Question # 1

When resistance of a current carrying wire increases due to rise in temperature, the drift velocity of electrons:

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Decreases

Increases

Remains the constant

Either of these

None of these

Peak value of alternative current is:

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one of its Instantaneous value

Equal to its RMS value

The same as its peak-to-peak value

Both (B) and (C)

None of these

At 'resonance' the transfer of energy from deriving source to the oscillator is

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maximum

minimum

zero

none of them

No spark plug is needed in

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petrol engine

diesel engine

both of them

none of them

Transformer is used to

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Increase alternating current

Increase d.c voltage

Increase & Decrease emf

All answers are right

Conversion of alternating current into direct current is called

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amplification

rectification

conduction

polarization

The dot product of electric field intensity E and vector area A is called

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Electric potential

Electric flux

Electric field

Magnetic field

Gas constant per molecule is called:

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Universal gas constant

Stefen's constant

Boltzmann constant

Gravitation constant

Newton published laws of motion in his famous book "principia" in

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1867

1667

1676

1687

Bernoulli's equation is applicable for

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turbulent flow

streamline flow

both (a) and (b)

all kinds of flows

The velocity of a body at any instant of its motion is known as

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average velocity

instantaneous velocity

uniform velocity

none of them

One KWh is equal to:

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3.6 x 10²J

3.6 KJ

3,6 x 10¹KJ

3,6 MJ

A ball falls on the surface from 10 m height and rebounds to 2.5 m. if the duration of contact with the floor is 0.01 seconds then the average acceleration during contact is

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2100 m/s²

1400 m/s²

700 m/s²

400 m/s²

The charge carries in the electrolyte are:

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Positive ions

Negative ions

Either (A) or (B)

Both (A) and (B)

Neither (A) nor (B)

In the forward biases situation, the current flowing across the p-n junction is a few:

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amperes

Milli amperes

Micro amperes

Pico amperes

None of these

CRO deflects the beam of

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proton

a-particle

electron

neutron

The band above the valence band is called

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high energy band

conduction band

empty band

none of them

Boyle's law is applicable in

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Isochoric process

Isothermal process

Isobaric process

Isotonic process

The natural frequency of a pendulum which is vibrating freely, depends upon its

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mass

length

material

all of them

Which waves are used in sonography?

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Microwaves

Infra red waved

Sound waves

Ultrasonic waves

If one volt is needed to cause a current of one ampere to flow in a conductor, its resistance is

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one ohm

one joule

one volt

one ampere

The obvious effect/s of current is/are:

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Heating effect

Magnetic effect

Chemical effect

Both (C) and (B)

All of these

If every particle of the flow that passes a particular point, moves along the same path as followed by particles which passed the point earlier, then this flow is said to be

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turbulent

streamline

abrupt

none of them

A thermistor is a resistor which is:

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Light Sensitive

Heat Sensitive

Sound Sensitive

All of these

None of these

Neutron was discovered in

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1915

1920

1925

1932

A long wire wound tightly on a cylindrical core is called:

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Potentiometer

Solenoid

Toroid

Wheat and stone bridge

None of these

0.10 cm can be written as:

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1.0 x 10^-2m

1.0 x 10^-3cm

1.0 x 10^-4cm

1. x 10^-4m

The transition from solid to liquid is actually from:

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Order to disorder

Disorder to order

Order to order

Disorder to disorder

None of these

Selenium is:

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An insulator

A conductor

Insulator in the dark and becomes conductor when exposed to light

Conductor in the dark only

None of these

If water in a closed bottle is taken up to the moon and opened, the water gets

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Freeze

Boiled

Dissociated into O₂and H₂

Evaporated

In a normal healthy person the value of diastolic pressure is

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75 - 80 torr

100 torr

120 torr

none of them

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