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Question (1)

QN002471

A lens is best described as a piece of transparent material that:

(A) Has only flat surfaces
(B) Has curved surfaces and allows light to pass through
(C) Reflects all light falling on it
(D) Produces sound waves

Correct Answer: B

Explanation:

A lens is a transparent object with at least one curved surface that refracts light.

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Question (2)

QN002472

In Activity 10.8, the water drop acted like a simple lens because its surface was:

(A) Flat
(B) Curved outward
(C) Rough
(D) Opaque

Correct Answer: B

Explanation:

The curved shape of the water drop helps it behave like a lens.

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Question (3)

QN002473

When viewed through the water drop in Activity 10.8, the letters appeared:

(A) Smaller
(B) Blurred only
(C) Larger
(D) Invisible

Correct Answer: C

Explanation:

The water drop magnifies the letters.

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Question (4)

QN002474

Which instrument uses a lens to make small letters appear bigger?

(A) Compass
(B) Magnifying glass
(C) Thermometer
(D) Barometer

Correct Answer: B

Explanation:

A magnifying glass uses a convex lens.

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Question (5)

QN002475

A convex lens is thicker at the:

(A) Edges than the middle
(B) Middle than the edges
(C) Top than the bottom
(D) Bottom than the top

Correct Answer: B

Explanation:

A convex lens bulges outward and is thicker at the centre.

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Question (6)

QN002476

A concave lens is thicker at the:

(A) Middle than the edges
(B) Centre only
(C) Edges than the middle
(D) Upper half only

Correct Answer: C

Explanation:

A concave lens is thinner at the centre and thicker at the edges.

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Question (7)

QN002477

Unlike mirrors, lenses:

(A) Reflect all light
(B) Allow light to pass through them
(C) Are always opaque
(D) Form only enlarged images

Correct Answer: B

Explanation:

Lenses transmit and refract light.

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Question (8)

QN002478

An object is placed very close behind a convex lens. The image appears:

(A) Inverted and diminished
(B) Erect and enlarged
(C) Erect and diminished
(D) Invisible

Correct Answer: B

Explanation:

A nearby object forms an erect enlarged image through a convex lens.

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Question (9)

QN002479

As an object is moved farther away from a convex lens, the image eventually becomes:

(A) Erect and enlarged
(B) Erect and same size
(C) Inverted
(D) Invisible

Correct Answer: C

Explanation:

A convex lens forms inverted images for distant objects.

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Question (10)

QN002480

A concave lens always forms an image that is:

(A) Inverted and enlarged
(B) Erect and enlarged
(C) Erect and diminished
(D) Same size as the object

Correct Answer: C

Explanation:

A concave lens always forms an erect diminished image.

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Question (1)

A lens is best described as a piece of transparent material that:

Explanation:

Link:

Question (2)

In Activity 10.8, the water drop acted like a simple lens because its surface was:

Explanation:

Link:

Question (3)

When viewed through the water drop in Activity 10.8, the letters appeared:

Explanation:

Link:

Question (4)

Which instrument uses a lens to make small letters appear bigger?

Explanation:

Link:

Question (5)

A convex lens is thicker at the:

Explanation:

Link:

Question (6)

A concave lens is thicker at the:

Explanation:

Link:

Question (7)

Unlike mirrors, lenses:

Explanation:

Link:

Question (8)

An object is placed very close behind a convex lens. The image appears:

Explanation:

Link:

Question (9)

As an object is moved farther away from a convex lens, the image eventually becomes:

Explanation:

Link:

Question (10)

A concave lens always forms an image that is:

Explanation:

Link:

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