: Answer: H₂। इस reaction में hydrogen oxygen प्राप्त करके H₂O बनाता है, इसलिए hydrogen का oxidation हुआ है। इसलिए सही उत्तर option A है
Q790. What unique property of carbon atoms enables them to form long and stable chains with other carbon atoms?
· A) Allotropy
· B) Catenation
· C) Isomerism
· D) Tetravalency
Answer: B
Description: Answer: Catenation। Carbon atoms की स्वयं से bond बनाने की क्षमता को catenation कहते हैं, जिससे long chains बनती हैं। इसलिए सही उत्तर option B है
Q791. Where does fertilisation usually occur in the female reproductive system?
· A) Vagina
· B) Cervix
· C) Uterus
· D) Oviduct
Answer: D
Description: Answer: Oviduct। Fertilisation सामान्यतः fallopian tube या oviduct में होता है। इसलिए सही उत्तर option D है
Q792. During the transformation of energy from one form to another, such as gravitational potential energy converting into kinetic energy during free fall, ___________.
· A) new energy is constantly created, balancing the loss of the original form
· B) the total mechanical energy increases, adhering to the law
· C) energy is gradually lost to the environment, violating the law
· D) the total energy before and after the transformation remains the same
Answer: D
Description: Answer: the total energy before and after the transformation remains the same। Energy conservation law के अनुसार कुल energy स्थिर रहती है, केवल उसका रूप बदलता है। इसलिए सही उत्तर option D है
Q793. Which enzyme is responsible for the breakdown of complex sugar molecules into simple glucose in human beings?
· A) Lipase
· B) Pepsin
· C) Amylase
· D) Bile Juice
Answer: C
Description: Answer: Amylase। Amylase enzyme starch जैसे complex carbohydrates को simple sugars में तोड़ता है। इसलिए सही उत्तर option C है
Q794. If the mass of the moon is doubled while keeping the distance between Earth and the moon constant, the gravitational force between Earth and the moon would:
· A) Remain the same
· B) Double
· C) Half
· D) Become zero
Answer: B
Description: Answer: Double। Gravitational force F = G(Mm)/r²। यदि moon का mass दोगुना हो जाए, तो force भी दोगुनी हो जाएगी। इसलिए सही उत्तर option B है
Q795. Refer to the two statements given below and choose the correct option.
· A) Both statements A and B are incorrect
· B) Statement A is incorrect but B is correct
· C) Statement A is correct but B is incorrect
· D) Both statements A and B are correct
Answer: C
Description: Answer: Statement A is correct but B is incorrect। Sodium hydroxide soaps और paper बनाने में उपयोग होता है, लेकिन यह weak base नहीं बल्कि strong base है। इसलिए सही उत्तर option C है
Q796. Which structure in Rhizopus is directly involved in the process of reproduction through spore formation?
· A) Mycelium
· B) Rhizoids
· C) Hyphae
· D) Sporangia
Answer: D
Description: Answer: Sporangia। Rhizopus में spores sporangia के अंदर बनते हैं। इसलिए सही उत्तर option D है
Q797. A car is moving with a speed of 180 km
· A) -36,000 N
· B) -42,000 N
· C) -50,000 N
· D) -15,120 N
Answer: B
Description: Answer: -42,000 N। प्रारंभिक वेग u = 180 km/h = 50 m/s, अंतिम वेग v = 0 तथा समय t = 5 s। इसलिए acceleration a = (v-u)/t = (0-50)/5 = -10 m/s²। अब Force F = ma = 4200 × (-10) = -42,000 N। इसलिए सही उत्तर option B है
Q798. When barium chloride reacts with aluminium sulphate, it gives aluminium chloride along with:
· A) a white colour precipitate of barium sulphate
· B) a white colour precipitate of barium oxide
· C) a yellow colour precipitate of barium sulphate
· D) a white colour precipitate of barium chloride
Answer: A
Description: Answer: a white colour precipitate of barium sulphate। Reaction: 3BaCl₂ + Al₂(SO₄)₃ → 3BaSO₄↓ + 2AlCl₃। इसमें BaSO₄ सफेद precipitate के रूप में बनता है। इसलिए सही उत्तर option A है
Q799. Which property distinguishes a compound from a mixture?
· A) Is always a solid
· B) Can exist in any state
· C) Has fixed composition and properties
· D) Is made of more than one substance
Answer: C
Description: Answer: Has fixed composition and properties। Compounds का composition निश्चित होता है तथा उनके गुण constituent substances से भिन्न होते हैं। इसलिए सही उत्तर option C है
Q800. The regular changes in the ovary and uterus during egg formation is called ________.
· A) circadian rhythm
· B) menstrual cycle
· C) fertilisation cycle
· D) estrous cycle
Answer: B
Description: Answer: menstrual cycle। Ovary और uterus में होने वाले नियमित hormonal changes को menstrual cycle कहा जाता है। इसलिए सही उत्तर option B है
Quiz 01: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 001 to 100Q
Quiz 02: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 101 to 200Q
Quiz 03: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 201 to 300Q
Quiz 04: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 301 to 400Q
Quiz 05: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 401 to 500Q
Quiz 06: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 501 to 600Q
Quiz 07: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 601 to 700Q
Quiz 08: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 701 to 800Q
Quiz 09: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 801 to 900Q
Quiz 10: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 901 to 1000Q
Quiz 11: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 1001 - 1100Q
Quiz 12: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 1101 - 1200Q
Quiz 13: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 1201 - 1300Q
Quiz 14: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 1301 - 1400Q
Quiz 15: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 1401 - 1500Q
Quiz 16: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 1501 - 1600Q
Quiz 17: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 1601 - 1700Q
Quiz 18: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 1701 - 1800Q
Quiz 19: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 1801 - 1900Q
Quiz 20: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 1901 - 2000Q
Quiz 21: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 2001 - 2100Q
Quiz 22: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 2101 - 2200Q
Quiz 23: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 2201 - 2300Q
Quiz 24: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 2301 - 2400Q
Quiz 25: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 2401 - 2500Q
Quiz 26: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 2501 - 2600Q
Quiz 27: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 2601 - 2700Q
Quiz 28: RRB GROUP-D LEVEL-1 2025-26 CBT GENERAL SCIENCE (LINK) 2701 - 2800Q
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