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Q501. What type of ions exchange between reactants in a double displacement reaction?
· A) Positive - positive ions
· B) Both positive - positive ions and negative - negative ions
· C) Positive - negative ions
· D) Negative - negative ions
Answer: C
Description: Answer: Positive - negative ions। Double displacement reaction में compounds अपने positive और negative ions का आदान-प्रदान करते हैं। इसलिए सही उत्तर option C है
Q502. Which of the following statements about a spherical lens is NOT correct?
· A) A concave lens also possesses two centres of curvature
· B) Every spherical lens has two centres of curvature
· C) The optical centre coincides with the centre of curvature
· D) The line joining the two centres of curvature is called the principal axis
Answer: C
Description: Answer: The optical centre coincides with the centre of curvature। Optical centre और centre of curvature अलग-अलग points होते हैं। इसलिए सही उत्तर option C है
Q503. Which of the following is NOT caused by atmospheric refraction?
· A) Advanced sunrise and delayed sunset
· B) Twinkling of stars
· C) Sun appearing higher in sky than its actual geometric position
· D) Reddish colour of sun at sunrise / sunset
Answer: D
Description: Answer: Reddish colour of sun at sunrise / sunset। यह घटना atmospheric scattering के कारण होती है, atmospheric refraction के कारण नहीं। इसलिए सही उत्तर option D है
Q504. A boy walks from one end A to the other end B of a straight 1000 m road in 2 minutes and then turns around and walks 400 m back to point C in another 2 minutes. What will be the average velocity (in m
· A) 25
· B) 15
· C) 2.5
· D) 150
Answer: C
Description: Answer: 2.5 m/s। Net displacement = 1000 - 400 = 600 m। Total time = 2 + 2 = 4 min = 240 s। Average velocity = 600/240 = 2.5 m/s। इसलिए सही उत्तर option C है
Q505. If a current of 4 A flows through a resistor of 50 Ω for 8 minutes, the heat produced is _________.
· A) 192 kJ
· B) 288 kJ
· C) 96 kJ
· D) 384 kJ
Answer: D
Description: Answer: 384 kJ। Joule’s law के अनुसार H = I²Rt। यहाँ I = 4 A, R = 50 Ω, t = 8 min = 480 s। इसलिए H = 4² × 50 × 480 = 384000 J = 384 kJ। इसलिए सही उत्तर option D है
Q506. In electrolytic refining, the pure metal is used as:
· A) a cathode
· B) an anode
· C) sulphur
· D) an electrolyte
Answer: A
Description: Answer: a cathode। Electrolytic refining में pure metal cathode के रूप में और impure metal anode के रूप में उपयोग किया जाता है। इसलिए सही उत्तर option A है
Q507. Which of the following is INCORRECT about striated muscle?
· A) Each striated muscle fibre contains a single nucleus
· B) These are present in limbs
· C) Mostly attached to bones and help in body movement
· D) Also called voluntary muscles
Answer: A
Description: Answer: Each striated muscle fibre contains a single nucleus। Striated muscle fibres बहुनाभिकीय (multinucleate) होते हैं। इसलिए सही उत्तर option A है
Q508. Which of the following is a psychological change associated with sexual maturity?
· A) Increased physical activity
· B) Hair growth on skin
· C) Desire of independence and mood swings
· D) Development of brain
Answer: C
Description: Answer: Desire of independence and mood swings। Adolescence के दौरान emotional changes और mood swings सामान्य psychological changes हैं। इसलिए सही उत्तर option C है
Q509. Which of the following is true about the cells of meristematic tissue?
· A) They are dead cells with no nucleus or cytoplasm
· B) They are loosely packed, mature cells with large intercellular spaces
· C) They are inactive with large vacuoles and thick walls
· D) They are active cells with dense cytoplasm, thin walls, prominent nuclei and no vacuoles
Answer: D
Description: Answer: They are active cells with dense cytoplasm, thin walls, prominent nuclei and no vacuoles। Meristematic cells actively divide करती हैं और इनमें vacuoles अनुपस्थित या बहुत छोटे होते हैं। इसलिए सही उत्तर option D है
Q510. Match the following body parts with the types of epithelial tissue found in them.
· A) A-4, B-2, C-3, D-1
· B) A-2, B-3, C-4, D-1
· C) A-1, B-2, C-3, D-4
· D) A-2, B-1, C-4, D-3
Answer: D
Description: Answer: A-2, B-1, C-4, D-3। Kidney tubules में cuboidal epithelium, skin पर stratified squamous epithelium, lung alveoli में simple squamous epithelium और respiratory tract lining में ciliated columnar epithelium पाया जाता है। इसलिए सही उत्तर option D है
Q511. In which carbon allotrope are atoms arranged in a hexagonal layer structure, with weak forces between layers?
· A) Fullerene
· B) Diamond
· C) Coke
· D) Graphite
Answer: D
Description: Answer: Graphite। Graphite में carbon atoms hexagonal layers बनाते हैं और layers के बीच weak van der Waals forces होती हैं। इसलिए सही उत्तर option D है
Q512. If both current and resistance are halved, the power reduces to _______.
· A) one-fourth of the initial value
· B) one-eighth of the initial value
· C) half of the initial value
· D) one-third of the initial value
Answer: B
Description: Answer: one-eighth of the initial value। Power P = I²R। यदि I और R दोनों आधे हो जाएँ, तो नया power = (I/2)² × (R/2) = I²R/8। इसलिए सही उत्तर option B है
Q513. If an object is kept at the focus F of a convex lens, where will the image be formed?
· A) Between F and 2F, real and magnified
· B) At infinity, highly magnified, real
· C) At 2F, real and same size as object
· D) At infinity, virtual and magnified
Answer: B
Description: Answer: At infinity, highly magnified, real। Convex lens में object focus पर रखने पर refracted rays parallel हो जाती हैं और image infinity पर बनती है। इसलिए सही उत्तर option B है
Q514. In the reaction MnO₂ + 4HCl → MnCl₂ + 2H₂O + Cl₂, which substance is oxidised and which substance is reduced?
· A) MnO₂ is reduced, MnCl₂ is oxidised
· B) MnO₂ is reduced, HCl is oxidised
· C) MnO₂ is oxidised, HCl is reduced
· D) MnCl₂ is oxidised, Cl₂ is reduced
Answer: B
Description: Answer: MnO₂ is reduced, HCl is oxidised। Mn का oxidation state +4 से +2 हो जाता है इसलिए MnO₂ reduced होता है, जबकि Cl⁻ से Cl₂ बनने पर oxidation होती है। इसलिए सही उत्तर option B है
Q515. According to Bohr's model, electromagnetic radiations possess dual character properties behaving like:
· A) waves and particles
· B) mass and magnetic effect
· C) waves and electrons
· D) sound and waves
Answer: A
Description: Answer: waves and particles। Electromagnetic radiations wave-particle dual nature दर्शाती हैं। इसलिए सही उत्तर option A है
Q516. Which of the following statements is INCORRECT regarding the shape and function of different cell types?
· A) Nerve cells are long and branched to carry messages across the body
· B) White blood cells can change shape to move through tissues
· C) Muscle cells are flat and circular to help them flow in blood
· D) Red blood cells are biconcave to increase oxygen-carrying capacity
Answer: C
Description: Answer: Muscle cells are flat and circular to help them flow in blood। यह RBC की विशेषता है, muscle cells की नहीं। Muscle cells लंबे/spindle-shaped होते हैं। इसलिए सही उत्तर option C है
Q517. If a book is lying on a table and is not moving, which of the forces are balanced?
· A) Only the weight of the book acts
· B) Weight of the book and friction
· C) Normal reaction and friction
· D) Weight of the book and normal reaction by the table
Answer: D
Description: Answer: Weight of the book and normal reaction by the table। किताब पर नीचे की ओर gravity (weight) और ऊपर की ओर table का normal reaction बराबर एवं विपरीत दिशा में कार्य करते हैं। इसलिए सही उत्तर option D है
Q518. The effect of multiple reflections of sound in large halls or auditoriums is, ________.
· A) it helps in uniform distribution of sound
· B) it converts sound into heat
· C) it blocks sound propagation
· D) it eliminates all echoes
Answer: A
Description: Answer: it helps in uniform distribution of sound। Multiple reflections के कारण sound hall में समान रूप से फैलती है। इसलिए सही उत्तर option A है
Q519. Which component(s) of blood is
· A) Plasma
· B) White blood cells
· C) Red blood corpuscles
· D) Platelets
Answer: A
Description: Answer: Plasma। Plasma nutrients, carbon dioxide, hormones और nitrogenous wastes को transport करता है। इसलिए सही उत्तर option A है
Q520. In a schematic electric circuit diagram, how is a voltmeter typically represented when connected to measure potential difference?
· A) A circle with a ‘V’ inside, connected in parallel
· B) A circle with an ‘A’ inside, connected in series
· C) A rectangle with an ‘R’ inside, connected in series
· D) A square with a ‘V’ inside, connected in parallel
Answer: A
Description: Answer: A circle with a ‘V’ inside, connected in parallel। Voltmeter को parallel में जोड़ा जाता है और इसका symbol V वाला circle होता है। इसलिए सही उत्तर option A है
Q521. A 100 W bulb is connected to a 220 V supply. The current through the bulb is approximately:
· A) 0.45 A
· B) 1.1 A
· C) 0.91 A
· D) 2.2 A
Answer: A
Description: Answer: 0.45 A। Power formula P = VI। इसलिए I = P/V = 100/220 ≈ 0.45 A इसलिए सही उत्तर option A है
Q522. A coil has a resistance of 44 Ω. If it is connected across a 220 V supply, what is the power consumed by the coil?
· A) 0.2 W
· B) 5 W
· C) 110 W
· D) 1100 W
Answer: D
Description: Answer: 1100 W। Power P = V²/R = 220²/44 = 1100 W इसलिए सही उत्तर option D है
Q523. Liquids are less compressible because:
· A) they have fixed mass always
· B) they contain dissolved gases
· C) particles have moderate gaps
· D) their density is always less than solids
Answer: C
Description: Answer: particles have moderate gaps। Liquids में particles के बीच थोड़ी जगह होती है, इसलिए वे gases की तुलना में कम compressible होते हैं। इसलिए सही उत्तर option C है
Q524. During electrolytic refining, which substance(s) get(s) collected at the cathode?
· A) Insoluble impurities and gases
· B) Pure form of the impure metal
· C) Organic matter left from ores
· D) The same metal with new bonds
Answer: B
Description: Answer: Pure form of the impure metal। Electrolytic refining में pure metal cathode पर deposit होता है। इसलिए सही उत्तर option B है
Q525. Select the option that is true regarding the following two statements labelled Assertion (A) and Reason (R). Assertion (A): Soap solution appears cloudy. Reason (R): The soap micelles are large enough to scatter light.
· A) Both A and R are true, and R is the correct explanation of A.
· B) A is false, but R is true.
· C) Both A and R are true, and R is not the correct explanation of A.
· D) A is true, but R is false.
Answer: A
Description: Answer: Both A and R are true, and R is the correct explanation of A। Soap solution colloidal nature का होता है और micelles light scatter करते हैं, जिससे solution cloudy दिखाई देता है। इसलिए सही उत्तर option A है
Q526. When a person looks at a nearby object, the ciliary muscles:
· A) Relax and make the lens thinner
· B) Contract and make the lens thicker
· C) Contract and make the lens thinner
· D) Relax and make the lens thicker
Answer: B
Description: Answer: Contract and make the lens thicker। पास की वस्तु को देखने के लिए ciliary muscles contract होती हैं जिससे lens मोटा हो जाता है और focal length कम हो जाती है। इसलिए सही उत्तर option B है
Q527. Which of the following statements is true about modern fish farming?
· A) All fish seeds are collected from rivers
· B) Enzymes are used to help fish grow bigger
· C) Fish farming cannot be done in ponds
· D) Hormones are used for fish breeding
Answer: D
Description: Answer: Hormones are used for fish breeding। Modern fish farming में induced breeding के लिए hormones का उपयोग किया जाता है। इसलिए सही उत्तर option D है
Q528. According to Newton’s third law, action and reaction forces:
· A) cancel each other out because they are equal
· B) act on two different objects at the same time
· C) act on the same object at the same time
· D) act on the same object at different times
Answer: B
Description: Answer: act on two different objects at the same time। Newton’s third law के अनुसार action और reaction equal और opposite होती हैं तथा अलग-अलग objects पर कार्य करती हैं। इसलिए सही उत्तर option B है
Q529. A rifle fires a light bullet, resulting in a large forward acceleration of the bullet and a minimal backward recoil acceleration of the rifle. If the forces are equal and opposite (Action
· A) The reaction force of the bullet acts for a shorter duration than the action force
· B) The acceleration is inversely proportional to the mass, and the rifle has a much greater mass than the bullet
· C) Action and reaction forces cancel out since they act instantaneously
· D) The action force of the rifle on the bullet is greater than the reaction force of the bullet on the rifle
Answer: B
Description: Answer: The acceleration is inversely proportional to the mass, and the rifle has a much greater mass than the bullet। Newton’s second law के अनुसार a = F/m। समान force पर अधिक mass वाले rifle का acceleration कम होगा। इसलिए सही उत्तर option B है
Q530. By how many degrees Celsius is the temperature of the scrotum lower than the normal body temperature?
· A) About 12°C
· B) About 6°C
· C) About 7°C
· D) About 3°C
Answer: D
Description: Answer: About 3°C। Scrotum का temperature body temperature से लगभग 2–3°C कम रहता है, जो sperm production के लिए आवश्यक है। इसलिए सही उत्तर option D है
Q531. Which of the following statements correctly describes the direction of conventional electric current?
· A) From the positive terminal to the negative terminal of a cell
· B) From the negative terminal to the positive terminal of a cell
· C) The same as the direction of the electrons' flow
· D) The direction is random and charges flow in a constant way
Answer: A
Description: Answer: From the positive terminal to the negative terminal of a cell। Conventional current की दिशा positive terminal से negative terminal की ओर मानी जाती है। इसलिए सही उत्तर option A है
Q532. Which of the following phenomena CANNOT be explained without dispersion of light?
· A) Rainbow formation
· B) Twinkling of stars
· C) Mirages
· D) Advanced sunrise
Answer: A
Description: Answer: Rainbow formation। Rainbow dispersion of light के कारण बनता है जिसमें white light विभिन्न colours में विभाजित होती है। इसलिए सही उत्तर option A है
Q533. Which of the following methods of asexual reproduction allows a new organism to develop from a cut or broken body part?
· A) Spore formation
· B) Binary fission
· C) Fragmentation
· D) Budding
Answer: C
Description: Answer: Fragmentation। Fragmentation में organism के टूटे हुए भाग नए organisms में विकसित हो जाते हैं। इसलिए सही उत्तर option C है
Q534. Which of the following statements about electric field lines is correct?
· A) They are always straight lines
· B) They can form closed loops
· C) They start on negative charges and end on positive charges
· D) They never intersect
Answer: D
Description: Answer: They never intersect। Electric field lines कभी एक-दूसरे को intersect नहीं करतीं क्योंकि किसी बिंदु पर electric field की केवल एक दिशा हो सकती है। इसलिए सही उत्तर option D है
Q535. Which of the following cause(s) movement in muscular tissue?
· A) Enzymes
· B) Cartilage
· C) Contractile proteins
· D) Ligaments
Answer: C
Description: Answer: Contractile proteins। Muscles में actin और myosin जैसे contractile proteins movement उत्पन्न करते हैं। इसलिए सही उत्तर option C है
Q536. What is the correct sequence of stages involved in budding in Hydra?
· A) New bud → Bud maturation → Bud separation → Bud formation
· B) Bud maturation → Bud formation → Bud separation → New bud
· C) Bud formation → Bud maturation → Bud separation → New bud
· D) Bud formation → Bud separation → Bud maturation → New bud
Answer: C
Description: Answer: Bud formation → Bud maturation → Bud separation → New bud। Hydra में पहले bud बनता है, फिर mature होता है, उसके बाद parent body से अलग होकर नया organism बनता है। इसलिए सही उत्तर option C है
Q537. What is the product formed when ethene reacts with bromine?
· A) Ethanol
· B) Bromoethane
· C) 1,2-dibromoethane
· D) Ethane
Answer: C
Description: Answer: 1,2-dibromoethane। Ethene एक unsaturated hydrocarbon है और bromine addition reaction द्वारा 1,2-dibromoethane बनाता है। इसलिए सही उत्तर option C है
Q538. In a v–t graph for uniform acceleration, which of the following is NOT correct?
· A) Positive slope indicates acceleration
· B) The v–t graph is always curved
· C) The area under the v–t graph gives displacement
· D) The slope of the v–t graph is constant
Answer: B
Description: Answer: The v–t graph is always curved। Uniform acceleration के लिए v–t graph straight line होता है, curved नहीं। इसलिए सही उत्तर option B है
Q539. A student places an object at a distance greater than twice the focal length from a convex lens. What kind of image is formed?
· A) Real, inverted, and larger than the object
· B) Virtual, erect, and smaller than the object
· C) Real, inverted, and smaller than the object
Answer: C
Description: Answer: Real, inverted, and smaller than the object। Convex lens में object को 2F से बाहर रखने पर image F और 2F के बीच बनती है, जो real, inverted और diminished होती है। इसलिए सही उत्तर option C है
Q540. What will be the acceleration due to gravity on a planet whose mass and radius are double that of the Earth? (Take the acceleration due to gravity on Earth as g.)
· A) 2g
· B) g
· C) g/4
· D) g/2
Answer: D
Description: Answer: g/2। गुरुत्वीय त्वरण g = GM/R²। यदि mass = 2M और radius = 2R, तो नया g = G(2M)/(2R)² = 2GM/4R² = g/2। इसलिए सही उत्तर option D है
Q541. Which of the following is
· A) Social problems
· B) Afforestation
· C) Deforestation
· D) Economic problems
Answer: B
Description: Answer: Afforestation। Large dams के कारण displacement, deforestation और economic/social problems हो सकती हैं, लेकिन afforestation सामान्य परिणाम नहीं है। इसलिए सही उत्तर option B है
Q542. Which of the following statements is correct regarding the mitochondria in a plant cell?
· A) Mitochondria does not have its own DNA
· B) Mitochondria has a single membranous covering
· C) Mitochondria performs photosynthesis
· D) The mitochondrial inner membrane is deeply folded
Answer: D
Description: Answer: The mitochondrial inner membrane is deeply folded। Mitochondria की inner membrane folds बनाती है जिन्हें cristae कहते हैं। इसलिए सही उत्तर option D है
Q543. Which of the following statements about the centre of curvature of a spherical mirror is NOT true?
· A) For a convex mirror, it lies behind the mirror
· B) It is not a part of the mirror itself
· C) It lies outside the reflecting surface of the mirror
· D) For a concave mirror, it is located behind the mirror
Answer: D
Description: Answer: For a concave mirror, it is located behind the mirror। Concave mirror का centre of curvature mirror के सामने स्थित होता है, पीछे नहीं। इसलिए सही उत्तर option D है
Q544. Which of the following is NOT a property associated with compounds?
· A) The composition of each new substance is always fixed
· B) The new substance has totally different properties
· C) The constituents can be separated fairly easily by physical methods
· D) Elements react to form new compounds
Answer: C
Description: Answer: The constituents can be separated fairly easily by physical methods। Compounds के constituents को physical methods से अलग नहीं किया जा सकता, इसके लिए chemical methods की आवश्यकता होती है। इसलिए सही उत्तर option C है
Q545. Which plastids contain pigments that give plants their yellow, orange or red colours?
· A) Leucoplasts
· B) Chloroplasts
· C) Chromoplasts
· D) Amyloplasts
Answer: C
Description: Answer: Chromoplasts। Chromoplasts में pigments होते हैं जो plants को yellow, orange और red colour देते हैं। इसलिए सही उत्तर option C है
Q546. A stone is thrown vertically upward with an initial velocity of 49 m
· A) 122.5 m
· B) 49 m
· C) 245 m
· D) 9.8 m
Answer: A
Description: Answer: 122.5 m। अधिकतम ऊँचाई h = u²/2g। यहाँ u = 49 m/s और g = 9.8 m/s²। इसलिए h = 49²/(2×9.8) = 122.5 m। इसलिए सही उत्तर option A है
Q547. The bud in Hydra:
· A) forms inside the parent’s body
· B) grows as an outgrowth
· C) develops on a stalk
· D) forms through spores
Answer: B
Description: Answer: grows as an outgrowth। Hydra में budding द्वारा reproduction होता है जिसमें bud parent body पर outgrowth के रूप में विकसित होती है। इसलिए सही उत्तर option B है
Q548. Which of the following statement(s) is
· A) Both (i) and (ii)
· B) Only (i)
· C) Only (ii)
· D) Neither (i) nor (ii)
Answer: B
Description: Answer: Only (i)। Fluids container की walls और base पर pressure exert करते हैं। Pascal’s law के अनुसार confined fluid में pressure सभी दिशाओं में समान रूप से transmit होता है, इसलिए statement (ii) गलत है। इसलिए सही उत्तर option B है
Q549. Which of the following is true about the homologous series?
· A) All members have the same boiling point
· B) All members have the same molecular weight
· C) Each successive member differs by -CH₂- group
· D) All members have different functional groups
Answer: C
Description: Answer: Each successive member differs by -CH₂- group। Homologous series में प्रत्येक अगला member पिछले member से एक -CH₂- group से भिन्न होता है। इसलिए सही उत्तर option C है
Q550. What do ‘check dams’ refer to?
· A) Earthen or concrete structures across flooded gullies
· B) Crescent-shaped hills for farming
· C) Dams built only for industrial water supply
· D) Small huts near rivers
Answer: A
Description: Answer: Earthen or concrete structures across flooded gullies। Check dams छोटे earthen या concrete barriers होते हैं जो water flow को नियंत्रित और groundwater recharge में मदद करते हैं। इसलिए सही उत्तर option A है
Q551. Why are autotrophs placed at the first trophic level in a food chain?
· A) Because they feed on herbivores
· B) Because they consume organic waste materials
· C) Because they decompose dead organisms
· D) Because they manufacture food from inorganic substances
Answer: D
Description: Answer: Because they manufacture food from inorganic substances। Autotrophs photosynthesis द्वारा inorganic substances से अपना भोजन स्वयं बनाते हैं, इसलिए वे producers कहलाते हैं। इसलिए सही उत्तर option D है
Q552. The dense structure inside the nucleus that produces ribosomes is called the _____.
· A) centrosome
· B) nucleolus
· C) lysosome
· D) mitochondria
Answer: B
Description: Answer: nucleolus। Nucleolus nucleus के अंदर ribosome synthesis का कार्य करता है। इसलिए सही उत्तर option B है
Q553. Which of the following is true for the plants raised by vegetative propagation?
· A) Statement A is incorrect but statement B is correct
· B) Both Statement A and statement B are correct
· C) Statement A is correct but statement B is incorrect
· D) Both Statement A and statement B are incorrect
Answer: C
Description: Answer: Statement A is correct but statement B is incorrect। Vegetative propagation से बने plants जल्दी flower और fruit देते हैं तथा वे parent plant के genetically identical होते हैं। इसलिए सही उत्तर option C है
Q554. In a running race, a boy starts at rest and reaches 60 m
· A) 12 m/s² and 9000 m
· B) 0.2 m/s² and 600 m
· C) 20 m/s² and 9 km
· D) 0.2 m/s² and 9 km
Answer: D
Description: Answer: 0.2 m/s² and 9 km। u = 0, v = 60 m/s, t = 5 min = 300 s। Acceleration a = (v-u)/t = 60/300 = 0.2 m/s²। Distance s = (u+v)/2 × t = (0+60)/2 × 300 = 9000 m = 9 km। इसलिए सही उत्तर option D है
Q555. When solutions of lead(II) nitrate and potassium iodide are mixed, the reaction leads to the formation of which of the following?
· A) A yellow precipitate of lead sulphate is formed
· B) An orange precipitate of lead iodate is formed
· C) An orange precipitate of lead iodide is formed
· D) A yellow precipitate of lead iodide is formed
Answer: D
Description: Answer: A yellow precipitate of lead iodide is formed। Pb(NO₃)₂ और KI की reaction से yellow precipitate PbI₂ बनता है। इसलिए सही उत्तर option D है
Q556. Which of the following metals is extracted in the middle of the activity series?
· A) Gold
· B) Iron
· C) Sodium
· D) Potassium
Answer: B
Description: Answer: Iron। Iron activity series के मध्य में स्थित metal है। इसलिए सही उत्तर option B है
Q557. If tall (T) is dominant over short (t), and round seeds (R) are dominant over wrinkled (r), identify the genotype of a plant that shows short height and round seeds.
· A) ttRR
· B) TtRr
· C) TtRR
· D) Ttrr
Answer: A
Description: Answer: ttRR। Short height के लिए genotype tt होना चाहिए क्योंकि short recessive trait है। Round seeds dominant trait है, इसलिए RR या Rr हो सकता है। दिए गए विकल्पों में केवल ttRR सही है। इसलिए सही उत्तर option A है
Q558. What type of gas is released when ethanol reacts with sodium?
· A) Carbon dioxide
· B) Hydrogen
· C) Oxygen
· D) Methane
Answer: B
Description: Answer: Hydrogen। Ethanol sodium के साथ reaction करके sodium ethoxide और hydrogen gas बनाता है। इसलिए सही उत्तर option B है
Q559. Which of the following best explains the term 'formula unit mass'?
· A) The mass of a single atom of an element
· B) The total mass of all atoms in one formula unit of a compound
· C) The mass of one mole of a substance
· D) The mass of a single molecule of an element
Answer: B
Description: Answer: The total mass of all atoms in one formula unit of a compound। Formula unit mass ionic compounds के formula unit में उपस्थित सभी atoms/ions के atomic masses का योग होता है। इसलिए सही उत्तर option B है
Q560. Which of the following plant tissues allows the movement of materials in both directions?
· A) Fibres
· B) Sclerenchyma
· C) Phloem
· D) Xylem
Answer: C
Description: Answer: Phloem। Phloem food materials को upward और downward दोनों directions में transport कर सकता है। इसलिए सही उत्तर option C है
Q561. Starting from rest, a car attains a velocity of 10 m
· A) -1 m/s² ; 0.5 m/s²
· B) 1 m/s² ; 0.5 m/s²
· C) 0.5 m/s² ; -1 m/s²
· D) 0.5 m/s² ; 1 m/s²
Answer: C
Description: Answer: 0.5 m/s² ; -1 m/s²। पहले भाग में a = (10-0)/20 = 0.5 m/s²। दूसरे भाग में a = (5-10)/5 = -1 m/s²। इसलिए सही उत्तर option C है
Q562. Which of the following correctly pairs a nerve type with its origin?
· A) Cranial nerves – Brain
· B) Spinal nerves – Heart
· C) Spinal nerves – Brain
· D) Cranial nerves – Spinal cord
Answer: A
Description: Answer: Cranial nerves – Brain। Cranial nerves brain से निकलती हैं जबकि spinal nerves spinal cord से निकलती हैं। इसलिए सही उत्तर option A है
Q563. Which process is used to prepare sodium hydroxide from brine?
· A) Solvay process
· B) Electrolysis of brine
· C) Haber process
· D) Thermal decomposition of NaCl
Answer: B
Description: Answer: Electrolysis of brine। Brine की electrolysis से sodium hydroxide, chlorine और hydrogen प्राप्त होते हैं। इसलिए सही उत्तर option B है
Q564. If a current-carrying conductor is placed in a magnetic field and the direction of current is reversed, the force on the conductor ________.
· A) becomes zero
· B) remains the same
· C) reverses direction
· D) doubles
Answer: C
Description: Answer: reverses direction। Fleming’s left-hand rule के अनुसार current की दिशा बदलने पर magnetic force की दिशा भी बदल जाती है। इसलिए सही उत्तर option C है
Q565. Identify the product in the reaction given below. CH₃–CH₂OH —(alkaline KMnO₄
· A) Propanal
· B) Ethanoic acid
· C) Propanone
· D) Ethanal
Answer: B
Description: Answer: Ethanoic acid। Ethanol का oxidation alkaline KMnO₄ या acidified K₂Cr₂O₇ की उपस्थिति में ethanoic acid बनाता है। इसलिए सही उत्तर option B है
Q566. Which of the following methods is part of the fresh initiatives in irrigation to improve water availability for crops?
· A) Sprinkler irrigation and ploughing
· B) Manuring and chemical spraying
· C) Drip irrigation and crop rotation
· D) Rainwater harvesting and watershed management
Answer: D
Description: Answer: Rainwater harvesting and watershed management। Water conservation और irrigation improvement के लिए rainwater harvesting तथा watershed management महत्वपूर्ण नई पहलें हैं। इसलिए सही उत्तर option D है
Q567. Which of the following is NOT a property of ionic compounds?
· A) They generally have high melting and boiling points
· B) They are generally solid at room temperature
· C) They are soluble in solvents such as kerosene and petrol
· D) They can conduct electricity in an aqueous/molten state
Answer: C
Description: Answer: They are soluble in solvents such as kerosene and petrol। Ionic compounds सामान्यतः water में soluble होते हैं लेकिन kerosene और petrol जैसे organic solvents में soluble नहीं होते। इसलिए सही उत्तर option C है
Q568. A battery of 12 V is connected in series with resistors of 1 Ω, 2 Ω, 3 Ω, 4 Ω and 10 Ω, respectively. How much current would flow through the 10 Ω resistor?
· A) 12 A
· B) 1.2 A
· C) 0.6 A
· D) 1.0 A
Answer: C
Description: Answer: 0.6 A। Total resistance = 1 + 2 + 3 + 4 + 10 = 20 Ω। Current I = V/R = 12/20 = 0.6 A। Series circuit में सभी resistors में समान current flow करता है। इसलिए सही उत्तर option C है
Q569. 200 J of heat is produced per second in an 8 Ω resistance. What is the potential difference across the resistor?
· A) 30 V
· B) 40 V
· C) 20 V
· D) 50 V
Answer: B
Description: Answer: 40 V। Heat produced per second = Power = 200 W। Formula P = V²/R। इसलिए V² = PR = 200 × 8 = 1600। अतः V = 40 V। इसलिए सही उत्तर option B है
Q570. What type of epithelial tissue is the outer skin made of?
· A) Stratified squamous epithelium
· B) Simple squamous epithelium
· C) Columnar epithelium
· D) Cuboidal epithelium
Answer: A
Description: Answer: Stratified squamous epithelium। Skin की outer layer protection के लिए stratified squamous epithelium से बनी होती है। इसलिए सही उत्तर option A है
Q571. The principal focus of a convex lens is _______.
· A) the point where diverging rays meet
· B) always at infinity
· C) the point where parallel rays converge
· D) the point behind the lens where rays diverge
Answer: C
Description: Answer: the point where parallel rays converge। Convex lens parallel rays को refract करके principal focus पर converge करता है। इसलिए सही उत्तर option C है
Q572. Two wires, A and B, of the same material, have the same length, but the cross sectional area of wire A is twice that of wire B. The ratio of their resistances Rₐ : Rᵦ is:
· A) 1 : 1
· B) 2 : 1
· C) 4 : 1
· D) 1 : 2
Answer: D
Description: Answer: 1 : 2। Resistance R = ρL/A। Resistance area के inversely proportional होती है। यदि A का area B से दोगुना है, तो A की resistance आधी होगी। इसलिए Rₐ : Rᵦ = 1 : 2। सही उत्तर option D है
Q573. Which of the following cell organelles do NOT have their own DNA?
· A) Lysosomes
· B) Mitochondria
· C) Nucleus
· D) Plastids
Answer: A
Description: Answer: Lysosomes। Mitochondria, nucleus और plastids में DNA पाया जाता है, जबकि lysosomes में अपना DNA नहीं होता। इसलिए सही उत्तर option A है
Q574. The absolute refractive index of a material is 4
· A) 4 × 10⁸ m/s
· B) 2.25 × 10⁸ m/s
· C) 1.33 × 10⁸ m/s
· D) 3 × 10⁸ m/s
Answer: B
Description: Answer: 2.25 × 10⁸ m/s। Refractive index n = c/v। इसलिए v = c/n = (3 × 10⁸)/(4/3) = 2.25 × 10⁸ m/s। इसलिए सही उत्तर option B है
Q575. Which of the following is true for suspension?
· A) Only a
· B) Only a and c
· C) a, b and c
· D) Only a and b
Answer: C
Description: Answer: a, b and c। Suspension heterogeneous mixture होता है, इसके particles light scatter करते हैं और naked eye से दिखाई देते हैं। इसलिए सही उत्तर option C है
Q576. Which category of sound frequency is used by rhinoceroses, whales, and elephants for communication?
· A) Supersonic sound
· B) Audible sound
· C) Ultrasound
· D) Infrasound
Answer: D
Description: Answer: Infrasound। ये animals low frequency infrasound waves का उपयोग लंबी दूरी तक communication के लिए करते हैं। इसलिए सही उत्तर option D है
Q577. Which of the following is true?
· A) Advanced sunrise and delayed sunset is due to scattering of light
· B) Advanced sunrise and delayed sunset is due to Earth’s rotation only
· C) Advanced sunrise and delayed sunset is due to atmospheric refraction
· D) Advanced sunrise is due to scattering and delayed sunset is due to refraction
Answer: C
Description: Answer: Advanced sunrise and delayed sunset is due to atmospheric refraction। पृथ्वी के atmosphere में light के bending के कारण सूर्योदय जल्दी और सूर्यास्त देर से दिखाई देता है। इसलिए सही उत्तर option C है
Q578. Read the given Assertion (A) and Reason (R) carefully and select the correct option. Assertion (A): Sound waves are transverse waves. Reason (R): Sound waves require a material medium for their propagation.
· A) Both assertion and reason are true and reason is the correct explanation of assertion
· B) Both assertion and reason are false
· C) Assertion is false and reason is true
· D) Assertion is true but reason is false
Answer: C
Description: Answer: Assertion is false and reason is true। Sound waves longitudinal waves होती हैं, transverse नहीं। लेकिन sound waves को propagate होने के लिए material medium की आवश्यकता होती है। इसलिए सही उत्तर option C है
Q579. Which of the following experimental observations provides the strongest evidence for the existence of particles in matter?
· A) Ice melts into water when heated
· B) Salt dissolves faster in warm water than in cold water
· C) A drop of ink spreads evenly in water without stirring
· D) Water boils and produces steam
Answer: C
Description: Answer: A drop of ink spreads evenly in water without stirring। Ink का अपने आप water में फैलना diffusion कहलाता है, जो दर्शाता है कि matter छोटे-छोटे particles से बना है जो लगातार गति करते रहते हैं। इसलिए सही उत्तर option C है
Q580. Cyclohexane is best classified as which type of organic compound?
· A) An organic aldehyde consisting of a linear chain of six carbon atoms
· B) A saturated alicyclic compound composed of six carbon atoms in a ring
· C) A branched hydrocarbon with one or more unsaturated carbon bonds
· D) An aromatic compound containing a delocalised π-electron ring system
Answer: B
Description: Answer: A saturated alicyclic compound composed of six carbon atoms in a ring। Cyclohexane एक saturated cyclic hydrocarbon है जिसमें छह carbon atoms ring बनाते हैं। इसलिए सही उत्तर option B है
Q581. Which of the following is NOT correct?
· A) In the electrical circuit, if the switch is open, no current flows
· B) In the electrical circuit, the direction of current is taken from the positive to the negative terminal
· C) A bulb glows only in a closed circuit
· D) In the electrical circuit, the voltmeter is connected in series with the component
Answer: D
Description: Answer: In the electrical circuit, the voltmeter is connected in series with the component। Voltmeter हमेशा parallel में जोड़ा जाता है, series में नहीं। इसलिए सही उत्तर option D है
Q582. Sound waves in air are longitudinal because:
· A) Particles move perpendicular to direction of propagation
· B) Particles move along the direction of propagation
· C) Particles move randomly
· D) Air molecules do not vibrate
Answer: B
Description: Answer: Particles move along the direction of propagation। Longitudinal waves में particles wave propagation की दिशा के समानांतर vibrate करते हैं। इसलिए सही उत्तर option B है
Q583. Which of the following is responsible for positive geotropism movement in plants?
· A) Chemical
· B) Water
· C) Light
· D) Gravity
Answer: D
Description: Answer: Gravity। Positive geotropism में plant roots gravity की दिशा में बढ़ती हैं। इसलिए सही उत्तर option D है
Q584. Which of the following is NOT a method of irrigation?
· A) Wells
· B) Check dams
· C) River lift systems
· D) Canals
Answer: B
Description: Answer: Check dams। Wells, river lift systems और canals irrigation methods हैं, जबकि check dams मुख्यतः water conservation और groundwater recharge के लिए उपयोग होते हैं। इसलिए सही उत्तर option B है
Q585. Some organisms take in whole food material and break it down inside their bodies. This is called ________ nutrition.
· A) autotrophic
· B) saprophytic
· C) parasitic
· D) holozoic
Answer: D
Description: Answer: holozoic। Holozoic nutrition में organisms food को ingest करके शरीर के अंदर digest करते हैं। इसलिए सही उत्तर option D है
Q586. What is the primary role of a 'functional group' in an organic compound?
· A) To change the carbon chain from straight to branched
· B) To increase the molecular mass of the compound
· C) To determine the physical state (solid, liquid, gas) of the compound
· D) To provide the characteristic chemical properties of the compound
Answer: D
Description: Answer: To provide the characteristic chemical properties of the compound। Functional group compound के chemical behaviour और reactions को निर्धारित करता है। इसलिए सही उत्तर option D है
Q587. A student shows a concave lens forming a diminished real image on the screen. The mistake is:
· A) Concave lens does not refract light
· B) Concave lens cannot form a magnified image
· C) Concave lens always converges light
· D) Concave lens cannot form a real image
Answer: D
Description: Answer: Concave lens cannot form a real image। Concave lens हमेशा virtual, erect और diminished image बनाता है, real image नहीं। इसलिए सही उत्तर option D है
Q588. The process used for removing gangue from the ore works on the basis of difference of their chemical or physical properties and is called ______ of ores.
· A) weighing
· B) polishing
· C) colouring
· D) enrichment
Answer: D
Description: Answer: enrichment। Ore से impurities (gangue) हटाने की process को enrichment or concentration of ores कहते हैं। इसलिए सही उत्तर option D है
Q589. Which of the following statements is correct for the magnetic field inside a long, straight, current-carrying solenoid?
· A) It increases as we move towards its end
· B) It decreases as we move towards its end
· C) It is the same at all points
· D) It is zero
Answer: C
Description: Answer: It is the same at all points। Long solenoid के अंदर magnetic field लगभग uniform होती है और सभी points पर समान रहती है। इसलिए सही उत्तर option C है
Q590. Which of the following statements is true about work done by a constant force?
· A) It depends on the path of motion
· B) It depends only on the initial and final positions
· C) It is independent of displacement
· D) It is always positive
Answer: B
Description: Answer: It depends only on the initial and final positions। Constant force द्वारा किया गया work displacement पर निर्भर करता है, path पर नहीं। इसलिए सही उत्तर option B है
Q591. Which of the following acts as an olfactory indicator in acid-base reactions?
· A) Onion extract changes smell in bases
· B) Turmeric turns blue in bases
· C) Phenolphthalein turns pink in acids
· D) Methyl orange produces odour in base
Answer: A
Description: Answer: Onion extract changes smell in bases। Onion, clove oil आदि olfactory indicators हैं जिनकी smell acidic/basic medium में बदलती है। इसलिए सही उत्तर option A है
Q592. In the reaction between aqueous sodium sulphate and aqueous barium chloride, which compound forms the white precipitate?
· A) Barium chloride (BaCl₂)
· B) Sodium sulphate (Na₂SO₄)
· C) Barium sulphate (BaSO₄)
· D) Sodium chloride (NaCl)
Answer: C
Description: Answer: Barium sulphate (BaSO₄)। Reaction: Na₂SO₄ + BaCl₂ → BaSO₄↓ + 2NaCl BaSO₄ insoluble white precipitate के रूप में बनता है। इसलिए सही उत्तर option C है
Q593. A ship floats on water because:
· A) the atmospheric pressure supports the ship
· B) the density of water is greater than that of the ship material
· C) the surface tension holds it afloat
· D) the weight of water displaced equals the weight of the ship
Answer: D
Description: Answer: the weight of water displaced equals the weight of the ship। Archimedes’ principle के अनुसार जब displaced water का weight जहाज के weight के बराबर हो जाता है, तब जहाज तैरता है। इसलिए सही उत्तर option D है
Q594. In which of the following reactions does colour change, gas evolution, and solid residue formation, all occur simultaneously during decomposition?
· A) 2AgCl → 2Ag + Cl₂
· B) Pb(NO₃)₂ → PbO + NO₂ + O₂
· C) CaCO₃ → CaO + CO₂
· D) 2KClO₃ → 2KCl + 3O₂
Answer: B
Description: Answer: Pb(NO₃)₂ → PbO + NO₂ + O₂। इस reaction में white lead nitrate heat करने पर yellow PbO residue बनता है, brown NO₂ gas निकलती है और O₂ gas भी evolve होती है। इसलिए सही उत्तर option B है
Q595. Newton's third law of motion deals with the nature of _________.
· A) forces always occurring in pairs
· B) a single object resisting a change in motion
· C) the relationship between mass and acceleration
· D) the force of gravity acting on a falling object
Answer: A
Description: Answer: forces always occurring in pairs। Newton’s third law कहता है कि हर action force के बराबर और विपरीत दिशा में एक reaction force होता है। इसलिए सही उत्तर option A है
Q596. Which process best explains how water droplets form on the outer surface of a cold glass during a hot day?
· A) Sublimation
· B) Evaporation
· C) Freezing
· D) Condensation
Answer: D
Description: Answer: Condensation। Air में उपस्थित water vapour ठंडी surface के संपर्क में आकर liquid droplets में बदल जाती है, इसे condensation कहते हैं। इसलिए सही उत्तर option D है
Q597. When the current in a circuit is doubled, keeping resistance constant, the power dissipated in the resistor becomes:
· A) One-fourth
· B) Half
· C) Four times
· D) Double
Answer: C
Description: Answer: Four times। Power P = I²R। यदि current दोगुना हो जाए, तो नया power = (2I)²R = 4I²R। इसलिए power चार गुना हो जाएगी। सही उत्तर option C है
Q598. The centre of curvature of a concave mirror is:
· A) The point on the principal axis where image of an object at infinity is formed
· B) The geometric centre of the spherical surface of which the mirror is a part
· C) The point where parallel rays of light meet after reflection
· D) The midpoint of the mirror’s aperture
Answer: B
Description: Answer: The geometric centre of the spherical surface of which the mirror is a part। Centre of curvature वह point है जो उस sphere का centre होता है जिसका mirror एक भाग होता है। इसलिए सही उत्तर option B है
Q599. How many contrasting characters were used by Mendel to formulate the laws of inheritance?
· A) 5
· B) 7
· C) 4
· D) 8
Answer: B
Description: Answer: 7। Mendel ने pea plants में 7 contrasting characters का अध्ययन किया था। इसलिए सही उत्तर option B है
Q600. Which of the following represents an end product of anaerobic respiration in animals?
· A) Oxygen
· B) Carbon monoxide
· C) Lactic acid
· D) Glucose
Answer: C
Description: Answer: Lactic acid। Animals की muscles में anaerobic respiration के दौरान lactic acid बनता है। इसलिए सही उत्तर option C 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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