Question # 1

Center of mass is a point

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Which is geometric center 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 modulus of rigidity of a liquid is

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Zero

1

Infinity

A value not one of those mentioned above

The distance between node and anti-node is

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λ

λ/2

λ/4

2λ

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

In an AC circuit a resistance of R ohm i connected in series with an inductance L if phase angle between voltage and current be 45^o the value of inductive reactance will be

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R/4

R/2

R

A bullet is short from a rifle. As a result the rifle recoils, The kinetic energy of rifle as compared to that of bullet is

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Less

Greater

Equal

Cannot be concluded

The structure of solids is investigated by using

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Cosmic Rays

X-rays

Intra red Radiation

y-rays

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by monochromatic blue light of the same intensity

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Fringe width will decrease

Fringe width will increase

The fringe width will remain unchanged

Fringes will become less intense

Relation between pressure (P) and energy (E) of a gas is

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P = 2/3 E

P = 1/3 E

P = 3/2 E

P = 3 E

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°

Light appears to travel in straight lines since

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It is not absorbed by the atmosphere

It is reflected by the atmosphere

Its wavelength is very small

Its velocity is very large

In which region of electromagnetic spectrum does the Lyman series of hydrogen atom lie

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Ultraviolet

Infrared

Visible

X-ray

The twinkling of stars is due to

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The fact that stars do not emit light continuously

The refractive index of the earth's atmosphere fluctuate

Intermittent absorption of star light by its own atmosphere

None of these

If the metal bob is a simple pendulum is replaced by a wooden bob, then its time period will

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Increas

Decreases

Remain the same

First A then B

A planet is observed by an astronomical refracting telescope having an objective of focal length 16 m and an eyepiece of focal length 2 cm.

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The distance between the objective and the eyepiece is 8 m

The angular magnification of the planet is 200

The image of the planet is inverted

The objective is smaller than the eyepiece

In a voltmeter the conduction takes place due to

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Electrons only

Holes only

Electrons and holes

Electrons and ions

A particle is moving in a uniform magnetic filed, 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

The incorrect statement regarding the lines of force of the magnetic field B is

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Magnetic intensity is a measure of lines of force passing through unit area held normal to it

Magnetic lines of force form a close curve

Inside a magnet, its magnetic lines of force move from north pole of a magnet towards its south pole

Due to a magnet magnetic lines of force never cut each other

For production of beats the two sources must have

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Different frequencies and same amplitude

Different frequencies

Different frequencies, same amplitude and same phase

Different frequencies and same phase

A 2 kg body and a 3 kg body have equal momentum. If the kinetic energy of 3 kg body is 10 J, the KE of 2 kg body will be

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6.66 J

15 J

22.5 J

45 J

The conductivity of a superconductor is

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Infinite

Very large

Very small

Zero

At 0°K which of the following properties of a gas will be zero?

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Kinetic energy

Potential energy

Vibrational energy

Density

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