Physics Test

Question 1
1 / -0

(A) The drift velocity of electrons decreases with the increase in the temperature of conductor.

(B) The drift velocity is inversely proportional to the area of cross-section of given conductor.

(C) The drift velocity does not depend on the applied potential difference to the conductor.

(D) The drift velocity of electron is inversely proportional to the length of the conductor.

(E) The drift velocity increases with the increase in the temperature of conductor.

Choose the correct answer from the options given below :

A
(A) and (B) only

B
(A) and (D) only

C
(B) and (E) only

D
(B) and (C) only

Question 2
1 / -0

The peak voltage of a message signal and the carrier wave are 15 volts and 30 volts respectively. Find the modulation index.

A
2

B
0.5

C
0.33

D
None of these

Question 3
1 / -0

A conducting loop carrying a current $I$ is placed in a uniform magnetic field pointing into the plane of the paper as shown. The loop will have a tendency to

A
Contract

B
Expand

C

Move towards $+v e x-a \xi s$

D

Move towards $-v e x-a \xi s$

Question 4
1 / -0

A wire tension 225 N produces 6 beats per second when it tuked with a fork, when the tension changed to 256 N, it again tuned with the same tuning fork to no. of beats remained unchanged, the frequency of tuning fork will be :

A
186

B
280

C
225

D
256

Question 5
1 / -0

Which of the following represents the binding energy of a nucleus?

A
The average energy of each nucleon

B
The energy needed to split the nucleus into its parts

C
The mass-energy difference between protons and neutrons

D
The energy necessary to overcome the neutron-neutron repulsion

Question 6
1 / -0

For one dimensional motion, the force F(x) and the potential energy U(x) are related as:

A
$F(x)=\frac{-d U(x)}{d x}$

B
$F(x)=\frac{d U(x)}{d x}$

C
$U(x)=\frac{d F(x)}{d x}$

D
$U(x)=\frac{-d F(x)}{d x}$

Question 7
1 / -0

A wire of length L meters carrying a current I amperes is bent in the form of a circle. The magnitude of the magnetic moment is:

A
$\frac{L I^{2}}{2 π}$

B
$\frac{L I^{2}}{4 π}$

C
$\frac{L^{2} I}{2 π}$

D
$\frac{L^{2} I}{4 π}$

Question 8
1 / -0

The transverse displacement $y(x, t)$ of a wave on a string is given by $y(x, t)=e^{-\left(a x^{2}+b t^{2}+2 \sqrt{(a b)} x t\right)}$. This represents a:

A
Wave moving in + x-direction with speed $\sqrt{\frac{a}{b}}$

B
Wave moving in - x-direction with speed $\sqrt{\frac{b}{a}}$

C
Standing wave of frequency $\sqrt{b}$

D
Standing wave of frequency $\frac{1}{\sqrt{b}}$

Question 9
1 / -0

If a liquid is heated in space under no gravity, the transfer of heat will take place by process of:

A
Conduction

B
Convection

C
Radiation

D
None of these

Question 10
1 / -0

Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A):

The stretching of a spring is determined by the shear modulus of the material of the spring.

Reason (R):

A coil spring of copper has more tensile strength than a steel spring of same dimensions.

In the light of the above statements, choose the most appropriate answer from the options given below:

A
(A) is true but (R) is false

B
(A) is false but (R) is true

C
Both (A) and (R) are true and (R) is the correct explanation of (A)

D
Both (A) and (R) are true and (R) is not the correct explanation of (A)

Submit Test

Physics Test - ...

Question 1

(A) and (B) only

(A) and (D) only

(B) and (E) only

(B) and (C) only

Question 2

2

0.5

0.33

None of these

Question 3

Contract

Expand

Move towards \(+v e x-a \xi s\)

Move towards \(-v e x-a \xi s\)

Question 4

186

280

225

256

Question 5

The average energy of each nucleon

The energy needed to split the nucleus into its parts

The mass-energy difference between protons and neutrons

The energy necessary to overcome the neutron-neutron repulsion

Question 6

\(F(x)=\frac{-d U(x)}{d x}\)

\(F(x)=\frac{d U(x)}{d x}\)

\(U(x)=\frac{d F(x)}{d x}\)

\(U(x)=\frac{-d F(x)}{d x}\)

Question 7

LI22π

LI24π

L2I2π

L2I4π

Question 8

Wave moving in + x-direction with speed \(\sqrt{\frac{a}{b}}\)

Wave moving in - x-direction with speed \(\sqrt{\frac{b}{a}}\)

Standing wave of frequency \(\sqrt{b}\)

Standing wave of frequency \(\frac{1}{\sqrt{b}}\)

Question 9

Conduction

Convection

Radiation

None of these

Question 10

(A) is true but (R) is false

(A) is false but (R) is true

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are true and (R) is not the correct explanation of (A)

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Question Analysis

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$\frac{L I^{2}}{2 π}$

$\frac{L I^{2}}{4 π}$

$\frac{L^{2} I}{2 π}$

$\frac{L^{2} I}{4 π}$