Physics Test 179

Result

Physics Test 179

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Weekly Quiz Competition

Question 1
4 / -1

A particle of mass m executes simple harmonic motion with amplitude a and frequency n. The average kinetic energy during its motion from the position of equilibrium to the end is

A

B

C

D

Solution
Question 2
4 / -1

A thick uniform rope of length L is hanging from a rigid support. A transverse wave of wavelength is set up at the middle of rope as shown in figure. The wavelength of the wave as it reaches to the topmost point is

A
2

B
√2

C
/√2

D
0

Solution
Question 3
4 / -1

The surface charge density of a thin charged disc of radius R is . The value of the electric field at the centre of the disc is . With respect to the field at the centre, the electric field along the axis at a distance R from the centre of the disc reduces by

A
70.7%

B
29.3%

C
9.7%

D
14.6%

Solution
Question 4
4 / -1

The electric potential V(x) in a region around the origin is given by V(x) = 4x² volts. The electric charge enclosed in a cube of 1 m side with its centre at the origin is (in coulomb)

A
80

B
–40

C
0

D
– 80

Solution

Charges reside only on the outer surface of a conductor with cavity.
Question 5
4 / -1

Twelve resistors each of resistance 16 W are connected in the circuit as shown. The net resistance between AB is

A
1

B
2

C
3

D
4

Solution
Question 6
4 / -1

An insulating rod of length l carries a charge q distributed uniformly on it. The rod is pivoted at its mid-point and is rotated at a frequency f about a fixed axis perpendicular to rod and passing through the pivot. The magnetic moment of the rod system is . Find the value of a.

A
6

B
4

C
5

D
8

Solution
Question 7
4 / -1

Two identical thin bar magnets each of length l and pole strength m are placed at right angles to each other, with north pole of one touching south pole of the other, then the magnetic moment of the system is

A
1 ml

B
2 ml

C
√2 ml

D
ml/2

Solution
Question 8
4 / -1

The self inductance of a long solenoid cannot be increased by

A
increasing its area of cross section

B
increasing its length

C
changing the medium with greater permeability

D
increasing the current through it

Solution
Question 9
4 / -1

A series R-C circuit is connected to an alternating voltage source. Consider two situations:

(A) When capacitor is air filled.

(B) When capacitor is mica filled.

Current through resistor is i and voltage across capacitor is V then :

A

B

C

D

Solution
Question 10
4 / -1

If E and B represent elctric and magnetic field vectors of the electromagnetic wave, the direction of propagation of electromagnetic wave is along

A

B

C

D

Solution