Integrated Science

Question 1

1The refractive index of a medium in which light travels at 2.25 × 10⁸ m/s is (c = 3 × 10⁸ m/s)

Hard

A. 1.5 B. 1.33 C. 2.25 D. 0.75

Question 2

2Objects that let no light pass through them are

Easy

A. transparent B. opaque C. translucent D. luminous

Question 3

3The power of a converging lens of focal length 25 cm is

Hard

A. +25 D B. −4 D C. +0.25 D D. +4 D

Question 4

4Short-sightedness is corrected using a

Hard

A. convex lens B. prism C. concave lens D. plane mirror

Question 5

5A periscope uses

Easy

A. one prism only B. two plane mirrors C. two lenses only D. a convex mirror

Question 6

6White light splits into colours when passed through a prism. This is

Easy

A. dispersion B. absorption C. diffraction D. reflection

Question 7

7An object 10 cm from a converging lens of focal length 15 cm forms an image that is

Hard

A. virtual, upright and magnified B. at infinity C. real and inverted D. real and diminished

Question 8

8A converging lens is used to correct

Easy

A. astigmatism only B. short sight C. long sight D. colour blindness

Question 9

9A rainbow forms when sunlight is

Easy

A. reflected by the ground B. blocked by the moon C. dispersed by raindrops D. absorbed by clouds

Question 10

10A pencil standing in a glass of water looks bent at the surface. This is caused by

Easy

A. reflection B. refraction C. diffraction D. dispersion