Question # 1

In a transistor, collector current is controlled by

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Collector voltage

Base current

Collector resistance

All of the above

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

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Transformer

AC generator

Alternator

Dynamo

Velocity of sound in a diatomic as is 300 m/sec. what is its rms velocity?

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400 m/sec

40 m/sec

430 m/sec

300 m/sec

When the mass of the colliding body is much larger than the mass of the body at rest, its velocity after collision.

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Becomes half

Becomes zero

Ramains same

Becomes double

The three equation of motions are useful only for

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linear motion with increasing acceleration

line motion with uniform acceleration

linear motion with zero acceleration

linear motion with varying acceleration

Which of the following does not obey ohm's law?

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Copper

Al

Diode

None

The basic circuit element in A.C. circuits are:

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Resistor and capacitor

Resistor and Inductor

Capacitor only

Both (B) and (C)

None of these

The velocity of sound at same temperature is maximum in

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H₂

N₂

O₂

NH₃

Which of the following is not a unit of power:

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J-sec

Watt

N m/sec

Horsepower

Ferromagnetic substances lose their magnetism when heated above a certain temperature, known as

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critical temperature

curie temperature

high temperature

fixed temperature

The time required to complete on vibration is called

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frequency

total time

time period

velocity

Suppose the water flows out from a pipe at 3 kgs^-1and its velocity changes from 5 ms^-1to zero on striking the ball, then force is

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5.3 N

15 N

17.3 N

19.2 N

Dimension of impulse is same as that of

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Force

Torque

Momentum

Angular momentum

Two boats moving parallel in a river

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Are pulled towards each other due to less pressure in between them

Get part due to increases in pressure in between them

Remain always parallel as there is no change in pressure

None of these

Bulk modulus is involved when the deformation is:

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One dimentional

Two dimentional

Three dimentional

Any of these

None of these

According to the Huygen's principle, the secondary wavelets propagate in the forward direction with a speed equal to

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speed of wave motion

speed of medium

speed of electrons

speed of protons

A fighter plane is chasing another plane,when it opens fire its speed

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Increases

Decreases

Remains constant

Its stops

The transition from solid to liquid state is:

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Abrupt

Slow

Continuous

Discontinuous

Both A and D

If the particle is moving in a circle of radius 'r' with uniform angular velocity ω. The angle between r and tangential velocity is

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0^o

90^o

180^o

270^o

In a soft iron, domains are

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easily oriented along external field and do not return to original random positions

easily oriented along external field and readily returns to originally random positions

do not oriented along external field and also do not returns to original random position

none of them

The mass of the object is a quantitative measure of

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Motion

Momentum

Inertia

None of these

At the maximum height the V_fis

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Constant

Zero

Maximum

None of these

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