25/11/2024
1>
Which of the following is the correct statement about the laws of reflection?
a) Angle of incidence is greater than the angle of reflection
b) Angle of incidence is equal to the angle of reflection
c) Angle of incidence is less than the angle of reflection
d) Angle of incidence is always zero
Answer: b) Angle of incidence is equal to the angle of reflection
2>
When light passes from air to water, it:
a) Speeds up
b) Slows down
c) Travels in a straight line
d) Does not change its speed
Answer: b) Slows down
3>
The focal length of a concave mirror is:
a) Positive
b) Negative
c) Zero
d) Infinite
Answer: a) Positive
4>
A convex lens converges light rays at:
a) The focal point
b) The optical centre
c) The principal axis
d) The mirror's surface
Answer: a) The focal point
5>
In a concave mirror, if the object is placed at the focus, the image formed is:
a) Real, inverted, and of infinite size
b) Virtual, erect, and of finite size
c) Real, inverted, and of finite size
d) Virtual, erect, and of infinite size
Answer: a) Real, inverted, and of infinite size
6>
Which of the following is true about the image formed by a convex mirror?
a) It is real, inverted, and diminished
b) It is real, erect, and magnified
c) It is virtual, erect, and diminished
d) It is virtual, inverted, and diminished
Answer: c) It is virtual, erect, and diminished
7>
When a light ray passes from air into water, the ray bends:
a) Towards the normal
b) Away from the normal
c) It does not bend
d) It bends in the same direction as the incident ray
Answer: a) Towards the normal
8>
The critical angle for total internal reflection is the angle of incidence for which the angle of refraction is: a) 0°
b) 45°
c) 90°
d) 180°
Answer: c) 90°
9>
Which of the following is responsible for the dispersion of light through a prism?
a) Reflection
b) Refraction
c) Diffraction
d) Absorption
Answer: b) Refraction
10>
The band of colours produced when white light is passed through a prism is called:
a) Rainbow
b) Spectrum
c) Halo
d) Reflection
Answer: b) Spectrum
11>
The colour of an object depends on:
a) The colour of the light falling on the object
b) The size of the object
c) The shape of the object
d) The density of the object
Answer: a) The color of the light falling on the object
12>
Which of the following is the correct order of colours in the visible spectrum?
a) Red, Orange, Yellow, Green, Blue, Violet
b) Violet, Blue, Green, Yellow, Orange, Red
c) Red, Green, Yellow, Blue, Violet, Orange
d) Blue, Red, Green, Yellow, Orange, Violet
Answer: b) Violet, Blue, Green, Yellow, Orange, Red
13>
Which of the following devices works on the principle of total internal reflection?
a) Telescope
b) Camera
c) Optical fiber
d) Microscope
Answer: c) Optical fiber
14>
The phenomenon of colour dispersion is responsible for the formation of:
a) A rainbow
b) A mirage
c) A shadow
d) A reflection
Answer: a) A rainbow
