Unit 21: Nuclear Physics

1

Which particle is present inside the nucleus?

A Electron B Photon C Proton D Positron

2

The nucleus is extremely small compared to the:

A Electron B Atom C Proton D Neutron

3

Dark matter is believed to:

A Emit light B Absorb light C Have gravitational effects D Be visible

4

Medical tracers commonly use:

A Stable isotopes B Radioisotopes C Electrons D Neutrons

5

Which process releases more energy per unit mass?

A Chemical reaction B Nuclear fission C Nuclear fusion D Combustion

6

Beta particles are:

A Protons B Neutrons C Electrons D Photons

7

Background radiation mainly comes from:

A Television B Natural sources C Mobile phones D Electric wires

8

Which nuclear radiation is unaffected by electric fields?

A Alpha B Beta C Gamma D Proton

9

Nuclear fusion is the process of:

A Breaking nuclei B Combining light nuclei C Electron emission D Radiation absorption

10

A scientific theory is falsifiable if it can be:

A Proved true B Observed directly C Tested and proven false D Mathematically solved

11

The main source of energy of the Sun is:

A Nuclear fission B Chemical reaction C Nuclear fusion D Radioactivity

12

Who discovered the atomic nucleus through the gold foil experiment?

A J.J. Thomson B Ernest Rutherford C Niels Bohr D James Chadwick

13

Mass number of an atom is equal to:

A Protons only B Neutrons only C Protons + electrons D Protons + neutrons

14

Atoms of the same element with different mass numbers are called:

A Isobars B Isotones C Isotopes D Nuclides

15

Which decay results in the emission of an electron?

A Alpha decay B Beta decay C Gamma decay D Fusion

16

The SI unit of radioactivity is:

A Gray B Sievert C Becquerel D Curie

17

A chain reaction occurs when:

A Electrons collide B Neutrons cause further fissions C Protons combine D Energy is lost

18

The nucleus of an atom carries:

A Negative charge B No charge C Positive charge D Variable charge

19

Half-life of a radioactive substance is the time required for:

A All atoms to decay B Half of the atoms to decay C One atom to decay D Radiation to stop

20

Which particle has no electric charge?

A Proton B Electron C Neutron D Alpha particle

21

Which radiation consists of helium nuclei?

A Alpha rays B Beta rays C Gamma rays D X-rays

22

Which device is used to detect radiation?

A Thermometer B Galvanometer C Geiger-Muller counter D Voltmeter

23

The relation E = mc² shows that:

A Mass is constant B Energy is conserved C Mass can be converted into energy D Energy depends on velocity

24

Control rods in a nuclear reactor absorb:

A Protons B Electrons C Neutrons D Gamma rays

25

Fusion requires very high:

A Pressure only B Temperature only C Temperature and pressure D Density only