R4RIN – MCQs, Mock Tests | Physics G.K Question and Answer

In the case of a concave mirror, the image of an object is

1. Real, erect and diminished when the object lies beyond the centre of curvature.
2. Real, inverted and of the same size as the object when it lies between the centre of curvature and focus.
3. Real, inverted and diminished when the object lies beyond the centre of curvature.
4. Not real, large and unproportional.

✅ Correct Answer: 3

To increase the magnifying power of a telescope, the focal length of

1. Objective lens should be increased.
2. Objective lens should be decreased.
3. Eye-piece lens should be increased.
4. Eye-piece lens should be decreased.

✅ Correct Answer: 4

Because the sunlight falling on it is reflected.

1. Because the sunlight falling on it is reflected.
2. Because the sunlight falling on it is refracted.
3. Because the sunlight falling on it is absorbed.
4. Because the sunlight falling on it is scattered.

✅ Correct Answer: 4

What is the power of concave lens?

1. Positive
2. Negative
3. Both
4. None of the above

✅ Correct Answer: 2

Which glasses or lens are used to correct the short sighted eye defect?

1. Concave Lens
2. Convex Lens
3. Bipolar Lens
4. None of the above

✅ Correct Answer: 1

In projectors which lenses are used?

1. Convex lens
2. Concave lens
3. Bipolar lens
4. Both (a) and (b)

✅ Correct Answer: 1

Due to which phenomena the stick if immersed in water appears to be bent?

1. Reflection
2. Dispersion
3. Refraction
4. Scattering

✅ Correct Answer: 3

Due to which phenomena light rays emerging from a cinema machine spread wide on the screen?

1. Dispersion
2. Diffraction
3. Scattering
4. Refraction

✅ Correct Answer: 2

Dental mirror is what type of a mirror?

1. Convex mirror
2. Concave mirror
3. Plane mirror
4. Both (b) and (c)

✅ Correct Answer: 4

What type of a mirror is used in anti-shop-lifting-devices?

1. Concave mirror
2. Convex mirror
3. Plane mirror
4. None of the above

✅ Correct Answer: 2

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G.K Question and Answer - Physics Set VIII