Question # 1

The dimensional formula for the modulus of elasticity is same as that for.

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Stress

Strain

Velocity

Surface tension

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Both an ammeter and voltmeter should have small resistance

Both an ammeter and a voltmeter should have large resistance

An ammeter should have large resistance and a voltmeter should have small resistance

An ammeter should have small resistance and a voltmeter should have large resistance

As the electron in Bohr orbit of hydrogen atom passes from stat n = 2 to n = 1 the kinetic energy K and potential energy U change as

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K two-fold,U also two-fold

K four-fold,U also four-fold

K four-fold,U two-fold

A train of 150 m length is going towards north direction at a speed of 10 ms^-1 A parrot flies at a speed of 5 ms^-1 towards south direction parallel to the railway track,The time taken by the parrot to cross the train is equal to

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12 s

8 s

15 s

10 s

According to the Hooke's law the force required to change the length of a wire by '1' is proportional to

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1^-2

1^-1

1

1²

The unit of inductance is equivalent to

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V x s/A

V x A/s

A x s/v

V/A x s

At constant volume temperature is increased then

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Collision on walls will be less

Number of collisions per unit time will increase

Collisions will be in straight lines

Collisions will not change

The magnetic moment of a circular coil carrying current is

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Directly proportional to the length of the wire in the coil

Inversely proportional to the length of the wire in the coil

Directly proportional to the square of the length of the wire in the coil

Inversely proportional to the square of the length of the wire in the coil

A body is dropped from a tower with zero velocity reaches ground in 4s. The height of the tower is about

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80 m

20 m

160 m

40 m

Which of the following sources give discrete emission spectrum?

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Incandescent electric bulb

Sun

Mercury vapour lamp

Candle

A 2 kg body and a 3 kg body have equal momentum if the kinetic energy of 3 kg body is 10 j, the KE of 2 kg body will be

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6.66 j

15 j

22.5 j

45 j

The product of the pressure and volume of an ideal gas is

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A constant

Approximately equal to the universal gas constant

Directly proportional to its temperature

Inversely proportional to its temperature

A particle moves along a circular path under the action of a force. The work done by the force is

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Zero

Positive and non-zero

Negative and non zero

None of the above

When boron is added as an impurity to silicon, the resulting material is.

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n type conductor

n type semiconductor

p-type conductor

p-type semiconductor

Two sources of sound are said to be coherent if

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They produce sounds of equal intensity

They produce sounds of equal frequency

They produce sound waves vibrating with the same phase

They produce sound waves with zero or constant phase different all instant of time

In an A.C. circuit, a resistance of R ohm is connected in series with an inductance L. If phase angle between voltage and current be 45°, the value of inductive reactance will be

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R/4

R/2

R

Cannot be found with the given data

The dot product of two vectors is negative when

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They are parallel vectors

They are anti-parallel vectors

They are perpendicular vectors

None of the above is correct

What remains constant when the earth revolves around the sun?

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Angular momentum

Linear momentum

Angular kinetic energy

Linear kinetic energy

When we apply reverse bias to a junction diode, it

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Lowers the potential barrier

Raise the potential barrier

Increase the majority carrier current

Increase the minority carrier current

To increase the magnification of a telescope

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The objective lens should be of large focal length and eyepiece should be of short focal length

The objective and eyepiece both should be of large focal lengths

Both the objective and eyepiece should be of smaller lengths

The objective should be small focal length and eyepiece should be of large focal length

A photoelectric cell coverts

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Electrical energy to light energy

Light energy to light energy

Light energy to electrical energy

Light energy to elastic energy

A pendulum clock set to give correct time in Karachi is taken to Quetta. It would give correct time if

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The mass of the pendulum is increased

The mass of the pendulum is decreased

The length of the pendulum is increased

The length of the pendulum is decreased

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