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Science Quick Kit: 18 MCQs with answers

All 18 multiple-choice questions from this kit, free and with no sign-up.

Full kit · everything Flashcards · 18 Quick Revision · 18

Warm-up · 11 questions

Q1. Which of the following is a combination reaction?

Beginner
A Zn + CuSO₄ → ZnSO₄ + Cu B CaCO₃ → CaO + CO₂ C AgNO₃ + NaCl → AgCl + NaNO₃ D 2Mg + O₂ → 2MgO
Show answer & explanation

2Mg + O₂ → 2MgO

In a combination reaction, two or more reactants combine to form a single product. 2Mg + O₂ → 2MgO fits this definition.

Q2. When iron nails are placed in copper sulphate solution, the colour of the solution changes from blue to:

Beginner
A Colourless B Green C Red D Yellow
Show answer & explanation

Green

Iron displaces copper from copper sulphate, forming ferrous sulphate which is green in colour.

Q3. Which gas is evolved when sodium hydrogen carbonate reacts with dilute hydrochloric acid?

Beginner
A Hydrogen B Chlorine C Oxygen D Carbon dioxide
Show answer & explanation

Carbon dioxide

NaHCO₃ + HCl → NaCl + H₂O + CO₂, so carbon dioxide gas is evolved.

Q4. The pH of a solution is 5. This solution is:

Beginner
A Neutral B Amphoteric C Acidic D Basic
Show answer & explanation

Acidic

pH less than 7 indicates an acidic solution.

Q5. Which of the following is a strong acid?

Beginner
A Hydrochloric acid B Carbonic acid C Acetic acid D Citric acid
Show answer & explanation

Hydrochloric acid

HCl ionizes completely in water, making it a strong acid, while the others are weak acids.

Q6. Which part of the human brain controls voluntary actions?

Beginner
A Medulla B Pons C Cerebrum D Cerebellum
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Cerebrum

The cerebrum is responsible for voluntary actions, thinking, and memory.

Q7. The magnification produced by a plane mirror is:

Beginner
A 2 B 0 C Infinite D 1
Show answer & explanation

1

A plane mirror forms an image of the same size as the object, so magnification is 1.

Q8. The phenomenon of splitting of white light into its constituent colours is called:

Beginner
A Refraction B Dispersion C Scattering D Reflection
Show answer & explanation

Dispersion

Dispersion is the splitting of white light into its component colours, as seen in a prism.

Q9. The defect of vision in which a person cannot see distant objects clearly is:

Beginner
A Presbyopia B Myopia C Cataract D Hypermetropia
Show answer & explanation

Myopia

Myopia (nearsightedness) is the inability to see distant objects clearly; it is corrected with a concave lens.

Q10. A neutralization reaction between an acid and a base always produces salt and water.

Beginner
A True B False
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True

Acid + Base → Salt + Water is the general neutralization reaction.

Q11. The image formed by a convex mirror is always real and inverted.

Beginner
A True B False
Show answer & explanation

False

A convex mirror always forms a virtual, erect, and diminished image.

Building up · 7 questions

Q12. In the reaction: Pb(NO₃)₂(aq) + 2KI(aq) → PbI₂(s) + 2KNO₃(aq), the yellow precipitate formed is:

Intermediate
A Lead nitrate B Lead iodide C Potassium nitrate D Potassium iodide
Show answer & explanation

Lead iodide

Lead iodide (PbI₂) is insoluble in water and forms a yellow precipitate, as per NCERT Chapter 1.

Q13. The process of breakdown of glucose in the absence of oxygen is called:

Intermediate
A Transpiration B Anaerobic respiration C Aerobic respiration D Photosynthesis
Show answer & explanation

Anaerobic respiration

Anaerobic respiration occurs without oxygen, producing ethanol and carbon dioxide in yeast or lactic acid in muscles.

Q14. In human beings, the breakdown of glucose in the mitochondria yields:

Intermediate
A Oxygen B Carbon dioxide and water C Ethanol D Lactic acid
Show answer & explanation

Carbon dioxide and water

In mitochondria, aerobic respiration breaks down pyruvate into carbon dioxide and water, releasing energy.

Q15. The growth of a pollen tube towards the ovule is an example of:

Intermediate
A Hydrotropism B Chemotropism C Geotropism D Phototropism
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Chemotropism

Chemotropism is the growth movement in response to chemicals. The pollen tube grows towards chemicals released by the ovule.

Q16. The focal length of a concave mirror is 10 cm. Its radius of curvature is:

Intermediate
A 40 cm B 20 cm C 10 cm D 5 cm
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20 cm

Radius of curvature (R) = 2 × focal length (f) = 2 × 10 = 20 cm.

Q17. The colour of the sky appears blue due to:

Intermediate
A Scattering of light B Dispersion of light C Reflection of light D Refraction of light
Show answer & explanation

Scattering of light

Blue light is scattered more than other colours by atmospheric particles, making the sky appear blue.

Q18. Which of the following is NOT a reflex action?

Intermediate
A Riding a bicycle B Blinking of eyes C Withdrawal of hand on touching hot object D Knee jerk
Show answer & explanation

Riding a bicycle

Riding a bicycle is a learned voluntary action, not a reflex action. Reflex actions are involuntary and automatic.

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