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Question 11 Mark

Fill in the following blanks with suitable words: A person $1m$ in front of a plane mirror seems to be $............m$ away from his image.

Answer

A person $1m$ in front of a plane mirror seems to be $2m$ away from his image.
Explanation: Image formed by a plane mirror is far behind the mirror as the object is in front of the mirror.

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Question 21 Mark

Fill in the following blanks with suitable words:
In a movie, the still pictures in proper sequence are projected on the screen usually at the rate of $............$ pictures per second.

Answer

In a movie, the still pictures in proper sequence are projected on the screen usually at the rate of $24$ pictures per second.
Explanation:
The frame rate for motion pictures is 24 pictures per second. Frame rate is the rate at which consecutive images are displayed in a display.

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Question 31 Mark

Fill in the following blanks with suitable words:
Night birds have $............$ cones than rods in their eyes.

Answer

Night birds have Fewer cones than rods in their eyes.
Explanation:
Night birds have fewer cones and more rods because rods function in less amount of light. Cones function in bright light.

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Question 41 Mark

Fill in the following blanks with suitable words:
The image of an object persists on the retina of an eye for about $............$ second even after the object has disappeared.

Answer

The image of an object persists on the retina of an eye for about $\frac1{16}^{th}$ second even after the object has disappeared.
Explanation:
The phenomenon is known as Persistence of Vision. The property of this phenomenon is that the image formed on the retina of the eye persists for about $\frac1{16}^{th}$ of a second even after the object has disappeared.

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Question 51 Mark

Fill in the following blanks with suitable words: The angle of $............$ equals the angle of reflection.

Answer

The angle of Incidence equals the angle of reflection.
Explanation: This is by law of reflection. The angle of incidence equals the angle of reflection.

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Question 61 Mark

Fill in the following blanks with suitable words: The size of pupil becomes $............$ when you see in dim light.

Answer

The size of pupil becomes Large when you see in dim light.
Explanation:
The size of pupil dilates, facilitated by the iris, so that maximum amount of possible light enters the eye and a person views things clearly.

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Question 71 Mark

Fill in the following blanks with suitable words: If you touch your $............$ ear with right hand in front of a plane mirror, it will be seen in the mirror that your right ear is touched with $............$

Answer

If you touch your Left ear ear with right hand in front of a plane mirror, it will be seen in the mirror that your right ear is touched with left hand.
Explanation: Images formed by a plane mirror are opposite in direction.

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Question 81 Mark

Fill in the following blanks with suitable words: If the still pictures of a moving object are flashed on our eyes at a rate faster than $............$ pictures per second, the eye perceives the object as moving.

Answer

If the still pictures of a moving object are flashed on our eyes at a rate faster than $16$ pictures per second, the eye perceives the object as moving.
Explanation:
The is due to the phenomenon Persistence of Vision. The property of this phenomenon is that the image formed on the retina of the eye persists for about $\frac1{16}^{th}$ of a second, hence if 16 frames are flashed in front of the eyes, they are viewed by the retina as an ongoing action.

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