All Free Everyday Science MCQs with Answers

1531. Clocks, which moves with the velocities comparable with the velocity of light, run ?

• A. fast
• B. slow
• C. equal to the velocity of light
• D. with zero velocity

Explanation: According to special relativity, a moving clock runs slower relative to a stationary observer, an effect called time dilation. The effect becomes significant when the speed approaches that of light.

1532. Copper can be converted into gold by ?

• A. Artificial radioactivity
• B. heating
• C. Electroplating
• D. Chemical reaction

Explanation: Copper can be changed into gold only by nuclear transmutation, in which the atomic nucleus is altered, not by heating or an ordinary chemical reaction. Artificial nuclear reactions are therefore the closest listed option.

1533. Freezing point of water is__________?

• A. 0°C
• B. -2°C
• C. -4°C
• D. None of above

Explanation: Pure water freezes at 0°C under standard atmospheric pressure. Dissolved substances or changes in pressure can slightly alter this value, but the standard answer is 0°C.

1534. The SI unit of Heat is________?

• A. Watt
• B. Volt
• C. Joule
• D. Newton

Explanation: Heat is a form of energy, and the SI unit of energy is the joule. Watt measures power, volt measures potential difference and newton measures force.

1535. The SI unit of electric current is?

• A. Coloumb
• B. Ampere
• C. Volt
• D. Watt

Explanation: The ampere is the SI base unit of electric current. The coulomb measures electric charge, the volt potential difference and the watt power.

1536. Einstein's famous equation which states that mass and energy are interchangeable is?

• A. E = mc2
• B. E = cm2
• C. M = ec2
• D. M = ce2

Explanation: Einstein’s mass-energy relation is E = mc², where c is the speed of light. Because c² is very large, even a small amount of mass corresponds to enormous energy.

1537. Sound waves are _________ waves.

• A. Transverse
• B. Electromagnetic
• C. Longitudinal
• D. None of these

Explanation: Sound in air travels as a longitudinal wave, producing successive compressions and rarefactions in the medium. It is not electromagnetic and therefore requires a material medium to travel.

1538. Instrument used for measuring very high temperature is __________?

• A. Pyroscope
• B. Pyrometer
• C. Seismograph
• D. Xylometer

Explanation: A pyrometer measures very high temperatures, often without touching the hot object by detecting its emitted radiation. A seismograph records earthquakes, while a xylometer measures the volume of wood.

1539. 1 nanometer = ?

• A. 10-3 meter
• B. 10-6 meter
• C. 10-9 meter
• D. 10-12 meter

Explanation: The prefix nano means one-billionth, or 10⁻⁹, of a unit. Thus, one nanometre equals 10⁻⁹ metre.

1540. When white light is passed through a prism, it splits into __________ colours.

• A. 5
• B. 6
• C. 7
• D. 8

Explanation: A prism disperses white light into the seven visible spectral colours, commonly remembered as VIBGYOR: violet, indigo, blue, green, yellow, orange and red.