# Class 10 Science Chapter 10 MCQ

Class 10 Science Chapter 10 MCQ (Multiple Choice Questions) of Light – Reflection and Refraction. To score better and clear the doubts in Chapter 10 of 10th standard science, MCQs plays an effective role.

These MCQ Quiz includes almost all the intext questions as well as exercises questions also. MCQs are important for examination point of view in academic session 2021-2022.

## Class 10 Science Chapter 10 MCQ with Answers for 2021-2022

 Class: 10 Science Chapter: 10 Light – Reflection and Refraction Contents: MCQ Online Tests with Answers and Explanation

### Class 10 Science Chapter 10 MCQ Online Test for 2021-2022

Class 10 Science Chapter 10 MCQ Online Test with explanation and answers are given below. These are practice questions for the preparation of school exams and class tests also. All the questions and answers are confined to latest NCERT Textbooks for class x Science issued for academic session 2021-2022.

Q1

#### Which of the following statement is or are correct?

[A]. Light travels in a straight line.
[B]. Those objects which do not emit light themselves but only reflect the light which falls on them, are called non luminous objects.
[C]. Light enables us to see objects from which it come or from which it is reflected.
[D]. All the above
Q2

#### Consider the following statements and choose the incorrect one:

[A]. According to wave theory, light consists of electromagnetic waves which do not require a material medium for their propagation.
[B]. According to particle theory, light is composed of particle which travel in a straight line at very high speed.
[C]. The modern theory of light called “Quantum theory of light” combines both the wave and particle models of light.
[D]. None of the above
Q3

#### Anjali is writing some statements, choose the correct statement and help him:

[A]. The point at which the incident ray falls on the mirror is called the point of incidence.
[B]. The angle of incidence is the angle made by the incident ray with the normal at the point of incidence.
[C]. The normal is a line at right angle to the mirror surface at the point of incidence.
[D]. All the above
Q4

#### Atharva is doing his homework which is given by his teacher. Would you help him to choose the incorrect sentences?

[A]. According to the second law of reflection of light, the angle of reflection is always equal to the angle of incidence.
[B]. According to the first law of reflection of light, the incident ray, the reflected ray and the normal all lie in the same plane.
[C]. A ray of light which is incident normally on a mirror, is reflected back along the same path.
[D]. The laws of reflection of light applied to plane mirrors which have smooth surface.
Q5

#### Which of the following statement is or are incorrect?

[A]. A virtual image is formed when light rays coming from an object only appear to meet at a point when produced backwards, after reflection from a mirror.
[B]. A real image is formed when light rays coming from an object actually meet at a point after reflection from a mirror or refraction through a lens.
[C]. The image which can be obtained on a screen is called a virtual image.
[D]. While watching a movie in a cinema hall, we see the images of actors and actresses on the cinemas screen and it is an example of real image.

Q6

#### Badal appeared in class test but he confused to know the correct statement. Would you help him to know that?

[A]. A concave mirror is that spherical mirror in which the reflection of light takes place at the concave surface or bent in surface.
[B]. A convex mirror is that spiracle mirror in which the reflection of light take place at the convex surface or bulging out surface.
[C]. A spherical mirror works on the reflection of light.
[D]. All the above
Q7

#### Puja is writing some statements but she confused to know whether the statements are correct or not? If you know the answer to this question, then tell her:

[A]. The centre of curvature of a concave mirror is in front of it but the centre of curvature of a convex mirror is behind it.
[B]. The straight line passing through the centre of curvature and pole of a spherical mirror is called aperture of the mirror.
[C]. The portion of a mirror from which the reflection of light actually takes place is called the principal axis.
[D]. None of the above.
Q8

#### Rahul is writing some statements or rules for obtaining images formed by concave mirror. Choose the incorrect statements:

[A]. A ray of light which is parallel to the principal axis of a concave mirror, passes through its focus after reflection from the mirror.
[B]. A Ray of light passing through the centre of curvature of a concave mirror is reflected back along the same path.
[C]. A ray of light passing through the focus of a concave mirror becomes same to the principal axis after reflection.
[D]. A ray of light which is incident at a pole of a concave mirror is reflected back making the same angle with the principal axis.
Q9

#### These days New Cartesian Sign convention is used for measuring the various distance in the ray diagrams of spherical mirror. Choose the correct statements:

[A]. Distance measure downward and perpendicular to the principal axis are taken as negative.
[B]. Distance measured upward and perpendicular to the principal axis are taken as positive.
[C]. Distances measured against the direction of incident light are taken as negative.
[D]. All the above.
Q10

#### In a quiz competition, you are asked a question where you have to choose the statement which is/ are incorrect?

[A]. The bending of light when it goes from one medium to another obliquely is called refraction of light.
[B]. The refraction of light take place at the boundary between the two media.
[C]. The speed of light in air is 3 x 10 to power 18 m/s whereas that in glass is 2 x 10 to power 8 m/s.
[D]. Greater the difference in the speed of light in the two media, greater will be the amount of refraction or bending of light.

Q11

#### In a science quiz competition, Ritika are asked a question where she had to choose the statement which was/were incorrect?

[A]. Light waves travel faster in air but slower in glass.
[B]. The fact that the speed of light waves on one side of a beam of light changes a little before the change in speed of light waves on its other side, causes a change in the direction of light.
[C]. The refraction of light or change in direction of light on going from one medium to another can be explained by using the “wave theory” of light.
[D]. When light waves move from air into glass, their speed decreases but their wavelength increases.
Q12

#### Which of the following statement is or are incorrect?

[A]. A medium in which the speed of light is more is known as optically rarer medium (or less dense medium).
[B]. A medium in which the speed of light is less, is known as optically denser medium.
[C]. When a ray of light goes from a rarer medium to denser medium, it bends towards the normal.
[D]. When a ray of light goes from a denser medium to rarer medium, it bends towards from the normal.
Q13

#### In a science quiz competition, Kanak are asked a question where she had to choose the statement which was/were incorrect?

[A]. When a beam of light travelling in water enters into air, it bends towards the normal.
[B]. When a ray of light goes from air into water, it bends towards the normal.
[C]. The angle which the emergent ray makes with the normal is called the angle of emergence.
[D]. The perpendicular distance between the original path of incident ray and the emergent ray coming out of the glass slab is called lateral displacement of the emergent ray of light.
Q14

#### Which of the following statement is or are incorrect?

[A]. The stars appear to twinkle on a clear night.
[B]. When a thick glass slab is placed over some printed matter, the letters appear raised when viewed from the top.
[C]. A pool of water appears to be more deep than it actually is.
[D]. A stick pencil held obliquely and partly immersed in water appears to be bent at the water surface.
Q15

#### The image formed by a plane mirror is:

[A]. Virtual, behind the mirror and enlarged.
[B]. Virtual, behind the mirror and of the same size as the object.
[C]. Real, at the surface of the mirror and enlarged.
[D]. Real, behind the mirror and of the same size as the object.

Q16

[A]. 2 cm
[B]. 4 cm
[C]. 10 cm
[D]. 22 cm
Q17

#### According to New Cartesian Sign Convention:

[A]. Focal length of concave mirror is positive and that of convex mirror is negative
[B]. Focal length of both concave and convex mirrors is positive
[C]. Focal length of both concave and convex mirrors is negative
[D]. Focal length of concave mirror is negative and that of convex mirror is positive
Q18

#### Linear magnification produced by a concave mirror may be:

[A]. Less than 1 or equal to 1
[B]. More than 1 or equal to 1
[C]. Less than 1, more than 1 or equal to 1
[D]. Less than 1 or more than 1
Q19

#### In order to obtain a magnification of −2 (minus 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
Q20

#### A concave mirror produces magnification of +4. The object is placed:

[A]. At the focus
[B]. Between focus and centre of curvature
[C]. Between focus and pole
[D]. Beyond the centre of curvature

Q21

#### Which of the following statements is true?

[A]. A convex lens has 4 diopter power having a focal length 0.25 m
[B]. A convex lens has –4 diopter power having a focal length 0.25 m
[C]. A concave lens has 4 diopter power having a focal length 0.25 m
[D]. A concave lens has –4 diopter power having a focal length 0.25 m
Q22

#### Rays from Sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object?

[A]. 15 cm in front of the mirror
[B]. 30 cm in front of the mirror
[C]. Between 15 cm and 30 cm in front of the mirror
[D]. More than 30 cm in front of the mirror
Q23

#### A full-length image of a distant tall building can definitely be seen by using

[A]. A concave mirror
[B]. A convex mirror
[C]. A plane mirror
[D]. Both concave as well as plane mirror
Q24

#### In torches, search lights and headlights of vehicles the bulb is placed

[A]. Between the pole and the focus of the reflector
[B]. Very near to the focus of the reflector
[C]. Between the focus and center of curvature of the reflector
[D]. At the center of curvature of the reflector
Q25

[A]. Kerosene
[B]. Water
[C]. Mustard oil
[D]. Glycerin

### Class 10 Science Chapter 10 Extra Questions

##### What do you know about the diffraction of light?

If an opaque object on the path of light becomes very small, light has a tendency to bend around it and not walk in a straight line – an effect known as the diffraction of light.

##### Why do we use Convex mirrors as rear-view mirrors?

Convex mirrors are normally used as rear-view mirrors in vehicles. These mirrors are preferred because they always give an erect image. They have a wider field of view as they are curved outwards. In this way, convex mirrors enable the driver to view much larger area than would be possible with a plane mirror.

##### What is Snell’s law of refraction?

During the refraction of light, the ratio of sine of angle of incidence to the sine of angle of refraction is a constant, for the light of a given colour and for the given pair of media. This law is also known as Snell’s law of refraction.

##### What is meant by Power of a Lens?

The ability of a lens to converge or diverge light rays depends on its focal length. The power of a lens is defined as the reciprocal of its focal length.

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