Nuclear Fission

Q. State true or false.
Nuclear reactions are exothermic in nature and produces large amount of energy.

1. True
2. False

Q. Energy released in the fission of 1 kg of U-235 is equivalent to energy obtained from burning of coal weighing ___.

1. 2500 ton
2. 25000 ton
3. 25 ton
4. 250 ton

Q. Which of the following correctly matches the hydrogen bomb and an atom bomb with the principle used in them?

1. Hydrogen bomb - Fission reaction; Atom bomb - Fusion reaction
2. Hydrogen bomb - Fission reaction; Atom bomb- Fission reaction
3. Hydrogen bomb - Fusion reaction; Atom bomb - Fusion reaction
4. Hydrogen bomb - Fusion reaction; Atom bomb - Fission reaction

Q. Why do only big nuclei undergo nuclear fission reaction?

1. Bigger nuclei are unstable because of presence of large number of like charge particles.
2. Bigger nuclei have less number of neutron which makes them unstable.
3. Bigger nuclei have very less number of protons which makes them unstable.
4. In case of bigger nuclei, electron reside inside the nucleus.

Q. The process in which a heavy nucleus splits into two lighter nuclei, when hit by neutrons is:

1. Nuclear fusion
2. Thermal fission
3. Radioactive decay
4. Nuclear fission

Q. In a nuclear fission process, what happens to the nucleus of an atom?

1. A heavier nucleus is broken into lighter nuclei.
2. Lighter nuclei fuse together to form heavier nucleus.
3. Nucleus ejects protons.
4. Nucleus shed its electrons.

Q. Statement 1: Nuclear bombs can destroy big cities.
Statement 2: Nuclear power plants can produce energy to power big cities.

1. Only statement​ 1 is correct.
2. Both statements are correct.
3. Only statement​ 2 is correct.
4. Both statement s are wrong.

Q. A nuclear reaction, whether fission or fusion, releases a ____ amount of energy.

1. enormous
2. moderate
3. zero
4. little

Q.

The scientist who first carried out critical nuclear fission reaction is _____.

1. Otto Hahn

2. Enrico Fermi

3. Hans Bethe

4. Einstein

Q. There are two atoms A and B. The atomic number of A is $116$ and the atomic number of B is $29$. Which of them is more capable of undergoing nuclear fission reaction?

1. Only B
2. Both A and B
3. Only A
4. Neither A nor B