# Modern And Space Physics, Sources Of Energy - Category Wise Question And Answer Practice Test With Solutions

#### MODERN AND SPACE PHYSICS, SOURCES OF ENERGY PRACTICE TEST [3 - EXERCISES]

Question : 1 [SSC]

Audio signal cannot be transmitted because

a) the signal cannot be amplified for distance communication

b) the transmitting antenna length is very small to design

c) the signal has more noise

d) the transmitting antenna length is very large and impracticable

Question : 2

Match List-I with List-II and select the correct answer using the code given below the lists.

 List I List II A. Photons 1. The minimum energy for emission of electron B. Nucleons 2. Heavy water C. Work function 3. Packet of energy D. Coolant 4. Neutrons and Protons
Select the correct answer using the codes given below the lists:

a) A – 4 ; B – 2 ; C – 3 ; D – 1

b) A – 2 ; B – 1 ; C – 4 ; D – 3

c) A – 3 ; B – 4 ; C – 1 ; D – 2

d) A – 2 ; B – 4 ; C – 1 ; D – 3

A → 3; B → 4; C → 1; D → 2

1. Photon is a packet of energy emitted from a source of radiations.
2. Nucleons are consist of neutrons and protons.
3. The minimum energy required to liberate the electrons from the metal surface, is called work function.

Question : 3

Geothermal energy is

a) energy stored as heat in the earth

b) amount of energy obtained from coal and petroleum inside earth crust.

c) energy of magma inside the earth crust

d) amount of minerals obtained from earth crust

Question : 4 [CDS]

The most familiar form of radiant energy in sunlight that causes tanning and sunburning of human skin, is called

Question : 5

In the photoelectric effect, electrons are emitted:

a) With a maximum velocity proportional to the frequency of the incident radiation.

b) At a rate that is independent of the emitter.

c) At a rate that is proportional to the amplitude of the incident radiation.

d) Only if the frequency of the incident radiations is above a certain threshold value.