7th Grade > Physics
LIGHT MCQs
Total Questions : 117
| Page 3 of 12 pages
Question 21. Match the following: [5 MARKS]
Column I
Column II
(a) A plane mirror
(i) Used as a magnifying glass.
(b) A convex mirror
(ii) Can form the image of objects spread over a large area.
(c) A convex lens
(iii) Used by dentists to see an enlarged image of teeth.
(d) A concave mirror
(iv) The image is always inverted and magnified.
(e) A concave lens
(v) The image is erect and of the same size as the object.
(vi) The image is erect and smaller in size than the object.
Column I
Column II
(a) A plane mirror
(i) Used as a magnifying glass.
(b) A convex mirror
(ii) Can form the image of objects spread over a large area.
(c) A convex lens
(iii) Used by dentists to see an enlarged image of teeth.
(d) A concave mirror
(iv) The image is always inverted and magnified.
(e) A concave lens
(v) The image is erect and of the same size as the object.
(vi) The image is erect and smaller in size than the object.
:
Each correct match: 1 Mark
Column I
Column II
(a) A plane mirror
(v) The image is erect and of the same size as the object.
(b) A convex mirror
(ii) Can form the image of objects spread over a large area.
(c) A convex lens
(i) Used as a magnifying glass.
(d) A concave mirror
(iii) Used by dentists to see an enlarged image of teeth.
(e) A concave lens
(vi) The image is erect and smaller in size than the object.
:
Uses : 1 Mark each
(i)They are also put on corners of roads so that you can see any cars coming to avoid collisions.
(ii)Convex mirrors are also used in making lenses of sunglasses to help reflect the light of sun away from the eyes of the person wearing the sunglasses.
(iii)They are also used in telescopes.
:
Sub-parts: 1 Mark each
(i) A ray of light indicates a single ray of light.
(ii) A bundle of light rays collectively is called a Beam of light.
:
Answer : 1 Mark
Reason : 1 Mark
Convex mirror is used as reflectors at sharp turns or blind corners.
Convex mirrors are also known as converging mirror. Because of this the image formed by the mirror is a converged image of numerous objects. This gives the driver a larger field of vision thus, helping them take well-informed decisions.
:
(a) Definition: 1 Mark
(b)Explanation: 2 Marks
(a) The image that cannot be obtained on a screen is called a virtual image.
(b) Avirtual imageis animage formedwhen the outgoing rays from a point on an object always diverge. Theimageappears to be located at the point of apparent divergence. Because the rays never really converge, avirtual imagecannot be projected onto a screen.
Answer: Option A. -> reflection
:
A
The bouncing back of light from a shiny surfaceis called asreflection. Reflection always follows certain laws called the laws of reflection. The laws are as follows:
1. Angle of incidence is equal to the angle of reflection.
2. The incident ray, normal and the reflected ray lie in the same plane.
:
A
The bouncing back of light from a shiny surfaceis called asreflection. Reflection always follows certain laws called the laws of reflection. The laws are as follows:
1. Angle of incidence is equal to the angle of reflection.
2. The incident ray, normal and the reflected ray lie in the same plane.
Answer: Option A. -> True
:
A
If the reflecting surface is curved outwards it is a convex mirror. A convex mirror always forms a virtual, erect and diminished image. A convex mirror is a divergent mirror i.e it has wide field of view. Hence, the convex mirror is used as a side-view mirror in vehicles.
:
A
If the reflecting surface is curved outwards it is a convex mirror. A convex mirror always forms a virtual, erect and diminished image. A convex mirror is a divergent mirror i.e it has wide field of view. Hence, the convex mirror is used as a side-view mirror in vehicles.
Answer: Option A. -> plane
:
A
Image formed by a plane mirror is erect and always of the same size as the object. The image formed by a convex mirror is upright but reduced in size whereas in a concave mirror the size of image is not fixed.
:
A
Image formed by a plane mirror is erect and always of the same size as the object. The image formed by a convex mirror is upright but reduced in size whereas in a concave mirror the size of image is not fixed.
Answer: Option A. -> White
:
A
When white light is passed through a prism, it splits into seven different colours namely, red, orange, yellow, green, blue, indigo and violet. If we do the reverse, that is mix the beams of light of all colour, white light is obtained.
:
A
When white light is passed through a prism, it splits into seven different colours namely, red, orange, yellow, green, blue, indigo and violet. If we do the reverse, that is mix the beams of light of all colour, white light is obtained.
Latest Videos
Latest Test Papers
Login With Google
Old way of Login
Login With Email