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NDA Physics quiz Optics
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NDA Physics quiz Optics
Quiz
Question 1. The speed of light is maximum in:
Glass
Water
Diamond
Vacuum
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Question 2. The bending of light when it passes from one medium to another is called:
Reflection
Diffraction
Refraction
Dispersion
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Question 3. The focal length of a convex lens is:
Negative
Positive
Zero
Infinite
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Question 4. Which lens is used to correct short-sightedness (myopia)?
Convex lens
Concave lens
Cylindrical lens
Plano-convex lens
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Question 5. Which mirror is used in vehicle headlights?
Convex mirror
Concave mirror
Plane mirror
Spherical mirror
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Question 6. The unit of power of a lens is:
Joule
Meter
Candela
Dioptre D
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Question 7. Which phenomenon is responsible for the formation of a rainbow?
Reflection of light
Dispersion of light
Interference of light
Diffraction of light
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Question 8. The image formed by a plane mirror is always:
Real and inverted
Real and erect
Virtual and erect
Diminished
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Question 9. The phenomenon of light bending around corners of small obstacles is called:
Refraction
Diffraction
Polarization
Scattering
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Question 10. The colour of the sky appears blue due to:
Dispersion of light
Reflection of light
Scattering of light
Refraction of light
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Question 11. The escape velocity of Earth is nearly:
9.8 km/s
8.9 km/s
11.2 km/s
13.6 km/s
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Question 12. The force that keeps planets in their orbits around the Sun is:
Magnetic force
Nuclear force
Gravitational force
Electrostatic force
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Question 13. Kepler’s first law of planetary motion states that planets move around the Sun in:
Circular orbits
Elliptical orbits with the Sun at one focus
Parabolic orbits
Straight lines
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