Physics Test

Result

Physics Test - 27

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Weekly Quiz Competition

Question 1
1 / -0

Two capacitors C1 and C2 are charged to 120 V and 200 V respectively. It is found that by connecting them together the potential on each one can be made zero. Then :

A

5c1 = 3c2

B

3c1 + 5c2 = 0

C

9c1 = 4c2

D

3c1 = 5c2
Question 2
1 / -0

A charge Q is uniformly distributed over a long rod AB of length L as shown in the figure. The electric potential at the point O lying at a distance L from the end A is:

A

Option 3

B

Option 2

C

Option 4

D

Option 1
Question 3
1 / -0

This question has Statement I and Statement II. Of the four choices given after the Statements, choose the one that best describes the two Statements. Statement – I : A point particle of mass m moving with speed v collides with stationary point particle of mass M. If the maximum energy loss possible is given as f(1/2 mv^2) then f =[m/(M + m)]Statement – II : Maximum energy loss occurs when the particles get stuck together as a result of the collision.

A

Statement – I is true, Statement – II is true, Statement – II is a correct explanation of Statement – I

B

Statement – I is false, Statement – II is true

C

Statement – I is true, Statement – II is false.

D

Statement – I is true, Statement – II is true, Statement – II is not a correct explanation of Statement – I.
Question 4
1 / -0

A

Option 3

B

Option 2

C

Option 4

D

Option 1
Question 5
1 / -0

In Young's double slit experiment, one of the slit is wider than other, so that the amplitude of the light from one slit is double of that from other slit. If Im be the maximum intensity, the resultant intensity I when they interfere at phase difference φ is given by

A

Im/3 [1 + 2cos^2 (φ/2)]

B

Im/5 [1 + 4cos^2 (φ/2)]

C

Im/9 [1 + 8cos^2 (φ/2)]

D

Im/9 [4 + 5cos^2 φ]
Question 6
1 / -0

A boy can throw a stone up to a maximum height of 10 m. The maximum horizontal distance that the boy can throw the same stone up to will be

A

20 m

B

10√2 m

C

10 m

D

20√2 m
Question 7
1 / -0

A charge Q is uniformly distributed over the surface of non conducting disc of radius R. The disc rotates about an axis perpendicular to its plane and passing through its centre with an angular velocity ω. As a result of this rotation a magnetic field of induction B is obtained at the centre of the disc. If we keep both the amount of charge placed on the disc and its angular velocity to be constant and vary the radius of the disc then the variation of the magnetic induction at the centre of the disc will be represented by the figure

A

Option 1

B

Option 2

C

Option 3

D

None of these
Question 8
1 / -0

Two charges, each equal to q, are kept at x = −a and x = a on the x-axis. A particle of mass m and charge q0 = q/2 is placed at the origin. If charge q0 is given a small displacement (y a) along the y-axis, the net force acting on the particle is proportional to:

A

- 1/y

B

1/y

C

y

D

- y
Question 9
1 / -0

If a piece of metal is heated to temperature θ and then allowed to cool in a room which is at temperature θ0 the graph between the temperature T of the metal and time t will be closest to :

A

Option 2

B

Option 3

C

Option 4

D

Option 1
Question 10
1 / -0

A Carnot engine, whose efficiency is 40%, takes in heat from a source maintained at a temperature of 500 K It is desired to have an engine of efficiency 60%. Then, the intake temperature for the same exhaust (sink) temperature must be

A

600 K

B

1200 K

C

750 K

D

efficiency of Carnot engine cannot be made larger than 50%