ECAT Pre Engineering Physics Chapter 21 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 21 Nuclear Physics

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

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Physics ECAT Pre Engineering Chapter 21 Nuclear Physics

00:00
Question # 1

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

Question # 2

Charge on proton is

Question # 3

The nucleus left after the emission of some radiation is called:

Question # 4

Radioactivity

Question # 5

Alfa , beta and gamma rays are emitted from a radio-active substance

Question # 6

During the nuclear changes, the law/s of conservation that hold/s are that of:

Question # 7

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

Question # 8

The figure 1.007276μ shows the mass of an:

Question # 9

Neutron was disvovered by:

Question # 10

The penetration power ofβ-particle is

Question # 11

An alpha particle has a charge of

Question # 12

How many isotopes of helium are present?

Question # 13

Gamma rays consist of steam of

Question # 14

1 amu is equal to.

Question # 15

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 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
2 Neutrons are
A. positive charge
B. negatively charged
C. massless
D. neutral
3 Mass of proton is
A. 1.67 x 10-27kg
B. 1.67 x 10-31kg
C. 1.66 x 10-34kg
D. 1.67 x 10-17kg
4 When radioactive nucleus emits aβ-particle, the proton-neutron ratio
A. decrease
B. increase
C. same
D. none of these
5 The reciprocal of decay constant λ of a radioactive material is:
A. Frequency
B. Half life
C. Year
D. Mean life
6 Different radioactive material have
A. same half lives
B. different half lives
C. same mean lives
D. same total lives
7 The number of isotopes of hydrogen are
A. 2
B. 1
C. 3
D. 4
8 Gamma rays consist of steam of
A. electron
B. proton
C. photons
D. all of these
9 When certain nucleus emits anα particle, its mass number:
A. Increases by one
B. Decreases by one
C. Remain same
D. Decreases by four
10 The number if neutrons in the nucleus of 92U235are
A. Infinite
B. 92
C. 235
D. 143

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  • alishba rasheed

    alishba rasheed

    03 Mar 2018

    easy mcqs

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