Question # 1

A body moves a distance of 10 m among a straight line under the action of a force of 5 N. If the work done is 25 J, the angle which the force makes with the direction of motion of a body is:

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0°

30°

60°

90°

Substances that do not flow easily have

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large coefficient of viscosity

small coefficient of viscosity

either of them

none of them

Neutrons are

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positive charge

negatively charged

massless

neutral

The alternative voltage of current is actually measured by:

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Its RMS value

Square root of its mean square value

Instantaneous value

Peak value

Both (A) and (B)

Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called

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deuterium

protium

tritium

none of these

The charge carriers in gases are

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electrons

ions

protons

ions and electrons

1 J = ________?

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10⁷erges

10^-7erges

10⁵erges

10^-5erges

Battery is charged in motor cars, which is based on

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Chemical effect

Magnetic effect

Electric effect

None

Every crystalline solid has

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definite melting point

different melting points

may or may not be definite

none of them

The short distance between two points direction from its initial point to final point is called:

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Velocity

Displacement

Speed

Distance

Free electrons are

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tightly bound

fixed

loosely bound

tightly fixed

When a force of 0.5 N displaces a body through a distance of 2m in the direction of force, the work done is:

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0.5 J

2 J

0.25 J

1 J

The curve representing an isothermal process is called

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adiabat

isotherm

fixed temperature

none of them

A vector of magnitude 5 N is added to a vector of magnitude 8 N while the orientations are changeable. Range of their possible sum will be very from:

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Zero to 3 N

1 N to 13 N

13 N to 3 N

None of these

Fluid friction is _____ the friction between two solid surfaces:

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Greater than

Smaller than

Equal to

None of these

When body moves with increasing acceleration, its velocity time graph is a

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straight line

horizontal straight line

vertical straight line

curve

What will be the ratio of the distance moved by a freely falling body from rest in 4th and 5th seconds of journey?

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4 : 5

7 : 9

16 : 25

1 : 1

The rate at which the free electrons pass through any section of a metallic wire from right to left is:

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Greater than the speed at which they pass from left to right

Less than the speed at which they pass from left to right

The same speed at which they pass from left to right

Any of above

None of them

Watt x second is unit of:

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Force

Work

Power

None of these

The velocity of sound is greatest in

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Water

Air

Vacuum

Metal

If a simple pendulum is shifted from karachi to K-2 cliff, its time period

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remains the same

decreases

increases

none of them

The rate of decay of radioactive substance

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is constant

decrease exponentially with time

varies inversely as time

decreases linearly with time

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

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Maximum

Minimum

Zero

Unity

The temperature of gas is produced by

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At potential energy of its molecules

The kinetic energy of its molecules

The attractive force between its molecules

The repulsive force between its molecules

Gauss(G) is smaller unit of magnetic induction which is related to tesla(T) as

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IT = 10^-4G

IT = 10⁵G

IT = 10³G

IT = 10⁴G

The magnetic field inside a solenoid can be increased by:

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Increasing n

Decreasing I

Increasing I

By using iron core within solenoid

All correct except (B)

Tick the series which lies in the visible region:

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Lyman series

Balmer series

Paschen series

Brackett series

P fund series

The materials in which valence electrons are bound very tightly to their atoms and are not free, are known as

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conductors

insulators

semi-conductors

all of them

An A.C varies as a function of

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Current

Voltage

Time

Charge

A dimension stands for the ___________ nature of certain physical quantity.

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super

Quantitative

Qualitative

Both B and C

The root mean square voltage for alternating current is

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All of these

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