Interstellar Alchemy

Q.

Choose the correct option for solar energy is due to:

1. Chemical reaction

2. Combustion reaction

3. Nuclear fission reaction

4. Nuclear fusion reaction

Q.

Does fusion absorb energy ?

Q.

Statement A: For nuclear fusion to take place, a very high temperature is required.

Statement B: A hydrogen bomb is based on a nuclear fusion reaction

1. Both statements A and B are true.

2. Statement A is true. Statement B is false.

3. Statement A is false, and statement B is true.

4. Both statements A and B are false.

Q. Energy generation in stars is due to nuclear fusion.
a) How a nuclear fusion is occurred?
b) The energy released in nuclear fission process with uranium is of the order of ________.

Q. Solar energy is due to

1. fusion reactions
2. fission reactions
3. combustion reactions
4. chemical reactions

Q. Solar energy is produced by the following reaction

1. Fission reaction
2. Fusion reaction
3. chemical reaction
4. None of the above

Q. In the carbon cycle, from which stars hotter than the sun obtain their energy, the ${}_6{C}^{12}$ isotope

1. splits into three alpha particles
2. is completely converted into energy
3. fuse with another ${}_6{C}^{12}$ nucleus to form ${}_{12}M{g}^{24}$
4. is regenerated at the end of the cycle

Q. What is the source of energy in sun and stars ?

1. Nuclear fission
2. Burning of coal
3. Vibration of electrons
4. Nuclear fusion

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 $4.0026amu$ and mass of oxygen nucleus is $15.9994amu$]

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

Q. The energy produced in the sun is due to

1. Fission reaction
2. Fusion reaction
3. Chemical reaction
4. Motion of electron and ions

Q. The source of the sun's energy is :

1. coal
2. petroleum
3. gravitational force
4. nuclear reactions

Q. In sun, the important source of energy is

1. proton-proton cycle
2. carbon-nirtogen cycle
3. carbon-caron cycle
4. nitrogen-nitrogen cycle

Q.

The energy produced by the Sun largely involves which of the following nuclei?

1. Pu

2. Li

3. U

4. H

Q. Match the nuclear processes given in column I with the appropriate option(s) in column II.

Q. What do you understand by the term nuclear fusion?

Q. The cesium isotope ${137}^{Cs}$ is present in the fallout from aboveground detonations of nuclear bombs. Because it decays with a slow (30.2 y) half-life into $ 137^{Ba} . releasing considerable energy in the process, it is of environmental concern. The atomic masses of the Cs and Ba are 136.9071 and 136.9058 u, respectively; calculate the total energy released in such a decay.

Q.

The energy produced by the Sun largely involves which of the following nuclei?

1. Pu

2. Li

3. U

4. H

Q.

The process by which the percentage of $U-235$ in $U-238$ is increased is called

1. Fission

2. Fusion

3. Chain reaction

4. Enrichment

Q. The example of nuclear fusion is :

1. Formation of helium from hydrogen
2. Formation of barium and krypton from uranium
3. Formation of plutonium - $235$ from uranium $-235$
4. Formation of water from hydrogen and oxygen

Q. Electron-positron pair can be created by $\gamma$-rays. In this process the minimum energy of $\gamma$-rays should be :

1. $5.0MeV$
2. $4.02MeV$
3. $15.0MeV$
4. $1.02MeV$

Q. __________ reaction takes place in the sun.

1. Nuclear fission
2. Nuclear fusion
3. Chemical
4. Both (A) and (B)

Q.

Nuclear fusion

1. Uses large nuclides

2. Takes place in a fusion reactor

3. Takes place in the sun

4. Is used in atomic bombs