Physics Test

Result

Physics Test - 5

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Weekly Quiz Competition

Question 1
4 / -1

If the pitch of sound from a source appears to drop by 10% to a moving person, then what is the velocity of motion? (Velocity of sound = 330 m/s)

A
33 m/s

B
40 m/s

C
53 m/s

D
62 m/s

Solution
Question 2
4 / -1

An electromagnetic wave travelling in the x-direction has a frequency of 2 x 10¹⁴ Hz and electric field amplitude of 27 Vm^–1. From the options given below, which one describes the magnetic field for this wave?

A
q

B

C

D

Solution
Question 3
4 / -1

A string of negligible mass going over a clamped pulley of mass 'm' supports a block of mass 'M' as shown in the figure.

The force on the pulley by the clamp is given by

A
√2 Mg

B
√2 mg

C

D

Solution
Question 4
4 / -1

A planet has twice the density of earth but the acceleration due to gravity on its surface is exactly the same as that on the surface of earth. Its radius in terms of earth's radius R will be

A
R/4

B
R/2

C
R/3

D
R/8

Solution
Question 5
4 / -1

A
mg/2

B
mg

C
mg/4

D
mg/8

Solution
Question 6
4 / -1

A
only C

B
L and C

C
L and R

D
L and C

Solution
Question 7
4 / -1

The magnitude of acceleration of a moving body is equal to the

A
gradient of a displacement-time graph

B
gradient of a velocity-time graph

C
gradient of a displacement-velocity graph

D
area of a velocity-time graph

Solution
Question 8
4 / -1

The magnetic field of Earth at a given point is 0.5 × 10^-5 Wb/m². This field is to be neutralised by magnetic induction at the centre of a circular conducting loop of radius 5.0 cm. The current required to be passed through the loop is nearly

A
0.2 A

B
0.4 A

C
4 A

D
40 A

Solution
Question 9
4 / -1

If a carrier wave of 1 kHz is used to a carry signal, the wavelength of transmitting signal is

A
300 km

B
30 km

C
3 km

D
75 km

Solution
Question 10
4 / -1

A stone released with zero velocity from the top of a tower reaches the ground in 4 s. The height of the tower is (Given: g = 10 m/s²)

A
20 m

B
40 m

C
80 m

D
160 m

Solution