NCERT Science Class 10 Chapter 11 The Human Eye and the colourful world CBSE Board Sample Problems Multiple Choice Question

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Question

The focal length of the eye lens increases when eye muscles.

1. Are relaxed and lens becomes thinner

2. Contract and lens becomes thicker

3. Are relaxed and lens becomes thicker

4. Contract and lens becomes thinner.

Question

Which of the following phenomenon contributes significantly to the reddish appearance of the sun at sunrise or sunset?

1. Dispersion of light

2. Scattering of light

3. Total internal Reflection

4. Reflection of light from the earth

Question

When a person is myopic, he/ she can clearly see

1. Both nearby and far off objects

2. Only nearby objects

3. Only far off objects

4. Neither nearby nor far off objects

Question

The phenomena of light responsible for the working of the human eye is

1. Reflection

2. Refraction

3. Power of accommodation

4. Persistence of vision

Question

The persistence of vision for human eye is

1. 1/lath of a second

2. 1/16th of a second

3. 1/6th of a second

4. 1/18th of a second

Question

A person is using a concave lens for his clear vision. Then he must be suffering from

1. Myopia

2. Hypermetropia

3. Presbyopia

4. None of the above

Question

At noon sky appears white

1. All colours get scattered equally

2. Blue colour scatters the most

3. Red colour scatters the most

4. Light is least scattered

Question

A prism causes

1. Only dispersion

2. Neither deviation nor deviation

3. Both dispersion and dispersion

4. Only deviation

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: The image distance in the eye increases, when we increase the distance of an object from the eye.

Reason: For a normal eye, image in distance in the eye is fixed, being equal to distance of retina from the eye lens. The focal length of the eye lens is changed on account of accommodation power of the eye.

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.