# 7th Class Science Lights and Sound Question Bank

### done Light

• A) Polished

B) Rough

C) Black painted

D) None of these

• A) a real image only

B) a virtual image only

C) Both real as well as virtual image

D) Neither real nor virtual image

• A) are scattered

B) remain parallel

C) are diverged

D) are converged

• A) convex mirrors

B) plane mirrors

C) concave mirrors

D) None of the above

• A) reflection

B) refraction

C) dispersion

D) None of these

• A) Plane mirror

B) Concave mirror

C) Convex mirror

D) None of these

• A) convex lens

B) concave lens

C) diverging lens

D) None of these

• A) refers to a magnifying glass

B) is a piece of transparent medium bounded by at least one spherical surface.

C) Both the above are correct.

D) None of these

• A) A plane mirror

B) A concave mirror

C) A convex mirror

D) All of the above

• A) $40{}^\circ$

B) $90{}^\circ$

C) $80{}^\circ$

D) $60{}^\circ$

• A) A plane mirror

B) A convex mirror

C) A convex lens

D) A concave lens

• A) A concave mirror

B) A concave lens

C) A convex mirror

D) A convex lens

• A) Water

B) Glass

C) Plastic

D) Clay

B) a transverse wave

C) mass less

D) All of the above

• A) 330 m/s

B) 300,000,000 m/s

C) 30,000 m/s

D) 300,000,000 km/s

• A) mode of travelling in curved lines

B) mode of travelling in straight lines

C) ability to bend around obstacles

D) displaying the phenomenon of diffraction

• A) Sun

B) Moon

C) Star

D) Filament

• A) reflected light reaches our eyes

B) the objects absorb all the light

C) the objects allow all the light to pass through them

D) None of the above

• A) rough surfaces

B) ideal surfaces

C) smooth surfaces

D) curved surfaces

• A) silver

B) copper

C) aluminium

D) platinum

• A) reflecting elliptical surface

B) reflecting spherical surface

C) reflecting parabolic surface

D) flat reflecting surface

• A) focal length

C) principal axis

D) diameter of curvature

• A) $30{}^\circ$

B) $60{}^\circ$

C) $90{}^\circ$

D) $120{}^\circ$

• A) if the length is measured opposite to the direction of the incident ray

B) if the length is measured in the direction of the incident ray

C) if the length is measured opposite to the direction of the refracted ray

D) none of these

• A) $0{}^\circ$

B) $50{}^\circ$

C) $90{}^\circ$

D) $25{}^\circ$

• A) absorbs all the amount of light incident on it

B) refracts all the light

C) reflects all the light

D) none of the above

• A) focus

B) center of curvature

C) optical centre

D) image point

• A) angle i = angle r

B) sine i = sine r

C) sine i / sine r = constant

D) All of these

• A) spliting of white light into seven colours

B) spliting of white light into five colours

C) spliting of white light into six colours

D) spliting of white light into any number of colours

• A) Convex lens

B) Concave lens

C) Both (a) and (b)

D) Neither (a) nor (b)

• A) solar colored band

B) spectrum

C) sonar

D) none of the above

• A) blue, green and yellow

B) yellow, blue and green

C) green, blue and yellow

D) yellow, green and blue

• A) violet

B) green

C) red

D) orange

• A) $90{}^\circ$

B) $45{}^\circ$

C) $180{}^\circ$

D) $0{}^\circ$

• A) refers to any curved mirror

B) refers to a mirror that is part of a sphere.

C) both the above are correct.

D) none of these is correct.

• A) is a type of spherical mirror whose reflecting surface is concave.

B) is a type of curved mirror whose reflecting surface is convex.

C) both the above are correct.

D) none of these is correct.

• A) has same size

B) is enlarged

C) is diminished

D) is blurred

• A) has same size

B) is enlarged

C) is diminished

D) is blurred

• A) At the edge

B) In the middle

C) Same every where

D) No definite shape

• A) erect

B) real

C) virtual

D) inverted

•  Column - I Column - II (A) Plane mirror (p) Forms real image (B) Convex mirror (q) Forms image of the same size as that of the object (C) Concave mirror (r) Always forms virtual images. (D) Concave lens (s) Always forms images that are virtual, erect and smaller than the object.

A) A$\to$ (p), B$\to$ (q), C$\to$ (r), D$\to$ (s)

B) A$\to$ (q), B$\to$ (r), C$\to$ (s), D$\to$ (p)

C) A$\to$ (q), B$\to$ (r), C$\to$ (p), D$\to$ (s)

D) A$\to$ (p), B$\to$ (s), C$\to$ (q), D$\to$ (r)

•  Column - I Column - II (A) Objects that have their own light (p) Non- Luminous (B) Object that do not have their own light (q) Luminous (C) Light ray falling on rough surface (r) Irregular reflection (D) Image formation in a mirror (s) Regular reflection

A) A$\to$ (p), B$\to$ (s), C$\to$ (q), D$\to$ (r)

B) A$\to$ (r), B$\to$ (p), C$\to$ (q), D$\to$ (s)

C) A$\to$ (p), B$\to$ (q), C$\to$ (r), D$\to$ (s)

D) A$\to$ (q), B$\to$ (p), C$\to$ (r), D$\to$ (s)

• A) larger in size

B) smaller in size

C) of the same size

D) none of these

• A) erect

B) of the same size as object

C) both (a) and (b)

D) none of these

• A) $60{}^\circ$

B) $30{}^\circ$

C) $45{}^\circ$

D) $90{}^\circ$

• A) $60{}^\circ$

B) $30{}^\circ$

C) $45{}^\circ$

D) $90{}^\circ$

• A) $60{}^\circ$

B) $30{}^\circ$

C) $45{}^\circ$

D) $90{}^\circ$

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Statement (1) is correct while statement (2) is incorrect

B) Statement (2) is correct while statement (1) is incorrect.

C) Both statements are correct

D) Both statements are incorrect.

• A) Statement (1) is correct while statement (2) is incorrect

B) Statement (2) is correct while statement (1) is incorrect.

C) Both statements are correct

D) Both statements are incorrect.

• A) A

B) B

C) C

D) D

• A) Some materials absorb light waves.

B) Some materials reflect light waves.

C) Light waves are refracted by some materials.

D) Light waves are emitted by some materials.

• A) $45{}^\circ ,\,\,40{}^\circ$

B) $55{}^\circ ,\,\,55{}^\circ$

C) $60{}^\circ ,\,\,60{}^\circ$

D) $30{}^\circ ,\,\,30{}^\circ$

• A)

B)

C)

D)

• A) $60{}^\circ$

B) $90{}^\circ$

C) $80{}^\circ$

D) $40{}^\circ$

• A)

B)

C)

D)

• A) A

B) B

C) C

D) D

• A) 3m

B) 5m

C) 6m

D) 8m

• A)

B) TAMSR

C) SMART

D) SMRAT

• A) erect and real

B) erect and virtual

C) inverted and virtual

D) inverted and real

B) absorbs light

C) Conducts light

D) reflects light

• A) Rainbow is always seen as a circle.

B) The colours in rainbow as seen by us from top to bottom are in the order, violet, indigo, blue, green, and yellow, orange, red.

C) The colours in rainbow as seen by us from top to bottom are in the order, red, orange, yellow, green, and blue, indigo, violet.

D) It can be either as in (b) or as in (c).

• A) convex mirror

B) concave mirror

C) plane mirror

D) None of these

• A) It acts as a convex lens

B) It acts as a convex mirror

C) It acts as a concave lens

D) It acts as a concave mirror

• A) 2m/s

B) 3 m/s

C) 5 m/s

D) 6 m/s

• A) glass

B) air

C) water

D) vacuum

• A) convex mirror

B) concave mirror

C) convex lens

D) concave lens

• A) virtual and smaller in size

B) real and smaller in size

C) virtual and bigger in size

D) real and bigger in size

• A) all the rays travel parallel to each other

B) all the rays spread from a point source of light

C) all the rays converge together to a single point

D) it travels in an irregular pattern

• A) angle between the source of light and the object is $45{}^\circ$

B) source of light and the object are parallel to each other

C) source of light and the object are perpendicular to each other

D) angle between the source of light and the object is $60{}^\circ .$

• A) It forms a magnified image wherever the object is place

B) It forms a magnified image only when the object is very close

C) It always forms diminished and erect images

D) It is not made of a transparent material

• A) a single image

B) two images

C) a large number of reflected images

D) no image

• A) concave

B) convex

C) plane

D) None of these

• A) A convex lens

B) Pinhole camera

C) A concave mirror when the object is placed at its centre of curvature

D) Convex mirror

• A) two rectangular and 3 triangular surfaces

B) two triangular and 3 rectangular surfaces

C) three triangular and 3 rectangular surfaces

D) none of the above

• A) reflection

B) refraction

C) scattering of light

D) rectilinear propagation of light

• A) hold it closer

B) hold it farther away

C) get a bigger mirror

D) none of these

• A) under no circumstances

B) when the object is very far from the mirror

C) when the object is at a distance equal to the radius of curvature of the mirror

D) when the distance of the object from the mirror is equal to the focal length of the mirror

• A) difference in wavelengths of the constituents of light

B) difference in speeds of various constituents of white light.

C) scattering of light by the surface of the glass prism

D) only b and a are correct

• A) Makes the emergent ray bend at angle to the direction of the incident ray

B) Angle of deviation is the angle between the incident ray produced and the emergent ray produced

C) Both (a) and (b)

D) Neither (a) nor (b)

• A) Concave mirror

B) Convex mirror

C) Plane mirror

D) Both (a) and (b)

• A) It is thicker at the edges and tapering in the middle

B) It forms virtual and erect image

C) It forms enlarged image

D) It forms diminished image

• A) molecules of carbon dioxide

B) tiny droplets of water

C) molecules of nitrogen dioxide

D) none of the above

• A) S

B) T

C) L

D) P

• A) Periscope

B) Kaleidoscope

C) Telescope

D) Thermo scope

• A) they produce magnified images of the objects.

B) they produce erect images of the objects.

C) they can spread the images over a large area

D) all of the above

• A) It bends inwards the light generally falling on it.

B) It converges the light generally falling on it

C) both the above are correct

D) none of these is correct

•  Column - I Column - II (A) Convex lens (p) Used by dentist to see enlarged image of teeth (B) Convex mirror (q) Used as a magnifying glass (C) Concave mirror (r) Can form image of the object spread over a large area. (D) Curved mirror (s) Common example of a spherical mirror

A) A$\to$ (p), B$\to$ (q), C$\to$ (r), D$\to$ (s)

B) A$\to$ (q), B$\to$ (r), C$\to$ (p), D$\to$ (s)

C) A$\to$ (r), B$\to$ (s), C$\to$ (q), D$\to$ (p)

D) A$\to$ (s), B$\to$ (p), C$\to$ (r), D$\to$ (q)

•  Column - I Column - II (A) Virtual image (p) Band of seven constituent colors (B) Headlight (q) Dispersion (C) Splitting of white light (r) Real image (D) Spectrum (s) Concave mirror (E) Image on retina (t) convex mirror

A) A$\to$ (s, t), B$\to$ (q), C$\to$ (s), D$\to$ (p), E$\to$ (r)

B) A$\to$ (r), B$\to$ (p), C$\to$ (s), D$\to$ (q), E$\to$ (s, t)

C) A$\to$ (s, t), B$\to$ (s), C$\to$ (q), D$\to$ (p), E$\to$ (r)

D) A$\to$ (r), B$\to$ (p), C$\to$ (q), D$\to$ (s), E$\to$ (s, t)

• A) a new spectrum will be formed on the screen with double the number of colours present in the previous spectrum

B) new spectrum will be obtained on the screen with only half the number of colours present in the previous spectrum

C) previous spectrum will disappear and we will obtain a white light formed by the fusion of the colours

D) a spectrum with same number of colours present in the previous spectrum will be formed but their wave lengths will be increased twice

• A) 1 colour

B) 3 colours

C) 5 colours

D) 7 colours

• A) The sunlight is white

B) The sunlight consists of five colours

C) The sunlight consists of seven colours

D) Both (a) and (c)

• A) erect

B) virtual

C) smaller in size

D) all of these

• A) concave mirror

B) convex mirror

C) plane mirror

D) none of these

• A) virtual

B) upside down

C) smaller

D) all of these

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Statement (1) and (3) are incorrect while statement (2) is correct.

B) Statement (1) and (2) are incorrect while (3) is correct.

C) All the statements are correct.

D) All the statements are incorrect.

• A) Statement (1) and (3) are incorrect while statement (2) is correct.

B) Statement (1) and (2) are incorrect while (3) is correct.

C) All the statements are correct.

D) All the statements are incorrect.

• A) 9m

B) 18m

C) 11m

D) 16m

• A) A rectangular glass slab

B) A convex lens

C) A concave lens

D) A prism

• A) $40{}^\circ$

B) $80{}^\circ$

C) $50{}^\circ$

D) $100{}^\circ$

• A)

B)

C)

D)