Physics Test 172

Result

Physics Test 172

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Weekly Quiz Competition

Question 1
4 / -1

A steel ball of mass 5g is thrown downward with velocity 10 m/s from height 19.5 m. It penetrates sand by 50 cm. The change in mechanical energy will be (g = 10 m/s²)

A
1J

B
1.25 J

C
1.5 J

D
1.75 J

Solution
Question 2
4 / -1

A hollow smooth uniform sphere A of mass m rolls without sliding on a smooth horizontal surface. It collides head on elastically with another stationary smooth solid sphere B of the same mass m and same radius. The ratio of kinetic energy of B to that of A just after the collision is

A
1 : 1

B
2 : 3

C
3 : 2

D
None of these

Solution

After collision velocity of COM of A becomes zero and that of B becomes equal to initial velocity of COM of A. But angular velocity of A remains unchanged as the two spheres are smooth.
Question 3
4 / -1

A satellite revolves around the earth of radius R in a circular orbit of radius 3R. The percentage increase in energy required to lift it to an orbit of radius 5R is

A
10 %

B
20 %

C
30 %

D
40 %
Question 4
4 / -1

Select the correct statement(s) from the following.

I. Modulus of rigidity for a liquid is zero

II. Young's modulus of a material decreases with rise in temperature

III. Poisson's ratio is unitless

A
I only

B
II only

C
I and II

D
I, II and III
Question 5
4 / -1

Two liquids of densities d₁ and d₂ are flowing in identical capillary tubes under the same pressure difference. If t₁ and t₂ are time taken for the flow of equal quantities (mass) of liquids, then the ratio of coefficient of viscosity of liquids must be

A

B

C

D
Question 6
4 / -1

One end of a thermally insulated rod is kept at a temperature T₁ and the other at T₂. The rod is composed of two sections of length l1 and l2 and thermal conductivities K₁ and K₂ respectively. The temperature at the interface of the two sections is

A

B

C

D

Solution

Let T be the temperature of the interface. As the two sections are in series, the rate of flow of heat in them will be equal.
Question 7
4 / -1

1 gm of water at a pressure of Pa is converted into steam without any change of temperature. The volume of 1 g of steam is 1671 cc and the latent heat of evaporation is 540 cal. The change in internal energy due to evaporation of 1 gm of water is

A
≈167 cal

B
500 cal

C
540 cal

D
581 cal

Solution
Question 8
4 / -1

A sample of an ideal gas occupies a volume V at a pressure P and absolute temperature T. The mass of each molecule is m. The equation for density is

A
m k T

B
P/k T

C
P/(k T V)

D
P m/k T

Solution
Question 9
4 / -1

For a simple pendulum, a graph is plotted between its kinetic energy (KE) and potential energy (PE) against its displacement d. Which one of the following represents these correctly? (graphs are schematic and not drawn to scale)

A

B

C

D

Solution
Question 10
4 / -1

The vibrations of a string of length 60 cm fixed at both the ends are represented by the equationwhere x and y are in cm. The maximum number of loops that can be formed in it is

A
4

B
16

C
5

D
15

Solution