Array Unit 18 Physics 10th Class MCQ Test Preparation Punjab

Total Questions: 20

Total Marks: 20

Time: 20 Mins

Question # 1

The temperature at the centre of the Sun is nearly

20 million Kelvin
10 million Kelvin
30 million Kelvin
25 million Kelvin

Question # 2

In nuclear fission, as compared to the original mass of the heavy nucleus, the total mass of the product is

Equal
more
Less
Zero

Question # 3

Why are heavy nuclei unstable?

Coulomb's repulsive force becomes more dominant in heavy nuclei
Gravitational force becomes more dominant in heavy nuclei
Strong nuclear force becomes more dominant in heavy nuclei
None of these

Question # 4

The range of particle depends on which of the following factors?

Ionization potential of atoms
All of these
Charge, mass and energy of particle
Density of medium

Question # 5

Which of the following is true about nuclear fusion?

It produces more energy than nuclear fission
It is easy to implement
It produces less energy than nuclear fission
It has the ability to occur easily in everyday life

Question # 6

Gamma radiation are fast moving

Electrons
Protons
Photons
Neutrons

Question # 7

Compound containing some amount of radioisotope is

Tracer
Radioactive compound
Non radioactive
Linear active compound

Question # 8

When alpha and beta particles are slowed down by collisions, they become

Harmful
Harmless
Useful
Expensive

Question # 9

There are possible dangers when dealing with radioactive substances, so which of the following statements is correct?

Radioactive materials are safe to handle after two half-lives
Materials that emit only alpha particles must be kept in thick lead containers
Gamma radiation is more dangerous than alpha or beta particles because it has a longer half-life
Beta particles can pass through skin and damage body cells

Question # 10

How is fission chain reaction controlled?

By introducing iron rods
By introducing graphite rods
By introducing cadmium rods
All of these

Question # 11

What is the safest way to dispose of a large quantity of highly radioactive waste?

Burning it on a fire
Burying it in a dry rock, deep underground
Pouring it down the drain
Pumping it into a river

Question # 12

In SI base units, 1 Bq is equal to

10 Disintegration per second
1.5 disintegration per second
0.01 disintegration per second
1 disintegration per second

Question # 13

If half life of radium is 1600 years, then what will be the fraction of radium that would remain undecayed after 6400 years?

Question # 14

In each fission event, the energy released is about

100 MeV
300 MeV
400 MeV
200 MeV

Question # 15

By what factor, the charge number decreases when a nucleus emits an alpha particle?

Question # 16

Times a proton is heavier than an electron is

1827
1876
1836
1789

Question # 17

In which type of radioactive disintegration, neutron dissociates into proton and electron?

β emission
α emission
γ emission
All of these

Question # 18

The age of fossil when C-14,C-12 in bone is one fourth of ratio in bone of living animal andhalf-life of C-14 is 5732 years is

100 years
11460 years
1000 years
1200 years

Question # 19

Why are neutrons considered as ideal particles for nuclear fission?

Neutrons are neutral and they do not experience any coulomb force of attraction or repulsion
Neutrons do not experience any coulomb force of attraction or repulsion
Neutrons are neutral
Neutrons experience large coulomb force of attraction or repulsion

Question # 20

Alpha α particles are helium (He) nucleus with a charge of