Introduction to Nuclear Fission

Q. The number of neutrons emitted when ${}_{92}^{235}U$ undergoes controlled nuclear fission to ${}_{54}^{142}Xe$ and ${}_{38}^{90}Sr$ is ___

Q.

Assertion : Nuclear fission is always accompanied by release of energy.
Reason : Nuclear fission is a chain process.

1. If both assertion and reason are true and the reason is the correct explanation of the assertion.
2. If both assertion and reason are true but reason is not the correct explanation of the assertion.
3. If assertion is true but reason is false.
4. If the assertion and reason both are false.
5. If assertion is false but reason is true.

Q. The periodic table consists of 18 groups. An isotope of copper, on bombardment with protons, undergoes a nuclear reaction yielding element X as shown below. To which group, element X belongs in the periodic table?___
${}_{29}^{63}Cu{+}_1^{1}H\to 6_0^{1}n{+}_2^4\alpha +2_1^{1}H+X$

Q. A hypothetical nuclear fission takes place as following:
${}_{92}^{236}X{\to }_{56}^{140}Y{+}_{36}^{94}Y+neutron\left(s\right)$
How many neutrons will get emitted in the process?

1. 1
2. 2
3. 3
4. 4

Q. If uranium (mass number 238 and atomic number 92) emits an $\alpha -$ particle, the product has mass number and atomic number:

1. 238 and 90
2. 234 and 90
3. 236 and 90
4. 236 and 92