ECAT Pre Computer Science Chapter 21 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 21 Nuclear Physics

Try The MCQ's Test For ECAT Physics Chapter 21 Nuclear Physics

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ECAT Physics Chapter 21 Nuclear Physics

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Question # 1

The unit of decay constant is:

Question # 2

The half life of radioactive substances depends upon

Question # 3

Curie is a unit of

Question # 4

U-238 present in the natural uranium is about:

Question # 5

γ-rays are

Question # 6

An alpha particle has a charge of

Question # 7

When a nucleus emits an alpha particle, it atomic mass decreased by

Question # 8

Fraction of the decaying atoms per unit time is called

Question # 9

In radioactive decay, the new element which is formed due to the disintegration of original element is called

Question # 10

When certain nucleus emits aβ-particles, is mass number:

Question # 11

For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is

Question # 12

In radio-active decay, the original element which disintegrate to another element is called

Question # 13

Nucleus consists of

Question # 14

If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by

Question # 15

For Protium, the mass defect is:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The counter, which also provides the power to the G.M. tube is called:
A. Thin mica window
B. thin glass window
C. Airy window
D. Wooden window
2 Examples of moderators used in a fission reactor is/are:
A. Water
B. Heavy water
C. Carbon
D. Hydrocarbon
3 Three quarks make:
A. An electron
B. A meson
C. A baryon
D. A photon
4 The number of isotopes of hydrogen are
A. 2
B. 1
C. 3
D. 4
5 According to Rutherford atomic model, the positive charge in an atom
A. is concentrated at its centre
B. is in the form of positive electron at same distance from its centre
C. is spread uniformly through its volume
D. none of these
6 Pair production take place when energy ofγ-rays photon is
A. equal to 1.02 Mev-
B. greater than 1.02 Mev
C. less than 1.02 Mev
D. none of these
7 The half lie of radium-226 is
A. 238 years
B. 4.5 x 109days
C. 1620 years
D. 332 years
8 Curie is a unit of
A. reluctance
B. resistivity
C. binding energy
D. radioactivity
9 A mass difference of 0.0012 u is equivalent to and energy of:
A. 0.5 Me V
B. 1.13 MeV
C. 5.13 MeV
D. 1.13 keV
10 The rate of decay of radioactive substance
A. is constant
B. decrease exponentially with time
C. varies inversely as time
D. decreases linearly with time

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