If an electron and a positron annihilate, then the energy released is:

1. 3.2×10-13 J       

2. 1.6×10-13 J

3. 4.8×10-13 J           

4. 6.4×10-13 J

Subtopic:  Mass-Energy Equivalent |
 63%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Fission of nuclei is possible because the binding energy per nucleon in them:

1. increases with mass number at high mass numbers.
2. decreases with mass number at high mass numbers.
3. increases with mass number at low mass numbers.
4. decreases with mass number at low mass numbers.

Subtopic:  Nuclear Binding Energy |
 58%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Ne1022 nucleus after absorbing energy decays into two \(\alpha- \text{particle}\) and an unknown nucleus. The unknown nucleus is:

1. Nitrogen

2. Carbon

3. Boron                 

4. Oxygen

Subtopic:  Types of Decay |
 70%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

An atomic nucleus Th90232 emits several α and β radiations and finally reduces to Pb82208. It must have emitted:
1. 4α and 2β             
2. 6α and 4β
3. 8α and 24β           
4. 4α and 16β

Subtopic:  Types of Decay |
 83%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

During negative β-decay:

1. a neutron converts into proton.
2. a proton converts into neutron.
3. neutron to proton ratio increases.
4. None of these

Subtopic:  Types of Decay |
 74%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

In nuclear reaction He24+XZAYZ+2A+3+B, \(\mathrm {B}\) denotes:

1. Electron           

2. Positron

3. Proton               

4. Neutron

Subtopic:  Types of Decay |
 63%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

The mass of an α-particle is:

1. less than the sum of masses of two protons and two neutrons.
2. equal to the mass of four protons.
3. equal to the mass of four neutrons.
4. equal to the sum of masses of two protons and two neutrons.
Subtopic:  Nuclear Binding Energy |
 56%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The rest energy of an electron is:

1. 510 KeV 2. 931 KeV
3. 510 MeV 4. 931 MeV
Subtopic:  Mass-Energy Equivalent |
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The Binding energy per nucleon of \(^{7}_{3}\mathrm{Li}\) and \(^{4}_{2}\mathrm{He}\) nucleon are \(5.60~\text{MeV}\) and \(7.06~\text{MeV}\), respectively. In the nuclear reaction \(^{7}_{3}\mathrm{Li} + ^{1}_{1}\mathrm{H} \rightarrow ^{4}_{2}\mathrm{He} + ^{4}_{2}\mathrm{He} +Q\), the value of energy \(Q\) released is:
1. \(19.6~\text{MeV}\)
2. \(-2.4~\text{MeV}\)
3. \(8.4~\text{MeV}\)
4. \(17.3~\text{MeV}\)

Subtopic:  Nuclear Binding Energy |
 65%
From NCERT
AIPMT - 2014
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

A nucleus \({ }_{{n}}^{{m}} {X}\) emits one \(\alpha\text -\text{particle}\) and two \(\beta\text- \text{particle}\) The resulting nucleus is:
1. \(^{m-}{}_n^6 Z \)
2. \(^{m-}{}_{n}^{4} X \)
3. \(^{m-4}_{n-2}Y\)
4. \(^{m-6}_{n-4} Z \)

Subtopic:  Types of Decay |
 81%
From NCERT
AIPMT - 2011
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch