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1. The isotopes that emit ______ radiations are used as radioactive traces in medical science (NTSE Andhra Pradesh, Stage-I, 2012-13)
β-radiations
γ-radiations
α-radiations
All the three
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2. The electromagnetic radiations used for taking photographs of objects in dark (NTSE Andhra Pradesh, Stage-I, 2012-13)
X-rays
Infra-red rays
γ-rays
UV rays
3. The solar energy is due to the reactions of (NTSE West Bengal, Stage-I, 2013-14)
Nuclear fusion
Nuclear fission
Combination of nuclear fusion and fission
Chemical
4. One atomic mass unit (a.m.u) is equal to (NTSE West Bengal, Stage-I, 2013-14)
1 eV of energy
931 eV of energy
1 MeV of energy
931 MeV of energy
5. A uranium nucleus at rest decays into a thorium nucleus and a helium nucleus, as shown below. Which of the following is true? (NTSE Stage-II, 2012-13)
Each decay product has the same kinetic energy
The decay products tend to go in the same direction
The thorium nucleus has more momentum than the helium nucleus
The helium nucleus has more kinetic energy than the thorium nucleus
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