Question # 1

Gaussian surface is always:

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Rectangular

Spherical

Cylindrical

Box shape

Any of these

The body oscillates due to _____ accelerates and overshoots the rest position due to______,:

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Applied force, inertial

Restoring force, friction

Frictional force, inertial

Restoring force, inertial

Light has:

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Wave nature

Particle nature

Dual nature

None of these

Work done along a closed path in a gravitational field is:

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Maximum

Minimum

Zero

Unity

Velocity is a

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scalar quantity

vector quantity

constant quantity

none of them

Acceleration in a body is always produced in the directin of:

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Velocity

Weight

Force

Botha B and C

Centripetal acceleration is also called _______ acceleration:

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Tangential

Radial

Angular

None of them

Number of supplementary units are

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Three

Two

Seven

Five

The work done in moving a body between two points in a conservation field is independent of the:

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Direction

Force applied

Path followed by the body

Power

Which quantity is important in stating the entropy of the system

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initial entropy

final entropy

change in entropy

none of them

Back emf is produced due to

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Self induction

Mutual induction

A.C

Lenz's law

One joule is equal to

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1.6 x 10¹⁹eV

6.25 x 10¹⁸eV

1.6 x 18¹⁸eV

6.25 x 10¹⁹eV

Which one of the following waves belongs to electromagnetic spectrum

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Radio and TV waves

Radar waves

Micro waves

All of them

When a water droplet falling freely through air, the drag force on water droplet increases with th

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decrease in speed

increase in speed

pressure

none of them

When a body is vibrating, the displacement from mean position

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Increases with time

Decreases with time

Changes with time

None of these

From the theory of relativity, momentum p of the photon is related to energy as

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p = hfc

p = hf/c

p = f(hc,f)

p = cf/h

The free electrons in metals:

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Are in random motion and their speed depends upon temperature

Move in particular direction

Move with speed of light

Move such that their speed does not depend on their temperature

None of these

A uniform resistance wire of Length L and diameter d has a resistance R. Another wire of same material has length, 4L and diameter 2d, the resistance will be

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2 R

R

R/2

R/4

Two projectiles are fired from the same point with the same speed at angles of projection 60° and 30° respectively. Which one of the following is true?

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Their range will be same

Their maximum height will be same

Their landing velocity will be same

Their time of flight will be same

The un-steady streamline flow is called

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laminar flow

turbulent flow

both of them

none of them

The general theory of relativity treats problems involving

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inertial frame of references

accelerating frame of references

both of these

none of these

In the study of thermodynamics, which gas is considered as the working substance

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real gas

ideal gas

any gas may be ideal or real

none of them

Electric generators which convert mechanical energy into

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solar energy

thermal energy

kinetic energy

electrical energy

There is present in paraffin a large amount of:

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Nitrogen

Hydrogen

Carbon

Baryllium

Lithium

In Pakistan electricity is supplied for domestic use at 220 V, it is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in Pakistan is R, the resistance of a 60 W bulb for use in USA will be

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2 R

R/4

R/2

R

Second's pendulum is the pendulum whose time period is:

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1 second

2 second

3 second

None of these

It is impossible to devise a processes which may convert heat, extracted from a single reservoir, entirely into work without leaving any change in the working system. This is the statement of

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Clausius statement of second law

Kelvin'sstatement of second law

Clausius statement of first law

Kelvin's statement of first law

When a constant potential difference is applied across the conductor, the drift velocity of electrons:

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Increases

Decreases

Remains the constant

Either of these

None of these

The unit of magnetic flux is

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Weber-m²

Weber-m³

Henry

Weber

During the whole carnot cycle

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Thermal equilibrium is maintained

mechanical equilibrium is maintained

both the thermal and mechanical equilibriumis maintained

both the thermal and mechanical equilibrium is not maintained

If the length of a simple pendulum is 0.25 m its time period would be

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1.0 s

2.0 s

3.0 s

4.0 s

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