ECAT Pre General Science Physics Chapter 21 MCQ Test With Answer

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

Try The 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

How many isotopes of helium are present?

Question # 2

γ-rays are

Question # 3

Nuclei that have the same charge number but different mass number are called

Question # 4

The total charge of any nucleus is given as

Question # 5

Fraction of the decaying atoms per unit time is called

Question # 6

Marie curie and Pierre curie discovered:

Question # 7

The unit of decay constant is

Question # 8

Charge on proton is

Question # 9

Radioactivity is

Question # 10

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

Question # 11

The chemical properties of an element depends upon the number of

Question # 12

The counter, which also provides the power to the G.M. tube is called:

Question # 13

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

Question # 14

Beta particles are

Question # 15

The nucleus/nuclei of hydrogen is/are:

Question # 16

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

Question # 17

A pair of quark and antiquark makes a:

Question # 18

Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called

Question # 19

Neutron was discovered in

Question # 20

There is present in paraffin a large amount of:

Question # 21

The time required for a radioactive material to decrease in active by one half is called

Question # 22

Nucleus of a hydrogen atom may contain:

Question # 23

Neutrons are

Question # 24

When thorium nucleus emits aβ-particle, the daughter nucleus is called:

Question # 25

β-particles are easily deflected by collisions than heavy

Question # 26

Curie is a unit of

Question # 27

The rate of decay of a radioactive substance

Question # 28

Which of the following material has longer half life

Question # 29

Radioactivity was discovered by:

Question # 30

For Protium, the mass defect is:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The chemical behaviour of an atom is determined by
A. binding energy
B. atomic number
C. mass number
D. number of isotopes
2 Mass of neutron is
A. 1.67 x 10-31kg
B. 1.67 x 10-27kg
C. 9.1 x 10-31kg
D. 1.67 x 10-19kg
3 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
4 The range ofβ-particle in air is greater than that ofα-particle by
A. 1000 times
B. 100 times
C. 15 times
D. 10 times
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 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
7 The rate of decay of a radioactive substance
A. decrease exponentially with time
B. decreases linearly with time
C. increases linearly with time
D. increases exponentially with time
8 The figure 1.007276μ shows the mass of an:
A. Atom
B. Positron
C. Electron
D. Neutron
9 The penetration power ofβ-particle is
A. zero
B. less thanα-particle
C. equal toα-particle
D. greater thanα-particle
10 Marie curie and Pierre curie discovered:
A. Uranium
B. Polonium
C. Radium
D. Both (A) and (C)

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