Question : A light year is a measure of
Option 1: speed
Option 2: velocity
Option 3: distance
Option 4: time
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Correct Answer: distance
Solution : The correct answer is distance.
A light year is the measure of distance in interstellar space. It is the amount of distance a light ray can travel in one year. Light is used to measure astronomical distances because the speed of light is constant in a vacuum and it always travels in a straight line. The speed of light is 3 x 108 m/s.
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Question : Which of these travels in glass with minimum velocity?
Option 1: Red light
Option 2: Violet light
Option 3: Green light
Option 4: Yellow light
Question : An anemometer measures which of the following?
Option 1: Speed of light
Option 2: Speed of wind
Option 3: Speed of water current
Option 4: Speed of satellites
Question : White light is an example of:
Option 1: LASER light
Option 2: Plane polarised light
Option 3: Monochromatic light
Option 4: Polychromatic light
Question : A light wave is incident over a plane surface with velocity x. After reflection, the velocity becomes:
Option 1: x/2
Option 2: x
Option 3: 2x
Option 4: x/4
Question : Which of the following is not a vector quantity?
Option 1: Speed
Option 2: Velocity
Option 3: Torque
Option 4: Displacement
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