Physics Test

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Physics Test - 15

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Weekly Quiz Competition

Question 1
1 / -0

During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its temperature. The ratio of Cp/Cv for the gas is

A

5/3

B

3/2

C

2

D

4/3
Question 2
1 / -0

If we study the vibration of a pipe open at both ends, then the following statement is not true

A

Pressure change will be maximum at both ends.

B

All harmonics of the fundamental frequency will be generated.

C

Odd harmonics of the fundamental frequency will be generated.

D

Open end will be anti-node.
Question 3
1 / -0

A wire of resistance 4 Ω is stretched to twice its original length. The resistance of stretched wire would be

A

2 Ω

B

8 Ω

C

4 Ω

D

16 Ω
Question 4
1 / -0

The condition under which a microwave oven heats up a food item containing water molecules most efficiently is

A

Microwaves are heat waves, so always produce heating

B

The frequency of the microwaves has no relation with natural frequency of water molecules

C

The frequency of the microwaves must match the resonant frequency of the water molecules

D

Infra-red waves produce heating in a microwave oven
Question 5
1 / -0

A plano-convex lens fits exactly into a planoconcave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices µ1 and µ2 and R is the radius of curvature of the curved surface of the lenses, then the focal length of the combination is

A

R/(µ1 - µ2 )

B

2R/(µ2 - µ1 )

C

R/2(µ2 - µ1 )

D

R/2(µ2 + µ1 )
Question 6
1 / -0

In Young’s double slit experiment, the slits are 2 mm apart and are illuminated by photons of two wavelengths λ1 = 12000 Å and λ2 = 10000 Å. At what minimum distance from the common central bright fringe on the screen 2 m from the slit will a bright fringe from one interference pattern coincide with a bright fringe from the other?

A

8 mm

B

6 mm

C

4 mm

D

3 mm
Question 7
1 / -0

A

Option A

B

Option B

C

Option D

D

Option C
Question 8
1 / -0

A stone falls freely under gravity. It covers distances h1, h2 and h3 in the first 5 seconds, the next 5 seconds and the next 5 seconds respectively. The relation between h1, h2 and h3 is

A

h2 = 3h1 and h3 = 3h2

B

h1 = h2/3 = h3/5

C

h1 = h2 = h3

D

h1 = 2h2 = 3h3
Question 9
1 / -0

Two pith balls carrying equal charges are suspended from a common point by strings of equal length, the equilibrium separation between them is r. Now the strings are rigidly clamped at half the height. The equilibrium separation between the balls now become

A

2r/3

B

2r/(3)^1/2

C

r/(2)^1/3

D

[1/(2)^1/2]^2
Question 10
1 / -0

A wire, which passes through the hole in a small bead, is bent in the form of quarter of a circle. The wire is fixed vertically on ground as shown in the figure. The bead is released from near the top of the wire and it slides along the wire without friction. As the bead moves from A to B, the force it applies on the wire is

A

radially inwards initially and radially outwards later.

B

radially outwards initially and radially inwards later.

C

always radially inwards.

D

always radially outwards.

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Re-Attempt Weekly Quiz Competition

Physics Test - 15

Result

Physics Test - 15

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Rank

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SHARING IS CARING

Question 1

5/3

3/2

2

4/3

Question 2

Pressure change will be maximum at both ends.

All harmonics of the fundamental frequency will be generated.

Odd harmonics of the fundamental frequency will be generated.

Open end will be anti-node.

Question 3

2 Ω

8 Ω

4 Ω

16 Ω

Question 4

Microwaves are heat waves, so always produce heating

The frequency of the microwaves has no relation with natural frequency of water molecules

The frequency of the microwaves must match the resonant frequency of the water molecules

Infra-red waves produce heating in a microwave oven

Question 5

R/(µ1 - µ2 )

2R/(µ2 - µ1 )

R/2(µ2 - µ1 )

R/2(µ2 + µ1 )

Question 6

8 mm

6 mm

4 mm

3 mm

Question 7

Option A

Option B

Option D

Option C

Question 8

h2 = 3h1 and h3 = 3h2

h1 = h2/3 = h3/5

h1 = h2 = h3

h1 = 2h2 = 3h3

Question 9

2r/3

2r/(3)^1/2

r/(2)^1/3

[1/(2)^1/2]^2

Question 10

radially inwards initially and radially outwards later.

radially outwards initially and radially inwards later.

always radially inwards.

always radially outwards.

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