Question # 1

Ohm's law states that

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The current through a resistor is directly proportional to the applied voltage

The voltage across a resistor is directly proportional to the current passing through it

Resistance is the constant of proportionality between the voltage and current

all of these

The force applied on unit area to produce any change in the shape, volume or length of a body is known as

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strain

elasticity

stretching

stress

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

Good absorbers of heat are

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Poor emitters

Non emitters

Good emitters

Highly polarized

If the acceleration of a body is negative, then slope of the velocity-time graph will be:

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Zero

Positive

Negative

Infinity

The pressure will change in the pipe, as the fluid moves through that pipe of varying

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cross-section

height

none of them

both of them

Hold the solenoid in the right hand with fingers curling in the direction of current. The direction of the field will be given by:

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Thumb

Curled fingers

Middle finger

Arm of right hand

None of these

It is customary represent a current flowing towards the reader by a symbol

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(x)

(+)

(.)

(-)

(÷)

Formula for calculating moment of inertia of the bodies of one pair is same. Tick the answer.

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Disc, sphere

sphere, hoop

Thin rod, hoop

Hoop,disc

The maximum possible error in the reading for a meter rod with least count 1 mm is:

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0.005 mm

0.05mm

0.5mm

5.0mm

If a car rest acceleration uniformly to a speed of 144 km/h in 20 s it covers a distance of

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20 m

400 m

1440 m

2880 m

Hails fall faster than rain drops due to their

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Greater size

Greater mass

Greater area

None of these

Angle subtended by any side of the eight-sided mirror at the center is

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π/8

π/4

2π/8

2π/4

A constant volume gas thermometer is more sensitive than liquid thermometer because

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Gas expand more than liquid

Gases are easily obtained

Gases are much lighter

Gases do not easily change their state

Two wires of same material have lengths L and 2L and cross-sectional area 4A and A respectively. the ratio of their specific resistance would be:

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1: 1

1: 8

8: 1

1: 2

The isothermal and adiabatic processes are employed in order

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Two isotherm and then two adiabates

Only isothermal one adibate

Only isothermal process

Only adiabatic process

The horizontal velocity component in projectile motion is

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Zero

Constant

Maximum

None of these

The correct unit of Kinematic viscosity in SI system is

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ra(D) s^-2

m².s^-1

g.s^-2

N .sm^-2

Iron, cobalt and nickle are examples of

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

The angular speed of a flywheel making 120 revolutions/minute is:

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π rad/s

2π rad/s

4π rad/s

6π rad/s

In YDS experiment, condition for constructive interference is that path difference is equal to

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nλ

mλ

(n + 1/2)λ

(m + 1/2)λ

Two wave of intensities I an 4I superpose then the maximum and minimum intensities are

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5I and 3I

9I and I

9I and 3I

5I and I

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