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Speed of Light Physics - Speed of Light

Uttarakhand Board (UBSE) - STD 11 Science - Physics (Uttarakhand - English Medium). 14 questions in this chapter.

Question types

Speed of Light question types

14 questions across 4 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.

14
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4
Question groups
5
Question types
Sample Questions

Speed of Light questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 11 Marks Question1 Mark
Which of the following methods can be used to measure the speed of light in laboratory?
  • A
    Roemer method.
  • B
    Fizeau method.
  • ✓
    Focault method.
  • D
    Michelson method.

Answer: C.

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Q 21 Marks Question1 Mark
Which of the following methods can be used to measure the speed of light in water?
  • A
    Roemer method.
  • B
    Fizeau method.
  • ✓
    Focault method.
  • D
    Michelson method.

Answer: C.

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Q 31 Marks Question1 Mark
Light passes through a closed cylindrical tube containing a gas. If the gas is gradually pumped out, the speed of light inside the tube will:
  • ✓
    Increase.
  • B
    Decrease.
  • C
    Remain constant.
  • D
    First increase and then decrease.

Answer: A.

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Q 41 Marks Question1 Mark
The speed of light is $299,792,458\ m/s.$
  1. With respect to the earth.
  2. With respect to the sun.
  3. With respect to a train moving on the earth.
  4. With respect to a spaceship going in outer space.
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Q 51 Marks Question1 Mark
The speeds of red light and yellow light are exactly same:
  • ✓
    In vacuum but not in air.
  • B
    In air but not in vacuum.
  • C
    In vacuum as well as in air.
  • D
    Neither in vacuum nor in air.

Answer: A.

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Q 72 Marks Questions2 Marks
In a Michelson experiment for measuring speed of light, the distance travelled by light between two reflections from the rotating mirror is 4.8km. The rotating mirror has a shape of a regular octagon. At what minimum angular speed of the mirror (other than zero) the image is formed at the position where a non-rotating mirror forms it?
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Q 83 Marks Question3 Marks
In Fizeau method of measuring the speed of light, the toothed wheel is placed in the focal plane of a converging lens. How would the experiment be affected if the wheel is slightly away from the focal plane?
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Q 113 Marks Question3 Marks
Consider Galileo's method of measuring the speed of light using two lanterns. To get an accuracy of about 10%, the time taken by the experimenter in closing or opening the shutter should be about one tenth of the time taken by the light in going from one experimenter to the other. Assume that it takes $\frac{1}{100}$ second for an experimenter to close or open the shutter. How far should the two experimenters be to get a 10% accuracy? What are the difficulties in having this separation?
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Q 125 Marks Questions5 Marks
In an experiment with Foucault's apparatus, the various distances used are as follows:
Distance between the rotating and the fixed mirror = 16m
Distance between the lens and the rotating mirror = 6m
Distance between the source and the lens = 2m
When the mirror is rotated at a speed of 356 revolutions per second, the image shifts by 0.7mm. Calculate the speed of light from these data.
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Q 135 Marks Questions5 Marks
In an experiment to measure the speed of light by Fizeau's apparatus, following data are used:
Distance between the mirrors = $12.0km$,
Number of teeth in the wheel =$180$.
Find the minimum angular speed of the wheel for which the image is not seen.
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