Free Physics in Daily Life MCQs with Answers

191. The side view mirrors of vehicles are of which type of mirrors?

• A. Convex
• B. Concave
• C. Plane
• D. Inverted

Explanation: Convex mirrors provide a wide field of view and form upright, diminished images, allowing drivers to see more traffic behind them. Concave mirrors have a narrower field and can magnify nearby objects.

192. Farad is the unit of___________?

• A. inductance
• B. voltage
• C. capacitance
• D. None of these

Explanation: The farad measures capacitance, which is the ability of a component to store electric charge. Inductance is measured in henries, while voltage is measured in volts.

193. One Gross is equal to___________?

• A. 5 Dozen
• B. 10 Dozen
• C. 12 Dozen
• D. None of them

Explanation: A gross contains 144 items, and a dozen contains 12, so one gross equals 12 dozen. This is a counting unit rather than a measure of physical quantity such as mass or length.

194. Balloons are filled with _________ ?

• A. Nitrogen
• B. Helium
• C. Oxygen
• D. Argon

Explanation: Helium is used in balloons because it is less dense than air and is non-flammable. Hydrogen also provides lift, but its high flammability makes it unsafe for ordinary balloons.

195. In radiation, which of the following has strong photons?

• A. X-Rays
• B. Gamma
• C. Microwave
• D. Electromagnetic

Explanation: Gamma rays have the highest frequency and photon energy among the listed radiation types, so they are more penetrating than X-rays, microwaves and visible electromagnetic radiation. Photon energy increases with frequency.

196. Speed of sound in air is _______km/h?

• A. 1347
• B. 243
• C. 1235
• D. 1495

Explanation: Sound travels through air at about 343 metres per second at room temperature. Multiplying by 3.6 converts this to approximately 1,235 kilometres per hour.

197. A force applied on a body through the string is called_________?

• A. Weight
• B. Momentum
• C. Tension
• D. Torque

Explanation: The pulling force transmitted through a string, rope, or cable is called tension. Weight is gravitational force, while momentum describes motion and torque describes a turning effect.

198. Which of the following is solid?

• A. Water
• B. Stone
• C. Both
• D. None

Explanation: In the ordinary meaning used here, water is a liquid, whereas stone retains a definite shape and volume and is a solid. Water can become solid as ice, but that is not what the option normally denotes.

199. Gravitation force of earth is___________?

• A. 9.80 m/s²
• B. 7.21 m/s²
• C. 1.62 m/s²
• D. None of these

Explanation: The acceleration produced by Earth's gravity near its surface is about 9.8 m/s². Strictly speaking, this value is gravitational acceleration rather than a force, so the question uses “force” imprecisely.

200. The best conductor of heat among liquid is___________?

• A. Water
• B. Mercury
• C. Ether
• D. Alcohol

Explanation: Mercury conducts heat better than the other listed liquids and is also useful in thermometers because it expands predictably with temperature. Water, ether, and alcohol are poorer thermal conductors.