Your profile pic

physics MCQs

10th • Chapter 03

50 Questions TextBook
1

According to the laws of reflection, the angle of incidence is always ____ the angle of reflection.

A
greater than
B
less than
C
equal to
D
half of
2

A spherical mirror whose inner curved surface is reflecting is called a ____.

A
convex mirror
B
concave mirror
C
plane mirror
D
diverging mirror
3

The focal length (f) of a spherical mirror is ____ its radius of curvature (R).

A
equal to R
B
double R
C
one-half of R
D
one-fourth of R
4

For a concave mirror, the focus is located ____ the mirror.

A
behind
B
at the pole of
C
in front of
D
at infinity from
5

A mirror with its outer curved surface reflecting, which always forms a smaller, virtual, and erect image, is a ____.

A
concave mirror
B
plane mirror
C
convex mirror
D
parabolic mirror
6

The mirror formula is given by the equation ____.

A
1/f = 1/p - 1/q
B
f = p + q
C
1/f = 1/p + 1/q
D
f = p*q
7

The bending of light as it passes from one transparent medium to another is known as ____.

A
reflection
B
refraction
C
diffraction
D
dispersion
8

According to the sign conventions for mirrors, the focal length of a convex mirror is taken as ____.

A
positive
B
negative
C
zero
D
infinite
9

The ratio of the sine of the angle of incidence 'i' to the sine of the angle of refraction 'r' is a constant called the ____.

A
refractive index
B
reflection index
C
critical angle
D
power
10

What is the refractive index of water as mentioned in the text?

A
1.00
B
1.52
C
1.33
D
2.42
11

The speed of light is highest in which medium listed in the text?

A
Water
B
Glass
C
Diamond
D
Air
12

The angle of incidence in a denser medium for which the angle of refraction in the rarer medium is 90° is called the ____.

A
angle of reflection
B
angle of deviation
C
critical angle
D
refracting angle
13

Total internal reflection occurs when the angle of incidence is ____ the critical angle.

A
less than
B
equal to
C
greater than
D
half of
14

The critical angle for water, as calculated in the text, is ____.

A
42°
B
90°
C
48.8°
D
30°
15

Which phenomenon is responsible for the working of optical fibres?

A
Refraction
B
Dispersion
C
Diffraction
D
Total internal reflection
16

In an optical fibre, the inner part that carries the light is called the ____.

A
cladding
B
shell
C
core
D
jacket
17

The cladding of an optical fibre has a ____ refractive index compared to the core.

A
higher
B
lower
C
equal
D
negative
18

A lens which causes incident parallel rays to converge at a point is a ____ lens.

A
convex
B
concave
C
diverging
D
plano-concave
19

The SI unit for the power of a lens is ____.

A
Metre
B
Watt
C
Joule
D
Dioptre
20

A power of 1 Dioptre corresponds to a lens with a focal length of ____.

A
1 cm
B
100 cm
C
1 metre
D
0.1 metre
21

The power of a concave lens is always considered ____.

A
positive
B
negative
C
zero
D
infinite
22

Which principal ray passes undeviated through a lens?

A
The ray parallel to the principal axis
B
The ray passing through the focal point
C
The ray passing through the optical centre
D
The ray hitting the edge of the lens
23

To be used as a simple microscope or magnifying glass, an object must be placed ____ a convex lens.

A
at 2F
B
beyond 2F
C
within the focal length of
D
at F on
24

A simple camera uses a ____ to form a real, inverted, and diminished image on the film.

A
diverging lens
B
concave mirror
C
converging lens
D
plane mirror
25

The magnifying power of a simple microscope is given by the formula ____, where d is the near point distance.

A
M = 1 + f/d
B
M = 1 + d/f
C
M = d * f
D
M = 1 - d/f
26

The ability of an instrument to distinguish between two closely placed objects is its ____.

A
magnifying power
B
resolving power
C
focal power
D
refracting power
27

In a compound microscope, the objective lens has a ____ focal length.

A
long
B
very short (e.g., < 1 cm)
C
medium (e.g., 10 cm)
D
negative
28

In a refracting telescope, the objective lens has a ____ focal length compared to the eyepiece.

A
smaller
B
equal
C
larger
D
negative
29

In the human eye, which part controls the amount of light entering?

A
Retina
B
Cornea
C
Lens
D
Iris
30

The ability of the eye to change its focal length to see objects at various distances is called ____.

A
resolution
B
magnification
C
accommodation
D
refraction
31

The near point for a person with normal vision in their early twenties is about ____.

A
10 cm
B
25 cm
C
50 cm
D
100 cm
32

Nearsightedness (myopia) is a defect where a person cannot see ____ objects clearly.

A
near
B
all
C
distant
D
bright
33

Myopia is corrected using a ____ lens.

A
convex
B
converging
C
plano-convex
D
diverging
34

Farsightedness (hypermetropia) is corrected using a ____ lens.

A
concave
B
diverging
C
converging
D
plano-concave
35

In hypermetropia, the image of a nearby object is formed ____ the retina.

A
in front of
B
on
C
behind
D
to the side of
36

The reflection from a rough surface, where light reflects in many directions, is called ____ reflection.

A
regular
B
specular
C
irregular
D
total
37

Which of the following quantity does not change during the refraction of light?

A
its speed
B
its direction
C
its wavelength
D
its frequency
38

An endoscope uses ____ to view the internal organs of a body.

A
lenses only
B
mirrors only
C
fibre-optic tubes
D
X-rays
39

A converging lens can form a virtual image only if the object is placed ____.

A
at F
B
at 2F
C
between the lens and F
D
beyond 2F
40

The magnification formula for a lens is m = q/p. For a concave lens that forms an image at -10 cm from an object at 30 cm, the magnification is ____.

A
3
B
1/3
C
-3
D
-1/3
41

A parabolic mirror is specifically mentioned for use in ____.

A
dentist mirrors
B
head lights
C
security mirrors
D
telescopes
42

The image you see in a plane mirror is ____.

A
real and inverted
B
virtual and inverted
C
real and erect
D
virtual and erect
43

For a convex mirror, the focus and centre of curvature lie ____ the mirror.

A
in front of
B
behind
C
on the surface of
D
at infinity from
44

In a slide projector, the object (slide) is placed ____ the projection lens.

A
at F
B
between F and 2F
C
at 2F
D
beyond 2F
45

A compound microscope uses how many converging lenses?

A
One
B
Two
C
Three
D
Four
46

The final image formed by an astronomical telescope is ____.

A
real and erect
B
real and inverted
C
virtual and erect
D
virtual and inverted
47

The coloured part of the human eye is the ____.

A
pupil
B
retina
C
iris
D
cornea
48

What is the refractive index of diamond given in the table?

A
1.33
B
1.52
C
2.21
D
2.42
49

If a ray of light in glass (denser) strikes the air (rarer) surface at an angle greater than the critical angle, the ray will be ____.

A
refracted
B
absorbed
C
partially reflected
D
totally reflected
50

The image formed by a camera on the film is ____.

A
virtual, erect, magnified
B
real, inverted, diminished
C
virtual, inverted, diminished
D
real, erect, same size