ECAT Pre General Science Physics Chapter 21 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 21 Nuclear Physics

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ECAT Pre General Science Physics Chapter 21 Nuclear Physics

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Question # 1

1 amu is equal to

Question # 2

U-238 present in the natural uranium is about:

Question # 3

Nucleus consists of

Question # 4

If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be

Question # 5

Pair production take place when energy ofγ-rays photon is

Question # 6

Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:

Question # 7

The range ofβ-particle in air is greater than that ofα-particle by

Question # 8

The amount of energy equivalent to 1 a.m.u is

Question # 9

A curie represents a very strong source of

Question # 10

The figure 1.007276μ shows the mass of an:

Question # 11

How much time, theα-particle more massive than an electron

Question # 12

There is present in paraffin a large amount of:

Question # 13

Maric Curie and Pieree Curie discovered two new radioactive elements, which are called

Question # 14

The energy acquired by a mass of 1g moving with the speed of light is

Question # 15

Fraction of the decaying atoms per unit time is called

Question # 16

The half life of uranium-238 is

Question # 17

Radioactivity was discovered by:

Question # 18

For an atom having atomic number Z and atomic weight A, the charge on the nucleus is

Question # 19

When certain nucleus emits anα particle, its mass number:

Question # 20

Radioactivity was discovered by

Question # 21

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

Question # 22

A particle having the mass of electron and charge of a proton is called a

Question # 23

Which of these is not a radiation detector

Question # 24

Binding energy per nucleus is

Question # 25

Examples of moderators used in a fission reactor is/are:

Question # 26

The number of isotopes of hydrogen are

Question # 27

The reciprocal of decay constant λ of a radioactive material is:

Question # 28

The missing mass which is converted to energy in the formation of nucleus, is called

Question # 29

Three quarks make:

Question # 30

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 An alpha particle has a charge of
A. +2e
B. -2e
C. -e
D. +3e
2 The emission of radiations take place in elements, having charge number greater than
A. 109
B. 82
C. 69
D. 52
3 For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is
A. A - Z
B. A
C. Z
D. A + Z
4 Marie curie and Pierre curie discovered:
A. Uranium
B. Polonium
C. Radium
D. Both (A) and (C)
5 Alfa , beta and gamma rays are emitted from a radio-active substance
A. spontaneously
B. when it is heated
C. when it is exposed to light
D. When it interacts with the other particle
6 Rutherford performed an experiment on nuclear reactions in:
A. 1718 A.D
B. 1818 A.D
C. 1918 A.D
D. 2001 A.D.
7 A pair of quark and antiquark makes a:
A. Meson
B. Baryon
C. Proton
D. Neutron
8 If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by
A. -4
B. 4
C. 2
D. 1
9 The missing mass which is converted to energy in the formation of nucleus, is called
A. packing fraction
B. mass defect
C. binding energy
D. none of these
10 1 amu is equal to
A. 1.66 x 10-24kg
B. 1.66 x 10-19kg
C. 1.66 x 10-34kg
D. 1.66 x 10-27kg

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