CBSE Class 12 Physics Part-II - Practice Test
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  2. Practice Tests
  3. CBSE Class 12 Physics Part-II
CBSE Class 12 Physics Part-II

CBSE Class 12 Physics Part-II - Practice Test

Detailed mock test covering Waves, Ray Optics, and Modern Physics. Includes complex problem-solving, experimental analysis, and contemporary physics applications.

2025-07-19
Pavan Pavan
CBSE Class 12 Physics Grade 12

Duration

30 min

Questions

30

Marking

Negative

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Questions Preview

What is the speed of light in vacuum?

A
3 × 10^8 m/s
B
2.99792458 × 10^8 m/s
C
3 × 10^9 m/s
D
1.5 × 10^8 m/s

Which of the following is true about the reflection of light?

A
The angle of incidence is always greater than the angle of reflection.
B
The incident ray, reflected ray, and the normal lie in the same plane.
C
The angle of reflection is less than the angle of incidence.
D
The incident ray is perpendicular to the surface.

What is the relation between the focal length and the radius of curvature of a spherical mirror?

A
f = R/2
B
f = 2R
C
f = R
D
f = R/3

According to Snell’s law, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant. What is this constant called?

A
Refractive index
B
Critical angle
C
Angle of deviation
D
Reflective index

What phenomenon occurs when light travels from a denser medium to a rarer medium at an angle greater than the critical angle?

A
Reflection
B
Refraction
C
Total internal reflection
D
Dispersion

What is the focal length of a concave mirror with a radius of curvature of 10 cm?

A
5 cm
B
10 cm
C
15 cm
D
20 cm

Which of the following is the correct equation for the mirror equation?

A
1/f = 1/v + 1/u
B
f = v + u
C
f = v - u
D
1/f = 1/v - 1/u

What is the magnification formula for a mirror?

A
m = v/u
B
m = h/h'
C
m = -v/u
D
m = u/v

In total internal reflection, which condition is necessary?

A
The angle of incidence must be less than the critical angle.
B
The angle of incidence must be greater than the critical angle.
C
The incident ray must be perpendicular to the surface.
D
The refractive index of the first medium must be less than the second medium.

Which optical phenomenon is responsible for the formation of rainbows?

A
Reflection
B
Refraction
C
Dispersion
D
Diffraction

What is the formula for calculating the refractive index between two media?

A
n = sin i / sin r
B
n = tan i / tan r
C
n = cos i / cos r
D
n = sin r / sin i

What is the purpose of an optical fiber?

A
To transmit light through total internal reflection
B
To bend light at sharp angles
C
To reflect light back to its source
D
To absorb light for energy storage

What is the power of a lens with a focal length of 0.5 m?

A
2 dioptres
B
1 dioptre
C
0.5 dioptre
D
5 dioptres

What is the refractive index of diamond?

A
1.33
B
1.52
C
1.62
D
2.42

What happens when the object distance is less than the focal length in a convex lens?

A
The image is real
B
The image is inverted
C
The image is virtual
D
The image is at infinity

What is the magnification formula for a simple microscope?

A
m = 1 + (D/f)
B
m = D/f
C
m = f/D
D
m = f+D

What is the focal length of a concave mirror with a radius of curvature of 15 cm?

A
7.5 cm
B
15 cm
C
30 cm
D
60 cm

What is the function of the eyepiece in a microscope?

A
To focus light on the object
B
To magnify the image formed by the objective lens
C
To increase the brightness of the image
D
To adjust the focus of the object

Which of the following is true about the image formed by a convex mirror?

A
The image is real and diminished
B
The image is virtual and magnified
C
The image is virtual and diminished
D
The image is real and magnified

What is the formula for the power of a lens?

A
P = 1/f
B
P = f/1
C
P = 1/f^2
D
P = 1/v

What does Snell's law describe?

A
The relationship between the angles of incidence and refraction
B
The reflection of light from a surface
C
The amount of light absorbed by a medium
D
The speed of light in different media

What happens when the angle of incidence exceeds the critical angle for total internal reflection?

A
Light refracts into the second medium
B
Total internal reflection occurs
C
The light is absorbed
D
The light bends towards the normal

In the context of refraction, what is the refractive index of air?

A
1.0
B
1.33
C
1.52
D
1.62

What is the formula for magnification in a simple microscope?

A
m = 1 + (D/f)
B
m = D/f
C
m = f/D
D
m = f+D

What is the refractive index of diamond?

A
1.33
B
1.52
C
1.62
D
2.42

What happens when light passes through a prism?

A
The light is reflected
B
The light bends towards the base of the prism
C
The light undergoes total internal reflection
D
The light is absorbed

What is the magnifying power of a compound microscope?

A
The ratio of the focal lengths of the objective and eyepiece
B
The sum of the focal lengths of the objective and eyepiece
C
The product of the magnifications produced by the objective and eyepiece
D
The ratio of the image size to the object size

What is the power of a lens with a focal length of 1.5 meters?

A
0.67 dioptres
B
1.5 dioptres
C
1.0 dioptres
D
2.0 dioptres

Which type of image is formed by a convex mirror?

A
Real and inverted
B
Real and erect
C
Virtual and erect
D
Virtual and inverted

Which optical device uses total internal reflection to transmit light?

A
Optical fiber
B
Prism
C
Concave mirror
D
Convex lens