Default Title

Question (21)

QN002491

In Activity 10.11, sunlight was concentrated on paper using a:

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

Correct Answer: B

Explanation:

A convex lens can focus sunlight to a small spot.

Link:

Report Error

Question (22)

QN002492

The paper begins to burn in Activity 10.11 because the convex lens:

(A) Reflects sunlight
(B) Blocks sunlight
(C) Concentrates sunlight into a small area
(D) Produces electricity

Correct Answer: C

Explanation:

Concentrated light produces enough heat to burn paper.

Link:

Report Error

Question (23)

QN002493

A convex lens converges light because its shape is:

(A) Thicker at the centre
(B) Thicker at the edges
(C) Completely flat
(D) Irregular

Correct Answer: A

Explanation:

The thicker centre bends rays inward.

Link:

Report Error

Question (24)

QN002494

Which device mentioned in the chapter contains lenses?

(A) Smartphone camera
(B) Steel ruler
(C) Blackboard
(D) Compass box

Correct Answer: A

Explanation:

Cameras use lenses to form images.

Link:

Report Error

Question (25)

QN002495

The human eye contains a:

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

Correct Answer: C

Explanation:

The eye contains a flexible convex lens.

Link:

Report Error

Question (26)

QN002496

A unique feature of the lens inside the human eye is that it can:

(A) Reflect light completely
(B) Change its shape
(C) Become opaque at will
(D) Rotate continuously

Correct Answer: B

Explanation:

Eye lenses change shape for focusing.

Link:

Report Error

Question (27)

QN002497

If parallel light beams emerge spreading out after passing through a lens, the lens is:

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

Correct Answer: B

Explanation:

Divergence of rays indicates a concave lens.

Link:

Report Error

Question (28)

QN002498

If parallel light beams emerge closer together after passing through a lens, the lens is:

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

Correct Answer: C

Explanation:

Convergence of rays indicates a convex lens.

Link:

Report Error

Question (29)

QN002499

An object appears enlarged and upright through a lens. Which lens is most likely being used?

(A) Concave lens
(B) Convex lens with object close to it
(C) Plane glass
(D) Any lens

Correct Answer: B

Explanation:

A nearby object viewed through a convex lens appears enlarged.

Link:

Report Error

Question (30)

QN002500

Which statement correctly defines a convex lens?

(A) A lens thicker at the edges than at the centre
(B) A lens with one flat surface only
(C) A lens thicker at the middle than at the edges
(D) A lens that reflects light

Correct Answer: C

Explanation:

A convex lens is thicker at the centre than the edges.

Link:

Report Error

Question (21)

In Activity 10.11, sunlight was concentrated on paper using a:

Explanation:

Link:

Question (22)

The paper begins to burn in Activity 10.11 because the convex lens:

Explanation:

Link:

Question (23)

A convex lens converges light because its shape is:

Explanation:

Link:

Question (24)

Which device mentioned in the chapter contains lenses?

Explanation:

Link:

Question (25)

The human eye contains a:

Explanation:

Link:

Question (26)

A unique feature of the lens inside the human eye is that it can:

Explanation:

Link:

Question (27)

If parallel light beams emerge spreading out after passing through a lens, the lens is:

Explanation:

Link:

Question (28)

If parallel light beams emerge closer together after passing through a lens, the lens is:

Explanation:

Link:

Question (29)

An object appears enlarged and upright through a lens. Which lens is most likely being used?

Explanation:

Link:

Question (30)

Which statement correctly defines a convex lens?

Explanation:

Link:

Excel With Tutors

ExcelWithTutors

For Student

For Tutors

Learn

OUR POLICY