Question # 1

In above figures, tell which set of graphs shows that a body is moving with uniform velocity:

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(i) and (ii)

(ii) and (iii)

(iii) and (iv)

The work is stored in the inductor as

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Electric potential energy

Elastic potential energy

Magnetic energy

Absolute potential energy

When the upward drag force of the fluid becomes equal to downward force of gravity of the droplet, then its velocity:

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Starts increasing

Starts decreasing

Becomes constant

Is called escape velocity

At higher frequency of the alternating current, the capacitive reactance X_c

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Increases

Decreases

Remains the same

Increases only when the voltage increases

A potential barrier of 0.7 V exists across p-n junction made from:

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Germanium

Silicon

Arsenic

Gallium

Indium

First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about

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how heat is absorbed

how heat extracted

how this conversion takes place

none of them

The force acting on a charge moving in a magnetic field

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is perpendicular to the both magnetic field and direction of motion

is proportional to the magnetic of charges

vanishes when the motion is directly opposite to the direction of field

all of the above

The charged nucleus of an atom itself spins its magnetic field

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equal to the field produced by orbital electrons

greater than the field produced by orbital electrons

much weaker than the field produced by orbital electrons

none of these

A transistor has:

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One region

Two regions

Three regions

Four regions

None is correct

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

Tick the conservation force:

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Tension in a string

Air resistance string

Elastic spring force

Frictional force

A force of 50 dynes is acted on a body of mass 5 g which is at rest, for an interval of 3 seconds, then impulse is

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0.15 x 10^-3Ns

0.98 x 10^-3Ns

1.5 x 10^-3Ns

2.5 x 10^-3Ns

It is possible to recognize a person by hearing his voice even if he is hidden behind a solid wall. This is due to the fact that his voice

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Has a definite pitch

Has a definite quality

Has a definite capacity

Can penetrate the wall

The basic circuit element in D.C. circuit is:

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A capacitor

A resistor

An inductor

Both (A) and (C)

Both (A) and (B)

The velocity of sound in air depends upon

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Density and elasticity of gas

Pressure

Wavelength

Amplitude and frequency of sound

The image of the tip of a needle is never sharp because of

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Polarization of light

Interference of light

Diffraction of light

Reflection of light

1 gm-cm^-3is equal to:

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10³kg-m^-3

10^-3kg-m^-3

1 kg-m^-3

10⁶kg-m^-1

A 2 kg block is held 1 m above floor for 50 seconds. The work done is:

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Zero

10.2 J

100 J

980 J

The smooth or steady streamline flow is known as

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laminar flow

turbulent flow

both of them

none of them

Ethanol (alcohol) is a type of:

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Electric fuel

Bio fuel

Nuclear fuel

None of these

A (100 W , 200 W) bulb is connected to a 160 V power supply. The power consumption would be

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64 W

80 W

100 W

125 W

An object undergoes S.H.M has maximum speed when its displacement from the mean position is

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maximum

zero

half of the maximum value

one third of the maximum value

An inertial frame is that frame in which

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a>0

a=0

a<0

none of these

The working of galvanometer depends upon torque exerted on a current carrying coil in

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magnetic field

electric field

gravitational field

nuclear field

A particle moving uniformly along circle its projection along diameter performs

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Linear motion

Projectile motion

SHM

Rotatory motion

In an elevator moving vertically up with an acceleration 'g' the force exerted on the floor by a passenger of mass M is

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Mg

1/2 Mg

Zero

2 Mg

Suppose the water flows out from a pipe at 3kg s^-1and its velocity changes from 5m s^-1to zero on striking the wall, then the force exerted by water on wall will be

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5 N

10 N

15 N

20 N

One KWh is equal to:

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3.6 x 10²J

3.6 KJ

3.6 x 10¹KJ

3.6 MJ

Body which falls freely under gravity provides good example of motion under:

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Uniform acceleration

Non-uniform acceleration

Uniform velocity

None of these

An induced current can be produced by:

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Constant magnetic field

Changing magnetic field

Varying magnetic field

Constant electric field

None of these

1 amu is equal to

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1.66 x 10^-24kg

1.66 x 10^-19kg

1.66 x 10^-34kg

1.66 x 10^-27kg

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