Question # 1

From sand, we get a material used for construction of computer chips. That material is called:

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Germanium

Silicon

Copper

Lead

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

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0°

90°

70°

45°

For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is

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A - Z

A

Z

A + Z

Which of the following is not mechanical wave?

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Sound wave

Light wave

wave produced in spring

None of them

The internal energy of a system does not depend upon the

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initial state of the system

final state of the system

path

none of them

Radium was discovered by:

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Becquerel

Marie curie

Pierre curie

Rutherford

Both (B) and (C)

The graph showing the variation of displacement with time is a

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Sine curve

Straight line

Parabola

None of these

Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

If the length of second pendulum becomes four times then its time period will become

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Four time

Two times

Six times

Eight times

Wave disturbances may also come in a concentrated bundle, like shock wave from an aeroplane flying at

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subsonic speed

sonic speed

super sonic speed

any one of them

The electrode connected with the positive terminal of the current source is called

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cathode

anode

electrolyte

position

At what temperature the adiabatic change is equivalent to the isothermal change?

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Zero degree Celsius

Zero Kelvin

Critical temperature

Above critical temperature

An L-R circuit has R = 10 Ω and L = 2 H. If 120 V, 60 Hz A.C. voltage is applied, then current in the circuit will be

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0.32 A

0.16 A

0.48 A

0.80 A

The basic circuit elements of A.C circuit are

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Resistor

Inductor

Capacitor

All the three

A dirty carpet is to be cleaned by heating. This is an accordance with____ law of motion:

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First

Second

Third

None of these

The product of cross-sectional area of the pipe and the fluid speed at any point along the pipe is called

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constant rate

volume rate

flow rate

steady rate

In a resonance situation the amplitude of the motion may become extra ordinarily large, if

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the driving force is large

the driving force is zero

the driving force may be feeble

all of them

Magnetic flux passing through a element whose vector area makes an angle0º with lines of magnetic force is:

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BACosѲ

Zero

BA

BA sinѲ

None of these

In case of metallic conductors, the change carries are:

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Protons

Electrons

Antiprotons

Positrons

Both (A) and (B)

When a force of 0.5 N displaces a body through a distance of 2m in the direction of force, the work done is

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0.5 J

2 J

0.25 J

1 J

The concept of entropy was introduced into the study of thermodynamics in

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1856

1865

1656

1685

Compton was awarded Nobel prize in physics in

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1921

1923

1925

1927

The ratio of the size of the image to that of object is called:

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Focal length

Aperture

Linear magnification

Principal axis

When a fluid is in motion, its flow can be considered as

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turbulent

streamline

either or them

neither of them

In the equation E=mc² value of c is?

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186000 miles per hour

186000 miles per sec

3 X 10⁸m/sec

Both A and C

Both B and C

Which quantity has different dimensions:

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Work

Pressure

Energy

Torque

The rear wheels of an automobile are rotating with an angular velocity of 14 rev/sec which is reduced to 38 rad/sec in 5 second when brakes are applied. Its angular acceleration is:

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5 rad/sec²

-10 rev/sec²

-10 rad/sec²

-5 rev/sec²

The artillery shells travel along parabolic paths under the influence of

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magnetic field

electric field

electromagnetic field

gravitational field

High speed meteors rushing through air reduces to ashes because of:

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Force of gravity

High resistance of air

Drag force

None of these

If the external driving force is periodic with a period compareable to the natural period of the oscillator, then we get

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diffraction

beat

interference

resonance

In case of an ideal gas, the P.E associated with its molecule is

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maximum

zero

minimum

not fixed

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