Question # 1

Which statement for geostationary orbit is false.

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A geostationary orbit must be directly above the equator

All satellites in a geostationary orbit must have the same mass

The period of a geostationary orbit must be 24 hours

There is only one possible radius for geostationary orbit

The process where by energy is dissipated from the oscillating system is called.

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Resonance

Damping

Forced oscillation

Free oscillation

The consumption of energy by a 60 W bulb in 2 s is

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0.02 J

30 J

60 J

120 J

The change in wavelength of an X-ray when scattered from an electron is called.

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Compton shift

Doppler shift

Stefan's law

Fraunhofer lines

In water drops rainbows are formed by

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Reflection

Refraction

Dispersion

All of these

A junction between P-Type and n-type materials is called.

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Ampilifier

Transistor

Rectifier

Diode

At low frequency the value of resistance of certain capacitors is.

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small

Large

Moderate

Unmeasurable

The ration Cv/Cp = y for a diatomic gas like air is

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1.29

1.30

1.40

1.67

In a stationary wave the particle velocity at the node is

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Zero

Constant

Minimum

Maximum

A factory buy 100 g of a radioactive chemical with a half life of 5 years which decays to a stable compound How much of the chemical will still be radioactive 10 years time.

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25 g

50 g

75 g

100 g

Good acoustic implies

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Obtaining as much reverberations as possible

Making the reverberation as small as possible

Obtaining the optimum of reverberations

Eliminating reverberations

If a body is moving with constant velocity then

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Its acceleration is zero

Its direction may be changing

Its speed may be changing

Its acceleration is constant

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

Short sightedness in the eye occurs due to the.

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Contraction of eyeball

Increases in focal length of eye lens

Reduction in focal length of eye lens

Reduction in distance between retina and eye lens

What is the type of corrective lens used to correct or enhance the vision is only one eye.

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Axicon

Monocle

Zoom lens

Camera lens

Diffraction is a special type of.

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Polarization

Interference

Dispersion

Scattering

The product of mass and specific heat of a substance is called.

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Latent heat

Water equivalent

Atomic heat

Heat capacity

A mason of 9.8 N weight is climbing on a 20 m high ladder The P.E. of mason at the middle of the ladder is.

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98 J

196 J

960 .4 J

1920 .8 J

With the increase of temperature, teh pitch of an organ pipe

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Increase

Descrease

Remain the same

May increase or decrease

One rem is equal to.

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0.1 Sv

0.01 Sv

0.001 Sv

0.0001 SV

Half life of a radioactive elements 10 minutes If the initial cont. rate is 368 counts per minute for what time count rate reaches 32 counts per minute.

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20 minutes

40 minutes

80 minutes

120 minutes

Which thermometer is called sprint thermometer

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Alcohol thermometer

Mercury in glass thermometer

Gas thermometer

Radiation thermometer

The blooming of the image due to dispersion in lenses is called.

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spherical aberration

Chromatic aberration

Astigmation

Curvature of image field

When did an international committee agree on a set of definition of units.

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1912

1956

1960

1986

Electromagnetic waves are produced by

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Charge at rest

Accelerated changes

Heating a conductor

Electroplating

Beats occur due to

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Reflection

Refraction

interference

Diffraction

The steady current which produces the same heating effect in a resistance in a given time as the alternating current does in the same resistance in the same time is called.

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Induced current

Root mean square value of an alternating current

Mean value of alternating current

Electromotive force

The phase velocity is the velocity of a point that moves with a wave at constant phase it is also called.

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Phase speed

Wave speed

Wave velocity

All of these

The maximum energy of emitted photoelectron is measured by

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the largest potential difference they can traverse

The current they produce

The potential difference they produce

The speed with they emerge

In a resistor, when base width decreases with increasing Vbc, this phenomenon is called.

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Tunneling

Thermal runway

Pinch off

Early effect

The acceleration due to gravity

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Has the same value everywhere in space

Has the same value every where on the earth

varix with altitude on the earth

Is great her on the moon owing to its smaller diameter

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