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

In wilson cloud chamber, the air becomes saturated with:

Question # 2

Mass of proton is of order of

Question # 3

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

Question # 4

Neutron was discovered by

Question # 5

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

Question # 6

Phenomenon of radioactivity is due to disintegration of

Question # 7

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

Question # 8

Binding energy per nucleus is

Question # 9

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

Question # 10

An alpha particle has a charge of

Question # 11

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

Question # 12

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

Question # 13

When a charged particle passes through matter, it produces ionization, this effect is used in

Question # 14

Beta particles are

Question # 15

Radioactivity is

Question # 16

1 amu is equal to.

Question # 17

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

Question # 18

Neon gas have three isotopes whose atomic numbers are

Question # 19

For Protium, the mass defect is:

Question # 20

1 amu is equal to

Question # 21

For an atom having atomic number Z and atomic weight A, the number of electron in an atoms

Question # 22

Mass of neutron is

Question # 23

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

Question # 24

Fraction of the decaying atoms per unit time is called

Question # 25

The unit of decay constant is:

Question # 26

Radioactivity was discovered by:

Question # 27

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

Question # 28

When certain nucleus emits anα particle, its mass number:

Question # 29

Heavy water is made of one oxygen atom and two atoms of:

Question # 30

Curie is a unit of

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 For an atom having atomic number Z and atomic weight A, the number of electron in an atoms
A. A - Z
B. A + Z
C. Z
D. A
2 The number of all the protons and neutrons in a nucleus is known as
A. atomic number
B. mass number
C. charge number
D. none of these
3 The distance travelled byα-particle in a medium before coming to rest, is called
A. range ofγ-particle
B. range of neutrons
C. range of particle
D. none of these
4 Charge on proton is
A. 1.59 x 10-9C
B. 1.59 x 10-7C
C. -1.59 x 10-19 C
D. 1.59 x 10-19C
5 The half lie of radium-226 is
A. 238 years
B. 4.5 x 109days
C. 1620 years
D. 332 years
6 The nuclei of an element having the same charge number but different mass numbers are called:
A. Isobars
B. Isotopes
C. Isomers
D. Isobaric
7 The amount of energy equivalent to 1 a.m.u is
A. 9.315 Mev
B. 93.15 Mev
C. 931.5 Mev
D. 2.22 Mev
8 The unit of decay constant is:
A. Second
B. Metre
C. Hour
D. Year
9 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
10 The unit of decay constant is
A. sex
B. sec2
C. sec-1
D. sec-2

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