Question # 1

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

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larger

shorter

equal

none of these

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

In the formula for finding the speed of waves in the spring, unit of m in SIn units is:

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kg

kg-meter

kg/meter

Meter/kg

The fractional change in resistance per kelvin is known as

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temperature coefficient

resistance coefficient

super temperature

critical temperature

A P-N juction or semiconductor diode cannot be used as

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A rectifier

Detector

Oscillator

An amplifier

A dirty carpet is to be cleaned by heating. This is an accordance with____ law of motion:

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First

Second

Third

None of these

To make an LED, it is impreacticable to use:

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Silicon

Gallium arsenide

Gallium arsenide phosphide

Iron

Both (B) and (C)

Electromagnetic waves emitted by hot bodies are called:

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Photoelectrons

Alpha rays

Thermal radiation

None of these

A 100 Kg car is moving at the speed of 10 m/sec and comes to rest after covering a distance of 50 m. The amount of work done against the friction is:

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+5 X 10¹J

+5 X 10²J

+5 X 10³J

+5 X 10⁴J

The interior of a hollow charged metal sphere is a region which:

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Contain some magnitude of electric field

Is full of electric field lines

Is field-free region

Either (A) or (B)

None of these

The net force acting on a 100 kg man standing in an elevator accelerating downward with a = 0.8 m sec^-2comes out to:

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980 N

580 N

1380 N

Zero

A particle moving uniformly along circle its projection along diameter performs

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Linear motion

Projectile motion

SHM

Rotatory motion

The electric field lines start from:

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Positive charge

Negative charge

Either A and B

Neutron

An atom

Resonance occurs when one of the natural frequencies of vibration of the forced or driven harmonic oscillator

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greater than the frequency of applied force

equal to the frequency of applied force

less than the frequency of applied force

all of them

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

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Decreases

Increases

Remains same

Zero

In and A.C. circuit, the current lags behind the emf. The power factor is 50% In order to make it 100%, What additional component is to be used?

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Impedance

Inductance

Capacitance

Resistance

Where the streamlines are very close to each other, the pressure will be

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low

zero

high

all of them

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

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Velocity

Weight

Force

Botha B and C

The device in which induced emf is statically induced emf is:

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Transformer

AC generator

Alternator

Dynamo

A laborer carrying a load on his head moves from the rest on a horizontal road to another point where he comes to rest. He has done:

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Minimum Work

Maximum Work

Zero Work

Negative Work

Surface tension of water is reduced by adding

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Detergents

Camphor

Plastic

Both A and B

A cold soft drink is kept on the balance. When the cap is opened, then the weight

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Increases

Decreases

First increases, then decreases

Remains same

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

When the shear stress and shear stain are involved, then their ratio is called

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Young's modulus

Bulk modulus

Shear modulus

all of them

An electric field is generated along the wire when:

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Its resistance is very high

A constant potential is maintained across the wire

Net current through the wire is zero

A constant potential difference is maintained across the wire

Either (A) or (D)

An object is dropped from a height of 100 m. Its velocity at the moment it touches the ground is:

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100 m/sec

140 m/sec

1960 m/sec

196 m/sec

The resultant of two velocities 3 m/sec and 400 cm/sec making an angle 90° with each other is:

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20 m/sec

5 m/sec

3 m.sec

None of these

A body moving along the circumference of a circle of radius R completes one revolution. The radius of the covered path to the angle subtended at the center is:

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Radius of the circle

Twice the radius

Thrice the radius

None of these

Which one of the following has larger value of relative permitivity E_rat room temperature?

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Vaccum

Air

Glass

Water

The rear wheels of an automobile are rotating with an angular velocity of 14 rev/sec which is reduced to 38 rad/sec in 5 second when brakes are applied. Its angular acceleration is:

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5 rad/sec²

-10 rev/sec²

-10 rad/sec²

-5 rev/sec²

Neutron was suggested to be in the nucleus by:

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Rutherford in 1920

Bohar in 1913

Dirac in 1928

Anderson in 1932

None of these

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