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- 1. Multiple Choice
How many electrons are contained in 23892U nucleus?
92
146
238
0
- 2. Multiple Choice
Chadwick was awarded the Nobel prize in Physics in 1935 for his discovery of:
electron
neutron
proton
none of these
- 3. Multiple Choice
The density of a nucleus is of the order of:
1015 kg m-3
1015 kg m-3
1015 kg m-3
1017 kg m-3
- 4. Multiple Choice
Nuclear force is:
strong, short range and charge independent force
charge independent, attractive and long range force
strong, charge dependent and short range attractive force
long range, change dependent and attractive force
- 5. Multiple Choice
Fusion takes place at high temperature because:
Atom are ionised at high temperature
Molecules break up at high temperature
Nuclei break up at high temperature
Kinetic energy is high enough to overcome repulsion between nuclei
- 6. Multiple Choice
The helium atom does not contain:
two protons
two electrons
two neutrons
six nucleons
- 7. Multiple Choice
The mass number of a nucleus is A and its atomic number is Z. The number of neutrons in the nucleus is :
A – Z
A +Z
A
Z
- 8. Multiple Choice
Ratio of the radii of the nuclei with mass numbers 8 and 27 will be:
1:1
27:8
2:3
4:9
- 9. Multiple Choice
Light energy emitted by star is due to:
breaking of nuclei
joining of nuclei
burning of nuclei
reflection of solar light
- 10. Multiple Choice
Sun’s radiant energy is due to:
nuclear fission
nuclear fusion
photoelectric effect
spontaneous radioactive decay
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