Question # 1

For an atom having atomic number Z and atomic weight A, the number of electron in an atoms

Choose an answer

A - Z

A + Z

Z

A

When a nucleus emits an alpha particles, its charge number decreases by

Choose an answer

3

2

6

5

The half lie of radium-226 is

Choose an answer

238 years

4.5 x 10⁹days

1620 years

332 years

Heavy water is made of one oxygen atom and two atoms of:

Choose an answer

Protium

Deuterium

Tritium

Any of these

None of these

The half life of radioactive substances depends upon

Choose an answer

amount of substance

energy of substance

state of substance

temperature of substance

The figure 1.007276μ shows the mass of an:

Choose an answer

Atom

Positron

Electron

Neutron

Proton

The range of particle depends upon the factor

Choose an answer

charge, mass and energy of particle

density of medium

ionization potential of the atoms

all the above

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

Choose an answer

Equal to 1

Less than 1

Greater than 1

Infinity

Rutherford performed an experiment on nuclear reactions in:

Choose an answer

1718 A.D

1818 A.D

1918 A.D

2001 A.D.

1701 A.D.

Nucleus consists of

Choose an answer

proton and neutron

protons and electron

electron and neutron

protons only

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

Choose an answer

Phosphours

Iron

uranium

Lithium

Bismuth

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

Choose an answer

-4

4

2

1

The rate of decay of radioactive substance

Choose an answer

is constant

decrease exponentially with time

varies inversely as time

decreases linearly with time

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

Choose an answer

half time

half life

disintegration time

mean life

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

Choose an answer

A - Z

A

Z

A + Z

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

Choose an answer

600

7000

5000

15000

Radioactivity

Choose an answer

is exhibited more by semiconductors in general

in exhibited more by the element when they are coupled

with other radioactive elements by a covalent bond

is an atomic property of radioactive elements

More Classes

Other Links

ECAT Physics Chapter 21 Nuclear Physics Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer