Light Energy - ICSE STD 7 PHYSICS Questions - Vidyadip

Question types

Light Energy question types

71 questions across 7 question groups — pick any mix to generate a PHYSICS paper with step-by-step answer keys.

71

Questions

7

Question groups

5

Question types

MCQ

[1 Mark Question Answer]

[2 Mark Question Answer]

[3 Mark Question Answer]

[5 Mark Question Answer]

fill in the blanks.

TRUE / FALSE

Sample Questions

Light Energy questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1MCQ1 Mark

The primary colours are

A
Red, Blue and Yellow
B
Magenta, Yellow and Cyan
C
Red, Blue and Cyan
✓
Blue, Green and Red

Answer: D.

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Q 2MCQ1 Mark

A red rose is seen in green light. It will appear.

A
red
B
blue
C
yellow
✓
black

Answer: D.

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Q 3MCQ1 Mark

The speed of light is maximum in

A
glass
B
water
✓
air
D
wood

Answer: C.

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Q 4MCQ1 Mark

The property due to which a light ray striking a surface is returned back into the same medium is called

A
refraction
B
reflex action
✓
reflection
D
regression

Answer: C.

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Q 5MCQ1 Mark

The angle of incidence on a plane mirror is $30^\circ $. The angle between the incident ray and the reflected ray is

A
$30^{\circ}$
B
$15^{\circ}$
✓
$60^{\circ}$
D
$90^{\circ}$

Answer: C.

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Q 6[1 Mark Question Answer]1 Mark

A ray of light falls normally on a plane mirror. What is the angle of incidence ?

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Q 7[1 Mark Question Answer]1 Mark

A piece of paper appears black in sunlight. What will be it£ colour when seen in red light ?

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Q 8[1 Mark Question Answer]1 Mark

Why does a piece of paper appear white in sunlight ? How would you expect it to appear when viewed in red light?

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Q 9[1 Mark Question Answer]1 Mark

A rose appears red in white light. How will it appear in red light?
Give a reason for your answer.

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Q 10[1 Mark Question Answer]1 Mark

A rose appears red in white light. How will it appear in
green light? Give a reason for your answer.

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Q 11[2 Mark Question Answer]2 Marks

State the two laws of reflection of light.

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Q 12[2 Mark Question Answer]2 Marks

What are the secondary colours ? Name the three secondary colours.

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Q 13[2 Mark Question Answer]2 Marks

What are the primary colours ? Name the three primary colours.

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Q 14[2 Mark Question Answer]2 Marks

State two uses of a plane mirror.

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Q 15[2 Mark Question Answer]2 Marks

How is a plane mirror made ?

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Q 16[3 Mark Question Answer]3 Marks

Draw a diagram to show the reflection of a light ray incident normally on a plane mirror.

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Q 17[3 Mark Question Answer]3 Marks

Draw a diagram showing the reflection of a light ray from a plane mirror. Label on it the incident ray, the reflected ray, the normal, the angle of incidence i and the angle of reflection r.

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Q 18[3 Mark Question Answer]3 Marks

What is irregular reflection ? Give an example.

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Q 19[3 Mark Question Answer]3 Marks

What is meant by lateral inversion of an image in a plane mirror ? Explain it with the help of a diagram.

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Q 20[3 Mark Question Answer]3 Marks

State four characteristics of the image formed by a plane mirror.

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Q 21[5 Mark Question Answer]5 Marks

The diagram in Fig. shows an incident ray AO and the reflected ray OB from a plane mirror. The angle AOB is 30°. Draw normal on the plane mirror at the point O and find :

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Q 22[5 Mark Question Answer]5 Marks

Describe an experiment to verify the laws of reflection of light. Ans. Laws of reflection.

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Q 23[5 Mark Question Answer]5 Marks

Explain the following terms:
Incident ray, Reflected ray, Angle of incidence, Angle of reflection, Normal.

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Q 24[5 Mark Question Answer]5 Marks

Match the following

(a). A light ray passes from air to glass	(1) . speeds up
(b). A light ray passes from glass to water	(2). reflects red light
(c). Virtual image	(3). primary colours
(d). Red rose	(4). plane mirror
(e). Red, green, and blue	(5). slows down

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Q 25fill in the blanks.1 Mark

Green + Red = ______

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Q 26fill in the blanks.1 Mark

Red + Blue = _______

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Q 27fill in the blanks.1 Mark

Red + Blue + _______ = White

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Q 28fill in the blanks.1 Mark

Blue + _______ = Cyan

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Q 29fill in the blanks.1 Mark

Magenta, cyan and yellow are the ________ colours.

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Q 30TRUE / FALSE1 Mark

The primary colours are red, blue and green.

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Q 31TRUE / FALSE1 Mark

A black paper absorbs light of all the colours and reflects none.

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Q 32TRUE / FALSE1 Mark

A rose appears red in light of all the colours.

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Q 33TRUE / FALSE1 Mark

The speed of light in vacuum is $3 \times 10^8 ms^{-}$.

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Q 34TRUE / FALSE1 Mark

The objects are seen around us due to irregular reflection of light.

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