ECAT Pre General Science Physics Chapter 21 MCQ Test With Answer

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

00:00
Question # 1

After alpha decay the atomic number of the atom

Question # 2

Rutherford performed an experiment on nuclear reactions in:

Question # 3

The nucleus/nuclei of hydrogen is/are:

Question # 4

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

Question # 5

The diameter of an atom is of the order

Question # 6

According to Rutherford atomic model, the positive charge in an atom

Question # 7

A curie represents a very strong source of

Question # 8

Neutron was suggested to be in the nucleus by:

Question # 9

In wilson cloud chamber, the air becomes saturated with:

Question # 10

Radioactivity was discovered by

Question # 11

The rate of decay of a radioactive substance

Question # 12

The chemical properties of all the isotopes of an elements are

Question # 13

Different radioactive material have

Question # 14

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

Question # 15

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

Question # 16

For an atom having atomic number Z and atomic weight A, the charge on the nucleus is

Question # 17

Nucleus of a hydrogen atom may contain:

Question # 18

Binding energy per nucleus is

Question # 19

Fraction of the decaying atoms per unit time is called

Question # 20

The range of particle depends upon the factor

Question # 21

Charge on proton is

Question # 22

A particle having the mass of electron and charge of a proton is called a

Question # 23

U-238 present in the natural uranium is about:

Question # 24

Which of the following material has smaller has life

Question # 25

Mass of neutron is

Question # 26

Referring to the above figure, we can say that of all the elements, the most stable element is

Question # 27

There is present in paraffin a large amount of:

Question # 28

If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be

Question # 29

Radium was discovered by:

Question # 30

The range ofβ-particle in air is greater than that ofα-particle by

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 When certain nucleus emits aβ-particles, is mass number:
A. Remain same
B. Increases by one
C. Decreases by one
D. Decreases by four
2 The chemical behaviour of an atom is determined by
A. binding energy
B. atomic number
C. mass number
D. number of isotopes
3 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
4 For an atom having atomic number Z and atomic weight A, the charge on the nucleus is
A. A - Z
B. A + Z
C. Z
D. A
5 Alfa particles are
A. hydrogen nuclei
B. helium nuclei
C. electrons
D. photons
6 The unit of decay constant is
A. sex
B. sec2
C. sec-1
D. sec-2
7 The range of particle depends upon the factor
A. charge, mass and energy of particle
B. density of medium
C. ionization potential of the atoms
D. all the above
8 After alpha decay the atomic number of the atom
A. increase by four
B. decreases by two
C. increases by two
D. decrease by four
9 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
10 Mass of proton is of order of
A. 10-31gm
B. 10-27kg
C. 10-24gm
D. 10+27kg

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