Question # 1

A stationary sound wave has frequency 165 Hz (speed of sound in air = 330 m/s) then distance between two consecutive nodes is

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2 m

1 m

0.5 m

4 m

The motion of molecules in gases is:

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Orderly

Random

Circular

All of these

The electric flux is linked with a surface will be maximum when

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The surface is held parallel to the electric field

The surface is held perpendicular to the electric field

The surface makes an angle of 45° with the electric field

All of the above

In the compton's effect, it is found that the wavelength of incident x-rays is

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greater than the wavelength of scattered x-rays

equal to the wavelength of scattered x-rays

less than the wavelength of scattered x-rays

any one of these

A 60 W bulb operates on 220 V supply. The current flowing through the bulb is

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11/3 A

3 A

3/11 A

6

With the help of 50 K v electron microscope, a resolution of

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0.5 to 1 m to possible

1 m to 10 m is possible

0.5 to 1 nm is possible

1 to 10 nm is possible

What is the coefficient of mutual inductance, when the magnetic flux changes by 2 X 10^-2Wb, and change in current is 0.01 A?

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2 H

3 H

1/2 H

Zero

It two waves of amplitude 'a' produce a resultant wave of amplitude a, then the phase difference between them will be

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60°

90°

120°

180°

The rate at which the free electrons pass through any section of a metallic wire from right to left is:

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Greater than the speed at which they pass from left to right

Less than the speed at which they pass from left to right

The same speed at which they pass from left to right

Any of above

None of them

In crystalline solids, atoms are held about their equilibrium positions depending upon the strength of:

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Adhesive force

Nuclear forces

Inter atomic cohesive force

Electromagnetic force

None of these

Velocity is a

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scalar quantity

vector quantity

constant quantity

none of them

Flux through a closed surface of any shape and flux through the surface of a sphere drawn around a charge are:

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Different

Same

Such that it is greater in the first case

Such that it is greater in the second case

None of these

The device which allows only the flow of an A.C. through a circuit is

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Capacitor

Inductor

D.C. motor

Battery

Specific resistance of a wire depends upon

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Length

Cross-section area

Mass

None

when the deformation produced in the material become permanent, this type of behaviour is called

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proportionality

elasticity

plasticity

none of them

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

Any superconductor with critical temperature above 77 K, is referred as

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low temperature superconductor

high temperature superconductor

very low temperature superconductor

none of them

A swing has

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one natural frequency

two natural frequencies

three natural frequencies

four natural frequencies

Where the streamlines are very far apart from each other, the pressure will be

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low

zero

high

all of them

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 position

do no oriented along external field and also do not returns to originally random position

none of them

We cannot utilize the heat contents of oceans and atmosphere because

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there is no reservoir at the same temperature

there is no reservoir at the temperature lower than any one of two

there is no reservoir at the temperature higher than any one of two

none of them

Beta particles are

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hydrogen nuclei

helium nuclei

electrons

photons

A resistance used in galvanometer to make it voltmeter is called

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shunt resistance

high resistance

zero resistance

none of these

When the particles of the medium vibrate about their mean position, along the direction of the motion of waves, then the waves are called:

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Longitudinal waves

Transverse waves

Water waves

Complex waves

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

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1.66 m

1.66 x 10^-10m

1.66 x 10^-29cm

1.66 x 10^-29m

In describing function of digital systems, 1 represents:

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Closed switch

True Statement

Lighted bulb

Only (B) and (C)

All are true

The RMS value of alternating current is:

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0.7 times at the peak value

0.5 times the peak value

0.7 times the Instantaneous value

Equal to maximum voltage

None of these

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 range of projectile is 50 m whenθ is inclined with horizontal at 15°. What is the range whenθ becomes 45°?

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400 m

300 m

200 m

100 m

Laplace formula is derived from

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Isothermal change

Adiabatic change

Isobaric change

None of these

A transistor has:

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One region

Two regions

Three regions

Four regions

None is correct

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