Unit 20: Electromagnetic Waves + Unit 21: Nuclear Physics

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1. Medical tracers commonly use:

A Stable isotopes

B Radioisotopes

C Electrons

D Neutrons

2. Dark matter is called dark because it:

A Is black in color

B Does not emit light

C Is far away

D Is very hot

3. Which element is commonly used as fuel in nuclear reactors?

A Carbon

B Uranium-235

C Hydrogen

D Oxygen

4. Light is considered a wave because it shows

A Reflection only

B Diffraction and interference

C Refraction only

D Absorption only

5. Why clouds appear white?

A Due to absorption

B Due to reflection of blue light

C Due to scattering of all wavelengths

D Due to refraction

6. The speed of electromagnetic waves in vacuum is

A 3 × 10^6 m/s

B 3 × 10^7 m/s

C 3 × 10^8 m/s

D 3 × 10^9 m/s

7. Which law explains energy release in nuclear reactions?

A Ohm’s law

B Newton’s law

C Einstein’s mass-energy relation

D Boyle’s law

8. Control rods in a nuclear reactor absorb:

A Protons

B Electrons

C Neutrons

D Gamma rays

9. The main source of energy of the Sun is:

A Nuclear fission

B Chemical reaction

C Nuclear fusion

D Radioactivity

10. Which electromagnetic wave carries the least energy?

A Gamma rays

B X-rays

C Infrared rays

D Radio waves

Unit 20: Electromagnetic Waves + Unit 21: Nuclear Physics

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