In a radioactive substance at t = 0, the number of atoms is 8×104, its half-life period is 3 yr. the number of atoms 1×104 will remain after interval [UP CPMT 2010]

(1) 9 yr              (2) 8 yr              (3) 6 yr             (4) 24 yr

Subtopic:  Radioactivity (OLD NCERT) |
 83%
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PMT - 2010
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What is the respective number of α and β-particles emitted in the following radioactive decay?
\(X^{200}_{90}\rightarrow Y^{168}_{80}\)

1. 6 and 8 2. 6 and 6
3. 8 and 8 4. 8 and 6   
Subtopic:  Types of Decay |
 84%
From NCERT
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A nucleus Xmn emits one α and two β-particles. The resulting nucleus is

(1) Xm-4n         (2) Ym-4n-2           (3) Zm-4n-4            (4) None of these

Subtopic:  Types of Decay |
 69%
From NCERT
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The half-life period of a radioactive substance is 6 h.  After 24 h activity is 0.01 μCi, what was the initial activity? 

(1) 0.04 μCi         (2) 0.08 μCi           (3) 0.24 μCi              (4) 0.16 μCi

Subtopic:  Radioactivity (OLD NCERT) |
 73%
From NCERT
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The relationship between disintegration constant λ and half-life [T] will be:

(1) λ=log10 2T                    (2) λ=loge 2T

(3) λ=Tloge 2                      (4) λ=log2 eT

Subtopic:  Radioactivity (OLD NCERT) |
 78%
From NCERT
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If the nuclear force between two protons, two neutrons and between proton and neutron is denoted by Fpp, Fnn and Fpn respectively, then [1991]

(1) FppFnnFpn

(2) FppFnn and Fpp=Fnn

(3) Fpp=Fnn=Fpn

(4) FppFnnFpn

Subtopic:  Nuclear Binding Energy |
From NCERT
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In a given reaction,

XAZYAZ+1KA-4Z-1KA-4Z-1

Radioactive radiations are emitted in the sequence of  

(1)  α, β, γ       (2) γ, α, β             (3) β, α, γ            (4) γ, β, α

Subtopic:  Radioactivity (OLD NCERT) | Types of Decay |
 91%
From NCERT
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If a proton and anti-proton come close to each other and annihilate, how much energy will be released?

1. \(1.5 \times10^{-10}~\text{J}\) 2. \(3 \times10^{-10}~\text{J}\)
3. \(4.5 \times10^{-10}~\text{J}\) 4. None of these
Subtopic:  Mass-Energy Equivalent |
 54%
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Heavy water is used as a moderator in a nuclear reactor. The function of the moderator is 

(1) to control energy released in the reactor

(2) to absorb neutrons and stop the chain reaction

(3) to cool the reactor

(4) to slow down the neutrons to thermal energies

Subtopic:  Nuclear Energy |
 69%
From NCERT
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The binding energy per nucleon of deuterium and helium atom is 1.1 MeV and 7.0 MeV. If two deuterium nuclei fuse to form a helium atom, the energy released is 

(1) 19.2 MeV            (2) 23.6 MeV             (3) 26.9 MeV                (4) 13.9 MeV

Subtopic:  Nuclear Binding Energy |
 76%
From NCERT
PMT - 2001
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