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

Alfa particles are

Question # 2

The distance travelled byα-particle in a medium before coming to rest, is called

Question # 3

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

Question # 4

Nucleus consists of

Question # 5

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

Question # 6

The half life of uranium-238 is

Question # 7

Charge on proton is

Question # 8

The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains

Question # 9

There is present in paraffin a large amount of:

Question # 10

Proton was discovered by Rutherford in

Question # 11

Radioactivity was discovered by

Question # 12

Mass of neutron is

Question # 13

For Protium, the mass defect is:

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 An alpha particle has a charge of
A. +2e
B. -2e
C. -e
D. +3e
2 The unit of decay constant is:
A. Second
B. Metre
C. Hour
D. Year
3 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
4 In 1932 Chadwick discovered
A. proton
B. neutron
C. photon
D. electron
5 Alfa particles are
A. hydrogen nuclei
B. helium nuclei
C. electrons
D. photons
6 Which of the following material has longer half life
A. radium
B. polonium
C. radium
D. uranium
7 Heavy water is made of one oxygen atom and two atoms of:
A. Protium
B. Deuterium
C. Tritium
D. Any of these
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 diameter of an atom is of the order
A. 10-125m
B. 10-11m
C. 10-10m
D. 10-9m
10 Radioactivity
A. is exhibited more by semiconductors in general
B. in exhibited more by the element when they are coupled
C. with other radioactive elements by a covalent bond
D. is an atomic property of radioactive elements

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