Homework Practice

Printable assignment

Final Assessment: Light

Section A: Key Concepts

Question 1mcq

Which lens is thicker at the centre than at the edges?

A.Convex lens

B.Concave lens

C.Plane mirror

D.Opaque sheet

Question 2mcq

A lens spreads parallel light rays apart after they pass through it. Which lens is it?

A.Convex lens

B.Concave lens

C.Plane mirror

D.Polished spoon only

Question 3mcq

Which lens is commonly used as a magnifying glass?

A.Concave lens

B.Flat mirror

C.Convex lens

D.Rough glass

Question 4mcq

A student labels a concave lens as “converging” in a diagram. What is the mistake?

A.A concave lens is not transparent.

B.A lens cannot bend light.

C.A concave lens is the same as a plane mirror.

D.A concave lens is diverging, not converging.

Question 5mcq

Which comparison is correct?

A.Convex lens converges light; concave lens diverges light.

B.Convex lens diverges light; concave lens converges light.

C.Both lenses only reflect light.

D.Both lenses always form shadows only.

Question 6mcq

When white light passes through a prism and splits into colours, this is called:

A.Evaporation

B.Dispersion

C.Neutralisation

D.Rusting

Section B: Applications

Question 7mcq

Which natural event is mainly due to dispersion of sunlight by water droplets?

A.Earthquake

B.Lightning conductor

C.Rainbow

D.Sound echo

Question 8mcq

Which sequence is the correct order of colours often remembered by VIBGYOR?

A.Red, green, blue, yellow, violet, orange, indigo

B.Yellow, orange, red, violet, green, blue, indigo

C.Blue, black, brown, green, red, white, violet

D.Violet, indigo, blue, green, yellow, orange, red

Question 9mcq

A student says, “White light has no colours inside it.” Which observation disproves this?

A.A prism splits white light into a band of colours.

B.A mirror forms a virtual image.

C.A bulb becomes hot after use.

D.A shadow forms behind an opaque object.

Question 10mcq

Why does a glass prism produce a spectrum instead of a single white patch?

A.All colours travel backward only.

B.Different colours bend by different amounts.

C.The prism absorbs every colour except black.

D.The screen changes white light into paint.

Question 11mcq

Which optical device is best for seeing traffic behind a car?

A.Concave lens

B.Opaque screen

C.Convex mirror

D.Plain paper

Question 12mcq

Which device is suitable for focusing sunlight onto a small spot?

A.Concave lens

B.Convex mirror only

C.Black cardboard only

D.Convex lens

Section C: Observations and Data

Question 13mcq

Which mirror would be most useful in a solar cooker to concentrate sunlight?

A.Concave mirror

B.Convex mirror

C.Plane mirror only

D.Rough steel plate

Question 14mcq

A student wants a device to spread a beam of light. Which should be chosen?

A.Convex lens

B.Concave lens

C.Concave mirror focused close

D.Plane mirror at rest

Question 15mcq

Which pairing is correct?

A.Rear-view mirror — concave lens

B.Rainbow — plane mirror only

C.Magnifying glass — convex lens

D.Dental mirror — convex lens always

Question 16mcq

A candle, card with a small hole, and screen form an inverted image. Which idea explains the image?

A.Magnetic effect of current

B.Water table recharge

C.Heating effect of current

D.Straight-line travel of light through the pinhole

Question 17mcq

A shop mirror shows more of the room but people look smaller. What should a student infer?

A.The mirror is convex.

B.The mirror is concave and magnifying everyone.

C.The mirror is a prism.

D.The mirror is a concave lens.

Question 18mcq

In a ray diagram, reflected rays seem to come from behind a plane mirror. What type of image is formed?

A.Real image

B.Virtual image

C.Chemical image

D.No image at all

Section D: Reasoning Challenge

Question 19mcq

Which option best fixes a wrong statement: “A concave lens focuses sunlight to a point”?

A.A concave lens focuses sound, not light.

B.No lens can bend sunlight.

C.A convex lens focuses sunlight; a concave lens spreads rays.

D.A plane mirror always focuses sunlight to one point.

Question 20mcq

A student must choose between a plane mirror, prism, convex lens and concave lens to show colours in white light. Which should be used?

A.Plane mirror

B.Convex lens only

C.Concave lens only

D.Prism

Question 21mcq

A student uses a prism, a plane mirror and a convex mirror. Which task belongs to the prism?

A.Splitting white light into colours

B.Showing a wider rear view

C.Forming an equal-size virtual image

D.Holding soil on a slope

Question 22mcq

A mirror in a torch reflector sends light forward as a strong beam. Which mirror shape is commonly used?

A.Convex mirror

B.Concave mirror

C.Plane mirror only

D.Concave lens

Question 23mcq

If a clock shows 3:00 in a plane mirror, why can it look confusing?

A.The mirror changes time physically.

B.The mirror stops reflection after 3:00.

C.The mirror causes lateral inversion of the clock face.

D.The image is always real on a screen.

Question 24mcq

Which lens would make parallel rays meet on a paper screen?

A.Concave lens

B.Plane mirror

C.Opaque card

D.Convex lens