Online Test

Question # 1

An airplane flies 400 m from north and then files 300 m south and then flies 1200 m upwards then net displacement is

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1200 m

1300 m

1400 m

1500 m

A light wave produced by oscillating charge consists of a periodic variation of

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electric field

magnetic field

either of them

both of them

The path difference and phase difference are related to each other as

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Phase difference = (2π) x path difference

Phase difference = (2π/λ) x path difference

Phase difference = (λ/2) x path difference

Phase difference = (2λ/π) x path difference

The wave form of SHM is

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Pulsed wave

Square wave

Triangular waved

Sine wave

P-type semi conductor is electrically

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Positive charged

Negatively charged

Neutral

No one

Speed of sound is air at 20°C is

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307 ms^-1

315 ms^-1

332 ms^-1

300 ms^-1

In sound waves during compression

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Density medium is maximum

Pressure of medium is maximum

Density of medium is minimum

Both A and B

The diffraction is found to be prominent when the wavelength of light is

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small as compared with the size of obstacle

large as compared with the size of obstacle

equal as compared with the size of obstacle

Very small as compared with the size of the obstacle

The inductor coil is often use for controlling

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A.C.

D.C.

A.C. and D.C.

None of these

The unit of Planck's constant h is same as that of

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Energy

Work

Linear momentum

Angular momentum

If moon radius 1600 km and g on its surface is 1.6 ms^-2Then the escape velocity on the moon is

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1600 ms^-1

50.6 ms^-1

50.8 ms^-1

2263 ms^-1

Mass of neutron is nearly same as that of

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Meson

Proton

Electron

Lepton

The projectile is the motion which is

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One dimensional

Two dimensional

Three dimensional

None of these

The output of a two-input AND gate has output 1 only when

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Both inputs are 3

Both inputs are 1

Either input is 2

Either input is 6

When the magnitude of the drag force becomes equal to the weight, the net force acting on the droplet

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Minimum

Zero

Maximum

None

When the pn-junction is forward biased, the current flows through it is of the order of

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milli-amperes

amperes

nano-amperes

micro-amperes

The waves of generated springs are also called

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Sound waves

Compressional waves

Mechanical waves

None of these

General theory of relativity is applicable in the

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Inertial frame of reference

Non-inertial frame of reference

Both frames of reference

None of these

A change in position of a body from its initial position to its final position is known as

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relative motion

displacement

distance

acceleration

The velocity of free electrons at room temperature due to their thermal motion is

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Several hundred km/s

Several thousand km/s

Several kilometer per second

None of these

The S.I. unit of an electric flux is

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NmC^-1

NmC^-2

Nm² C^-1

Nm² C^-2

Most of electrons in the base of an NPN transistor flow:

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Out of the base load

Into the collector

Into the emit

Into the base supply

The velocity of the body is zero at

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Mean position

Extreme position

Between mean and extreme position

None of these

Can a body rotate about its centre of gravity under the action of its weight ?

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No

yes

Both

None of these

Magnetic flux density at any point due to current carrying conductor can be computed by:

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Ampere's law

Faraday's law

Lenz's law

Newton's law

Coulomb's law

Solids having partially field conduction bands are

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Insulator

Semiconductor

Super conductor

Semi conductor

The path difference involved in interference in thin films depends upon

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Thickness and nature of thin films

Angular of incidence of light

Nature of media on both sides of thin film

All of these

A line whose tangent at each point is in the direction of an electric intensity at that point is called

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Charge

Voltage

Electric force

None of these

The gas filled in a glass tube in e/m experiment is hydrogen at

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Low pressure

Very low pressure

High pressure

None of these

The intensity of γ-rays in solids falls off with the depth of penetration into the material

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Directly proportional

Exponentially

Inverse proportionally

None of these

All real heat engines are less efficient than carnot engine due to

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Work substance

Friction

0 K

All of these

In radar system, the elevation and speed of an aeroplane is determined by using

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Microwaves

Radio waves

X-rays

None of these

The graph of a D.C terminal voltage is a

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circle

parabola

straight line

curve

The distance between two consecutive crests or trough is called

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Amplitude

Frequency

Wavelength

None of these

In the unit of unified mass scale, the mass of an electron is:

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1.007276u

1.008665u

0.00055u

0.000055u

None of these

The colour code for the colour Gray is

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7

8

9

5

The distance to the nearest galaxy is

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10²⁰ m

10²⁹ m

10³⁰ m

10³¹ m

If the voltage applied to gate is 0.5 volt, the gate will recognize it as

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Low

High

Very low

None of these

Max Planck received the Nobel Prize in Physics in

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1915

1918

1923

None of these

One gray is equal to

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1 N kg^-1

1 dyne kg^-1

1 J kg^-1

None of these

The 'β' is the coefficient of the gas for

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Linear expansion

Volume expansion

Area expansion

None of these