MCQ Questions for Class 10 Science Chapter 10 Light Reflection and Refraction with Answers

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Light Reflection and Refraction Class 10 MCQs Questions with Answers

Question 1.
In following, which mirror makes diminished and virtual image of an object?
(a) Plane
(b) Concave
(c) Convex
(d) All the above
Answer:
(c) Convex

Question 2.
If an image is formed erect on putting object near the mirror but image is formed inverted on putting object far from the mirror, the mirror will be:
(a) Plane
(b) Concave
(c) Convex
(d) Plano convex
Answer:
(b) Concave

Question 3.
What will be the position and nature of the image of an object formed by a convex mirror placed between infinity and pole (P) of the mirror?
(a) In between P and F behind mirror virtual and erect
(b) In between Pand F behind mirror virtual and inverted
(c) Infront of mirror, real and erect.
(d) Infront of mirror virtual and erect (Here F is the focus)
Answer:
(a) In between P and F behind mirror virtual and erect

Question 4.
When an object should be placed in front of the concave mirror so that its image be erect and larger in si∠e?
(a) At the centre of curvature C of the mirror
(b) At the focus point F of the mirror
(c) In Between the centre of curvature C and the focus F of the mirror
(d) In between the pole P and the focus F of the mirror
Answer:
(d) In between the pole P and the focus F of the mirror

Question 5.
Focal length of a convex mirror is 12 cm. The radius of convex surface will be:
(a) 6 cm
(b) 12 cm
(c) 18 cm
(d) 24 cm
Answer:
(d) 24 cm

Question 6.
The image of an object is formed virtual and enlarged by:
(a) Convex mirror
(b) Concave mirror
(c) Plane mirror
(d) Concave lens
Answer:
(b) Concave mirror

Question 7.
Conjugate focus is possible only in:
(a) Convex mirror
(b) Concave mirror
(c) Plane mirror
(d) Simple glass
Answer:
(b) Concave mirror

Question 8.
The image of an object, which puts in front of convex mirror, is formed:
(a) At position of object
(b) At double distance of position of object
(c) At half distance of position of object
(d) Behind the mirror
Answer:
(d) Behind the mirror

Question 9.
The focal length of concave mirror is 10 cm. The radius of curvature of mirror will be:
(a) 10 cm
(b) 20 cm
(c) 30 cm
(d) 40 cm
Answer:
(b) 20 cm

Question 10.
The focal length of concave mirror is 15 cm. Its radius of curvature will be:
(a) 15 cm
(b) 30 cm
(c) 45 cm
(d) 60 cm
Answer:
(b) 30 cm

Question 11.
The focal length of plane mirror is:
(a) Zero
(b) Infinite
(c) 25 cm
(d) 25 cm
Answer:
(b) Infinite

Question 12.
The relationship between focal length and radius of curvature is:
(a) f = R
(b) f = \(\frac{1}{R}\)
(c) 2f = R
(d) f = 2R
Answer:
(c) 2f = R

Question 13.
The focal length of a convex mirror is 12 cm. The radius of convex surface of the mirror will be:
(a) 6 cm
(b) 12 cm
(c) 18 cm
(d) 24 cm
Answer:
(d) 24 cm

Question 14.
The object is placed at distance 10 cm in front of a plane mirror. The distance of image from mirror will be:
(a) 5 cm
(b) 10 cm
(c) 20 cm
(d) 0 cm
Answer:
(b) 10 cm

Question 15.
The image formed by a mirror is always straight whatever will be the distance, then mirror is:
(a) Only plane
(b) Only concave
(c) Only Convex
(d) Either plane or convex
Answer:
(a) Only plane

Question 16.
The image due to convex mirror is always formed:
(a) between centre of curvature and focus
(b) between centre of curvature and infinity
(c) between pole and focus
(d) anywhere
Answer:
(c) between pole and focus

Question 17.
When white light passes through a prism, maximum deviation be of:
(a) Red colour
(b) Yellow colour
(c) Violet colour
(d) Green colour
Answer:
(c) Violet colour

Question 18.
Out of yellow, violet, blue and red colours which will have a maximum wavelength?
(a) Red
(b) Blue
(c) Violet
(d) Yellow.
Answer:
(a) Red

Question 19.
When white light passes through a prism, the colour deviated to the base of prism is:
(a) Red
(b) Yellow
(c) Violet
(d) Green.
Answer:
(c) Violet

Question 20.
Refractive index of glass is maximum for:
(a) Red
(b) Violet
(c) Green
(d) Yellow
Answer:
(b) Violet

Question 21.
In following, which colour has minimum wavelength:
(a) Violet
(b) Red
(c) Blue
(d) Yellow.
Answer:
(a) Violet

Question 22.
The order of colours arranged in spectrum of white light is expressed as:
(a) VIBGYOR
(b) VIBYGOR
(c) VIBGOYR
(d) VIGBYOR
Answer:
(a) VIBGYOR

Question 23.
Out of seven colours of white light, which colour has maximum wavelength?
(a) Red
(d) Green
(c) violet
(d) Green
Answer:
(a) Red

Question 24.
When white light passes through a prism, minimum deviation is of:
(a) Voilet
(b) Red
(c) Green
(d) Yellow
Answer:
(b) Red

Question 25.
Out of seven colours of white light, which colour has maximum frequency:
(a) Red
(b) Violet
(c) Green
(d) Yellow
Answer:
(b) Violet

Question 26.
Phenomenon of total internal reflection occurs when light:
(a) enters from denser medium to rarer medium
(b) enters from rarer medium to denser medium
(c) enters from transparent medium to non-transparent medium
(d) enters from one medium to another medium having same refractive index
Answer:
(a) enters from denser medium to rarer medium

Question 27.
If angle of incidence is i and angle of refraction is r, then angular deviation will be:
(a) i + r
(b) i- r
(c) sin i / sin r
(d) sin r / sin i
Answer:
(b) i- r

Question 28.
If refractive index of glass with respect to air is 1.5, then the refractive index of air with respect to glass will be:
(a) 1/1.5
(b) 1.5
(c) 1.5 + 1
(d) 1.5 – 1
Answer:
(a) 1/1.5

Question 29.
The refractive indices of water and glass with respect to air are \(\frac{4}{3}\) and respectively. The refractive index of glass with respect to water will be:
(a) \(\left(\frac{3}{2}-\frac{4}{3}\right)\)
(b) \(\left(\frac{3}{2}+\frac{4}{3}\right)\)
(c) \(\left(\frac{3}{2} \div \frac{4}{3}\right)\)
(d) \(\left(\frac{3}{2} \times \frac{4}{3}\right)\)
Answer:
(c) \(\left(\frac{3}{2} \div \frac{4}{3}\right)\)

Question 30.
Refractive index of glass with respect to air is 3/2. The speed of light in air is :
(a) 1.5 × 10⁸ m/s
(b) 2 × 10⁸ m/s
(c) 3 × 10⁸ m/s
(d) 4.5 × 10⁸ m/s
Answer:
(b) 2 × 10⁸ m/s

Question 31.
Why colour of sky seems blue:
(a) due to reflection of light
(b) due to refraction of light
(c) due to scattering of light
(d) due to total internal reflection
Answer:
(c) due to scattering of light

Question 32.
Out of which colour is having maximum scattering:
(a) Red
(b) Violet
(c) Green
(d) Yellow
Answer:
(b) Violet

Question 33.
Which colour having minimum scattering?
(a) Red
(b) Voilet
(c) Green
(d) Yellow
Answer:
(a) Red

Question 34.
Which colour has maximum optical wavelength?
(a) Yellow
(b) Green
(c) Red
(d) Violet
Answer:
(c) Red

Question 35.
If angle of incidence is 42° and angle of refraction is 30°, then refracted ray is deviated by an angle:
(a) 12°
(b) 72°
(c) 1.4°
(d) sin 42°/sin 30°
Answer:
(a) 12°

Question 36.
When a white light passes through a glass prism which ray of colour deviated maximum:
(a) Yellow
(b) Violet
(c) Red
(d) Green
Answer:
(b) Violet

Question 37.
A light ray is incident normally on boundary surface of two media, then angle of refraction will be:
(a) 0°
(b) 45°
(c) 60°
(d) 80°
Answer:
(a) 0°

Question 38.
If refractive index of glass with respect to air is \(\frac{3}{2}\), then the refractive index of air with respect to glass will be:
(a) \(\frac{3}{2}\)
(b) \(\frac{1}{2}\)
(c) \(\frac{5}{2}\)
(d) \(\frac{2}{3}\)
Answer:
(d) \(\frac{2}{3}\)

Question 39.
If refractive index of glass with respect to air is 1.5, then the refractive index of air with respect to glass will be:
(a) 3.00
(b) 1.50
(c) 0.75
(d) 0.67
Answer:
(d) 0.67

Question 40.
To make an image real, inverted and larger than the object with a convex lens,
the object should be placed:
(a) On the focus of lens
(b) On the distance 2 f of lens
(c) Between fand 2 f of lens
(d) Between 2f and infinity
Answer:
(c) Between fand 2 f of lens

Question 41.
Speed of the light in air is 3 × 10⁸ m/s. The speed of the light in water. (re fractive index 4/3) will be:
(a) 2.25 × 10⁸ m/s
(b) 4.0 × 10⁸ m/s
(c) 2.0 × 10⁸ m/s
(d) 2.55 × 10⁸ m/s
Answer:
(a) 2.25 × 10⁸ m/s

Question 42.
Image formed by concave lens is always:
(a) virtual and diminished
(b) enlarged and erect
(c) diminished and inverted
(d) diminished and real.
Answer:
(a) virtual and diminished

Question 43.
If an object is kept at 2f in front of convex lens, the distance of image from lens will be:
(a) f
(b) 2f
(c) infinite
(d) between 2f and infinite
Answer:
(b) 2f

Question 44.
The object will be kept to form a real, inverted and enlarged image, at:
(a) focus (f)
(b) 2f
(c) between fand 2f
(d) between 2f and infinite
Answer:
(c) between fand 2f

Question 45.
Focal length of a lens is + 0.2 m, its power will be:
(a) 0.2D
(b) 50D
(c) -50D
(d) 5D
Answer:
(d) 5D

Question 46.
Power of a convex lens is 1 D. Its focal length will be:
(a) 50 cm
(b) 100 cm
(c) 25 cm
(d) 20 cm
Answer:
(b) 100 cm

Question 47.
Focal length of length, having power – 5D, will be:
(a) 0.2 m
(b) 0.5 m
(c) 0.2 m
(d) -0.5 m
Answer:
(c) 0.2 m

Question 48.
Speed of light in vacuum is 3 × 10⁸ m/sec. Then speed of light in glass (refractive index 1.5) will be:
(a) 4.5 × 10⁸ m/sec
(b) 2.0 × 10⁶ m/sec
(c) 3.0 × 10⁶ m/sec
(d) 2.0 × 10⁸ m/sec
Answer:
(d) 2.0 × 10⁸ m/sec

Question 49.
Focal length of a convex lens is 20 cm. Its power is:
(a) 20D
(b) 15D
(c) 10D
(d) 5D
Answer:
(d) 5D

Question 50.
Focal length of a convex lens is 2 m. The power of lens will be:
(a) + 0.5D
(b) + 5D
(c) + 50D
(d) – 5D
Answer:
(a) + 0.5D

Question 51.
In following, which is suitable lens for making virtual, erect and dimin ished image of object:
(a) Convex lens
(b) Concave lens
(c) Concave mirror
(d) Plane mirror
Answer:
(b) Concave lens

Question 52.
Concave lens forms image of object as:
(a) real, erect and enlarged
(b) virtual, erect and diminished
(c) real, inverted and diminished
(d) virtual, inverted and enlarged
Answer:
(b) virtual, erect and diminished

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