Physics Test 176

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Physics Test 176

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Question 1
4 / -1

In an experiment four quantities a, b, c and d are measured with percentage error 1%, 2%, 3% and 4% respectively. Quantity P is calculated as error in P is

A
10%

B
7%

C
4%

D
14%

Solution
Question 2
4 / -1

A body is thrown vertically up with a velocity u. It passes three points A, B and C in its upward journey with velocities respectively. The ratio of AB and BC is

A
20 : 7

B
2

C
10 : 7

D
1

Solution
Question 3
4 / -1

An artillary piece which consistently shoots its shells with the same muzzle speed has a maximum range R. To hit a target which is R/2 from the gun and on the same level, the elevation angle of the gun should be

A
15°

B
45°

C
30°

D
60°

Solution

Range of a projectile is maximum when it is projected at an angle of 45 and is given by
Question 4
4 / -1

A block of mass m is connected to another block of mass M by a spring (massless) of spring constant k. The block are kept on a smooth horizontal plane. Initially the blocks are at rest and the spring is unstretched. Then a constant force F starts acting on the block of mass M to pull it. Find the force of the block of mass m.

A

B

C

D

Solution
Question 5
4 / -1

A 10 H.P. motor pumps out water from a well of depth 20 m and fills a water tank of volume 22380 L at a height of 10 m from the ground. The running time of the motor to fill the empty water tank is

A
5 minutes

B
10 minutes

C
15 minutes

D
20 minutes

Solution
Question 6
4 / -1

The moment of inertia of a body about a given axis is 1.2 kg m². Initially, the body is at rest. In order to produce a rotational kinetic energy of 1500 joule, an angular acceleration of 25 radian/sec² must be applied about that axis for a duration of

A
4 seconds

B
2 seconds

C
8 seconds

D
10 seconds

Solution
Question 7
4 / -1

If the earth is treated as a sphere of radius R and mass M; its angular momentum about the axis of its rotation with period T, is

A

B

C

D

Solution
Question 8
4 / -1

The upper end of a wire of diameter 12mm and length 1m is clamped and its other end is twisted through an angle of 30°. The angle of shear is

A
18°

B
0.18°

C
36°

D
0.36°

Solution
Question 9
4 / -1

Let T1 be surface tension between solid and air, T₂ be the surface tension between solid and liquid and T be the surface tension between liquid and air. Then in equilibrium, for a drop of liquid on a clean glass plate, the correct relation is (θ is angle of contact)

A

B

C

D

Solution
Question 10
4 / -1

Two spheres of different materials one with double the radius and one-fourth wall thickness of the other are filled with ice. If the time taken for complete melting of ice in the larger sphere is 25 minute and for smaller one is 16 minute, the ratio of thermal conductivities of the materials of larger spheres to that of smaller sphere is

A
4 : 5

B
5 : 4

C
25 : 8

D
8 : 25

Solution

Radius of small sphere =r

Thickness of small sphere =t

Radius of bigger sphere =2r

Thickness of bigger sphere =t/4

Let K₁ and K₂ be the thermal conductivities of larger and smaller sphere.

For bigger sphere,