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 : 6 [UPPCS (Mains) 2005]

Bats can fly during dark nights and also prey. This is because

a) Their night vision is very good

b) Every bird can do this

c) The pupil of their eyes is large

d) They produce ultrasonic waves and are guided by them

Discuss »

Answer: (d)

Question : 7 [UP (Pre) 2015]

The radius of curvatute of the plane mirror is

a) Infinity

b) One

c) Zero

d) Between one and infinity

Discuss »

Answer: (a)

Question : 8 [IAS (Pre) 2000]

A noise level of 100 decibel would correspond to

a) Ordinary conversation

b) Sound from a noisy street

c) Just audible sound

d) Noise from a machine shop

Discuss »

Answer: (d)

Question : 9

Total internal reflection can take place only if

a) the refractive indices of the two media are close to different

b) light goes from optically rarer medium (smaller refractive index) to optically denser medium

c) light goes from optically denser medium to rarer medium

d) the refractive indices of the two media are widely different

Discuss »

Answer: (c)

According to Snell’s Law

${sin i}/{sin r} = {µ_2}/{µ_1}$

where r = 90º for a particular incidence angle called the critical angle. When the incidence angle is equal to or greater than ic, then total internal reflection occurs.

It takes place when the ray of light travels from an optically denser medium (µ1 > µ2) to an optically rarer medium.

Question : 10

Consider the following statements:

  1. Steam at 100°C and boiling water at 100°C contain the same amount of heat.
  2. The latent heat of fusion of ice is equal to the latent heat of vaporization of water.
  3. In an air-conditioner, heat is extracted from the room air at the evaporator coils and is rejected out at the condenser coils.
Which of these statement(s) given above is/are correct?

a) 2 only

b) 2 and 3

c) 1 and 2

d) 3 only

Discuss »

Answer: (d)

Only statement 3 is correct.

An air conditioner (often referred to as AC) is a home appliance, system, or mechanism designed to dehumidify and extract heat from an area.

Steam (at 100 degrees Celsius) has more energy than water (at 100 degrees Celsius) because it takes energy to break the bonds that keep it liquid.

Latent heat is the heat released or absorbed by a chemical substance or a thermodynamic system during a change of state that occurs without a change in temperature.

The latent heat of fusion of water is 334 kJ/kg whereas the Latent heat of vaporization of water is 2260 kJ/kg.

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set 8 Online Quiz

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