Chapter 4: Dispersion of Light - Science Mcqs for Grade 7 - Set 2

1)   If the angle of incidence at the far-edge is too large, the light would

a. escape
b. not escape
c. end in the object
d. spread into seven colors
Answer  Explanation 

ANSWER: not escape

Explanation:
No explanation is available for this question!


2)   We cannot see through

a. transparent objects
b. opaque objects
c. luminous objects
d. non luminous objects
Answer  Explanation 

ANSWER: opaque objects

Explanation:
No explanation is available for this question!


3)   The convex lens

a. shrinks the image
b. magnifies the image
c. sharpens the image
d. increases the contrast of the image
Answer  Explanation 

ANSWER: magnifies the image

Explanation:
No explanation is available for this question!


4)   Non luminous objects are colored by the process of

a. color addition
b. color subtraction
c. color multiplication
d. color division
Answer  Explanation 

ANSWER: color subtraction

Explanation:
No explanation is available for this question!


5)   The dispersion can be noticed by passing a white light through

a. glass
b. mirror
c. water
d. prism
Answer  Explanation 

ANSWER: prism

Explanation:
No explanation is available for this question!


6)   To enable you to see a rainbow the sun should be positioned

a. in front of you
b. behind you
c. on your left side
d. on your right side
Answer  Explanation 

ANSWER: behind you

Explanation:
No explanation is available for this question!


7)   Night blindness is caused due to

a. lack of rods
b. over numbering of cones
c. problem in cones
d. problem in rods
Answer  Explanation 

ANSWER: problem in rods

Explanation:
No explanation is available for this question!


8)   The angle which is formed between normal ray and the ray entering a medium is known as

a. critical angle
b. angle of incidence
c. angle of reflection
d. angle of refraction
Answer  Explanation 

ANSWER: angle of incidence

Explanation:
No explanation is available for this question!


9)   Focal point is the point where

a. light spread out quickly
b. light rays meet
c. lens can magnify the most
d. dispersion of light occurs
Answer  Explanation 

ANSWER: light rays meet

Explanation:
No explanation is available for this question!


10)   Waves on top of spectrum are

a. infrared waves
b. gamma rays
c. x-rays
d. ultraviolet rays
Answer  Explanation 

ANSWER: infrared waves

Explanation:
No explanation is available for this question!


11)   The angle between the normal ray and the ray leaving a medium is known as

a. critical angle
b. angle of incidence
c. angle of reflection
d. angle of refraction
Answer  Explanation 

ANSWER: angle of refraction

Explanation:
No explanation is available for this question!


12)   Filters do not

a. change the light
b. change the color
c. change the primary colors
d. change the secondary colors
Answer  Explanation 

ANSWER: change the color

Explanation:
No explanation is available for this question!


13)   Rods are sensitive to

a. bright light
b. dim light
c. colored Vision
d. blurriness
Answer  Explanation 

ANSWER: dim light

Explanation:
No explanation is available for this question!


14)   If light enters a dense object in angle of zero, it would

a. bend
b. reflect back
c. go straight
d. turn towards right
Answer  Explanation 

ANSWER: go straight

Explanation:
No explanation is available for this question!


15)   Leaf looks green because it absorbs

a. all colors except green
b. green color and reflects others
c. red and yellow color
d. blue and yellow color
Answer  Explanation 

ANSWER: all colors except green

Explanation:
No explanation is available for this question!


16)   If light enters a glass, it slows down more than

a. 200,000 km/s
b. 150,000 km/s
c. 100,000 km/s
d. 50,000 km/s
Answer  Explanation 

ANSWER: 150,000 km/s

Explanation:
No explanation is available for this question!


17)   When light enters a dense medium, it leaves the object from

a. the same point
b. a different point
c. the far end
d. the close end
Answer  Explanation 

ANSWER: the far end

Explanation:
No explanation is available for this question!


18)   Light bends in all materials at

a. same angle
b. different angles
c. nearly same angles
d. opposite angles
Answer  Explanation 

ANSWER: different angles

Explanation:
No explanation is available for this question!


19)   Refractive index of diamond is

a. 2
b. 2.5
c. 2.42
d. 2.65
Answer  Explanation 

ANSWER: 2.42

Explanation:
No explanation is available for this question!


20)   The color of one part of spectrum is

a. brown
b. cyan
c. indigo
d. magenta
Answer  Explanation 

ANSWER: indigo

Explanation:
No explanation is available for this question!