All Free Everyday Science MCQs with Answers

1781. 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.

1782. 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.

1783. 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.

1784. 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.

1785. 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.

1786. 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.

1787. 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.

1788. The strongest part(s) of a magnet is/are _________?

• A. North pole
• B. South pole
• C. North and south pole
• D. Median of north and south pole

Explanation: A bar magnet is strongest at both of its poles, where the magnetic field lines are most concentrated. Neither pole alone is stronger than the other under ordinary conditions.

1789. Who discovered the Gamma Rays?

• A. Alfred Marshall
• B. Paul Villard
• C. Bohar
• D. Jabar bin Hayan

Explanation: French physicist Paul Villard discovered gamma rays in 1900 while studying radiation from radium. Rutherford later named this penetrating radiation gamma rays.

1790. The gravitational pull at the lunar surface is ________ of Earth?

• A. 1/3
• B. 1/4
• C. 1/5
• D. 1/6

Explanation: The Moon's surface gravity is about 1.62 m/s², compared with Earth's 9.81 m/s², making it approximately one-sixth of Earth's. This is why objects weigh much less on the Moon.