Online Test

Question # 1

When a stretched string of length 'I' is plucked form its centre, the string will vibrate in

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one loop

two loops

three loops

four loops

The S.I unit of magnetic induction B is

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Volt

Watt

Farad

Tesla

The intensity of the earth's gravitational field is maximum at

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The centre of the earth

The equator

The poles

None of the above

A galvanometer in which the coil comes to rest quickly after the current passed through it, or the current stopped form flowing through it, is called

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dead best galvanometer

stable galvanometer

shunt galvanometer

sensitive galvanometer

Classical physics is still valid in

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Very small particles

Fast moving particles

Ordinary process

None of these

According to the explanation of photoelectric effect given by quantum theory, a photoelectron could be ejected, if it absorbs

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a single photon

two photons

three photons

four photons

A hole is drilled half-way to the centre of earth. A body weighs 200 N on surface of earth. How much will it weigh at bottom of the hole

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100 N

150 N

200 N

250 N

The Earth rocks are in molten and partly molten state, usually within the Earth surface of

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5 km

10 km

15 km

18 km

When milk is churned,cream separates because of

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Gravitational force

Centrifugal force

Frictional force

None of these

Gamma rays carries a charge

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-e

+e

no charge

-2e

In case of two identical charges placed certain distance apart, the electric field lines are:

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Straight lines

Sine curves

Curved

Both A and B

None of these

The amount of energy equivalent to 1 a.m.u is

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9.315 MeV

93.15 MeV

931.5 MeV

2.22 MeV

A body of mass 5 kg initially at rest is moved by a force of 2 N on smooth horizontal surface.The work done by the force in 10 s is

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20 j

30 j

40 j

60 j

Truth of kinetic energy theory is confirmed by:

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Diffusion of gases

Brownian motion

Both A and B

None of these

Vector A lies in XY plane. For what orientation with both of its rectangular components be negative ?

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I-quadrant

II-quadrant

III-quadrant

None of these

Pauli's exclusion principle states that no two atomic electrons can:

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Be in the same orbital

Be in the same shell

Have same values of all the quantum numbers

Have same angular momentum

Tracers are widely used in medicine to detect

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Reactions in plants

Malignant tumors

Plant improvement

None of these

How many satellites form the Global positioning system ?

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4

3

20

24

On a rainy day if there is an oil drop on tar road colored rings are seen around this drop This is because of

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Interference pattern produced due to thin oil film

Diffraction pattern

Polarization

Total internal reflection of light

For a body moving with constant speed in a horizontal circle,which of the following remains constant?

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Velocity

Centripetal force

Acceleration

Kinetic energy

The gain of the amplifier is independent of

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External structure of OP-amp

Internal structure of OP-amp

Voltage

None of these

In Bragg's formula, the path difference should beam integral multiple of the wavelengths

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d sin θ = nλ

d sin 2θ = nλ

2 d sin θ = nλ

None of these

Magnification of a convex lens is

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M = p/d

M = p/q

M = q/p

None of these

The frequency of free vibrations is known as

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Maximum frequency

Minimum frequency

Natural frequency

None of these

According to the special theory of relativity, mass and energy are:

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Different entities

Related as E=mc²

Inter-convertible

Similar entities

All are true except D

A thin film is a transparent medium whose thickness with the wavelength of light are

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Not comparable

Comparable

Both

None of these

The bands below the valence band are

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completely filled and play active part in conduction process

completely filled and plays no part in conduction process

not completely filled and play active part in conduction process

not completely filled and play no part in conduction process

In R - L series circuit, the current and applied voltage are not in phase. The voltage

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Leads the current

Lags the current

Current and voltage are in phase

None of these

In stationary waves

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Energy is uniformly distributed

Energy is minimum at nodes and maximum at antinodes

Energy is maximum at nodes and minimum at antidotes

Alternating maximum and minimum energy producing at nodes and antinodes

What temperature of a conductor increase the resistance:

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Increases

Remains same

First increases then increases

None of the above

Two physical quantities, of which one is a vector and the other is a scalar, having same dimensions are

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Torque and momentum

Power and pressure

Impulse and momentum

Torque and work

The unknown emf can be determined and given by

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E_x = R/r E

E_x = E L/I

Ex = E I/L

E_x = R/r IE

Which gas is also used along side helium and neon in a gas laser>

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nitrogen

carbon dioxide

oxygen

xenon

The systolic pressure is

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120 torr

130 torr

150 torr

80 torr

Which of the fluid has ideal behavior at low speeds

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Air

Blood

Honey

None of these

The Einstein's changes in length, mass and time are not observed in common life because

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we do not observer them seriously

the masses are too large

their speed is too small than the speed of right

all of them

A fly is sitting on the objective of a telescope pointed towards the moons what effect is impacted in a photograph of the moon taken through the telescope

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The entire field of vision is blocked

There is image of the fly on the photograph

There is no effect at all

There is the reduction in intensity of the image

The symbol that is used to represent rotational inertia or moment of inertia is

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W

I

R

M

Two free parallel straight wires carrying currents in the same direction

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Repel each other

Attract each other

Do not affect each other

Get rotated

Another name for electric potential energy per unit charge is given by:

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Electric intensity

Potential gradient

Electric flux

Potential difference

None of these

While deriving the equation for pressure of a gas, we consider the

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rotational motion of molecules

vibrational motion of molecules

linear motion of molecules

all of them