Free Printable Nuclear Physics

1.

Protons and Neutrons in a nucleus are collectively called as

a)

elements

b)

atom

c)

nucleons

d)

positron

e)

None of the other options

2.

The size of the nucleus is about

a)

1 fermi

b)

1 femtometer

c)

10^-15m

d)

all of the options

3.

alpha particle scattering experiment which led to the discovery of atomic nucleus was performed by

a)

Geiger and Marsden

b)

Enrico fermi

c)

Thomson

d)

Elster and Geital

4.

Atomic number ( Z) refers to

a)

number of protons

b)

number of neutrons

c)

number of nucleons

d)

None of the options

5.

Mass number ( A) refers to

a)

number of protons

b)

number of neutrons

c)

number of nucleons

d)

None of the options

6.

Nuclides with same atomic number but different mass number are called

a)

isobars

b)

isotones

c)

isotopes

d)

none of the options

7.

Nuclides with different atomic number but same mass number are called

a)

isobars

b)

isotones

c)

isotopes

d)

none of the options

8.

Nuclei with an equal number of neutrons are called

a)

isotones

b)

isobars

c)

isotopes

d)

none of the options

9.

Isotopes of an element have different chemical behaviour

a)

True

b)

False

10.

Isobars of an element have different chemical behaviour

a)

True

b)

False

11.

The energy equivalent of one atomic mass unit is

a)

931.5eV

b)

931.05eV

c)

931.5KeV

d)

931.5MeV

e)

901.5MeV

12.

If A is the mass number of a nucleus of radius R then

a)

$R\propto A^{\frac{1}{3}}$

b)

$R\propto A^{\frac{1}{2}}$

c)

$R\propto A^{\frac{1}{4}}$

d)

$R=R_0A^{\frac{1}{2}}$

e)

None of the options

13.

$Find\ the\ density\ of\ C^{12}\ nucleus.\$
$The\ radius\ of\ the\ nucleus\ is\ 2.7fm.\$

\left(m_p=1.67\ \times10^{-27}kg\right)

a)

$1\times10^{17}kgm^{-3}$

b)

$2.4\times10^{17}kgm^{-3}$

c)

$3\times10^{17}kgm^{-3}$

d)

$1.5\times10^{17}kgm^{-3}$

14.

Nuclear magneton is smaller than Bohr magneton.

a)

True

b)

False

15.

A deutirium nuclei has

a)

1 neutron and 1 proton

b)

only 1 proton

c)

only one neutron

d)

two neutrons and one proton

16.

A stable nuclei has in general

a)

odd number of protons and neutrons

b)

odd number of protons and even number of neutrons

c)

even number of protons and neutrons

d)

equal number of protons and neutrons (both odd or even)

17.

The force that hold nucleus together is

a)

Gravitational

b)

Electrostatic

c)

nuclear

d)

none of the options

18.

Mass defect refers to

a)

inaccurate measurements of mass of nucleons

b)

difference in the number of neutrons

c)

mass annihilated to produce energy to bind the nucleons

d)

none of the options

19.

For atomic nuclei, the Binding energy per nucleon

a)

increases continuously with increase in mass number

b)

decreases continuously with increase in mass number

c)

remains constant with increase in mass number

d)

first increases then decreases with increase in mass number

20.

An atomic nucleus has mass

a)

less than the total mass of their constituent protons and neutrons

b)

equal to the total mass of their constituent protons and neutrons

c)

more than the total mass of their constituent protons and neutrons

d)

none of the options

21.

Which of the below statements are true

a)

Nuclear forces exhibit saturation property

b)

Nuclear forces are spin independent

c)

Nuclear forces are charge independent

d)

Nuclear force is a type of an exchange force.

22.

The neutrons released during fission can lead to the fission of other nuclei and a self sustaining sequence of fission could take place. This is called (a)

23.

Nuclear Bomb is an example where controlled chain reaction takes place.

a)

True

b)

False

24.

The ratio of secondary neutrons produced to the original neutrons is called (a)

25.

If the multiplication factor is 1 the fission reaction is said to be

a)

critical

b)

sub critical

c)

super critical

d)

none of the options

26.

If the multiplication factor is less than 1 the fission reaction is said to be

a)

critical

b)

sub critical

c)

super critical

d)

none of the options

27.

The basic energy producing process in the Sun involves

a)

proton - proton cycle

b)

carbon cycle

c)

neutron pressure/degeneracy

d)

none of the options

28.

The substance used for slowing down the neutrons in a nuclear reactor is called (a)

29.

In a nuclear reactor, (a) is used to adjust the rate of the chain reaction

30.

The phenomenon of spontaneous decay of an unstable nucleus by emitting energetic particles or electromagnetic radiation is called (a)

31.

Final product after alpha decay

a)

atomic number reduces by 2 and mass number reduces by 4

b)

atomic number increases by 1 and mass number remains unchanged

c)

atomic number decreases by 1 and mass number remains unchanged

d)

No change in atomic number and mass number

32.

Final product after negative beta decay

a)

atomic number reduces by 2 and mass number reduces by 4

b)

atomic number increases by 1 and mass number remains unchanged

c)

atomic number decreases by 1 and mass number remains unchanged

d)

No change in atomic number and mass number

33.

Final product after positive beta decay

a)

atomic number reduces by 2 and mass number reduces by 4

b)

atomic number increases by 1 and mass number remains unchanged

c)

atomic number decreases by 1 and mass number remains unchanged

d)

No change in atomic number and mass number

34.

Final product after electron capture by nucleus

a)

atomic number reduces by 2 and mass number reduces by 4

b)

atomic number increases by 1 and mass number remains unchanged

c)

atomic number decreases by 1 and mass number remains unchanged

d)

No change in atomic number and mass number

35.

Final product after gamma decay

a)

atomic number reduces by 2 and mass number reduces by 4

b)

atomic number increases by 1 and mass number remains unchanged

c)

atomic number decreases by 1 and mass number remains unchanged

d)

No change in atomic number and mass number

36.

The time required for one half of the parent material to decay is called

a)

half life

b)

mean life

c)

decay constant

d)

radioactivity

37.

Radioactive decay is a statistical process that obeys the law of chance.

a)

True

b)

False

38.

$\frac{sum\ of\ lives\ of\ all\ atoms}{total\ number\ of\ atoms}\ gives$

a)

half life

b)

decay constant

c)

activity

d)

mean life

39.

The total decay rate of any radioactive nuclide is called the (a) of that nuclide

40.

The amount of energy / radiation absorbed per gram of body tissue is measured in unit called (a)

41.

The half life of a radioactive element is 1 year. After what time the element present in the specimen will be 1/64 of its original value.

a)

5 years

b)

7 years

c)

6 years

d)

8 years

42.

Cyclotron is used to accelerate electrons

a)

True

b)

False

43.

The nuclear matter density is nearly a constant and is independent of mass number.

a)

True

b)

False

44.

If 200 MeV energy is released in the fission of a single nucleus of Uranium. How many fissions must occur per second to produce a power of 1000 J.

a)

$2\times10^{13}$

b)

$2.5\times10^{13}$

c)

$3.125\times10^{13}$

d)

$4\times10^{10}$

45.

Linear accelerator is used to accelerate

a)

electron

b)

positive ions

c)

negative ions

d)

all the options

46.

The magnetic field strength in a 5 MeV proton cyclotron is 1 Tesla. What is the required frequency of the oscillator controlling the potential of the dees. $m_p=1.67\times10^{-27}kg$

a)

15.2MHz

b)

14MHz

c)

15.2KHz

d)

14KHz

47.

The length of the drift tubes in a linear accelerator are in the ratio

a)

$1:2:3..........$

b)

$1:\sqrt{2\ }:\sqrt{3}.............$

c)

$1:4:9.............$

d)

$1:3:5...............$

48.

Radioactivity was discovered by

a)

Henry Becquerel

b)

Madam Curie

c)

Pierre Curie

d)

None of the options

49.

The half life of radon is 3.8 days. Calculate how much of 15mg of radon will remain after 38 days

a)

0.010 gm

b)

0.0010gm

c)

0.015gm

d)

5mg

50.

Fusion reaction is also known as thermonuclear reaction

a)

True

b)

False

Nuclear Physics

Total questions: 50

Worksheet time: 41mins

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