# 7th Class Science Lights and Sound Question Bank

### done Light

• A) A plane mirror sometimes forms an inverted image.

B) A concave mirror always forms a virtual, erect and diminished image.

C) A concave lens always forms a virtual, erect and diminished image.

D) All of the above

• A) A prism

B) A plane mirror

C) A concave mirror

D) A convex lens

• A) Electric lamp

B) Tube light

C) Torch

D) The sun

• A) Curvilinear

B) Rectilinear

C) Random

D) Circular

• A) Travelling in curved lines

B) Travelling in straight lines

C) The ability to bend around obstacles

D) The display of the phenomenon of diffraction

• A) An object that can absorb light

B) An object that can reflect light

C) An object that can refract light

D) An object that can emit light

• A) The sun

B) The moon

C) The star

D) The filament

• A) Rectilinear propagation of light

B) Curvilinear propagation of light

C) Total internal reflection

D) Refraction

• A) Convergent

B) Divergent

C) Parallel

D) Irregular

• A) Ray

B) Beam

C) Twilight

D) Sunlight

• A) $30{}^\circ$

B) $60{}^\circ$

C) $90{}^\circ$

D) $120{}^\circ$

• A) A single colour

B) Primary colours

C) Five colours

D) Seven colours

• A) Everything is black in colour.

B) Our eyes do not work in darkness.

C) No light reaches our eyes.

D) All the light gets scattered.

• A) Rough surface

B) Ideal surface

C) Smooth surface

D) Curved surface

• A) Light absorbed by an object

B) Light that enters our eyes after it is reflected by an object

C) Light dispersed by an object

D) Light refracted through the object

• A) $80{}^\circ$

B) $100{}^\circ$

C) $160{}^\circ$

D) $20{}^\circ$

• A) Convex mirror

B) Convex lens

C) Plane mirror

D) Concave mirror

• A) $50{}^\circ$

B) $100{}^\circ$

C) $130{}^\circ$

D) $80{}^\circ$

• A) Concave lens

B) Convex mirrors

C) Plane mirrors

D) Convex lenses

• A) Concave mirrors

B) Plane mirrors

C) Convex mirrors

D) Concave lens

• A) Red

B) Yellow

C) Blue

D) Green

• A) An erect, virtual and diminished image

B) An erect, real and diminished image

C) An erect, real and enlarged image

D) A virtual, erect and enlarged image

• A) Convex mirrors

B) Concave mirrors

C) Plane mirrors

D) Concave lens

• A) A reflecting, elliptical surface

B) A reflecting, spherical surface

C) A reflecting, parabolic surface

D) A flat, reflecting surface

• A) It cannot be captured on a screen.

B) It can be captured on a screen.

C) It can be captured only on a celluloid screen.

D) It is always magnified.

• A) Convex lens

B) Pinhole camera

C) Concave mirror

D) Convex mirror

• A) The right 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 upper part of the object will be at the bottom of the object.

D) The right side of the object will be on the left side of the image.

• A) Concave

B) Plane

C) Convex

D) All of the above

• A) They reflect light better than othel mirrors.

B) They produce images which are clearer than those produced by others

C) They produce magnified images.

D) They give a wide field of view.

• A) Light travels in straight lines.

B) Images are always inverted.

C) Image gets inverted when the light travels through a hole.

D) There is no specific reason.

• A) 6.4 m

B) 6.8 m

C) 6 m

D) 5.2 m

• A) The image lies between the pole and focus.

B) The image is diminished in size.

C) The image is erect.

D) The image is real.

• A)

B)

C)

D)

• A) White light is a mixture of seven colours.

B) The different colours of light is reflected at different angles in a glass prism.

C) The prism adds colour to the white sunlight.

D) Light travels at high speed.

• A) Plane mirror

B) Convex mirror

C) Concave mirror

D) Concave lens

• A) Plane mirror

B) Convex lens

C) Concave lens

D) Convex mirror

• A) 4

B) 8

C) 9

D) 11

•  Column I Column II a. Plane mirror 1. Used as a magnifying glass b. Convex mirror 2. Can form images of objects spread over a large area c. Convex lens 3. Used by dentists to see enlarged images of teeth d. Concave mirror 4. 1 mage is erect and of the same size as the object e. Concave lens 5. The image is erect and smaller than the object

A) a-4, b-5, c-3, d-1, e-2

B) a-4, b-5, c-1, d-3, e-2

C) a-4, b-3, c-2, d-5, e-1

D) a-4, b-1, c-3, d-2, e-5

• A) $30{}^\circ$

B) $45{}^\circ$

C) $60{}^\circ$

D) The reflected ray from mirror ?2? will be parallel to the surface of mirror '3'