Free Physics in Daily Life MCQs with Answers

331. Sunlight is composed of___________?

• A. Three colours
• B. six colours
• C. seven colours
• D. eight colours

Explanation: Visible sunlight is traditionally described as seven colours: red, orange, yellow, green, blue, indigo and violet. A prism separates these colours because each wavelength bends by a different amount.

332. At what angle above the horizon must the sun be to create a rainbow?

• A. 90 degrees
• B. 60 degrees
• C. 40 degrees
• D. 65 degrees

Explanation: A primary rainbow is normally visible when the Sun is below about 42 degrees above the horizon, making 40 degrees the closest option. At higher solar angles, the rainbow is difficult or impossible to see from level ground.

333. Short-sight defect could be corrected by a _____________ lens?

• A. concave lens
• B. convex lens
• C. converging lens
• D. none of these

Explanation: Myopia makes distant objects focus in front of the retina, so a concave lens spreads incoming rays and shifts the focus back onto the retina. A convex lens is used for long-sightedness.

334. Sound cannot travel through __________

• A. Solid
• B. Liquid
• C. Gases
• D. Vaccum

Explanation: Sound is a mechanical wave and needs particles of a medium to transmit vibrations, so it can travel through solids, liquids, and gases. A vacuum has no particles to carry the sound wave.

335. The speed of sound in air at sea level is approximately____________?

• A. 300 meter per second
• B. 320 meter per second
• C. 340 meters per second
• D. 370 meter per second

Explanation: At sea level and around 20°C, sound travels through air at approximately 343 metres per second, conventionally rounded to 340 metres per second. Its speed changes with temperature and the medium.

336. The energy stored in a dam is___________?

• A. Kinetic energy
• B. Electrical energy
• C. Potential energy
• D. None of these

Explanation: Water stored behind a dam has gravitational potential energy because it is held at a height. When released, this energy changes into kinetic energy and can drive turbines.

337. Electron was discovered by?

• A. Michael Faraday
• B. James Maxwell
• C. Yuri Gagarin
• D. J.J Thomson

Explanation: J. J. Thomson identified the electron in 1897 through experiments with cathode rays. Faraday and Maxwell made major contributions to electricity and electromagnetism but did not discover the electron.

338. 2017 Nobel Prize Currently Awarded in Physics is for_________________?

• A. Far Observation of Gravitational Waves
• B. Far Observation of Gravitational Weight
• C. First Observation of Gravitational Waves
• D. Far Objectivity of Gravitational Waves

Explanation: The 2017 Nobel Prize in Physics recognized the LIGO detector and the first observation of gravitational waves. Gravitational weight is not the phenomenon involved, and the other phrases are malformed.

339. The speed of light is __________?

• A. 280,000 km/s
• B. 300,000 km/s
• C. 320,000 km/s
• D. none of these

Explanation: Light travels in vacuum at approximately 300,000 km/s, or 3.0 × 10⁸ m/s. Its speed is slightly lower in air and substantially lower in materials such as glass or water.

340. SI unit of time is_________?

• A. second
• B. kilo gram
• C. meter
• D. volt

Explanation: The second is the SI base unit of time. Kilogram measures mass, metre measures length, and volt measures electric potential difference.