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Question (31)

QN002501

Which statement correctly defines a concave lens?

(A) A lens thicker at the middle than at the edges
(B) A lens thicker at the edges than at the middle
(C) A lens made only of glass
(D) A lens that converges light

Correct Answer: B

Explanation:

A concave lens is thinner at the centre.

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Question (32)

QN002502

A student uses a convex lens and notices that the image changes from enlarged to diminished as the object moves away. The image must have:

(A) Remained erect throughout
(B) Become inverted at some stage
(C) Remained same size throughout
(D) Disappeared permanently

Correct Answer: B

Explanation:

A convex lens changes from erect to inverted images as distance increases.

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Question (33)

QN002503

Which lens is most suitable for reading very small print?

(A) Concave lens
(B) Convex lens
(C) Plane glass
(D) Convex mirror

Correct Answer: B

Explanation:

A convex lens magnifies small objects.

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Question (34)

QN002504

A lens forms an image that is always smaller than the object regardless of distance. This identifies it as a:

(A) Convex lens
(B) Concave lens
(C) Plane glass
(D) Magnifying lens

Correct Answer: B

Explanation:

A concave lens always forms diminished images.

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Question (35)

QN002505

In the chapter, eyeglasses help people see clearly because they contain:

(A) Mirrors
(B) Magnets
(C) Lenses
(D) Prisms only

Correct Answer: C

Explanation:

Eyeglasses use lenses to correct vision.

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Question (36)

QN002506

Which observation from Activity 10.8 directly suggests that a water drop behaves like a lens?

(A) The water drop becomes coloured
(B) The letters appear larger beneath it
(C) The paper becomes wet
(D) The glass strip bends

Correct Answer: B

Explanation:

Magnification indicates lens-like behaviour.

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Question (37)

QN002507

A student places identical objects behind a convex lens and a concave lens at close distances. The convex lens image compared to the concave lens image will generally be:

(A) Smaller
(B) More enlarged
(C) Same size
(D) Invisible

Correct Answer: B

Explanation:

A convex lens can magnify nearby objects.

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Question (38)

QN002508

Which statement about lenses and light beams is correct?

(A) Convex lens diverges and concave lens converges light
(B) Both lenses diverge light
(C) Convex lens converges and concave lens diverges light
(D) Both lenses converge light

Correct Answer: C

Explanation:

Convex lenses converge while concave lenses diverge light.

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Question (39)

QN002509

Solar concentrators use mirrors and lenses mainly to:

(A) Produce sound
(B) Concentrate sunlight into a small area
(C) Block sunlight
(D) Create shadows

Correct Answer: B

Explanation:

Concentrated sunlight produces heat and energy.

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Question (40)

QN002510

Assertion: A convex lens is called a converging lens. Reason: Parallel beams of light come closer together after passing through it.

(A) Both Assertion and Reason are true, and Reason correctly explains Assertion.
(B) Both Assertion and Reason are true, but Reason does not explain Assertion.
(C) Assertion is true, Reason is false.
(D) Assertion is false, Reason is true.

Correct Answer: A

Explanation:

A convex lens converges parallel rays, hence it is called a converging lens.

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Question (31)

Which statement correctly defines a concave lens?

Explanation:

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Question (32)

A student uses a convex lens and notices that the image changes from enlarged to diminished as the object moves away. The image must have:

Explanation:

Link:

Question (33)

Which lens is most suitable for reading very small print?

Explanation:

Link:

Question (34)

A lens forms an image that is always smaller than the object regardless of distance. This identifies it as a:

Explanation:

Link:

Question (35)

In the chapter, eyeglasses help people see clearly because they contain:

Explanation:

Link:

Question (36)

Which observation from Activity 10.8 directly suggests that a water drop behaves like a lens?

Explanation:

Link:

Question (37)

A student places identical objects behind a convex lens and a concave lens at close distances. The convex lens image compared to the concave lens image will generally be:

Explanation:

Link:

Question (38)

Which statement about lenses and light beams is correct?

Explanation:

Link:

Question (39)

Solar concentrators use mirrors and lenses mainly to:

Explanation:

Link:

Question (40)

Assertion: A convex lens is called a converging lens. Reason: Parallel beams of light come closer together after passing through it.

Explanation:

Link:

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