Maharashtra Board 9th Science MCQ on Topic 11. Reflection of light

  1. ) The image formed by a plane mirror is of the same size as the source.

A ) True

B ) False

Ans A ) True

 2 ) The focal length of the concave mirror is ……………

A ) Positive

B ) Negative

C ) Positive and negative

D ) Neither positive nor negative

Ans B ) Negative

) Reflections from rough surfaces are regular.

A ) True

B ) False

Ans B ) False

) Reflection from smooth, flat surfaces is reflection.

A ) Regular B ) Reflected C ) Irregular D ) Refracted

Ans A ) Regular

) Polished surfaces absorb less light and so minimum light gets reflected.

A ) False

B ) True

Ans A ) False

) is electromagnetic radiation which causes the sensation of vision.

A ) Sound B ) Light C ) Touch

D ) All of these

Ans B ) Light

) A concave mirror is also called as mirror.

A ) Converging

B ) Plane

C ) Diverging

D ) All of these

Ans A ) Converging

) The type of mirror used in flood lights, shaving mirror is mirror.

A ) Convex B ) Concave C ) Plane

D ) All of them.

Ans B ) Concave

) A convex mirror is also called a mirror.

A ) Converging B ) Dispersing C ) Focusing

D ) None of these

Ans B ) Dispersing

) The centre of the sphere of which the mirror is a part, is called the ……………

A ) Pole

B ) Radius of curvature

C ) Centre of curvature

Ans C ) Centre of curvature

) What is the minimum height of the mirror required to see the full image of a person standing in front of the mirror.

A ) Double the height of the person

B ) Half of the person’s height

C ) Three fourth of the person’s height

D ) Same height of the person

Ans B ) Half of the person’s height

) In Convex mirror, the image is formed in front of the mirror.

A ) False

B ) True

Ans A ) False

) Images formed by the mirrors in the Laughing Chambers are …………….

A ) Same size B ) Same height C ) Distorted

D ) All of these

Ans C ) Distorted

) The of heat from the sun at a single point on the paper, burns the paper.

A ) Absorption

B ) Divergence C ) Convergence D ) Reflection.

Ans C ) Convergence

) Object is always kept on the side of the spherical mirror.

A ) Right

B ) Top

C ) Bottom

D ) Left.

Ans D ) Left.

) If the object is placed at an infinite distance, then the image formed by concave mirror is ……………

A ) Virtual & same size

B ) Real & point size

C ) Virtual & diminshed

D ) Real and magnified

Ans B ) Real & point size

) In head lamps of vehicles, the source of light is kept at the of the mirror.

A ) Pole

B ) Centre of curvature

C ) Focus

D ) Beyond centre of curvature

Ans C ) Focus

) An object is placed in front of a concave mirror of radius of curvature 40 cm at a distance of 10 cm. The magnification of the image is ……………

A ) 1 cm B ) 3 cm C ) 2 cm D ) 4 cm.

Ans C ) 2 cm

) The type of mirror used in street lights, head lamps of a car is mirror.

A ) Convex B ) Concave C ) Plane

D ) All of them.

Ans A ) Convex

) For real inverted images, formed by a concave mirror, magnification is ……………

A ) Positive.

B ) Negative

C ) Zero

D ) Infinite.

Ans B ) Negative

) The radius of the of which the mirror is a part, is called the radius of curvature of the mirror.

A ) Square B ) Cylinder C ) Sphere

D ) Rectangle.

Ans C ) Sphere

22 )

If the relation between the angle between the mirrors and the number of images formed is given by (n = 360° –

A

where n= number of images and A = angle between the mirrors. Then What is the number of images formed for 450.

A ) 2

B ) 3

C ) 7

D ) 11

Ans C ) 7

) A convex mirror has a focal length of 18 cm. The image of the object kept in front of the mirror is half the height of the object. The distance of the object from the mirror is ……………

A ) – 18 cm B ) – 15.5 cm C ) – 10 cm D ) – 16 cm.

Ans A ) – 18 cm

) The focal length of concave mirror is ……………

A ) Negative B ) Positive C ) Zero

D ) Infinite.

Ans A ) Negative

) The mirrors used in cars and motorcycles are mirrors.

A ) Concave

B ) Convex

C ) Plane

D ) Plano-Convex

Ans B ) Convex

) A convex mirror is also called as mirror.

A ) Converging

B ) Plane

C ) Diverging

D ) All of these

Ans C ) Diverging

) If the object is placed at the centre of curvature, then the image formed by concave mirror is ……………

A ) Virtual, erect & same size B ) Real, inverted & same size C ) Virtual, erect & diminshed

D ) Real, inverted and magnified.

Ans B ) Real, inverted & same size

) The rear view mirrors in cars are mirror.

A ) Plane

B ) Plain

C ) Curved

D ) None of these

Ans C ) Curved

) Principal focus of concave mirror lies …………… the mirror while principal focus of convex mirror lies ……………

the mirror.

A ) In front, in front

B ) Behind, in front of.

C ) Behind, behind.

D ) In front of, behind.

Ans D ) In front of, behind.

) The focal length of convex mirror is ……………

A ) Negative B ) Positive C ) Zero

D ) Infinite.

Ans B ) Positive

) has no unit since it is a ratio.

A ) Focal length

B ) Power

C ) Image distance

D ) Magnification.

Ans D ) Magnification.

) Radius of curvature of a spherical mirror is ……………

A ) Distance between centre of curvature and pole

B ) Distance between centre of curvature and principal focus.

C ) Distance between principal focus and pole.

D ) Half the length of the mirror.

Ans A ) Distance between centre of curvature and pole

) The type of mirror used in periscope, kaleidoscope is mirror.

A ) Spherical B ) Cylindrical C ) Plane

D ) All of them.

Ans C ) Plane

) mirrors are parts of a hollow glass sphere.

A ) Spherical

B ) Plain

C ) Plane

D ) None of these

Ans A ) Spherical

) An object placed at 20 cm from a concave mirror forms a real inverted image at a distance of 40 cm from the concave mirror. The focal length of the concave mirror is ……………

A ) 33.33 cm

B ) 30 cm

C ) -13.33 cm

D ) 23.33 cm

Ans C ) -13.33 cm

) Images formed by curved mirrors are from those formed by plane mirrors.

A ) Same

B ) Similar

C ) Different

D ) None of these

Ans C ) Different

) Spherical mirror whose outer surface is the reflecting surface is called a mirror.

A ) Convex B ) Concave C ) Plane

D ) All of them

Ans A ) Convex

) If the object is placed between the pole and focus, then the image formed by concave mirror is ……………

A ) Virtual, erect & magnified B ) Real, inverted & same size C ) Virtual, erect & diminshed

D ) Real, inverted and magnified.

Ans A ) Virtual, erect & magnified

) A mirror is a surface.

A ) Spherical B ) Reflecting C ) Refracting

D ) None of these

Ans B ) Reflecting

) A mirror is also known as focusing mirror.

A ) Convex B ) Concave C ) Plane

D ) All of them.

Ans B ) Concave

) The magnification of the mirror is 0.5. If the distance of the object from the mirror is 18 cm, then the distance of the image is ……………

A ) 36 cm B ) 9 cm C ) 90 cm D ) 54 cm.

Ans B ) 9 cm

) The image will be inverted and same size as the source when the object is placed at ……………

A ) Between focus and pole

B ) At focus

C ) At the centre of the curvature

D ) At infinity

Ans C ) At the centre of the curvature

) The incident ray and reflected ray are always on the of the normal.

A ) Same side

B ) Inclined

C ) Perpendicular

D ) Opposite side.

Ans D ) Opposite side.

) is taken as X – axis and all distances parallel to it are measured from the pole of the mirror.

A ) Focal length B ) Image height C ) Object height D ) Principal axis.

Ans D ) Principal axis.

) The straight line passing through the pole and centre of curvature of the mirror is called its ……………

A ) Pole

B ) Principal focus

C ) Principal axis

Ans C ) Principal axis

) The nature of the image formed by a convex mirror does not depend on the distance of the object from the mirror.

A ) True

B ) False

Ans A ) True

) The number of images obtained for an angle of 45° is ……………

A ) 2

B ) 3

C ) 5

D ) 7

Ans D ) 7

) The mirror displayed in laughing chamber are mirrors.

A ) Convex B ) Concave C ) Curved D ) Plane

Ans C ) Curved

) If the object is placed beyond the centre of curvature, then the image formed by concave mirror is ……………

A ) Virtual, erect & magnified B ) Real, inverted & same size C ) Virtual, erect & diminshed

D ) Real, inverted and diminished.

Ans D ) Real, inverted and diminished.

) The image formed by a plane mirror is a image.

A ) Real

B ) Virtual

C ) Inverted

D ) Diminshed

Ans B ) Virtual

) Light reflects differently from the various surfaces around us.

A ) True

B ) False

Ans A ) True

) mirror is used in street lamps.

A ) Diverging B ) Converging C ) Plane

D ) Wave

Ans A ) Diverging

) A concave mirror the rays of light falling on it.

A ) Refracts

B ) Diverges C ) Converges D ) Absorbs.

Ans C ) Converges

) The distance between the pole and the principal focus of the mirror is called the ……………

A ) Object distance

B ) Power

C ) Magnification

D ) Focal length

Ans D ) Focal length

) The image which is behind the mirror and cannot be obtained on a screen is called a image.

A ) Virtual

B ) Real

C ) Magnified

D ) Diminished

Ans A ) Virtual

) A surface which reflects light and creates clear images is called a ……………

A ) Sphere

B ) Opaque surface

C ) Mirror

D ) None of these

Ans C ) Mirror

57 )

Identify the mirror.

A ) Convex mirror

B ) Concave mirror

Ans B ) Concave mirror

) The distance between the pole and the principal focus of the mirror is called the ……………

A ) Pole

B ) Principal focus

C ) Focal length

Ans C ) Focal length

) The of the mirror is considered as the origin and all distances are measured from it.

A ) Focal length

B ) Radius C ) Power D ) Pole

Ans D ) Pole

) Distances measured vertically upwards from the principal axis are taken as & those measured in

vertically downward direction are taken as ……………

A ) Positive, positive B ) Negative, positive C ) Positive, negative

D ) Negative, negative.

Ans C ) Positive, negative

) Images formed by convex mirrors are always real.

A ) False

B ) True

Ans A ) False

) The number of images obtained for an angle of 60° is ……………

A ) 2

B ) 3

C ) 5

D ) 7

Ans C ) 5

) An object is kept at a distance of 25 cm in front of a concave mirror of focal length 15 cm. The position of the image is ……………

A ) 77.5 cm B ) 57.5 cm C ) 17.5 cm D ) 37.5 cm

Ans D ) 37.5 cm

) Light rays travel in all direction from a source.

A ) True

B ) False

Ans A ) True

) Equipment using solar energy use light.

A ) Diverging B ) Converging C ) Plane

D ) Wave

Ans B ) Converging

) In plane mirror, the reflected rays actually meet after reflection.

A ) False

B ) True

Ans A ) False

) Mirror formula is expressed as ……………

A ) 1/v + 1/u

B ) 1/v-1/u

C ) 1/v +1/u =1/f

D ) 1/v+1/u=f

Ans C ) 1/v +1/u =1/f

) According to the new sign convention, distance of the object form the pole is ……………

A ) v

B ) u

C ) f

D ) h

Ans B ) u

) is a surface which reflects light and creates clear images.

A ) Lens

B ) Mirror

C ) An axis

D ) Wave

Ans B ) Mirror

) When an object is placed between two plane mirrors inclined with each other at an angle 90°,

……………………. images of the object are formed.

A ) 5

B ) 7

C ) 2

D ) 3

Ans D ) 3

) During the phenomenon of reflection of light, the angle of incidence and the angle of reflection are ……………

A ) Different

B ) Zero C ) Infinite D ) Equal.

Ans D ) Equal.

) Light rays falling perpendicularly on the mirror are reflected back in the perpendicular direction.

A ) False

B ) True

Ans B ) True

) Rays of light appear to meet after reflection in convex mirror.

A ) True

B ) False

Ans A ) True

) The image formed by a concave mirror is ……………

A ) Always virtual

B ) Always real

C ) Virtual and inverted

D ) Virtual if the object is placed between the pole and the focus.

Ans D ) Virtual if the object is placed between the pole and the focus.

) Which of the following is used for drawing diagrams for image formed in a mirror?

A ) Laws of reflection B ) Laws of refraction C ) Laws of scattering D ) Both (1) and (2).

Ans A ) Laws of reflection

) If ‘h2’ is the size of the image and ‘h1’ is the size of the object, then magnification due to concave mirror is given by, ……………

M = h2

A ) h1

M = h1

B ) h2

Ans

C ) h2 – h1 = M

D ) h2 + h1 = M

M = h2

A ) h1

) Krishna is standing in front of two plane mirrors inclined at an angle ‘x’ with each other. If eight images of Krishna are formed, the angle ‘x’ between the mirrors is ……………

A ) 40°

B ) 50°

C ) 60°

D ) 30°

Ans A ) 40°

78 )

Identify the mirror. A ) Convex mirror

B ) Concave mirror

Ans A ) Convex mirror

) mirror always forms diminished and erect image of the object.

A ) Convex B ) Concave C ) Plane

D ) All of them

Ans A ) Convex

) images are formed in front of the mirror.

A ) Real

B ) Virtual

C ) Virtual and inverted

D ) Real and erect

Ans A ) Real

) If the inner surface of the spherical mirror is the reflecting surface, then it is called a mirror.

A ) Concave

B ) Convex

C ) Plane

Ans A ) Concave

) If the object is placed at the focus, then the image formed by concave mirror is ……………

A ) Virtual, erect & same size B ) Real, inverted & same size C ) Virtual, erect & diminshed

D ) Real, inverted and magnified.

Ans D ) Real, inverted and magnified.

) Image formed only when the reflected rays appear to meet at a point.

A ) Real Image

B ) Virtual Image

Ans B ) Virtual Image

) The magnification produced by a convex mirror of focal length 20 cm, at an object distance of 15 cm, from the mirror is ……………

A ) 4 / 7

B ) 6 / 7

C ) 2 / 7

D ) 3 / 7

Ans A ) 4 / 7

) Mirrors are of two types …………… and mirrors.

A ) Plane and Spherical B ) Spherical and curved C ) Plane and Reflecting D ) Smooth and Polished

Ans A ) Plane and Spherical

) The number of images obtained for an angle of 120° is ……………

A ) 2

B ) 3

C ) 5

D ) 7

Ans A ) 2

) images can be obtained on the screen.

A ) Real

B ) Inverted

C ) Curved

D ) None of these

Ans A ) Real

) The ratio of the height of the image to the height of the object is called the produced by the spherical

mirror.

A ) Object distance

B ) Power

C ) Magnification

D ) Focal length

Ans C ) Magnification

) An object of height 7 cm is kept at a distance of 25 cm in front of a concave mirror. The focal length of the mirror is 15 cm & size of the image is ……………

A ) 15.5 cm B ) – 10.5 cm C ) 15.0 cm D ) 0.15 cm.

Ans B ) – 10.5 cm

) For virtual images, the height of the image is ……………

A ) Positive

B ) Negative

C ) Neither positive nor negative

D ) Can be positive or Negative

Ans A ) Positive

) An object is placed in front of a concave mirror of focal length –20 cm at a distance of 10 cm. The position of image is ……………

A ) 40 cm B ) 10 cm C ) 20 cm D ) 80 cm

Ans C ) 20 cm

) When the object is placed at infinity, the image is formed is ……………

A ) Magnified B ) Very Large C ) Diminished

D ) Point images

Ans D ) Point images

93 )

If the relation between the angle between the mirrors and the number of images formed is given by (n = 360° –

A

where n= number of images and A = angle between the mirrors. Then What is the number of images formed for A = 1200.

A ) 2

B ) 3

C ) 5

D ) 7

Ans A ) 2

) Rays of light coming from a point behind the mirror.

A ) Object

B ) Point source

Ans B ) Point source

) The image formed is virtual and erect when the object is placed at ……………

A ) Between focus and pole

B ) Focus

C ) The centre of the curvature

D ) Beyond centre of curvature

Ans A ) Between focus and pole

) Magnification M is given by the formula ……………

A ) h2/h1 B ) u/v C ) h1/h2

D ) u.h2/v.h1

Ans A ) h2/h1

) According to the new sign convention, the of the mirror is taken as the origin.

A ) Object B ) Pole C ) Image

D ) Principal axis

Ans B ) Pole

) Letters are laterally inverted in the plane mirror.

A ) True

B ) False

Ans A ) True

) A concave mirror is also called a mirror.

A ) Plane

B ) Diverging

C ) Focusing

D ) None of these

Ans C ) Focusing

) Images formed by convex mirrors are magnified.

A ) True

B ) False

Ans B ) False

) In regular reflection, the reflection is obtained from a surface.

A ) Rough B ) Smooth C ) Opaque

D ) Perfectly black body

Ans B ) Smooth

) The letters of the English alphabet that form images same as the original letters are ……………

A ) C,H,I,M,D,T,U,V,W,X,Y

B ) B,H,I,O,R,S,T,U,V,W,X,Y

C ) A,H,M,O,P, T,U,V,X,Y,Z

D ) A,H,I,M,O,T,U,V,W,X,Y.

Ans D ) A,H,I,M,O,T,U,V,W,X,Y.

) mirror always forms virtual, erect and same size image as that of the object.

A ) Convex B ) Concave C ) Plane

D ) All of them.

Ans C ) Plane

) The relationship between object distance (u), image distance (v) and focal length (f) of a spherical mirror are related as ……………

A ) 1=1+1

 

f v u

B ) 1=1+1

v f u

C ) 1=1+1

 

u v f

D ) v + u = f

Ans A ) 1=1+1

 

f v u

) If the outer surface of the spherical mirror is the reflecting surface, then it is called a mirror.

A ) Concave B ) Convex C ) Plane

Ans B ) Convex

) For virtual erect images, formed by a concave mirror, magnification is ……………

A ) Positive. B ) Negative C ) Zero

D ) Infinite.

Ans A ) Positive.

) If ‘A’ is the angle between the plane mirrors, then the number of images (n) formed is given by, ……………

3600+

A ) n = A 1

B ) n=

3600

1 1

3600

C ) n = A 1

Ans

D ) 3600 + A = n

3600

C ) n = A 1

) is half of the radius of curvature of the mirror.

A ) Magnification

B ) Power

C ) Focal length

D ) Image distance

Ans C ) Focal length

) At the barber’s shop, mirror is used to obtain a erect, virtual and magnified image.

A ) Concave

B ) Plane C ) Convex D ) Lens

Ans A ) Concave

) The angle between the incident ray and normal is called ……………

A ) Angle of normal

B ) Angle of incidence C ) Angle of reflection D ) Angle of refraction

Ans B ) Angle of incidence

) The point at which the reflected rays meet at point in front of the spherical mirror is called ……………

A ) Principal axis B ) Principal Focus C ) Focal length

Ans B ) Principal Focus

) A vase is kept in front of two plane mirrors inclined at angle ‘A’ with each other. If four images of vase are formed, then the angle ‘A’ between the mirrors is ……………

A ) 62°

B ) 72°

C ) 52°

D ) 42°

Ans B ) 72°

) There are types of spherical mirrors.

A ) One

B ) Two

C ) Three

D ) None of these

Ans B ) Two

) The image in front of the mirror which can be obtained on a screen is called a image.

A ) Virtual

B ) Real

C ) Magnified

D ) Diminished

Ans B ) Real

) The number of images obtained for an angle of 30° is ……………

A ) 2

B ) 3

C ) 11

D ) 7

Ans C ) 11

) Spherical mirror whose inner surface is the reflecting surface is called a mirror.

A ) Convex B ) Concave C ) Plane

D ) All of them

Ans B ) Concave

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