set 10 MCQ Questions & Answers Detailed Explanation

Question : 1

Rainbow is produced when Sunlight falls on drops of rain, which of the following physical phenomena are responsible for this?

1. Dispersion
2. Refraction
3. Internal reflection

a) 1 and 3

b) 2 and 3

c) 1 and 2

d) All of the above

Question : 2

Consider the following statements :

1. Fahrenheit is the smallest unit measuring temperature.
2. Fahrenheit was the first temperature scale used for measuring temperature.
3. The temperature at which Centigrade and Fahrenheit thermometers read the same is – 40°.

a) 2 and 3

b) 1 and 3

c) 1 and 2

d) 1, 2 and 3

Question : 3

In SONAR, we use

a) infrasonic waves

b) ultrasonic waves

c) radio waves

d) audible sound waves

Question : 4

Assertion (A) :
The boiling point of water decreases as the altitude increases.
Reason (R) :
The atmospheric pressure increases with altitude.

a) Both A and R are true but R is not a correct explanation of A

b) Both A and R are true and R is the correct explanation of A

c) A is true but R is false

d) A is false but R is true

Question : 5

Which one among the following statements is not correct?

a) In air or other gases, a progressive antinode occurs at a displacement node and a progressive node occurs at a displacement antinode

b) In progressive waves, the amplitude may be constant and neighbouring points are out of phase with each other

c) Transverse wave can be polarised while longitudinal wave cannot be polarised

d) Longitudinal wave can be polarised while transverse wave cnanot be polarized

Question : 6

The minimum height of mirror required to see whole stand up image of a man of height 1.50 metre shall be

a) 1.50 metre

b) 1.00 metre

c) 0.75 metre

d) 3.00 metre