Free Physics in Daily Life MCQs with Answers

11. When water is filled in a bottle and is allowed to freeze, the bottle breaks because

• A. Water expands on freezing
• B. Bottle contracts at freezing point
• C. temperature outside the bottle is less than that inside the bottle.
• D. None of the above

Explanation: Water expands when it freezes because its molecules form an open crystal structure, increasing its volume. The expansion exerts pressure on a rigid bottle until the bottle cracks or breaks.

12. A tight-rope walker carries a long pole which he holds across his body. The purpose of this pole is to__________?

• A. Prop him up if he falls
• B. Spread out his weight and reduce the pressure on the rope
• C. Add extra weight to keep the rope tightly stretched
• D. To keep the Center of gravity always above vertically above the rope

Explanation: The long pole helps the walker control balance by keeping the combined centre of gravity vertically above the rope. It also increases rotational inertia, giving more time to correct a tilt.

13. The Beta particles are fast moving___________?

• A. Protons
• B. Electrons
• C. Neutrons
• D. None

Explanation: Beta-minus particles are fast-moving electrons emitted when a neutron changes into a proton. They are therefore different from alpha particles, which are helium nuclei.

14. The alpha particles are compact clusters of______________?

• A. Electron and Proton
• B. Two Protons and two Neutrons
• C. Three protons and three Neutrons
• D. None

Explanation: An alpha particle is the nucleus of a helium-4 atom, containing two protons and two neutrons. It has no electrons, so the first option describes a different combination.

15. One of these scientists formulated basic laws of Geometry?

• A. Pythagorus
• B. Archimedes
• C. Aristotle
• D. None

Explanation: Pythagoras is traditionally associated with the Pythagorean theorem, a foundational result in geometry relating the sides of a right triangle. Aristotle is primarily associated with philosophy and logic, not the basic laws of geometry.

16. Coulomb is the scientific unit to measure?

• A. Velocity
• B. Temperature
• C. Mass
• D. None OF These

Explanation: The coulomb is the SI unit of electric charge, equal to the charge transferred by one ampere in one second. None of the listed quantities is measured in coulombs.

17. For being able to see three-dimensional pictures we have to use_________?

• A. A binocular
• B. A camera
• C. An epidiascope
• D. A stereoscope

Explanation: A stereoscope presents slightly different views to the two eyes, allowing the brain to combine them into a three-dimensional image. A binocular is mainly for viewing distant objects, not specially designed 3-D pictures.

18. Materials for rain-proof coats and tents owe their water proof properties to________?

• A. Surface tension
• B. Viscosity
• C. Specific gravity
• D. Elasticity

Explanation: Surface tension makes water form droplets and resist spreading across the fibres of a treated coat or tent. Viscosity and specific gravity describe fluid behaviour and density, not waterproofing.

19. The absorption of ink by blotting paper involves__________?

• A. Viscosity of ink
• B. Capillary action phenomenon
• C. Diffusion of ink through the blotting
• D. Siphon action

Explanation: Blotting paper contains very fine pores, and adhesion plus capillary action draws the ink into these narrow spaces. Siphon action requires a connected liquid column and is not involved here.

20. Detergents dissolved in water help in cleaning clothes by_________?

• A. Increasing the temperature of water
• B. Reacting chemically with dirt
• C. Reducing the surface tension of water
• D. Dissolving dirt

Explanation: Detergents lower water's surface tension, allowing it to spread through cloth and reach dirt more easily. They also help suspend grease, but the characteristic physical action tested here is reduced surface tension.