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]

set 1

set 2

set 3

set 4

set 5

set 6

set 7

set 8

set 9

set 10

set 11

set 12

set 13

set 14

set 15

set 16

Question : 26

The wavelength of radiation emitted by a body depends upon

a) the temperature of its surface

b) the nature of its surface

c) the area of its surface

d) All of the above

Answer: (d)

Question : 27 [IAS (Pre) 1995]

The normal temperature of human body is 98.4°F. It’s equivalent temperature (in °C) is

a) 36.89

b) 35.72

c) 40.16

d) 32.36

Answer: (a)

Question : 28

Match List I with List II and select the correct answer using the codes given below the lists:

List I List II
A. The coefficient of volume expansion at constant pressure 1. Decrease in pressure
B. At constant temperature, an increase in volume results in 2. At all temperature
C. An ideal gas obeys Boyle’s and Charle’s law 3. Same for all gases
D. A real gas behaves as an ideal gas at low pressure 4. At high temperature
Choose the correct option from the codes given below :

a) A – 3, B – 1, C – 2, D – 4

b) A – 2, B – 3, C – 4, D – 1

c) A – 2, B – 1, C – 3, D – 4

d) A – 3, B – 4, C – 1, D – 2

Answer: (a)

(A) → 3 C= $1/{273}$ °C same for all gases

(B) → 1 PV = cos A ⇒ P ∝ $1/V$

(C) → 2 Ideal gas obeys gas law at each range of temperature.

(D) → 4 At high temperature, intermolecular forces become zero and so real gas behaves like an ideal gas.

Question : 29

Which of the following statements is/ are false about mode of heat transfer?

  1. In radiation, heat is transfered from one medium to another without affecting the intervening medium
  2. Radiation and convection are possible in vaccum while conduction requires material medium.
  3. Conduction is possible in solids while convection occurs in liquids and gases.

a) II only

b) I only

c) II and III

d) I, II and III

Answer: (a)

Question : 30 [UPPCS (Pre) 2003]

In the season of summer, we experience a humid heat when weather

a) Middle of summer

b) Scorching weather

c) Start of summer

d) Humid weather

Answer: (d)

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