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Class 10 Science – Assertion & Reason Questions CBSE PYQ based

 

Class 10 Science Assertion Reason Quiz | 50 Questions | StudyBeacon

Class 10 Science – Assertion & Reason Online Quiz (50 Questions)

Instructions:
Select the correct option and click Show Answer to reveal explanation.
Options:
A. Both A and R are true and R is the correct explanation
B. Both A and R are true but R is not the correct explanation
C. A is true but R is false
D. A is false but R is true

Q1.
Assertion: Mitochondria are called powerhouse of the cell.
Reason: They synthesize ATP during respiration.




Q2.
Assertion: Anaerobic respiration produces less energy.
Reason: Glucose is incompletely oxidized.




Q3.
Assertion: Alveoli increase efficiency of respiration.
Reason: They provide large surface area.




Q4.
Assertion: Reflex actions are quick responses.
Reason: They are controlled by the spinal cord.




Q5.
Assertion: Metals are good conductors of electricity.
Reason: They have free electrons.




Q6.
Assertion: Sodium is stored in kerosene.
Reason: It reacts violently with water.




Q7.
Assertion: Ethanol is a good fuel.
Reason: It burns with clean flame.




Q8.
Assertion: Resistance increases with length of conductor.
Reason: Longer path offers more opposition.




Q9.
Assertion: Fleming’s left-hand rule is used in motors.
Reason: It gives direction of force.




Q10.
Assertion: Energy transfer follows 10% law.
Reason: Most energy is lost as heat.




Q11.
Assertion: Fats provide more energy than carbohydrates.
Reason: Fats have higher calorific value.




Q12.
Assertion: Tendons connect muscles to bones.
Reason: Tendons are flexible elastic tissues.




Q13.
Assertion: Xylem transports water upward.
Reason: Transpiration pull helps in upward movement.




Q14.
Assertion: Rusting is a redox reaction.
Reason: Iron is oxidized during rusting.




Q15.
Assertion: pH of acid rain is less than 5.6.
Reason: Presence of SO₂ and NO₂ in atmosphere.




Q16.
Assertion: Esterification is reversible.
Reason: Ester reacts with base to form alcohol and salt.




Q17.
Assertion: Electric power is rate of consumption of energy.
Reason: Power = V × I.




Q18.
Assertion: Magnetic field lines never intersect.
Reason: Field has unique direction at every point.




Q19.
Assertion: Image formed by convex lens at infinity is at focus.
Reason: Parallel rays converge at focus.




Q20.
Assertion: Power of concave lens is negative.
Reason: It diverges light rays.




Q21.
Assertion: Dispersion occurs when white light passes through a prism.
Reason: Different colours travel with different speeds in glass.




Q22.
Assertion: Myopia is corrected using concave lens.
Reason: Concave lens diverges incoming rays.




Q23.
Assertion: Thermal power plants cause more pollution.
Reason: They burn fossil fuels.




Q24.
Assertion: Ozone layer protects life on Earth.
Reason: It absorbs ultraviolet radiation.




Q25.
Assertion: Food chains are usually short.
Reason: Energy decreases at each trophic level.




Q26.
Assertion: DNA carries genetic information.
Reason: DNA has specific base sequence.




Q27.
Assertion: Acquired traits are not inherited.
Reason: They do not alter genetic material.




Q28.
Assertion: Binary fission occurs in Amoeba.
Reason: It is a unicellular organism.




Q29.
Assertion: Ethanoic acid turns blue litmus red.
Reason: It produces H⁺ ions in solution.




Q30.
Assertion: Soaps are ineffective in hard water.
Reason: They form scum with Ca²⁺ and Mg²⁺ ions.




Q31.
Assertion: Electric fuse has low melting point.
Reason: It melts quickly during overload.




Q32.
Assertion: Magnetic field strength is maximum at poles.
Reason: Field lines are crowded at poles.




Q33.
Assertion: Image formed by plane mirror is virtual.
Reason: Reflected rays do not actually meet.




Q34.
Assertion: Convex mirror is used as rear-view mirror.
Reason: It gives wider field of view.




Q35.
Assertion: Nuclear energy releases huge energy.
Reason: Mass converts into energy.




Q36.
Assertion: Biodegradable waste decomposes naturally.
Reason: Microorganisms act on it.




Q37.
Assertion: Evolution leads to diversity of organisms.
Reason: Variations accumulate over generations.




Q38.
Assertion: Sexual reproduction produces variation.
Reason: It involves fusion of gametes.




Q39.
Assertion: Electrolysis is chemical change.
Reason: New substances are formed.




Q40.
Assertion: Non-metals are poor conductors.
Reason: They lack free electrons.




Q41.
Assertion: Detergents work in hard water.
Reason: They do not form scum.




Q42.
Assertion: Image distance is negative for real image.
Reason: Real image forms in front of mirror.




Q43.
Assertion: Resistance decreases with increase in temperature for metals.
Reason: Electron collisions increase.




Q44.
Assertion: Parallel combination gives less resistance.
Reason: Current has multiple paths.




Q45.
Assertion: Overloading causes fire.
Reason: Excess current heats wires.




Q46.
Assertion: Producers form first trophic level.
Reason: They synthesize food.




Q47.
Assertion: Hybridization produces new varieties.
Reason: Desirable traits combine.




Q48.
Assertion: Electroplating prevents corrosion.
Reason: Coating isolates metal from air and moisture.




Q49.
Assertion: Fossil fuels are non-renewable.
Reason: They take millions of years to form.




Q50.
Assertion: Sustainable development is necessary.
Reason: Resources are limited.




✔

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