modern and space physics, sources of energy - Category wise Question and Answer Practice Test with Solutions

Question : 11

In a hydro power plant

a) kinetic energy possessed by stored water is converted into potential energy

b) electricity is extracted from water

c) potential energy possessed by stored water is converted into electricity

d) water is converted into steam to produce electricity

Question : 12

Consider the following statements :

1. Collation is a process of sorting at receiving end
2. Encoding of signal is required for modulation at transmitting end
3. Long wave broadcast transmitter are used for temperate countries

a) 2 and 3

b) 1 and 3

c) 1 and 2

d) 1, 2 and 3

Question : 13

Match the List I and List II.

a) A – 4 ; B – 2 ; C – 1 ; D – 3

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

Question : 14

Which of the following statement is/are the applications of photovoltaic cells?

1. They are used to detect opacity of solids, defects in materials.
2. They are used to switch on and off the street lights automatically
3. They are used to compare illuminating power of two sources.
4. To control temperature in furnaces and chemical reactions

a) B, C, D

b) A, B, C

c) B and C

d) All of these

Question : 15

Chadwick was awarded the 1935 nobel prize in physics for his discovery of the

a) proton

b) neutron

c) electron

d) positron