ECAT Pre Engineering Physics Chapter 21 MCQ Test With Answer

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

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Physics ECAT Pre Engineering Chapter 21 Nuclear Physics

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Question # 1

For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is

Question # 2

A curie represents a very strong source of

Question # 3

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

Question # 4

The unit of decay constant is:

Question # 5

When certain nucleus emits anα particle, its mass number:

Question # 6

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

Question # 7

There is present in paraffin a large amount of:

Question # 8

Neutron was discovered in

Question # 9

The half life of radioactive substances depends upon

Question # 10

In radioactive decay, the new element which is formed due to the disintegration of original element is called

Question # 11

The mass of the nucleus is always less than the total man of the protons and neutron that make up the nucleus. The difference of the two masses is called

Question # 12

The range of particle depends upon the factor

Question # 13

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

Question # 14

When radioactive nucleus emits aβ-particle, the proton-neutron ratio

Question # 15

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Alfa particles are
A. hydrogen nuclei
B. helium nuclei
C. electrons
D. photons
2 Referring to the above figure, we can say that of all the elements, the most stable element is
A. Phosphours
B. Iron
C. uranium
D. Lithium
3 During the nuclear changes, the law/s of conservation that hold/s are that of:
A. Charge
B. energy
C. Momentum
D. Mass
4 The reciprocal of decay constant λ of a radioactive material is:
A. Frequency
B. Half life
C. Year
D. Mean life
5 Three quarks make:
A. An electron
B. A meson
C. A baryon
D. A photon
6 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
7 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
8 An alpha particle has a charge of
A. +2e
B. -2e
C. -e
D. +3e
9 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
10 U-238 present in the natural uranium is about:
A. 59%
B. 0.007%
C. 99%
D. 39%

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