Nuclear Fusion

Q.

Who invented atomic bomb?

Q.

If the binding energy of deuterium is 2.23 MeV, then the mass defect (in amu) is?

1. 0.0024 MeV

2. 0.0048 MeV

3. 0.0036 MeV

4. 0.0012 MeV

Q. The temperature required for the nuclear fusion is approximately.

1. ${10}^3\text{K}$
2. ${10}^7\text{K}$
3. ${10}^5\text{K}$

Q. reaction takes place in the Sun.

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

Q. Common coolant used in a nuclear reactor is:

1. Boron
2. Uranium
3. Liquid sodium
4. Liquid nitrogen

Q.

The process by which energy is released in sun is

1. Nuclear fission

2. Chemical reaction

3. Nuclear fusion

4. None of these

Q. Nuclear fission is an exothermic process whereas nuclear fusion is an endothermic process.

1. energy stored by waves in the ocean

2. temperature difference at different levels in the ocean

Q. Find the binding energy of ${}_{26}^{56}Fe$. Atomic mass of ${}^{56}Fe$ is 55.9349 u and that of ${}^{1}H$ is 1.00783 u. Mass of neutron = 1.00867 u.

1. 292 MeV
2. 392 MeV
3. 592 MeV
4. 492 MeV

Q. A nucleus of mass $M+△m$ is at rest and decays into two daughter nuclei of equal mass $\frac{M}{2}$ each. Speed of light is $c$.
The speed of daughter nuclei is $c\sqrt{\frac{2△m}{M}}$

1. False
2. True

Q.

The Sun radiates energy in all directions. The average radiation received on the earth surface from the Sun is $1.4\raisebox{1ex}{$kW$}\!\left/ \!\raisebox{-1ex}{$m^2$}\right.$. The average Earth-Sun distance is $1.5\times {10}^{11}m.$ The mass lost by the Sun per day is(1day=86400s)

1. $4.4\times {10}^{9}kg$

2. $7.6\times {10}^{14}kg$

3. $3.8\times {10}^{12}kg$

4. $3.8\times {10}^{14}kg$

Q. If a star can convert all the He nuclei completely into oxygen nuclei. The energy released per oxygen nuclei is [Mass of He nucleus is 4.0026 amu and mass of oxygen nucleus is 15.9994 amu]. [IIT-JEE-2005]

1. 7.6 MeV
2. 56.12 MeV
3. 10.24 MeV
4. 23.9 MeV

Q.

The strong nuclear force between nucleons is attractive but short range; the Coulomb force between protons is long range, but repulsive.

1. True

2. False

Q.

(a) What is nuclear fusion ? Explain with an example. Write the equation of the reaction involved
(b) Why are very high temperatures required for fusion to occur ?

Q.

The source of energy of the sun is ___

1. nuclear fission

2. chemical reaction

3. nuclear fusion

4. photoelectric effect

Q.

Control rods used in nuclear reactors are made of

1. stainless steel

2. graphite

3. cadmium

4. plutonium

Q. The mass defect in a particular nuclear reaction is 0.3 grams. The amount of energy liberated in kilowatt hours is
(Velocity of light =$3\times {10}^8$m/s )

1. $1.5\times {10}^6$
   
2. $2.5\times {10}^6$
   
3. $3\times {10}^6$
   
4. $7.5\times {10}^6$

Q.

Which of the following can undergo nuclear fusion reaction ?

(a) uranium (b) deuterium (c) barium (d) krypton

Q.

A nuclear reaction is represented by the equation :
$\underset{1}{2}H+\underset{1}{2}H⟶\underset{2}{3}He+xc+E$
(a) Name the process represented by this equation and describe what happens during this reaction.
(b) Identify the particle c and the number x of such particles produced in the reaction.
(c) What does E represent ?
(d) State two conditions under which such a reaction takes place.
(e) What type of nuclear bomb is based on similar reactions ?

Q.

Which one of the following would be most likely to undergo thermonuclear fusion?

1. ${}^{56}$Fe

2. ${}^4$He

3. ${}^2$H

4. ${}^{235}$U

Q. In fission of one uranium-235 nucleus, the loss in mass is 0.2 a.m.u Calculate the energy released.

Q. What type of reactions occurring inside the sun produce solar energy ?

Q.

How does the sun burn in space as the sun is a ball of fire?

Q.

What do you mean by binding energy?

Q.

The source of energy of the sun is :
(a) conversion of hydrogen gas into helium
(b) conversion of carbon fuel into carbon dioxide
(c) burning of hydrogen gas present in the sun
(d) disintegration of uranium into barium and krypton

Q.

What causes the release of energy from the sun and stars?

Q. Pick the correct raw material suitable for producing nuclear energy.

1. Sodium
2. Uranium
3. Platinum
4. Rhodium

Q. How sun and stars have light emitting power only why dontd humans have ?

Q.

Explain nuclear fusion in brief.

Q.

Which of the following is correct ?

Statement I: Neutron to proton ratio less than 1 especially in a heavy nuclei makes it highly unstable.

Statement II: Nucleus where protons are separated by a large distance are dominated by repulsive electrostatic force.

1. Statement I is false but II is true
2. Both statements are false
3. Both statements are always true and statement II is the correct reason for statement I
4. Statement I is not always true but II is correct

Q.

Complete the following nuclear changes:

1. 

2. 

3. 

4.