Question # 1

When a platinum wire is heated of 1600^oC, it becomes

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orange

Cherry red

Dull red

White

The emission of electrons from a metal surface when exposed to light of suitable frequency is called.

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Pair production

Compton effect

Photo electric effect

Zeeman effect

To produce beats it is necessary to use two waves.

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Travelling in opposite direction

Of slightly different frequencies

Of equal wavelengths

Of equal amplitudes

In a parallel resonant circuit, at resonance

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Current is maximum

Voltage is maximum

Impedance is minimum

Impedance is zero

If a planet of mass double than that of the earth and radius three times greater than the earth a 10 kg mass on its surface will weight.

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2.2 N

4.4 N

6.7 N

13.2 N

If a fluid does not wet a liquid surface, the angle of contact is.

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90^o

less than 90 ^o

* greater than 180 ^o

between 90^o and 180 ^o

The heat accepted and rejected by a Carnot engine operating between two heat reservoirs defines.

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The efficiency of the working substance of the engine

the ideal gas scale of temperature

The ratio of the absolute temperature of the reservoirs

The thermal capacity of the working substance

A liquid surface tend to contract this phenomenon is due to

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Viscosity

Diffusion

Density

surface tension

Current per unit area is called.

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Electric potential

Current density

Charge density

Electric intensity

Davision and Germer got Nobel prize for their work on

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The dual nature of particles

The wave nature of particles

The corpuscular nature of particles

All of the above

The first super conductor was discovered by

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Faraday

Lenz

Kamaerlingh Ornes

Oersted

Which is the heat transfer mode between an object and its environment due to circular fluid motion.

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Conduction

Convection

Radiation

Mass transfer

If the wavelength of a wave is 1 cm and its period is 0.02 s , velocity of the wave will be

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20 cm s-1

50 m s-1

60 cm s-1

100 cm s-1

a 2,000 kg heavy truck travelling at 36 km h-1 strikes a tree and comes to a stope in 0.1 s The average force on the truck during the crash is.

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2 x 10² N

2 X 10³N

2 X 10⁴ N

2 X 10³ N

Which of the following factor will not affect the speed of sound i a medium.

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Temperature

Pressure

Humidity

Mass

What is true is real images formed by a converging lens.

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they are inverted

They are on the same side of the lens as the object

They can never be shown on a screen

They cannot be seen

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

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small

Large

Moderate

Unmeasurable

Angular moment is conserved due to

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Variable force

Constant force

Central force

Uniform force

If a resistance is connected in parallel with a galvanometer the resulting instrument is called.

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A voltmeter

An ammeter

A wattmeter

A potentiometer

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

Current in an electrolyte is carried by.

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Electron only

Anions only

Citations only

Mesons only

Who described an ideal heat engine in 1840

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Boyle

Saadi Carnot

Kelvin

Currie

The SI unit of magnetic flux is

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gauss

Maxwell

Oersted

Water

The cause of ferromagnetism is.

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Orbital motion of elections

spin Motion of electrons

Permanent dipole memento

Spin angular momentum

The binary equivalent of 25 is

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111001

11001

1001

10101

Reciprocal of the focal length is called.

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Radios of curvature of the lens

Power of the lens

Aperture of the lens

Resolving power

The rate of change of momentum of a body falling under gravity is equal to its.

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P.E.

K.E

Weight

Density

When a body acceleatres.

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Its direction always chances

It mass always changes

It velocity always changes

It falls towards the earth

The actual gas can behave like an ideal gas at

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Low density and high pressure

High density and high pressure

Low density and low pressure

High density and low pressure

Which of the following is not true.

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Velocity can be nagative

Velocity is a scalar

Speed is a vector

Speed can be negative

Mean free path of gas molecules is inversely proportional to its

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Volume

Pressure

Temperature

Size

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