set 8 MCQ Questions & Answers Detailed Explanation

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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq

Questions : 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

The correct answers to the above question in:

Answer: (a)

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Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers

Question : 1

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)

Question : 2

Sound moves with higher velocity if

a) temperature of the medium is increased

b) pressure of the medium is decreased

c) humidity of the medium is increased

d) Both (a) and (c) above

Answer: (d)

Question : 3

What is the purpose of ‘evolved Laser Interferometer Space Antenna (eLISA)’ project?

a) To detect gravitational waves

b) To detect the effectiveness of missile defence system

c) To detect neutrinos

d) To study the effect of solar flares on our communication systems

Answer: (a)

Question : 4

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 Cv = $1/{273}$ °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 : 5

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 : 6

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)

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