Nuclear Energy

Q.

Why is heavy water used in nuclear reactors?

Q.

In the nuclear reaction, ${}_{92}\mathrm{U}^{238}\to {}_{82}\mathrm{Pb}^{206}$the number of $\alpha$ and $\beta$ particles emitted is:

1. 7$\alpha$, 5$\beta$

2. 6$\alpha$, 4$\beta$

3. 4$\alpha$, 3$\beta$

4. 8$\alpha$, 6$\beta$

Q. Energy released during fission of one nucleus of U-235 is about: (Given: energy released per nucleon is 0.8 MeV)

1. 200 MeV
2. 2000 MeV
3. 1 MeV
4. 20 MeV

Q.

The control rods used in the reactor of a nuclear power plant are made of :
(a) steel (b) graphite (c) uranium (d) boron

Q. The energy released by 1 kg uranium fission is

1. 
   $8\times {10}^{10}J$
2. 
   $8\times {10}^{13}J$
3. 
   $4\times {10}^{10}J$
4. 
   $4\times {10}^{13}J$

Q.

Which of the following is used as a moderator in the reactor of a nuclear power station ?
(a) liquid sodium (b) boron (c) graphite (d) carbon dioxide

Q.

Name the moderator used in a nuclear reactor.

Q.

What are the disadvantage of using nuclear energy ?

Q. What are the sources of energy?

Q.

The energy which is not derived from the sun is

1. Biomass

2. Fossil fuels

3. Nuclear energy

4. Geothermal energy

Q.

Is nuclear energy a non-conventional or conventional source of energy?

Q.

(a) What is a nuclear reactor ? What is the fuel used in a nuclear reactor ?
(b) With the help of a labelled diagram, describe the working of a nuclear power plant.
(c) How is the working nuclear reactor of a power plant shut down in an emergency ?
(d) Name five places in India where nuclear power plants are located.

Q.

Of what material are the control rods of a nuclear reactor made ?

Q.

Which is more powerful fission or fusion?

Q.

Which of the energies given below is not energy achieved from the sea

1. Tidal energy

2. Wave energy

3. Nuclear energy

4. Thermal energy

Q. Which energy resource does not derive its energy from the Sun?

1. 
   

   hydroelectric

2. 
   

   Nuclear fission

3. 
   

   sea-waves

4. 
   

   wind

Q. Explain why, in a nuclear reactor, the chain reaction stops if the control rods re fully inserted into the graphite.

Q. During nuclear reactions (fission or fusion), energy is released.

1. small amount of
2. large amount of
3. moderate amount of
4. zero

Q. Why is a "Breeder Reactor" called so?

1. It generates nuclear fuel which can be used for fission chain reaction
2. It generates very high amount of energy
3. It is a fusion reactor
4. It doesn't consume any nuclear fuel

Q.

What is the difference between nuclear fission and fusion?

Q. Why nuclear fusion is not possible as an energy generation initiative till now

Q.

Arrange radioactive radiations in the order of increasing penetrating power.

Q.

The heat energy released during nuclear fission and fusion is due to the :
(a) conversion of stored chemicals into energy (b) conversion of momentum into energy
(c) conversion of mass into energy (d) conversion of magnetism into energy

Q. What do you mean by nuclear fission?explain.Advantages as well as disadvantages of nuclear fission.

Q. Which of the following reactions occur during explosion of an atom bomb?

1. Nuclear fission

2. Nuclear fusion

3. Nuclear decomposition

4. Nuclear diffusion

Q.

Which of the following is ultimately not derived from the sun's energy (or solar energy) ?
(a) wind energy (b) nuclear energy
(c) biomass energy (d) ocean thermal energy

Q.

Name a non-renewable source of energy other than fossil fuels.

Q. How does inserting the control rods in the graphite core affect the fission in the reactor ? Explain your answer.

Q.

Which one of the following is not renewable energy technology ?
(a) solar cells (b) windmills (c) nuclear power (d) tidal power

Q.

How many MeV are equivalent to 1 atomic mass unit (u)?