NCERT Science Class 10 Chapter 10 Light Reflection and Refraction CBSE Board Sample Problems Multiple Choice Question

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Question

The power of a lens ¡s -4.0 D. what is the nature of the lens?

1. Plane

2. Concave

3. Convex

4. Plano convex

Question

An object is kept at a distance more than twice the focal length (F) from a concave mirror. The distance the image formed will be

1. Less then F

2. Equal to F

3. Between F and 2F

4. More than 2 F

Question

In order to determine the focal length of a concave mirror by obtaining the image of distant object on screen, the position of screen should be

1. Parallel to plane of concave mirror

2. Perpendicular to plane of concave mirror

3. Inclined at an angle 600 to plane of mirror

4. In any direction with respect to the plane of concave mirror

Question

A small electric lamp is placed at the focus of a convex lens. When the lamp is switched on, the lens will produce:

1. Converging beam of light

2. Parallel beam of light

3. Diverging beam of light

4. Diffused beam of light

Question

What is the focal length of a glass slab?

1. 0

2. Infinite

3. 1

4. Vary from 0 to 1

Question

An object is placed at the center of curvature of a concave mirror. The distance between image and pole is:

1. Equal to f

2. Equal to 2f

3. Greater than f but less than 2f

4. Greater than 2f

Question

No matter how far you stand from this spherical mirror, your image always appear erect. The mirror may be:

1. Either plane or convex

2. Plane

3. Convex

4. Concave

Question

In each of the following questions, a statement of Assertion is given by the corresponding of Reason. Of the statements, marks the correct answer as

Assertion: When a concave mirror is held under water, its focal length will increase.

Reason: The focal length of a concave mirror is independent of the medium in which ¡t is placed.

1. If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

2. If both Assertion and Reason are true and Reason is not the correct explanation of Assertion.

3. If Assertion is true, but Reason is false.

4. If Assertion is false, but Reason is true.