Chain Reaction of Uranium

Q.

What are gamma rays

Q. The number of neutrons accompanying the formation of ${}_{54}^{139}Xe$ and ${}_{38}^{94}Sr$ from the absorption of a slow neutron by ${}_{92}^{235}U$, followed by nuclear fission is:

1. \N
2. 2
3. 1
4. 3

Q. On an average how many neutrons are emitted in the fission reaction of U-235?

1. 5
2. 3.4
3. 2.4
4. 10

Q. In the given radioactive disintegration series, ${}_{92}^{235}U{\to }_{82}^{207}Pb$ Calculate the difference between the number of $\alpha$ and $\beta$ particles emitted in this series.

Q. ${}_5^{10}B{+}_2^{4}He⟶?{+}_0^{1}n$

1. ${}_7^{13}N$
2. ${}_7^{11}N$
3. None of these
4. ${}_7^{14}N$

Q. On an average how many neutrons are emitted in the fission reaction of U-235?

1. 2.4
2. 5
3. 3.4
4. 10

Q. The relative atomic mass of an atom is:

1. measured in atomic mass units (u)
2. based on the mass of 1 atom of carbon-12
3. different for different isotopes of an element
4. all of the above are true

Q. Isotope of oxygen is used to detect the reaction mechanism of:

1. formation of esters
2. formation of alkenes
3. formation of alkanes
4. formation of amines

Q. Which of these statements are correct regarding Uranium isotopes?

1. U-238 is the most abundant isotope of Uranium
2. U-238 is more stable than the U-235
3. U-236 is not found in nature due to high instability
4. U-235 is majorly used as the nuclear fuel

Q. U-235 requires a neutron to be bombarded into it to undergo fission because

1. The energy of U-235 increases due to collision with the incoming neutron
2. The U-235 nucleus absorbs the neutron and becomes U-236 which is highly unstable
3. The neutron due to its high energy breaks apart the nucleus
4. None of the above.

Q. Which of the following is the major reason of a self-sustained chain reaction of U-235 fission?

1. High instability of U-235 isotope.
2. High instability of U-236 isotope
3. A neutron is required to trigger the fission of U-235 and after each fission neutrons are created, which trigger another reaction.
4. A neutron is required to trigger the fission of U-235 and we continuously bombard the neutron on the fuel sample.

Q. Which of the following is the major reason of a self-sustained chain reaction of U-235 fission?

1. High instability of U-235 isotope.
2. High instability of U-236 isotope
3. A neutron is required to trigger the fission of U-235 and after each fission neutrons are created, which trigger another reaction.
4. A neutron is required to trigger the fission of U-235 and we continuously bombard the neutron on the fuel sample.

Q. ____________ is the principle reaction responsible for the energy output of the Sun.

1. Gamma decay
2. Nuclear fusion
3. Alpha decay
4. Positron emission