Question # 1

The open loop gain of OP-AMP is of the order of

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10²

10³

10⁴

10⁵

Which of the following does not exhibit S.H.M?

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a plucked violin string

a mass attached to a spring

a train shunting between two terminals

a simple pendulum

Energy gas behaves like an ideal gast at

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High temperature and low pressure

Low temperature and high pressure

Both A and B

None

The change of order of vectors in a dot product of two vectors:

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Changes its value

Doesn't change it's value

Changes the direction product quantity

None of these

The wave nature of light was proposed by:

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Newton

Thomas Young

Huygen

None of these

The length contraction happens only

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Opposite to the direction of motion

along the direction of motion

perpendicular to the direction of motion

In any direction

Battery is charged in motor cars, which is based on

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Chemical effect

Magnetic effect

Electric effect

None

How much time, theα-particle more massive than an electron

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600

7000

5000

15000

The most suitable material for permanent magnet is

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cobalt

iron

steel

alaminium

The counter, which also provides the power to the G.M. tube is called:

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Thin mica window

thin glass window

Airy window

Wooden window

None of these

Acceleration in a body is always produced in the directin of:

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Velocity

Weight

Force

Botha B and C

The way through which electromagnetic radiations or photons interact with matter depends upon their:

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Wavelength

Frequency

Energy

Temperature

All of these

The waves which propagate out in space due to oscillation of electric and magnetic fields are known as

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e.m. waves

mechanical waves

sound waves

water waves

In a voltmeter the conduction takes place due to

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Electrons only

Holes only

Electrons and holes

Electrons and ions

In the force applied to parallel to the direction of motion, then the work done is:

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Positive

Negative

Zero

None of these

If water rises 4 cm in a long, thin tube because of capillary action, then, under corresponding conditions of use, the rise (in the tube) of a liquid whose density is 2 g/cm²will be

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1 cm

2 cm

8 cm

None

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

If 250V is the RMS value of alternative voltage, then its peak value V_owill be:

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353.5V

250V

175V

zero

400V

Work done along a closed path in a gravitational field is:

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Maximum

Minimum

Zero

Unity

The vertical and horizontal range will be equal id angle of projection is

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76°

45°

60°

120°

The energy of the 4th orbit in hydrogen atom is

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2.5 ev

- 3.5 ev

-0.85 ev

-13.6 ev

In the equation E=mc²value of c is:

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1,86,000 miles per hour

1,86,000 miles per sec

3 X 10⁸m/sec

Both A and C

Both B and C

Static electricity is produced by the transfer of:

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Electrons

Protons

One fluid

Two fluids

None of these

The locus of all the points in the same phase of vibration is called:

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Wave packet

Wave front

Wave number

None of them

If two forces of magnitudes 3.5 and 2.5 N act on a body such that the angle between the forces is zero, then magnitude of the resultant will be:

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1.0 N

6 N

3.5 N

12 N

Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?

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3RΩ

2R/4Ω

R/3Ω

2R/3Ω

When a water droplet falling freely through air, the drag force on water droplet increases with th

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decrease in speed

increase in speed

pressure

none of them

Rate of flow can be expressed in

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litre/sec

litre-sec

sec/litre

sec/litre-m

For maximum linear distance of travel, a projectile must be fired at an angle of

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0°

45°

90°

60°

Consider a spherical shell of metal at he centre of which a positive point charge is kept

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The electric filed is zero outside the shell

The electric field is zero everywhere

The electric field is zero in the region inside the shell

The electric field is non-zero in both regions outside and inside the shell

When a shell explodes in mid-air, its fragments fly off in

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only one direction

in two direction

different directions

a particular direction

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