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Physics MCQs for NEET — Practice Questions with Answers

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In the nuclear reaction ${}_{92}U_{238} \to {}_{z}{Th}_{A} + {}_{2}{He}_{4}$ , the values of A and Z are

A = 234, Z = 94

A = 234, Z = 90

A = 238, Z = 94

A = 238, Z = 90

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Explanation

(b) A = 238 – 4 = 234 and Z = 92 – 2 = 90.

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If 200 MeV energy is released in the fission of a single $U^{235}$ nucleus, the number of fissions required per second to produce 1 kilowatt power shall be (Given $1 eV = 1.6 \times 10^{- 19} J$ )

$3.125 \times 10^{13}$

$3.125 \times 10^{14}$

$3.125 \times 10^{15}$

$3.125 \times 10^{16}$

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Explanation

(a) $P = n (\frac{E}{t}) \Rightarrow 1000 = \frac{n \times 200 \times 10^{6} \times 1.6 \times 10^{- 19}}{t} \Rightarrow \frac{n}{t} = 3.125 \times 10^{13}$

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In nuclear fission, the fission reactions proceeds with a projectile. Which of the following suits the best

Slow proton

Fast neutron

Slow neutron

None of these

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Explanation

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In the nuclear reaction ${}_{85}X_{297} \to Y + 4 α$ , Y is

${}_{76}Y_{287}$

${}_{77}Y_{285}$

${}_{77}Y_{281}$

${}_{77}Y_{289}$

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Explanation

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Thermal neutrons can cause fission in

$U^{235}$

$U^{238}$

${Pu}^{238}$

${Th}^{232}$

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Explanation

(a) For nuclei containing an even no. of electrons, fission can only occur if the incident neutrons have energy above about 1 MeV.

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In the nuclear reaction ${}_{6}C_{11} \to {}_{5}B_{11} + β^{+} + X$ , what does X stand for

An electron

A proton

A neutron

A neutrino

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Explanation

(d) ${}_{6}C_{11} \to {}_{5}B_{11} + β^{+} + γ$ because $β^{+} = {}_{1}e_{0}$

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When neutrons are bombarded on nucleus of ${}_{92}U_{235}$ , the number of emitted neutrons will be

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Explanation

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The energy released in a typical nuclear fusion reaction is approximately

25 MeV

200 MeV

800 MeV

1050 MeV

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Explanation

(a)

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Which one of the following nuclear reactions is a source of energy in the sun

${}_{4}^{9}{Be} + {}_{2}^{4}{He} \to {}_{6}^{12}C + {}_{0}^{- 1}n$

${}_{2}^{3}{He} + {}_{2}^{3}{He} \to {}_{2}^{4}H + {}_{1}^{1}H + {}_{1}^{1}H$

${}_{56}^{144}{Ba} + {}_{56}^{92}{Kr} \to {}_{92}^{235}U + {}_{0}^{- 1}n$

${}_{26}^{56}{Fe} + {}_{48}^{112}{Ca} \to {}_{74}^{167}W + {}_{0}^{- 1}n$

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Explanation

(b) Energy is released in the sun due to fusion.

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${}_{1}^{1}H + {}_{1}^{1}H + {}_{1}^{2}H \to X + {}_{1}^{0}e$ energy. The emitted particle is [CPMT 1996]

Neutron

Proton

$α$ particle

Neutrino

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Explanation

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