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Question (11)

QN00701

A submarine uses a periscope mainly to

(A) measure water pressure
(B) observe objects above water surface
(C) produce electricity
(D) detect sound waves

Correct Answer: B

Explanation:

Periscopes allow viewing above the water.

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Question (12)

QN00702

Which type of image is commonly seen in a kaleidoscope?

(A) Real image
(B) Virtual repeated patterns
(C) Enlarged real image
(D) Shadow image

Correct Answer: B

Explanation:

Kaleidoscopes form repeated virtual patterns.

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Question (13)

QN00703

A student making a kaleidoscope should use mirrors with surfaces that are

(A) rough and dark
(B) smooth and polished
(C) transparent and curved
(D) porous and thick

Correct Answer: B

Explanation:

Smooth polished mirrors give clear reflections.

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Question (14)

QN00704

Why is cardboard commonly used for making the outer body of a periscope?

(A) It reflects light strongly
(B) It is opaque and lightweight
(C) It bends light rays
(D) It produces coloured images

Correct Answer: B

Explanation:

Cardboard is easy to use and blocks outside light.

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Question (15)

QN00705

Which useful item demonstrates multiple reflections most clearly?

(A) Torch
(B) Kaleidoscope
(C) Spectacles
(D) Magnifying glass

Correct Answer: B

Explanation:

Kaleidoscopes use repeated reflections.

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Question (16)

QN00706

In a simple periscope, mirrors are usually placed at an angle of

(A) 30°
(B) 45°
(C) 60°
(D) 90°

Correct Answer: B

Explanation:

Mirrors are kept at 45° for proper reflection.

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Question (17)

QN00707

A child looking through a periscope can see over a wall because light rays

(A) bend through water
(B) are reflected by mirrors
(C) pass through opaque objects
(D) get absorbed in glass

Correct Answer: B

Explanation:

Mirrors reflect light into the viewer’s eyes.

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Question (18)

QN00708

Which feature of a kaleidoscope makes every pattern appear symmetrical?

(A) Absorption of light
(B) Refraction through water
(C) Repeated reflection from mirrors
(D) Shadow overlap

Correct Answer: C

Explanation:

Multiple reflections produce symmetry.

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Question (19)

QN00709

A periscope used by soldiers helps them

(A) hear distant sounds
(B) observe safely from hidden positions
(C) increase body temperature
(D) detect magnetic poles

Correct Answer: B

Explanation:

Soldiers can observe without exposing themselves.

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Question (20)

QN00710

Which of the following is necessary for making a simple kaleidoscope?

(A) Concave lens
(B) Plane mirrors
(C) Convex mirror
(D) Water prism

Correct Answer: B

Explanation:

Plane mirrors are essential for kaleidoscopes.

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Question (11)

A submarine uses a periscope mainly to

Explanation:

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Question (12)

Which type of image is commonly seen in a kaleidoscope?

Explanation:

Link:

Question (13)

A student making a kaleidoscope should use mirrors with surfaces that are

Explanation:

Link:

Question (14)

Why is cardboard commonly used for making the outer body of a periscope?

Explanation:

Link:

Question (15)

Which useful item demonstrates multiple reflections most clearly?

Explanation:

Link:

Question (16)

In a simple periscope, mirrors are usually placed at an angle of

Explanation:

Link:

Question (17)

A child looking through a periscope can see over a wall because light rays

Explanation:

Link:

Question (18)

Which feature of a kaleidoscope makes every pattern appear symmetrical?

Explanation:

Link:

Question (19)

A periscope used by soldiers helps them

Explanation:

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Question (20)

Which of the following is necessary for making a simple kaleidoscope?

Explanation:

Link:

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