Question # 1

If two bodes are under a collision that is not perfectly elastic then.

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K.E. is conserved but momentum is not

Momentum is conserved but K.E. is not

Neither K.E. nor momentum is conserved

Both K.E. and momentum are conserved

Mean life of a radioactive sample is 100 s its half life will be

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0.693 s

1 s

6.93 s

69.3 s

When a charged rod is brought near bits of dry cork dust The dust will.

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Cling firmly to rod

Be replied from the rod

Attract itself to the rod a first and then fly off

Be repelled at first and then be drawn to the rod

Matter waves

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Are electromagnetic in nature

Travel with the speed of light

Can be diffracted

Are longitudinal waves

A heat engine can develop efficiency equal to 100% if the temperature of the sink is

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Less than that of source

Equal to that of source

0 K

0 ^oC

Which of the following describes that the time interval between two events may be different in different of references

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Simullaneously

Time dilation

Length contraction

Mass variation

The energy equivalent of 1 kg of matter a

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10^-15 J

1 J

10¹²J

10¹⁷ J

What is the period of geostationary satellite.

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6 hours

12 hours

18 hours

24 hours

A component of the spectrometer which consists of a fixed metallic tube with a coned lens at one end and an adjustable slit is called.

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Telescope

Collimator

Tumtable

Grating

Which of the following are particle accelerators.

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Cyclotrons

Synchrotrons

Linear accelerators

All of the above

A type of resistor whose resistance varies significantly with temperature is.

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Thermistor

Thermocouple

Strain gauge

Potentiometer

The hyperfine lines in the spectrum relates to

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Stark effect

Zeeman effect

Lande's spliting

Nuclear magnetic spin

Significant motion for the molecules of a monoatomic gas is.

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Rotatory

Vibratory

Translatory

Random

The eight most common element in the universe by mass is

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Ge

C

Si

As

An electrical device is rated at 12 W , 2 A How many 1.5 V batteries are needed in the device.

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2

4

6

8

A ball mass 0.25 kg is thrown to a height of 20 m The change in G.P.E is

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49 J

50 J

-75 J

500 J

Restoring force in the SHM is

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Centripetal

Frictional

Conservative

Non conservative

The mains frequency in Pakistan is

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20 Hz

50 Hz

40 Hz

60 Hz

The unit of time constant RC is.

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Second

second-1

Second -2

Second 2

Efficiency of a Carnot engine can never be 1 or 100% unless cold reservoir is at absolute temperature.

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0 K

100 K

273 K

373 K

The moment of linear momentum is equal to

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Implies

Torque

Angular momentum

Couple

When a conductor situated in a dielectric is charted the energy resides.

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Only on the dielectric

Only on medium surrounding charge

On the dielectric and medium both

Only on the type of the charge

If two non zero vectors are perpendicular to each other then their scalar product is equal to.

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-1

1

0

Infinity

A neutron is in head on elastic collision with a stationary nitrogen nucleus The mass of nitrogen nucleus is 14 times that of a neutron The neutrons velocity after the collision is.

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Less in magnitude than its intimal velocity

Less in magnitude than the final velocity of the nitrogen atom

Equal in magnitude to its initial velocity but in the opposite direction

Greater in magnitude than its initial velocity

If air is replaced by any other dielectric medium, the force between two charges.

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Decreases

Increases

Remain the same

Becomes infinity

The SI unit of modulus of elasticity us

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N m-2

N m-1

N m

N m -3

The resolving power of an instrument increases as the wavelength of light used decreases, the magnifying power will

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Remain the same

Increases

Decreases

Have no relation between the two

A magnetic pole

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Is made of a magnetic material

Is a factious quantity

Is defined in terms of Ampere's law

Cannot be detected

During transition, atom cannot emit

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Visible light

Ultraviolet radiation

Infrared radiations

gama rays

One volt is equal to.

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One joule per coulomb

One dyne per coulomb

One newton per coulomb

One watt second

A negative acceleration does not necessaryimply.

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Decreasing speed

An increasing distance

An increasing speed

A decreasing distance

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