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Question (21)

QN00681

A student notices that the image becomes dim in a pinhole camera. Which change would increase brightness?

(A) Make the hole slightly bigger
(B) Close the pinhole completely
(C) Increase box darkness only
(D) Use rough paper screen

Correct Answer: A

Explanation:

A larger hole allows more light to enter.

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Question (22)

QN00682

The image formed by a pinhole camera is inverted because

(A) light bends downward
(B) light rays cross at the pinhole
(C) mirrors reverse the image
(D) the screen rotates the image

Correct Answer: B

Explanation:

Crossing of rays causes inversion.

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Question (23)

QN00683

Which condition is necessary for obtaining a clear image in a pinhole camera?

(A) Large opening
(B) Transparent box
(C) Small pinhole
(D) Curved screen

Correct Answer: C

Explanation:

Small pinholes produce sharper images.

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Question (24)

QN00684

A student places two candles of different heights before a pinhole camera. The taller candle will form an image that is

(A) shorter than the other image
(B) same height as the smaller candle image
(C) taller than the other image
(D) invisible

Correct Answer: C

Explanation:

Taller objects form taller images.

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Question (25)

QN00685

During a solar eclipse, people sometimes use a pinhole camera mainly to

(A) magnify the Sun greatly
(B) safely observe the Sun’s image
(C) produce coloured shadows
(D) reflect sunlight directly

Correct Answer: B

Explanation:

Pinhole cameras allow safe eclipse viewing.

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Question (26)

QN00686

Which statement about the image in a pinhole camera is correct?

(A) It is virtual and erect
(B) It is real and inverted
(C) It is always magnified
(D) It cannot be seen on a screen

Correct Answer: B

Explanation:

Pinhole camera images are real and inverted.

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Question (27)

QN00687

If the object moves closer to a pinhole camera, the image formed generally becomes

(A) smaller
(B) brighter only
(C) larger
(D) upright

Correct Answer: C

Explanation:

Closer objects form larger images.

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Question (28)

QN00688

Ancient observations of sunlight passing through small holes helped scientists understand

(A) sound reflection
(B) straight-line propagation of light
(C) magnetic force
(D) heat conduction

Correct Answer: B

Explanation:

Pinhole effects show rectilinear propagation of light.

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Question (29)

QN00689

A pinhole camera made using black paper gives better results because black colour

(A) reflects more light
(B) absorbs unwanted light
(C) enlarges the image
(D) produces sharper shadows

Correct Answer: B

Explanation:

Black surfaces reduce internal reflections.

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Question (30)

QN00690

Which application of pinhole cameras is connected to science and society?

(A) Safe viewing of eclipses
(B) Measuring sound intensity
(C) Producing electric current
(D) Detecting magnetic poles

Correct Answer: A

Explanation:

Pinhole cameras are used for safe eclipse observation.

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Question (21)

A student notices that the image becomes dim in a pinhole camera. Which change would increase brightness?

Explanation:

Link:

Question (22)

The image formed by a pinhole camera is inverted because

Explanation:

Link:

Question (23)

Which condition is necessary for obtaining a clear image in a pinhole camera?

Explanation:

Link:

Question (24)

A student places two candles of different heights before a pinhole camera. The taller candle will form an image that is

Explanation:

Link:

Question (25)

During a solar eclipse, people sometimes use a pinhole camera mainly to

Explanation:

Link:

Question (26)

Which statement about the image in a pinhole camera is correct?

Explanation:

Link:

Question (27)

If the object moves closer to a pinhole camera, the image formed generally becomes

Explanation:

Link:

Question (28)

Ancient observations of sunlight passing through small holes helped scientists understand

Explanation:

Link:

Question (29)

A pinhole camera made using black paper gives better results because black colour

Explanation:

Link:

Question (30)

Which application of pinhole cameras is connected to science and society?

Explanation:

Link:

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