Free Physics in Daily Life MCQs with Answers

51. The instrument which measures very high temperature is____________?

• A. Manometer
• B. Thermostat
• C. Chronometer
• D. Pyrometer

Explanation: A pyrometer measures very high temperatures without requiring direct contact, often by detecting thermal radiation. A manometer measures pressure, whereas a thermostat controls temperature rather than measuring extreme heat.

52. Dr. Abdus Salam of Pakistan was one of the contributors of the unification of __________?

• A. Electromagnetic force and gravitational force
• B. Electromagnetic force and weak nuclear force
• C. Gravitational force and weak nuclear force
• D. Weak nuclear force and strong nuclear force
• E. None of these

Explanation: Abdus Salam shared the Nobel Prize for work leading to the electroweak theory, which unifies the electromagnetic and weak nuclear forces. Gravity and the strong force are not part of this established unification.

53. Max Planck received the noble prize in Physics in 1918 for his discovery of ?

• A. electron
• B. energy quanta
• C. photon
• D. positron

Explanation: Planck introduced the idea that energy is emitted or absorbed in discrete packets called quanta, forming the basis of quantum theory. The photon was later associated specifically with light quanta.

54. 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.

55. 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.

56. 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.

57. 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.

58. 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.

59. 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.

60. 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.