Science - Light
Exam Duration: 45 Mins Total Questions : 30
'x' is a surface that cannot produce clear images. What is 'X'?
- (a)
Rough surface
- (b)
Ideal surface
- (c)
Smooth surface
- (d)
Smooth but curved surface
What is the phenomenon of light bouncing back into the same medium called?
- (a)
Reflection
- (b)
Refraction
- (c)
Dispersion
- (d)
Splitting
What is the perpendicular drawn at any point on a mirror called?
- (a)
Incident ray
- (b)
Reflected ray
- (c)
Normal
- (d)
Image
How many images are obtained when plane mirrors are arranged parallel to each other.
- (a)
A single image
- (b)
Two images
- (c)
Infinite number of images
- (d)
Zero image
If the angle of incidence is 80°, what will be the angle of reflection?
- (a)
80°
- (b)
100°
- (c)
160°
- (d)
20°
Which of the following is used by E.N.T. doctors?
- (a)
Convex mirror
- (b)
Convex lens
- (c)
Plane mirror
- (d)
Concave mirror
When the angle between two plane mirrors is 60°, how many images will be formed by the mirrors?
- (a)
5
- (b)
6
- (c)
7
- (d)
8
Which of the following statements is true?
- (a)
The angle of incidence is twice the angle of reflection.
- (b)
The incident ray, the reflected ray and the normal drawn at the point of incidence lie in the same plane.
- (c)
Some virtual images can be caught on the screen
- (d)
Some virtual images can be caught on the screen
What happens in lateral inversion?
- (a)
The right side of the object will be on the right side of the image
- (b)
The left side of the object will be on the left side of the image
- (c)
The top of the object will be the bottom of the object
- (d)
The right side of the object will be on the left side of the image.
In a periscope, how are the reflecting mirrors arranged?
- (a)
Perpendicular to each other
- (b)
Parallel to each other
- (c)
At an angle of 90°
- (d)
At an angle of 60o
What is the nature of image formed on the retina of human eye of an object?
- (a)
Virtual and erect
- (b)
Virtual and inverted
- (c)
Real and erect
- (d)
Real and inverted
Identify the value of persistence of vision.
- (a)
1/10th of a second
- (b)
1/12th of a second
- (c)
1/16th of a second
- (d)
1/20th of a second
The characteristics of an eye disease are given below.
(i) Eye sight becomes foggy
(ii) Eye lens becomes cloudy
(iii) There is a loss of vision
In which of the following are the above characteristics observed?
- (a)
Myopia
- (b)
Presbyopia
- (c)
Hypermetropia
- (d)
Cataract
Which of the following is the requirement of nocturnal animals like owl and bat?
- (a)
Large cornea
- (b)
Large pupil
- (c)
Retina with large number of rods
- (d)
large number of rods
Look at the given figure.
Find the angle between the incident ray and the reflected ray.
- (a)
60°
- (b)
90°
- (c)
80°
- (d)
40°
The diagram shows the path of a light ray X, directed at a plane mirror.
Which of the following is the correct reflected ray?
- (a)
M
- (b)
N
- (c)
O
- (d)
P
For a given incident ray, the plane of the mirror makes an angle e with the incident ray, then the reflected ray is turned through 2 e .Which of the following is based on the above principle?
- (a)
Periscope
- (b)
Kaleidoscope
- (c)
Shaving mirrors
- (d)
Automobile headlights
An object placed 4 m from a plane mirror is shifted by 0.5 m away from the mirror. What is the distance between the object and its image
- (a)
4m
- (b)
3.5 m
- (c)
9 m
- (d)
5 m
There are 11 letters in the word EXAMINATION. How many letters of this word are not changed when the word is seen in a plane mirror
- (a)
11
- (b)
5
- (c)
8
- (d)
9
Observe the figure given below
Find the angle between the incident ray and the reflected ray.
- (a)
65°
- (b)
90°
- (c)
130o
- (d)
25°
How is a rainbow formed?
- (a)
When raindrops absorb sunlight
- (b)
When raindrops reflect sunlight
- (c)
When raindrops disperse sunlight
- (d)
When raindrops diffract sunlight
Which of the following letters will be seen without any change in a plane mirror?
- (a)
S
- (b)
T
- (c)
L
- (d)
P
Which of the following is the characteristic of an ideal mirror?
- (a)
It absorbs all the amount of light incident on it.
- (b)
It refracts all the light
- (c)
It reflects all the light
- (d)
All of the above
In which of the following are plane mirrors arranged at an angle to get a number of coloured images?
- (a)
Periscope
- (b)
Kaleidoscope
- (c)
Telescope
- (d)
Thermoscope
Which of the following prevents internal reflections of light inside the human eye?
- (a)
Iris
- (b)
Pupil
- (c)
Choroid
- (d)
Blind spot
For a normal eye, in an adult, what is the least distance of distinct vision?
- (a)
5 to 8 cm
- (b)
10 to 15 cm
- (c)
20 to 25 cm
- (d)
30 to 35 cm
Identify the part of the human eye on which different images are formed?
- (a)
Iris
- (b)
Pupil
- (c)
Cornea
- (d)
Retina
Identify the nature of the image formed by the eye lens of a human eye
- (a)
Real, upright and enlarged
- (b)
Real, upright and diminished
- (c)
Real, inverted and diminished
- (d)
Virtual, inverted and diminished
Which of the following occurs in persons suffering from myopia?
- (a)
The eye ball is shortened
- (b)
Ciliary muscles contract
- (c)
The eye ball elongates
- (d)
The retina expands
According to the laws of reflection, which of the following statements is correct?
- (a)
The angle of incidence is greater than the angle of reflection
- (b)
The angle of incidence is less than the angle of reflection
- (c)
The angle of incidence is equal to the angle of reflection
- (d)
The angle of incidence is not equal to the angle of reflection