set 10 MCQ Questions & Answers Detailed Explanation

Question : 1

A sonometer wire having a length of 50 cm is vibrating in the fundamental mode with a frequency of 100Hz. Which of the following is the type of propagating wave and its speed?

a) Transverse, 50 m/s

b) Longitudinal, 50 m/s

c) Longitudinal, 100 m/s

d) Transverse, 100 m/s

Question : 2

Twinkling of stars is on account of

a) large size of stars

b) large distance of stars and storms in air

c) small size of stars

d) large distance of stars and fluctuations in the density of air

Question : 3

The temperature of a room is 77°F. What would it be on the Celsius scale?

a) 60°C

b) 25°C

c) 45°C

d) 350°C

Question : 4

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 : 5

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 : 6

What is the reason behind the extraordinary shining of the diamond cuts in a proper way?

a) Because it is so hard

b) Because it has a higher refractive index

c) Because it has a higher transparency

d) Because it has a fixed deviation floors