Physics Test

Question 1
3 / -1

Three identical spheres, each of mass $1 k g$ , are kept as shown in the figure below, touching each other with their centres on a straight line. If their centres are marked respectively as $P, Q$ and $R$ , then the distance of the centre of mass of the system from $P$ is:

A
$\frac{P Q + P R + Q R}{3}$

B
$P Q$

C
$\frac{P Q + Q R}{3}$

D
$\frac{P R + Q R}{2}$

Question 2
3 / -1

A Carnot engine works like a refrigerator between $250 K$ and $300 K$ . If it receives $750$ calories of heat from the reservoir at the lower temperature, then the amount of heat rejected at the higher temperature is:

A
$900 c a l$

B
$625 c a l$

C
$750 c a l$

D
$1000 c a l$

Question 3
3 / -1

We wish to see inside an atom. Assume the atom to have a diameter of $100 p m$ . This means that one must be able to resolve a width of say $10 p m$ . If an electron microscope is used, the energy required should be:

A
$1.5 k e V$

B
$15 k e V$

C
$150 k e V$

D
$1500 k e V$

Question 4
3 / -1

A magnet of length $10 c m$ and magnetic moment $1 A m^{2}$ is placed along with the side $A B$ of an equilateral triangle $A B C$ . If the length of side $A B$ is $10 c m$ , then the magnetic field at point $C$ is:

A
$10^{- 9} T$

B
$10^{- 7} T$

C
$10^{- 5} T$

D
$10^{- 4} T$

Question 5
3 / -1

A uniform meter scale of length $1 m$ is balanced on a fixed semi-circular cylinder of radius $30 c m$ as shown in the figure. One end of the scale is slightly depressed and released. The time period (in seconds) of the resulting simple harmonic motion is

(Take $g = 10 m s^{- 2}$ )

A
$π$

B
$\frac{π}{2}$

C
$\frac{π}{3}$

D
$\frac{π}{4}$

Question 6
3 / -1

Directions: From the statements of Assertion and Reason mark the correct answer from the options.

(a) If both assertion and reason are true, and the reason is the correct explanation of assertion.

(b) If both assertion and reason are true, but the reason is not the correct explanation of assertion.

(c) If the assertion is true, but the reason is false.

(d) If both assertion and reason are false.

Assertion: Diamagnetic materials can exhibit magnetism.

Reason: Diamagnetic materials have a permanent magnetic dipole moment.

A
(a)

B
(b)

C
(c)

D
(d)

Question 7
3 / -1

The threshold frequency for a metallic surface corresponds to an energy of $6.2 e V$ and the stopping potential for a radiation incident on this surface is $5 V$ . The incident radiation lies in:

A
ultraviolet region

B
infrared region

C
visible region

D
$X$ -ray region

Question 8
3 / -1

The bob of a simple pendulum is a spherical hollow ball filled with water. A plugged hole near the bottom of the oscillating bob gets suddenly unplugged. During the observation, till water is coming out, the time period of oscillation would:

A
first increase and then decrease to the original value

B
first decrease and then increase to the original value

C
remain unchanged

D
increase towards a saturation value

Question 9
3 / -1

An electric motor is a device which transforms-

A
Mechanical energy into Electrical energy

B
Electrical energy into Mechanical energy

C
Kinetic energy into Potential energy

D
Electrical energy into Potential energy

Question 10
3 / -1

A bar magnet of magnetic moment $2.0 J T^{- 1}$ lies aligned with the direction of a uniform magnetic field of $0.25 T$ . What is the work done to turn the magnet so as to align its magnetic moment opposite to the field direction?

A
$0.25 J$

B
$0.5 J$

C
$0.75 J$

D
$1.0 J$

Submit Test

Physics Test - ...

Question 1

PQ+PR+QR3

PQ

PQ+QR3

PR+QR2

Question 2

900cal

625cal

750cal

1000cal

Question 3

1.5keV

15keV

150keV

1500keV

Question 4

10-9T

10-7T

10-5T

10-4T

Question 5

π

π2

π3

π4

Question 6

(a)

(b)

(c)

(d)

Question 7

ultraviolet region

infrared region

visible region

X-ray region

Question 8

first increase and then decrease to the original value

first decrease and then increase to the original value

remain unchanged

increase towards a saturation value

Question 9

Mechanical energy into Electrical energy

Electrical energy into Mechanical energy

Kinetic energy into Potential energy

Electrical energy into Potential energy

Question 10

0.25J

0.5J

0.75J

1.0J

User

Question Analysis

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$\frac{P Q + P R + Q R}{3}$

$P Q$

$\frac{P Q + Q R}{3}$

$\frac{P R + Q R}{2}$

$900 c a l$

$625 c a l$

$750 c a l$

$1000 c a l$

$1.5 k e V$

$15 k e V$

$150 k e V$

$1500 k e V$

$10^{- 9} T$

$10^{- 7} T$

$10^{- 5} T$

$10^{- 4} T$

$π$

$\frac{π}{2}$

$\frac{π}{3}$

$\frac{π}{4}$

$X$ -ray region

$0.25 J$

$0.5 J$

$0.75 J$

$1.0 J$