These TS 10th Class Physical Science Bits with Answers Chapter 1 Reflection of Light at Curved Surfaces will help students to enhance their time management skills.
TS 10th Class Physical Science Bits Chapter 1 Reflection of Light at Curved Surfaces
Question 1.
The surface of a polished metal spoon bulged outwards can be approximated to a ………………….. mirror. ( )
(A) convex
(B) plane
(C) concave
(D) cubical
Answer:
(A) convex
Question 2.
If the object Is at Infinity from a concave mirror the size of the image formed is ……………. . ( )
(A) highly enlarged
(B) point sized
(C) same size as object
(D) none of these
Answer:
(B) point sized
Question 3.
The image which cannot be caught on a screen Is called ( )
(A) enlarged image
(B) real image
(C) diminished image
(D) virtual Image
Answer:
(D) virtual Image
Question 4.
The mirror that can be used conveniently as shaving mirror. ( )
(A) plane mirror
(B) convex mirror
(C) concave mirror
(D) parabolic mirror
Answer:
(C) concave mirror
Question 5.
The Image formed by a plane mirror is ( )
(A) real
(B) virtual
(C) enlarged
(D) diminished
Answer:
(B) virtual
Question 6.
The principal focus of a spherical mirror is denoted by the letter. ( )
(A) F
(B) R
(C) C
(D) P
Answer:
(A) F
Question 7.
The centre of the reflecting surface of a spherical mirror Is called ( )
(A) pole
(B) focus
(C) centre of curvature
(D) null point
Answer:
(A) pole
Question 8.
In case of a concave mirror a ray parallel to the principal axis after reflection passes through. ( )
(A) centre of curvature
(B) pole
(C) focus
(D) centre of gravity
Answer:
(C) focus
Question 9.
A highly polished surface Is called ( )
(A) lens
(B) mirror
(C) prism
(D) glass slab
Answer:
(B) mirror
Question 10.
If u=25 cm, and v=37.5 cm, the focal length of the concave mirror is (observe the sign convention) ( )
(A) 31.25 cm
(B) 15 cm
(C) -15 cm
(D) -12.5 cm
Answer:
(C) -15 cm
Question 11.
The distances measured In the direction of incident light are taken ……………. in case of a spherical mirror: ( )
(A) +ve
(B) -ve
(C) either +ve or -ve
(D) none of these
Answer:
(A) +ve
Question 12.
Height of object or height of image is considered as …………. If measured downwards from principal axis : ( )
(A) +ve
(B) -ve
(C) either +ve or -ve
(D) none of these
Answer:
(B) -ve
Question 13.
If u’ is the object distance and ‘v’ is the image distance, the magnification, m = ()
(A) -v/u
(B) -u/v
(C) v/u
(D) v+u/u
Answer:
(A) -v/u
Question 14.
The distance between the principal focus and the pole of a curved mirror is called : ( )
(A) radius of curvature
(B) object distance
(C) image distance
(D) focal length
Answer:
(D) focal length
Question 15.
The centre of the sphere to which the concave mirror is a part is known as ()
(A) centre of curvature
(B) focus
(C) pole of mirror
(D) centre of gravity
Answer:
(A) centre of curvature
Question 16.
If the focal length of a concave mirror ì 50 cm, its radius of curvature is ( )
(A) 100 cm
(B) 25 cm
(C) 50 cm
(D) 75 cm
Answer:
(A) 100 cm
Question 17.
The surface of the head light of a motor vehicle is of ………………………. shape. ( )
(A) concave
(B) plane
(C) convex
(D) helix
Answer:
(C) convex
Question 18.
If the object is beyond ‘c’ of a concave mirror the nature of image is ( )
(A) real
(B) inverted
(C) diminished
(D) all of A,B & C
Answer:
(D) all of A,B & C
Question 19.
The ray which is emergent from the object and reaches the pole of the mirror is
……………………… to the principal axis ( )
(A) parallel
(B) normal
(C) inclined at 60°
(D) coincident
Answer:
(B) normal
Question 20.
To form a shadow the following are needed ( )
(A) source of light
(B) opaque object
(C) screen
(D) All of A, B & C
Answer:
(D) All of A, B & C
Question 21.
The line joining the pole of a curved mirror to its centre of curvature is called ( )
(A) coordinate axis
(B) princpal axis
(C) central axis
(D) none of these
Answer:
(B) princpal axis
Question 22.
When parallel rays are Incident on a concave mirror, on reflection they meet at the
(A) pole
(B) centre of curvature
(C) centre of mass
(D) focus
Answer:
(D) focus
Question 23.
The nature of Image formed when the object is placed between concave mirror and F is ( )
(A) real
(B) virtual
(C) diminished
(D) none of the above
Answer:
(B) virtual
Question 24.
The mirrors used by dentists to examine the teeth of a patient are ( )
(A) concave
(B) convex
(C) plane
(D) cylindrical
Answer:
(A) concave
Question 25.
The light ray emerging from the tip of object and passing through centre of curvature gets reflected ( )
(A) perpendicular to incident ray
(B) at an inclination of 60° to Incident ray
(C) along the same line
(D) along a line parallel to incident ray
Answer:
(C) along the same line
Question 26.
If the object is kept between F and C of a concave mirror the image Is formed
(A) at C
(B) between P and F
(C) at F
(D) beyond C
Answer:
(D) beyond C
Question 27.
A virtual enlarged image ¡s formed by a concave mirror when the object is kept ( )
(A) beyond C
(B) between Fand C
(C) between P and F
(D) at C
Answer:
(C) between P and F
Question 28.
Convention for the parameters connected to mirror equation is: All the distances should be measured from :
(A) centre of curvature
(B) foucs
(C) pole of mirror
(D) none of these
Answer:
(C) pole of mirror
Question 29.
The rearview mirror of a motor car is a ………………………. mirror ()
(A) convex
(B) concave
(C) hyperbolic
(D) cylindrical
Answer:
(A) convex
Question 30.
When torch light is focussed on a wall the beam observed is ()
(A) parallel
(B) focussed at a point
(C) convergent
(D) divergent
Answer:
(D) divergent
Question 31.
Reshma focussed a light ray onto the mirror and the light ray comes back in ( )
(A) broken line
(B) straight line
(C) curved line
(D) circle
Answer:
(B) straight line
Question 32.
Light ( )
(i) requires medium to propagate.
(ii) travels at a velocity of 3x 108m/s in air or vaccum.
(iii) travels in straight lines
Now which of the following statements are correct
(A) i & ii
(B) i, ii, & iii
(C) i only
(D) ii & iii only
Answer:
(D) ii & iii only
Question 33.
Out of the following identify the transparent medium ()
(i) cardboard
(ii) water
(iii) plywood sheet
(iv) air
(A) i & ii
(B) i & iii
(C) ii & iv
(D) i, ii & iii
Answer:
(C) ii & iv
Question 34.
Out of the following which is translucent medium? ()
(i) glass
(ii) stone
(iii) oil paper
(iv) ground glass
(A) iii & iv
(B) i & iii
(C) ii & iii
(D) i & iii
Answer:
(A) iii & iv
Question 35.
If heIght of image is hi and height of object is h0, then magnification, m is ()
(A) h0/hi
(B) hi/h0
(C) \(\frac{\mathrm{h}_{\mathrm{i}}-\mathrm{h}_{\mathrm{o}}}{\mathrm{h}_{\mathrm{o}}}\)
(D) \(\frac{\mathrm{h}_{\mathrm{i}}+\mathrm{h}_{\mathrm{o}}}{\mathrm{h}_{\mathrm{o}}} \)
Answer:
(B) hi/h0
Question 36.
Image distance is (-37.5 cm) and object distance is (-25.0 cm), magnification, m =
(A) -1.5
(B) 10/15
(C) 1.5
(D) 3
Answer:
(C) 1.5
Question 37.
The TV dish antenna resembles the shape of ( )
(A) convex mirror
(B) cylindrical mirror
(C) plane mirror
(D) concave mirror
Answer:
(D) concave mirror
Question 38.
“Light chooses the path which takes the least time to travel” This is known as ( )
(A) Huygens’ wave theory
(B) Newton’s corpuscular theory
(C) Fermat’s principle
(D) Snell’s law
Answer:
(C) Fermat’s principle
Question 39.
The angle between the normal at point of incidence and the incident ray Is called the angle of ( )
(A) reflection
(B) incidence
(C) refraction
(D) minimum deviation
Answer:
(B) incidence
Question 40.
The angle between the normal and reflected ray Is called ( )
(A) angle of incidence
(B) critical angle
(C) angle of deviation
(D) angle of reflection
Answer:
(D) angle of reflection
Question 41.
A collection of large number of light rays is called a …………………….. of light. ( )
(A) pack
(B) cluster
(C) beam
(D) wave
Answer:
(C) beam
Question 42.
When a collection of light rays travel parallel to one another such collection of rays is called ………………… beam of light. ( )
(A) convergent
(B) divergent
(C) parallel
(D) coincident
Answer:
(C) parallel
Question 43.
The path along which light energy travels in a given direction is called ……………… of light. ( )
(A) ray
(B) pack
(C) wave
(D) quantum
Answer:
(A) ray
Question 44.
When the rays of light coming from different directions meet at a point, then the collection or such rays is called ( )
(A) divergent beam
(B) parallel beam
(C) convergent beam
(D) none of these
Answer:
(C) convergent beam
Question 45.
When the rays of light starting from a point travel in different directions such collection of rays is called ( )
(A) divergent beam
(B) convergent beam
(C) parallel beam
(D) dispersed beam
Answer:
(A) divergent beam
Question 46.
A medium through which light can travel freely Is called ………………………. medium. ( )
(A) translucent
(B) opaque
(C) transparent
(D) none of these
Answer:
(A) translucent
Question 47.
Karuna observed her image on a mirror to be magnified. This is due to the beam of light gets : ( )
(A) converged
(B) diverged
(C) both A & B
(D) none
Answer:
(B) diverged
Question 48.
The bodies which emit light and act as sources of light are called ……………………. bodies. ( )
(A) luminous
(B) gloomy
(C) shining
(D) glowing
Answer:
(A) luminous
Question 49.
The ratio of the focal length of spherical mirror to its radius of curvature is ()
(A) 0.5
(B) 1
(C) 2
(D) 3
Answer:
(A) 0.5
Question 50.
The image formed by a concave mirror ( )
(A) is always real
(B) is always virtual
(C) can be both real and virtual
(D) none of these
Answer:
(C) can be both real and virtual
Question 51.
Starting from a long distance, a flame is moved towards a convex mirror. Then the image ( )
(A) decreases In size and moves towards pole
(B) increase in size and moves towards pole
(C) decrease in size and moves away from pole
(D) increase in size and moves away from pole
Answer:
(B) increase in size and moves towards pole
Question 52.
For real and inverted image magnification is ( )
(A) negative
(B) positive
(C) A and B
(D) none
Answer:
(A) negative
Question 53.
For a virtual and erect image magnification is ( )
(A) negative
(B) positive
(C) A and B
(D) none
Answer:
(A) negative
Question 54.
A ray which seems to be travelling through the focus of a convex mirror pass ……………… after reflection. ( )
(A) parallel to the axis
(B) along the same path in opposite direction
(C) through F
(D) through C
Answer:
(D) through C
Question 55.
The image formed by a concave mirror is virtual, erect and magnified. The position of object is ( )
(A) at Focus
(B) between focus and centre of curvature
(C) at pole
(D) between pole and focus
Answer:
(B) between focus and centre of curvature
Question 56.
In order to obtain a magnification of -2 with a concave mirror, the object should be placed. ( )
(A) between pole and focus
(B) between focus and centre of curvature
(C) at the centre of curvature
(D) beyond the centre of curvature
Answer:
(C) at the centre of curvature
Question 57.
The magnification of an object placed at a distance of 6cm in front of a concave mirror is — 3. It mears ( )
(A) The image Is formed at a distance of 2 cm in front of the mirror
(B) The image is formed at a distance of 2 cm in the mirror
(C) The image is formed at a distance of 18 cm in front of the mirror
(D) The image is formed at a distance of 18 cm in the mirror
Answer:
(C) The image is formed at a distance of 18 cm in front of the mirror
Question 58.
Convex mirror is used as ……………………. . ( )
(A) Shaving mirror
(B) Focussing mirror
(C) Rear-view mirror
(D) Vehicle head-lights reflector
Answer:
(C) Rear-view mirror