Physics Test 80

Result

Physics Test 80

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Weekly Quiz Competition

Question 1
4 / -1

A block is resting over a smooth horizontal plane. A constant horizontal force starts acting on it at t = 0. Which of the following graph is correct.

A

B

C

D

Solution
Question 2
4 / -1

Which of the following statement are correct.

A
Work done by static friction is always zero

B
Work done by kinetic friction can be positive.

C
Kinetic energy of a system cannot be increased without applying any external force on system

D
Work energy theorem not valid in non–inertial frame.
Question 3
4 / -1

A force of acts on a body for 4 second, produces a displacement of . The power developed is

A
9.5 W

B
7.5 W

C
6.5 W

D
4.5 W

Solution
Question 4
4 / -1

Two particles A and B start from rest from source point in same direction and move on a circular path with angular acceleration 2 rad/s² and 3 rad/s² respectively. Find the minimum time after which they will cross each other :

A

B

C

D

Solution
Question 5
4 / -1

A rod of mass M and length L is suspended from its one end and is given angular velocity ω₀ at lowest position such that the rod occupies horizontal position momentarily and then return back. Find ω₀.

A

B

C

D

Solution
Question 6
4 / -1

If 2 bar magnets of different magnetic lengths have equal magnetic moments, then the pole strength is :

A
Equal for both the magnets

B
Lesser for shorter magnet

C
More for longer magnet

D
More for shorter magnet

Solution
Question 7
4 / -1

Time period of a freely suspended bar magnet does not depend upon :

A
length of the magnet

B
pole strength of the magnet

C
horizontal component of the earth's magnetic field

D
length of the suspension

Solution
Question 8
4 / -1

The magnet of a vibration magnetometer is heated so as to reduce its magnetic moment by 19%. By doing this the periodic time of the magnetometer will :

A
increases by 19%

B
decreases by 19%

C
increases by 11%

D
decreases by 21%

Solution
Question 9
4 / -1

Given figures (a) and (b) represent lines of force. Which is the correct statement ?

A
Figure-a represents magnetic lines of force

B
Figure-b represents magnetic lines of force

C
Figure-a represents electrostatic lines of force

D
Both figures (a) and (b) represent magnetic lines of force
Question 10
4 / -1

The magnetic field strength at a point at a distance 'd' from the centre, on the axial line of a very short bar magnet of magnetic moment M is B. The magnetic induction at a distance 2d from the centre, on the equatorial line of a magnet of magnetic moment 8M, will be :

A
4B

B
B/2

C
B/4

E
b

Solution