Question # 1

Two forces of 10N and 15N are acting simultaneously on an object in the same direction. Their resultant is

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Zero

5N

25N

150N

A particle is moving in a uniform magnetic field then

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Its momentum changes but total energy remains the same

Both momentum and total energy remains the same

Both changes

Total energy change but momentum remains

A wire is stretched to double of its length.The strain is

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2

1

Zero

0.5

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 os increased

The length of the pendulum is decreased

The sum of the magnitude of two forces acting at a point is 18 and the magnitude of their resultant is 12. If the resultant is at 90° with the force of the smaller magnitude then their magnitude are:

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3, 15

4, 14

5, 13

6, 12

According to Stoke's law drag force depends on

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Initial velocity

Final velocity

Terminal velocity

Instantaneous velocity

To explain his theory Bohr used

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Conservation of linear momentum

Conservation of angular momentum

Conservation of quantum frequency

Conservation of energy

In a simple harmonic motion (SHM) which of the following does not hold?

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The force on the particle is maximum at the ends

The acceleration is minimum at the mean position

The potential energy is maximum at the mean position

The kinetic energy is maximum at the mean position.

A sun rise or sun set, the sun looks reddish because.

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The sun is coldest at these times

Of the effects of reflection and refraction

The sun is hottest at these times

Of the scattering of light

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

A ten-ohm electric heater operates on a 110 V line Calculate the rate at which it develops heat in watts:

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1310 W

670 W

810 W

1210 W

A 50-volt battery is connected across 10-ohm resistor. The current is 4.5 A. The internal resistance of the battery is

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Zero

0.5 ohm

1.1 ohm

5.0 ohm

If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in the form of heat will be

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0.1 watt

1 watt

10 watt

100 watt

The mass defect for the nucleus of helium is 0.0303 a.m.u. What is the binding energy per nucleon for helium in MeV?

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28

7

4

1

Centre of mass is a point

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Which is geometric centre of a body

From which distance of particles are same

Where the whole mass of the body is supposed to be centered

Which is the origin of reference frame

The time period of a simple pendulum is 2 seconds. If its length is increased by 4 times, then its period becomes

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16 s

12 s

8 s

4 s

Which of the following is the only vector quantity?

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Temperature

Energy

Power

Momentum

A person standing on a rotating platform has his hands lowered. He suddenly outstretches his arms. The angular momentum

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Becomes zero

Increases

Decreases

Remains the same

Two forces are acting together on an object. The magnitude of their resultant is minimum when the angle between the force is

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0°

60°

120°

180°

Which of the modulus of elasticity is involved in compression a rod to decrease its length?

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Young's modulus

Bulk modulus

Modulus of rigidity

None of the above

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

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Stress

Strain

Velocity

Surface tension

Two electric bulbs of 200 W and 100 W have same voltage. If R₁and R₂be their resistance respectively then

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R₁=2R₂

R₂=2R₁

R₂=4R₁

R₁=4R₂

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