NEET Previous Year Questions on Nuclei – Physics Chapter-wise

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Topic Question Set

Q 1 :
Water is used as a coolant in a nuclear reactor because of its [2024]

high thermal expansion coefficient
high specific heat capacity
low density
low boiling point

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(2)

Water is used as a coolant in a nuclear reactor because of its high specific heat capacity.

Q 2 :
Select the correct statements among the following:
A. Slow neutrons can cause fission in ${}_{92}^{235}U$ than fast neutrons.
B. $α$ -rays are helium nuclei.
C. $β$ -rays are fast moving electrons or positrons.
D. $γ$ -rays are electromagnetic radiations of wavelengths larger than X-rays.

Choose the most appropriate answer from the options given below: [2024]

A, B and C only
A, B and D only
A and B only
C and D only

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Slow neutrons spend more time close to ${}_{92}^{235}U$ while passing as compared to fast neutrons.

$α$ -rays are helium nuclei ${}_{2}^{4}H$ .

$β$ -rays are fast moving electrons or positrons.

$γ$ -rays are electromagnetic radiations of wavelength smaller than X-rays.

So, statements A, B and C are correct.

Q 3 :
When a uranium isotope ${}_{92}^{235}U$ is bombarded with a neutron, it generates ${}_{36}^{89}{Kr}$ , three neutrons and [2020]

${}_{56}^{144}{Ba}$
${}_{40}^{91}{Zr}$
${}_{36}^{101}{Kr}$
${}_{36}^{103}{Kr}$

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${}_{92}{U^{235}} + {}_{0}{n^{1}} ⟶ {}_{36}{Kr}^{89} + 3 n_{0}^{1} + {}_{Z}{X^{A}}$

$92 + 0 = 36 + Z \Rightarrow Z = 56$

Now, $235 + 1 = 89 + 3 + A \Rightarrow A = 144$

So, ${}_{56}{Ba}^{144}$ is generated.

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