Question # 1

A piece of fuse wire melts when a current of 15 ampere flows through it. With this current. If it dissipates 22.5 W, the resistance of fuse wire will be

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Zero

10Ω

1Ω

0.10Ω

The current in microamperes required to produce one millimeter deflection on a scale placed one meter away from the mirror of the galvanometer, defined the sensitivity of

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ammeter

voltmeter

galvanometer

avo-meter

If a vector lies in second quadrant, than B_xand B_yare:

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-,+

+,-

+,+

-,-

If the slope of the velocity-time graph increases at constant rate with time, then the body is said to have

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uniform deceleration

uniform negative acceleration

average acceleration

uniform positive acceleration

An isochoric process is one which take place at

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Constant internal energy

Constant entropy

Constant volume

Constant pressure

Acceleration of a body is positive, if the velocity of the body is

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constant

increasing

decreasing

none of them

When two protons are brought closer potential energy of both of them:

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Increases

Decreases

Remains same

None of these

Different radioactive material have

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same half lives

different half lives

same mean lives

same total lives

Watt x second is unit of:

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Force

Work

Power

None of these

An emf is set up in a conductor when it

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Is kept in a magnetic field

Is kept in an electric field

Moves across a magnetic field

Both A and B

None of these

At constant volume temperature is increased. Then

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Collision on walls will be less

Number of collisions per unit time will increase

Collision will be in straight lines

Collision will not change

The value of relative permittivity of different dielectrics are:

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Equal

Different

Greater than one

Smaller than one

Both (B) and (C)

The fluid which is incompressible and non viscous is called

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Ideal fluid

Non-ideal fluid

Prefect fluid

All

In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes

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Four-fold

One-half

One-fourth

Zero

The machines which deals with the objects moving with velocities approaching that of light is called:

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Relativistic mechanics

Wave mechanics

Quantum

Statics mechanics

The velocity given to a body to go out of the influence of earth's gravity is known as:

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Terminal velocity

Orbital velocity

Escape velocity

None of these

The smooth or steady stream-line flow is know as

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Laminar flow

Turbulent flow

Both a and b

None of the above

Transmitting antenna emits

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Magnetic waves

Electric waves

Electromagnetic waves

Sound waves

Frequency of red color as compared to that of violet color is:

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Equal

Smaller

Greater

None of these

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

For inducting emf in a coil the basic requirement is that:

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Flux should link the coil

Change in flux should link the coil

Coil should form a closed loop

Both B and C are true

If force and displacement are in opposite direction, the work done is taken as:

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Positive work

Negative work

Zero work

Infinite work

In series RC circuit when R=X_c, then the phase angle is

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0°

90°

70°

45°

An ideal voltmeter has:

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Zero resistance

Small resistance

Large resistance

Infinite resistance

Both A and B

When a person jumps off the ground, the reaction force of the ground is

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greater than the weight of the person

smaller than the weight of the person

equal to the weight of the person

zero

For transmission of both transverse and longitudinal waves, we can use:

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Solid

Gas

Plasma

None of these

When heat is removed from the system

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negative

positive

zero

any one of them

The power factor of resonant series circuit is

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1

0

-1

0.5

The body will move with terminal velocity when it acquires

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minimum speed

zero speed

maximum speed

none of them

Proton was discovered by Rutherford in

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1915

1906

1910

1920

If there identical strings each of constant K are hooked together the spring constant of resultant spring will be:

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3 K

2 K

K/4

K/3

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