light, heat, thermodynamics, wave motion, sound, optics & oscillations - Category wise Question and Answer Practice Test with Solutions

light, heat, thermodynamics, wave motion, sound, optics & oscillations PRACTICE TEST [16 - EXERCISES]

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set 16

Question : 16

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°.
Which of the statements are correct?

a) 2 and 3

b) 1 and 3

c) 1 and 2

d) 1, 2 and 3

Answer: (b)

Reamer was the first temperature scale.

Question : 17 [CDS]

In SONAR, we use

a) infrasonic waves

b) ultrasonic waves

c) radio waves

d) audible sound waves

Answer: (b)

Question : 18 [NDA]

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

Answer: (d)

Question : 19

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

Answer: (d)

Question : 20

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

Answer: (b)

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