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

In his experiment on nuclear reactions, Rutherford bombardedα particles on:

Question # 2

The number if neutrons in the nucleus of 92U235are

Question # 3

The half life of uranium-238 is

Question # 4

The diameter of an atom is of the order

Question # 5

U-238 present in the natural uranium is about:

Question # 6

The half life of radioactive substances depends upon

Question # 7

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

Question # 8

Fraction of the decaying atoms per unit time is called

Question # 9

When certain nucleus emits anα particle, its mass number:

Question # 10

An alpha particle has a charge of

Question # 11

The rate of decay of a radioactive substance

Question # 12

Radium was discovered by:

Question # 13

γ-rays behave like a particle because they explain the

Question # 14

The number of isotopes of hydrogen are

Question # 15

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 During the nuclear changes, the law/s of conservation that hold/s are that of:
A. Charge
B. energy
C. Momentum
D. Mass
2 In radioactive decay, the new element which is formed due to the disintegration of original element is called
A. element
B. daughter element
C. parent element
D. none of these
3 Phenomenon of radioactivity is due to disintegration of
A. nucleus
B. neutron
C. proton
D. molecule
4 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
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 range ofβ-particle in air is greater than that ofα-particle by
A. 1000 times
B. 100 times
C. 15 times
D. 10 times
7 Rate of decay is actually described by.
A. Half line
B. Decay constant
C. Mean life
D. Total life
8 Nucleus consists of
A. proton and neutron
B. protons and electron
C. electron and neutron
D. protons only
9 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
10 The number of isotopes of hydrogen are
A. 2
B. 1
C. 3
D. 4

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