Free Physics in Daily Life MCQs with Answers

301. The melting point of ice is_________?

• A. 00C
• B. 1000C
• C. 40C
• D. -40C

Explanation: At standard atmospheric pressure, ice melts at 0°C, the point at which solid and liquid water coexist. The value can vary slightly with pressure and impurities.

302. Density of Ice is_________?

• A. 800kg/m3
• B. 917kg/m3
• C. 930kg/m3
• D. 1000kg/m3Biological Sciences

Explanation: Ice has a density of about 917 kg/m³, which is less than liquid water's roughly 1000 kg/m³. This lower density is why ice floats.

303. The Mirror used in the Automobiles are___________?

• A. Concave
• B. Convex
• C. Plains
• D. Reflective

Explanation: Automobile rear-view and side-view mirrors are convex, so they provide a wider field of view. They form upright, diminished images, helping drivers see more traffic behind them.

304. The Scientist who told "Heat is a form of Energy" was___________?

• A. Thomas Alva Edison
• B. Newton
• C. Joule
• D. Kepler

Explanation: James Prescott Joule established the mechanical equivalent of heat, showing that heat is a form of energy. The SI unit of energy, the joule, is named after him.

305. One Quintal is Equal to___________?

• A. 70 kg
• B. 80 kg
• C. 90 kg
• D. 100 kg

Explanation: A quintal is a metric unit of mass equal to 100 kilograms. It is commonly used for measuring agricultural produce.

306. In Space, our Body_______?

• A. Gains Weight
• B. Loses Weight
• C. No Change
• D. Little Change

Explanation: In orbit, a body still has mass but experiences apparent weightlessness because it and its surroundings are continuously falling under gravity. Basic textbooks therefore describe the body as losing its weight.

307. Microphone converts sound energy into ___________?

• A. Microwaves
• B. Electrical signals
• C. Optical Signals
• D. Heat energy

Explanation: A microphone uses a diaphragm to convert sound vibrations into corresponding electrical signals. A loudspeaker performs the reverse process by converting electrical signals into sound.

308. 1 BTU(British thermal unit) is equal to___________?

• A. 955 joules
• B. 990 joules
• C. 1055 joules
• D. 1211 joules

Explanation: One British thermal unit is approximately 1,055 joules, representing the heat needed to raise one pound of water by one degree Fahrenheit. Therefore 1055 joules is the standard rounded value.

309. Which of the following Rays are more Penetrating?

• A. Beta rays
• B. Alpha rays
• C. Gamma rays
• D. X-rays

Explanation: Gamma rays are generally the most penetrating among the listed nuclear radiations because they have no charge and interact less readily with matter. Alpha particles are stopped by paper, while beta particles require thin metal shielding.

310. A loudspeaker changes _________ energy into sound energy.

• A. Chemical
• B. Electrical
• C. Light
• D. Kinetic

Explanation: A loudspeaker uses electrical energy to drive a coil and cone, producing vibrations in the air that we hear as sound. It does not directly convert chemical, light, or kinetic energy in normal operation.