Physics Test 174

Result

Physics Test 174

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Weekly Quiz Competition

Question 1
4 / -1

The dimensions of mobility are

A

B

C

D

Solution
Question 2
4 / -1

A body moving with a uniform acceleration crosses a distance of 65 m in the 5th second and 105 m in 9th second. How far will it go in 20 s?

A
2040 m

B
240 m

C
2400 m

D
2004 m
Question 3
4 / -1

A
60°

B
75°

C
45°

D
90°

Solution
Question 4
4 / -1

Tension in the cable supporting an elevator, is equal to the weight of the elevator. From this, we can conclude that the elevator is going up or down with a

A
uniform velocity

B
uniform acceleration

C
variable acceleration

D
either (b) or (c)

Solution

When tension in the cable is equal to the weight of cable, the system is in equilibrium. It means the system is at rest or moving with uniform velocity.
Question 5
4 / -1

A force acts on a 30 gm particle in such a way that the position of the particle as a function of time is given by where x is in metres and t is in seconds. The work done during the first 4 seconds is

A
576 mJ

B
450 mJ

C
490 mJ

D
530 mJ

Solution
Question 6
4 / -1

A circular disc of radius R rolls without slipping along the horizontal surface with constant velocity v0. We consider a point A on the surface of the disc, then the acceleration of the point A is

A
constant in magnitude as well as direction.

B
constant in direction

C
constant in magnitude

D
cannot say
Question 7
4 / -1

A diametrical tunnel is dug across the Earth. A ball is dropped into the tunnel from one side. The velocity of the ball when it reaches the centre of the Earth is .... (Given : gravitational potential at the centre of Earth

A
√R

B
√gR

C
√2.5 gR

D
√7.1gR

Solution
Question 8
4 / -1

Two wires A and B of same material and of equal length with the radii in the ratio 1 : 2 are subjected to identical loads. If the length of A increases by 8 mm, then the increase in length of B is

A
2 mm

B
4 mm

C
8 mm

D
16 mm

Solution
Question 9
4 / -1

A

B

C

D

Solution
Question 10
4 / -1

A long metallic bar is carrying heat from one of its ends to the other end under steady–state. The variation of temperature θ along the length x of the bar from its hot end is best described by which of the following figures?

A

B

C

D

Solution