Grade 10 : Science - 9. Light (Set 4)

Question 1

A ray of light strikes a plane mirror at an angle of 30° with the surface. What is the angle of reflection?

Accepted Answer

B) 60°

Answer

A) 30°

Answer

C) 90°

Answer

D) 45°

Question 2

The focal length of a concave mirror is 20cm. Where should an object be placed to obtain a real, inverted image of the same size?

Accepted Answer

A) 40cm

Answer

B) 20cm

Answer

C) 10cm

Answer

D) 60cm

Question 3

Light travels from air into glass with a refractive index of 1.5. If the speed of light in air is $3 imes 10^8m/s$, what is the speed in glass?

Accepted Answer

C) 2 × 10^8m/s

Answer

A) 4.5 × 10^8m/s

Answer

B) 1.5 × 10^8m/s

Answer

D) 3 × 10^8m/s

Question 4

Which lens is used to correct myopia (nearsightedness)?

Accepted Answer

B) Concave lens

Answer

A) Convex lens

Answer

C) Bifocal lens

Answer

D) Cylindrical lens

Question 5

If the magnification produced by a mirror is -2, what type of mirror is it?

Accepted Answer

A) Concave

Answer

B) Convex

Answer

C) Plane

Answer

D) None of these

Question 6

An object is at a distance of 15cm from a convex lens of focal length 10cm. Where is the image formed?

Accepted Answer

B) 30cm

Answer

A) 15cm

Answer

C) 10cm

Answer

D) -30cm

Question 7

The power of a lens is -2.0 D. What is its focal length?

Accepted Answer

C) -50cm

Answer

A) 20cm

Answer

B) -20cm

Answer

D) 50cm

Question 8

Which color of light bends the most when passing through a glass prism?

Accepted Answer

A) Violet

Answer

B) Red

Answer

C) Yellow

Answer

D) Green

Question 9

When an object is at infinity for a convex mirror, where is the image formed?

Accepted Answer

B) At the focus

Answer

A) At infinity

Answer

C) At the center of curvature

Answer

D) Behind the mirror at double the focal length

Question 10

What is the formula for the refractive index of medium 2 with respect to medium 1?

Accepted Answer

A) n_{21} = v_1 / v_2

Answer

B) n_{21} = v_2 / v_1

Answer

C) n_{21} = v_1 × v_2

Answer

D) n_{21} = 1 / (v_1 + v_2)

Question 11

A virtual image is always...

Accepted Answer

C) Erect

Answer

A) Inverted

Answer

B) Diminished

Answer

D) Magnified

Question 12

What happens to the focal length of a convex lens if it is immersed in water?

Accepted Answer

A) It increases

Answer

B) It decreases

Answer

C) It remains unchanged

Answer

D) It becomes zero

Question 13

Which of the following is NOT a property of a plane mirror image?

Accepted Answer

B) Real

Answer

A) Same size as object

Answer

C) Virtual

Answer

D) Laterally inverted

Question 14

The magnification of a concave lens is always...

Accepted Answer

C) Less than 1

Answer

A) Greater than 1

Answer

B) Equal to 1

Answer

D) Negative

Question 15

Light rays parallel to the principal axis of a convex mirror, after reflection, appear to diverge from...

Accepted Answer

B) The focus

Answer

A) The optical center

Answer

C) The pole

Answer

D) The center of curvature

Question 16

If the angle of incidence is 0°, what is the angle of refraction?

Accepted Answer

D) 0°

Answer

A) 90°

Answer

B) 45°

Answer

C) 30°

Question 17

Which lens is used to correct hypermetropia (farsightedness)?

Accepted Answer

A) Convex lens

Answer

B) Concave lens

Answer

C) Cylindrical lens

Answer

D) Plane glass

Question 18

The mirror formula is given by:

Accepted Answer

C) 1/f = 1/v + 1/u (with sign conventions)

Answer

A) 1/f = 1/v + 1/u

Answer

B) 1/f = 1/v - 1/u

Answer

D) f = v + u

Question 19

Which of the following is responsible for the twinkling of stars?

Accepted Answer

B) Atmospheric refraction

Answer

A) Reflection

Answer

C) Total internal reflection

Answer

D) Dispersion

Question 20

A concave mirror with $f = 15cm$forms a real image at30 cmfrom the mirror. Where is the object placed?

Accepted Answer

A) 30cm

Answer

B) 15cm

Answer

C) 60cm

Answer

D) 20cm

Set 4Grade 10 : Science - Light

Grade 10 : Science - Light

Examination Instructions:

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Set 4Grade 10 : Science - Light

Grade 10 : Science - Light

Examination Instructions:

Discussion 0

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Set 4Grade 10 : Science - Light

Grade 10 : Science - Light

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Set 4Grade 10 : Science - Light

Grade 10 : Science - Light

Examination Instructions:

Share This Quiz

Discussion 0

Rating & Discussion Locked

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