Question # 1

The most suitable material for permanent magnet is

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cobalt

iron

steel

alaminium

Which of the following does not obey ohm's law?

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Copper

Al

Diode

None

Ferromagnetic substances lose their magnetism when heated above a certain temperature, known as

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critical temperature

curie temperature

high temperature

fixed temperature

When the velocity of a liquid flowing steadily in a tube increases, its pressure?

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Decreases

Increases

Remains same

Zero

The passage of current is accompanied by a magnetic field in the surrounding space:

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Always accompanied

Sometimes accompanied

Never accompanied

Any of above

None of these

By convention, torques producing clockwise rotation are taken as:

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Positive

Nagative

Zero

None of these

The results of spectra obtained by Balmer were expressed in 1896 by:

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Bohr

Rydberg

Planck

Rutherford

Coulomb

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

Brownian motion increases due to

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Increase in size of Brownian particle

Increase in temperature of medium

Increase in density of medium

Increase in viscosity of medium

Step up transformer has a transformation ratio of 3:2. What is the voltage in secondary, if voltage in primary is 30V:

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45 V

15 V

90 V

300 V

Resistor is a device which convert electric energy to

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Heat energy

Chemical energy

Elastic energy

All of the above

Rectangular components are those which are

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Right angle to each other

Making angle of 90^O with each other

Perpendicular to each other

All of these

In young's slit experiment on interference the ratio of the intensities of a bright band and a dark band is 6 : 1 the ratio of the amplitudes o the interfering waves is

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16

5/3

4

1/4

The correct unit of electric current in SI system is

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Ampere

Ampere/sec

Coulomb sec

Coulomb / meter

How many fringes will pass a reference point if the moveable mirror of a Michelson s interferometer is moved 0.06 mm The wavelength of light used is 5.89 x10^-3 mm

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200

300

20.4

2.3

Conventionally, all the distances p, q, f, are measured from ______ of the lens

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Focus

Optical center

Edges

Centre of curvature

If the velocity of a body becomes double and mass becomes half then its K.E

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Becomes double

Becomes four times

Is halved

Becomes eight times

The original source of Wind energy is

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Tides

Waves

Sun

Moon

According to Bernoulli s theorem velocity and pressure

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Are directly proportional

Are inversely proportional

Have no relation

Are equal

The blood vessels are inflated eve in

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Relaxed states between heart beat

Working state between hear beat

Occasionally

None of these

If one atom or molecule lies out each of the eight corners of a cube, it is called

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Simple cube

Face centered cube

Body centered cube

None of these

If two ping pong balls are suspended near each other and a fast stream of air is produced in the space between the balls, then the balls.

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Come closer

Move farther

Remain in original position

Fall down

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