set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

In cold countries, alcohol is preferred to mercury as a thermometric liquid because

a) Alcohol is a better conductor of heat

b) Alcohol is cheaper than mercury

c) Alcohol has a lower freezing point

d) The world production of alcohol is greater than that of mercury

Question : 2

Which of the following parts of eye protects the eye and gives it shape?

a) Yellow spot

b) Choroid

c) Sclera

d) Ciliary muscles

Question : 3

Red light is used in traffic signals because

a) It is visible to people even with bad eyesight

b) It is beautiful

c) It has the longest wavelength

d) None of the above

Question : 4

Which one of the following does a TV remote control unit use to operate a TV set?

a) Sound waves

b) Micro waves

c) Light waves

d) Radio waves

Question : 5

If you go on increasing the stretching force on a wire in a guitar, its frequency.

a) remains unchanged

b) increases

c) decreases

d) None of these

Question : 6

Consider the following statements for a simple harmonic motion:

1. The magnitude of the velocity of the body is proportional to its displacement from the mean position.
2. The magnitude of the acceleration of the body is proportional to its displacement from the mean position.
3. The sum of the kinetic energy and potential energy of the body is always constant.

a) 3 only

b) 1 and 3

c) 2 and 3

d) 2 only