جوہری اور مرکزی طبیعیات

Written by Dr. Hamza Farooq (Physics)

دسویں جماعت · طبیعیات · 9 سوالات

نام: ____________________ تاریخ: ____________

Which radiation is the most penetrating?
- A All equal
- B Gamma
- C Alpha
- D Beta
An alpha particle is the same as a:
- A Hydrogen nucleus
- B Helium nucleus
- C Neutron
- D Electron
A sample has a half life of 4 days. What fraction remains after 12 days?
- A 1/16
- B 1/8
- C 1/4
- D 1/2
The splitting of a heavy nucleus into lighter nuclei is called:
- A Fission
- B Fusion
- C Ionisation
- D Evaporation
The energy of the Sun comes from nuclear:
- A Fusion
- B Fission
- C Combustion
- D Decay only
A device used to detect radiation is the:
- A Thermometer
- B Voltmeter
- C Barometer
- D Geiger Muller counter
Which radiation is stopped by a sheet of paper?
- A Beta
- B X rays
- C Alpha
- D Gamma
Carbon-14 is used for:
- A Cooling
- B Making steel
- C Lighting
- D Dating ancient objects
Radioactive decay is a:
- A Process that needs light
- B Random process
- C Process we can start at will
- D Chemical reaction

جوابی کلید

1. B, 2. B, 3. B, 4. A, 5. A, 6. D, 7. C, 8. D, 9. B

Gamma rays pass through most materials and need thick lead or concrete to stop them.
An alpha particle is two protons and two neutrons, a helium nucleus.
12 days is 3 half lives, so (1/2)³ = 1/8.
This is nuclear fission, as in a nuclear power plant.
Hydrogen nuclei fuse to form helium in the Sun.
It clicks when radiation passes through.
Alpha particles are easily stopped.
Its half life lets us date organic remains.
We cannot predict when a single nucleus will decay.