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]

Question : 1

Consider the following statements:

1. Speed of wave = $\text"wave length"/\text"time period"$.
2. Wavelength is the distance between two nearest particles in phase.
3. The flash of lightening is seen before the sound of thunder is heard.
4. Speed of sound is greater than speed of light.
Which of the statements given above are correct?

a) 1, 2 and 3

b) 1 and 2

c) 2 and 3

d) 1, 2, 3 and 4

Speed of sound at NTP = 332 m/s,

whereas speed of light is 3 × 108

Question : 2 [UPPCS (Pre) 1993]

The hand burns more by steam comparatively to boiling water, because

a) Steam sneaked into the body

b) The steam has more power

c) The steam has latent heat

d) Steam is gig

Question : 3 [UPPCS (Pre) 2015]

The number of images of an object placed between two parallel mirrors is

a) Six

b) One

c) Two

d) Infinite

Question : 4 [UPPCS (Pre) 2014]

Sound waves do not travel in

a) Liquids

b) Gases

c) Solids

d) Vacuum

Question : 5 [IAS (Pre) 1999]

Strips of two metals A and B are firmly jointed together as shown in the figure. On heating, A expands more than B does. If this jointed strip is heated, then it will appear as

a)

b)

c)

d)

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