CBSE Class 8 Science – MCQ and Online Tests – Unit 16 – Light
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CBSE Class 8 Science – MCQ and Online Tests – Unit 16 – Light
Choose the correct option in the following questions:
Question 1.
When we stand in front of our dressing table, our left hand seems to be right and right seems to be left. This is called
(a) Left-right confusion
(b) Lateral inversion
(c) Up -side down phenomenon
(d) mirage
Answer
Answer: (b) Lateral inversion
Question 2.
The amount of light entering the eye is controlled by
(a) eye lens
(b) cornea
(c) iris
(d) ciliary muscle
Answer
Answer: (c) iris
Question 3.
Light passing through a prism splits into seven colours. This is called
(a) Dispersion
(b) Dissolution
(c) Division
(d) None of the above
Answer
Answer: (a) Dispersion
Question 4.
In case of reflection of light, the angle of incidence (i) and the angle of reflection (r) are related as
(a) i = r
(b) i < r
(c) i > r
(d) no definite relation
Answer
Answer: (a) i = r
Question 5.
Name the type of mirror used as a backview mirror.
(a) Plane mirror
(b) Concave mirror
(c) Convex mirror
(d) Any of these
Answer
Answer: (c) Convex mirror
Question 6.
Visually impaired people can read and write using
(a) electronic writer
(b) digital pens
(c) braille system
(d) hearing aids
Answer
Answer: (c) braille system
Question 7.
The image formed by a camera and a simple microscope are respectively
(a) real and real
(b) real and virtual
(c) virtual and virtual
(d) virtual and real
Answer
Answer: (b) real and virtual
Question 8.
What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray?
(a) 60°
(b) 45°
(c) 90°
(d) 180°
Answer
Answer: (b) 45°
Question 9.
The splitting of white light into its seven constituent colours is called
(a) refraction
(b) dispersion
(c) deviation
(d) reflection
Answer
Answer: (b) dispersion
Question 10.
The defect due to which a person is not able to see the distant objects clearly:
(a) Myopia
(b) Hypermetropia
(c) Cornea
(d) Cataract
Answer
Answer: (a) Myopia
Question 11.
A smooth shining surface, which rebounds the light back in same or in different direction, is called
(a) a mirror
(b) a lens
(c) reflection of light
(d) point of incidence
Answer
Answer: (a) a mirror
Question 12.
Beam of light striking the reflecting surface is called
(a) reflecting ray
(b) incident ray
(c) refracted ray
(d) normal ray
Answer
Answer: (b) incident ray
Question 13.
Myopia can be corrected by using a
(a) concave lens
(b) convex lens
(c) opaque lens
(d) micro lens
Answer
Answer: (a) concave lens
Question 14.
Light enters the eye through
(a) eye lens
(b) pupil
(c) cornea
(d) retina
Answer
Answer: (c) cornea
Question 15.
If the angle of incidence of light falling on a plane mirror is 30°, what will be the angle of reflection?
(a) 90°
(b) 60°
(c) 30°
(d) 0°
Answer
Answer: (c) 30 degree
Question 16.
In our eye _______ cells can sense colour
(a) Rod
(b) Cone
(c) Both rod and cone
(d) Neither rod nor cone
Answer
Answer: (b) Cone
Question 17.
An owl can see clearly at night but not day time because it has
(a) More rods and few cones
(b) Less rod and more cones
(c) More rods and more cone
(d) Less rods and less cones
Answer
Answer: (a) More rods and few cones
Question 18.
Rainbow is a natural phenomenon showing
(a) Reflection
(b) Deflection
(c) Dispersion
(d) Diversion
Answer
Answer: (a) Reflection
Question 19.
In the retina of the eye, the area having no sensory cells is called
(a) iris
(b) Blind spot
(c) cornea
(d) Dark spot
Answer
Answer: (b) Blind spot
Question 20.
If light falls perpendicularly on a plane mirror, what will be the angle in which it will be reflected?
(a) 45°
(b) 90°
(c) 180°
(d) 360°
Answer
Answer: (c) 180 degrees
Question 21.
Which of the following is not a luminous object?
(a) sun
(b) candle
(c) moon
(d) Tube light
Answer
Answer: (c) moon
Question 22.
To make a kaleidoscope we require
(a) Three plane mirrors
(b) Four plane mirrors
(c) Three glass sheets
(d) Four glass sheets
Answer
Answer: (a) Three plane mirrors
Question 23.
Band of seven colours is called
(a) VIBGYOR
(b) spectrum
(c) dispersion
(d) reflection
Answer
Answer: (b) spectrum
Question 24.
Front balged part of the eyeball is called
(a) cornea
(b) choroid
(c) pupil
(d) retina
Answer
Answer: (a) cornea
Question 25.
Which one of the following statements is correct regarding rods and cones in the human eye?
(a) Cones are sensitive to dim light
(b) Cones are sensitive to bright light
(c) Rods are sensitive to bright light
(d) Rods can sense colour
Answer
Answer: (b) Cones are sensitive to bright light
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