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

Question : 1

Which of the following does NOT allow harmful ultraviolet radiations from the sun to reach the earth?

a) NO₂

b) CO₂  

c) O₂  

d) O₃  

Question : 2

Television signals are

a) amplitude modulated

b) both frequency and amplitude modulated

c) frequency modulated

d) phase modulated

Question : 3 [NDA]

If an a-particle is projected normally through a uniform magnetic field, then the path of the a-particle inside the field will be

a) parabolic

b) elliptical

c) circular

d) a straight line

Question : 4

Consider the following statements: In a nuclear reactor, self-sustained chain reaction is possible, because:

1. More neutrons are released in each of the fission reactions.
2. The neutrons immediately take part in the fission process.
3. The fast neutrons are slowed down by graphite.
4. Every neutron released in the fission reaction initiates further fission.

a) 1 and 3

b) 2 and 4

c) 1, 2 and 3

d) 2, 3 and 4

Question : 5

The number of atoms per unit cell in a sc, bcc and fcc system are:

a) 8, 6 and 10 respectively

b) 1, 4 and 2 respectively

c) 1, 2 and 4 respectively

d) 2, 4 and 1 respectively