Physics Mock Test

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Question 1
5 / -1

A transistor is

A
a voltage device

B
a resistance

C
a current device

D
an inductive device

Question 2
5 / -1

Sky appears blue because:

A
Blue light is scattered most

B
Red light is scattered most

C
Blue light is absorbed less in atmosphere

D
Blue light is absorbed more in atmosphere

Question 3
5 / -1

In Young's double slit experiment, if two independent sources are used then ________.

A
pattern disappears completely

B
permanent interference is obtained

C
the intensities do not remain fixed

D
none of the above

Question 4
5 / -1

If four similar charges are placed on the vertex of a square then the charge at B will tend to move:

A
Vertically

B
Horizontally

C
Diagonally inward

D
Diagonally outward

Question 5
5 / -1

The ratio of the wavelength of the monochromatic light A to the monochromatic light B is 1 : 2, then find the ratio of the momentum of the photon of light A to the photon of light B.

A
2 : 1

B
1 : 2

C
1 : 4

D
None of these

Question 6
5 / -1

Choose the correct relation between number of free electrons and number of holes in an intrinsic semiconductor.

A
Number of free electrons = Number of holes

B
Number of free electrons > Number of holes

C
Number of free electrons < Number of holes

D
Can’t predict

Question 7
5 / -1

A metal wire is subjected to a constant potential difference. When the temperature of the metal wire increases, the drift velocity of the electron in it

A
increases, thermal velocity of the electron decreases

B
decreases, thermal velocity of the electron decreases

C
increases, thermal velocity of the electron increases

D
decreases, thermal velocity of the electron increases

Question 8
5 / -1

Rays of light get refracted while passing from air to glass because

A
density of glass is higher than that of air

B
they cannot be reflected from a glass surface

C
glass absorbs energy from the light rays

D
speed of light in glass is less than the speed of light in air

Question 9
5 / -1

Which of the following is/are characteristics of electric charge?

A
Like charges repel each other and unlike charges attract each other

B
Charge is conserved

C
The force between two charges is governed by Coulomb's law.

D
All of the above

Question 10
5 / -1

What is not true for equipotential surface for uniform electric field?

A
Equipotential surface is flat

B
Equipotential surface is always spherical

C
Electric lines are perpendicular to equipotential surface

D
Work done is zero

Question 11
5 / -1

Light of wavelength 600 nm is incident normally on a slit of width 0.2 mm. The angular width of central maxima in the diffraction pattern is
(Measured from minimum to minimum)

A
6 × 10^-3 rad

B
4 × 10^-3 rad

C
2.4 × 10^-3 rad

D
4.5 × 10^-3 rad

Question 12
5 / -1

A current of 6 A enters one corner P of an equilateral triangle PQR having 3 wires of resistances 2Ω each and leaves by the corner R. Then the current I₁ and I₂ are

A
2 A, 4 A

B
4 A, 2 A

C
1 A, 2 A

D
2 A, 3 A

Question 13
5 / -1

Two long solenoids S₁ and S₂ have equal lengths and the solenoid S₁ is placed co-axially inside the solenoid S₂. If the radius of the inner solenoid is halved, then the mutual inductance of both the solenoids will become:

A
half

B
one-fourth

C
double

D
None of these

Question 14
5 / -1

The rms value of current in a 50 Hz AC circuit is 6 A. The average value of AC current over a cycle is

A
6√2

B
\(\frac{3}{{\pi \sqrt 2 }}\)

C
Zero

D
\(\frac{6}{{x\sqrt 2 }}\)

Question 15
5 / -1

If the two side band frequencies of a modulated wave are 1050 kHz and 950 kHz, then find the frequency of the modulating wave.

A
500 kHz

B
50 kHz

C
1000 kHz

D
None of these

Question 16
5 / -1

A 10 V reference source is designed from a 30 V supply using a Zener diode and a resistance. The test current of the Zener diode is 20 mA. If the supply voltage drops to 20 V, the Zener current will be:

A
5 mA

B
15 mA

C
20 mA

D
10 mA

Question 17
5 / -1

Nature and focal length of a lens of power (- 2 D) will be

A
convex lens, 50 cm

B
concave lens, 50 cm

C
convex lens, - 50 cm

D
concave lens, - 50 cm.

Question 18
5 / -1

An electric dipole of dipole moment p is placed in a uniform electric field of intensity E. If the initial and the final angular position of the dipole with respect to the electric field is θ₁ and θ₂ respectively then the amount of work done will be:

A
pE(sinθ₁ - sinθ₂)

B
pE(cosθ1 - cosθ2)

C
pE.cos(θ₂ - θ₁)

D
pE.sin(θ2 - θ1)

Question 19
5 / -1

The scattering of light by very small particles suspended in a gas or liquid is known as _______.

A
Graham's Law

B
Stefan's Law

C
Tyndall Effect

D
Avagadro's Law

Question 20
5 / -1

A current in a coil of inductance 5 H decreases at a rate of 2 Amp/sec. The induced emf is

A
2 V

B
5 V

C
10 V

D
- 10 V

Question 21
5 / -1

Two charges q₁ and q₂ are placed as shown in the figure.The force exerted by q₁ on q₂ is F₁₂. When a new charge q₃ is brought nearby, the magnitude of F₁₂ will be

A
3 times greater

B
reduces to half

C
same

D
increases

Question 22
5 / -1

Which of the following transistor configurations has the highest input impedance?

A
Common collector

B
Common Emitter

C
Common Base

D
All of the above

Question 23
5 / -1

Susceptibility of ferromagnetic materials is always:

A
Large and positive

B
Small and positive

C
Large and negative

D
Small and negative

Question 24
5 / -1

Which of the following quantity depends on the intensity of photon in photoelectric effect?

A
Photoelectric current

B
Maximum kinetic energy of photo electron

C
Stopping potential

D
Work function

Question 25
5 / -1

A horizontal metal wire of length 'L' is carrying an electric current 'i'. When this wire is placed in a magnetic field 'B', it experiences a force. What is the value of this force?

A
BiL

B
BiL²

C
Bi²L

D
B²iL

Question 26
5 / -1

The total equivalent capacitance of the series parallel combination of capacitors across A and B shown in figure is

A
4 μF

B
6 μF

C
16 μF

D
27 μF

Question 27
5 / -1

What type of radiation is emitted from a remote control?

A
Visible

B
Ultaviolet

C
Infrared

D
Radio frequency

Question 28
5 / -1

In a radioactive decay of a nucleus, an electron is also emitted. This may happen due to the fact that :

A
electrons are present inside a nucleus

B
an electron is created at the time of conversion of a neutron into proton

C
An electron is created at the time of conversion of a proton into a neutron

D
electrons need to be emitted for conservation of momentum

Question 29
5 / -1

For linearly polarized light the plane of polarization is

A
parallel to both the direction of polarization and the direction of propagation

B
parallel to the direction of polarization and perpendicular to the direction of propagation

C
perpendicular to both the direction of polarization and the direction of propagation

D
perpendicular to the direction of polarization and parallel to the direction of propagation

Question 30
5 / -1

A monochromatic ray of light is incident on a medium at an angle of 60°. The reflecting rays is found to be completely polarized. Then the refractive index of the medium is nearly

A
1.33

B
1.50

C
1.73

D
1.41

Question 31
5 / -1

If 'φ' is Electric flux through a closed surface 'S', 'q' is total charge enclosed by 'S' and є_o is the permittivity of free space, then these three are related by Gauss' Law formula __________.

A
φ = qє_o

B
φ = q/є_o

C
φ = є_o/q

D
φ = √(qє_o)

Question 32
5 / -1

What is the order of wavelength of X-rays, radio waves, micro wave and visible light?

A
Radio waves < Microwaves > Visible light > X-rays

B
Radio waves < Microwaves < Visible light < X-rays

C
Radio waves < Microwaves < Visible light > X-rays

D
Radio waves > Microwaves > Visible light > X-rays

Question 33
5 / -1

What will be the magnification when the object is placed at 2f from the pole of convex mirror

A
+1/3

B
+2/3

C
+1

D
3/2

Question 34
5 / -1

Capacitor A is charged by a 120 V battery and capacitor B is charged by 100 V battery. If the energy stored in both the capacitors is the same then find the ratio of the capacitance of capacitor A to capacitor B.

A
36 : 25

B
25 : 36

C
5 : 6

D
None of these

Question 35
5 / -1

Identify the given waveform

A
Positive half wave rectifier

B
Full wave rectifier

C
Dual full wave rectifier

D
Negative half wave rectifier

Question 36
5 / -1

To obtain maximum sensitivity and accuracy in a meter bridge, it is advised to obtain a null point at

A
left corner of the wire

B
right corner of the wire

C
middle of the wire

D
at any point of the wire

Question 37
5 / -1

_______ states that the electric current flowing through a metallic wire is directly proportional to the potential difference ‘V’ across its ends provided its temperature remains the same.

A
Joule’s law

B
Ohm’s law

C
Coulomb’s law

D
Ampere’s law

Question 38
5 / -1

A nuclear reactor is a device to produce nuclear energy with the help of

A
Nuclear fusion

B
Uncontrolled chain reaction

C
Controlled chain reaction

D
Graphite as fuel

Question 39
5 / -1

The magnetic dipole moment of a current loop is independent of

A
number of turns

B
area of the loop

C
current in the loop

D
magnetic field in which it is lying

Question 40
5 / -1

For a series LRC circuit, \(X_{L}\) vs frequency graph is:

A
Parallel to Y axis

B
Straight line with positive slope

C
Straight line with negative slope

D
Parallel to x axis

Question 41
5 / -1

The permanent magnetic moment of the atoms of a material is zero. The material

A
Must be paramagnetic

B
Must be diamagnetic

C
Must be ferromagnetic

D
May be paramagnetic

Question 42
5 / -1

Which among the following rays have lowest wavelength?

A
Ultraviolet rays

B
X rays

C
Gamma rays

D
All have equal wavelength

Question 43
5 / -1

The magnetic quantum number is related to

A
Shape

B
Size

C
Orientation

D
Spin

Question 44
5 / -1

optical fibers, through bent in any manner, allows light to pass through. What is the inference which can be drawn from it?

A
The concept that light travel in a straight path is wrong

B
Light can flow through the optical fibers

C
Light can travel through fibers because of their ductility

D
Light can travel through the fibers due to multiple total internal reflections

Question 45
5 / -1

Wave front is a imaginary surface, where:

A
phase difference are equal

B
everywhere phase is equal

C
phase difference is different

D
none of these

Question 46
5 / -1

A particle is moving three times as fast as an electron. The ratio of the de Broglie wavelength of the particle to that of the electron is 1.813 × 10^-4. The mass of the particle is (mass of electron m_e = 9.11 × 107^-31 kg)

A
6.752 × 10^-31kg

B
1.675 × 10^-35 kg

C
1.675 × 10^-24 kg

D
1.675 × 10^-27 kg

Question 47
5 / -1

The torque on a rectangular coil placed in a uniform magnetic field is large when the

A
Number of turns is large

B
Number of turns is less

C
Plane of the coil is perpendicular to the magnetic field

D
Area of the coil is small

Question 48
5 / -1

In case of a linear isotropic dielectric, when placed in an external electric field, the induced dipole moment is

A
in the direction of the field and is proportional to the field strength

B
in the opposite direction of the field and is proportional to the field strength

C
in the direction of the field and is inversely proportional to the field strength

D
in the opposite direction of the field and is inversely proportional to the field strength

Question 49
5 / -1

Effective resistance between A and B in the following circuit

A
10 Ω

B
20 Ω

C
5 Ω

D
\(\frac{20}{3}\text{ }\!\!\Omega\!\!\text{ }\)

Question 50
5 / -1

How much work is done in moving a charge of 5 C across two points having a potential difference of 16 V?

A
65 J

B
45 J

C
40 J

D
80 J

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Physics Mock Te...

Question 1

a voltage device

a resistance

a current device

an inductive device

Question 2

Blue light is scattered most

Red light is scattered most

Blue light is absorbed less in atmosphere

Blue light is absorbed more in atmosphere

Question 3

pattern disappears completely

permanent interference is obtained

the intensities do not remain fixed

none of the above

Question 4

Vertically

Horizontally

Diagonally inward

Diagonally outward

Question 5

2 : 1

1 : 2

1 : 4

None of these

Question 6

Number of free electrons = Number of holes

Number of free electrons > Number of holes

Number of free electrons < Number of holes

Can’t predict

Question 7

increases, thermal velocity of the electron decreases

decreases, thermal velocity of the electron decreases

increases, thermal velocity of the electron increases

decreases, thermal velocity of the electron increases

Question 8

density of glass is higher than that of air

they cannot be reflected from a glass surface

glass absorbs energy from the light rays

speed of light in glass is less than the speed of light in air

Question 9

Like charges repel each other and unlike charges attract each other

Charge is conserved

The force between two charges is governed by Coulomb's law.

All of the above

Question 10

Equipotential surface is flat

Equipotential surface is always spherical

Electric lines are perpendicular to equipotential surface

Work done is zero

Question 11

6 × 10-3 rad

4 × 10-3 rad

2.4 × 10-3 rad

4.5 × 10-3 rad

Question 12

2 A, 4 A

4 A, 2 A

1 A, 2 A

2 A, 3 A

Question 13

half

one-fourth

double

None of these

Question 14

6√2

\(\frac{3}{{\pi \sqrt 2 }}\)

Zero

\(\frac{6}{{x\sqrt 2 }}\)

Question 15

500 kHz

50 kHz

1000 kHz

None of these

Question 16

5 mA

15 mA

20 mA

6 × 10^-3 rad

4 × 10^-3 rad

2.4 × 10^-3 rad

4.5 × 10^-3 rad

pE(sinθ₁ - sinθ₂)

pE.cos(θ₂ - θ₁)

BiL²

Bi²L

B²iL