Online Test

Question # 1

Which of the following is not measured in units of energy

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Couple (angle turned through)

Moment of inertia (angular velocity)²

Force (distance)

Force (time)

The orbital radius as the revolving body is revolving is

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Very Smaller

Larger

Smaller

None of these

The dimensional formula for angular momentum is:

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(M°L²T^-2)

(ML²T^-1)

(MLT^-1)

(ML²T^-2)

For the manipulation of ordinary ( continuous ) quantities, the basic operations are:

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Multiplication and addition

Subtraction

Division

Both A & C

Magnetic effect at a point caused due to flow a current depends upon the

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quantity of current

distance of current

both the quantity of current and distance from current element

none of all all

The tracks obtained by α-particle in the Wilson Cloud Chamber is

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Thick straight continuous

Thin discontinuous

No definite tracks

None of these

Energy of 1 g uranium is equal to:

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9.0 x 10¹³ J

9.0 x 10¹⁹ J

3.0 x 10¹⁶ J

3.0 x 10¹⁷ J

Figure shows a network of currents the magnitude of currents is shown the current will be

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31 A

13 A

23 A

-3 A

A piece of ice at 0°C dropped into water at 0°C then ice will

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Melt

Be converted to water

Not melt

Partially melt

X-rays cause damage to

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Cancerous cells

Living tissues

Health cells

None of these

In which of the optical fibres, the propagation of light signal is through continuous refraction?

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multi-mode step index fibre

multi-mode graded index fibre

both of them

none of them

In deformation of the material, the potential energy of the molecules due to displacement from their mean positions is

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Lost

Gained

No lost no gain

None of these

Boyle's law is applicable in

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Isochoric process

Isothermal process

Isobaric process

Isotonic process

A ball is dropped downwards After 1 second another ball is dropped downwards from the same point.What is the distance between them after 3 seconds?

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25 m

20 m

50 m

9.8 m

The relative permitivity ∈_r for rubber is

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2.8

3.0

2.90

2.94

The reverse process of materialization of energy is

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Compton effect

Photo electric effect

Pair production

All of these

If two wires in which currents are flowing in the opposite direction are placed parallel and closed to each other, then the magnetic field between then is

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Stronger than sides

Weaker than sides

Equal to the sides

Infinity

The work done in an adiabatic change in a particular gas depends upon only

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Change in volume

Change in temperature

Change in pressure

Change in specific heat

The wave of generated in spring are also called

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Sound waves

Compressional waves

Mechanical waves

None of these

How to energy changes in antinodes all at their extreme displacement

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Wholly P.E.

Wholly K.E.

Changes from P.E. to K.E.

A and B

The field around a moving charge is called

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Electric field

Magnetic field

Gravitational field

None of the above

Geysers usually occur in

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Hot regions

Cold region

Volcanic regions

All of these

The value of 'g' at the centre of earth is

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g

zero

g/2

None of these

To wavelength of light by his experiment , Newton utilized:

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Wavelength of light

Intensity of light

amplitude wave

None of above

A strong magnetic field is applied on a stationary electron then the electron

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Moves in the direction of its field

Moves in the opposite to the direction of field

Moves perpendicular to the direction of field

Remains stationary

Three resistors of resistance R each are combined in various ways.Which of the following cannot be obtained?

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3 R Ω

2 R/4 Ω

R/3Ω

2R/3 Ω

If we conductor electrons and photons of the same wavelength,then they will have the same

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Velocity

Angular momentum

Energy

Momentum

What is the bulk modulus of a material?

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strain/volumetric strain

volumetric stress/strain

stress/volumetric strain

volumetric stress/volumetric strain

Photodiode is used for

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Light display

Detection of light

Emission of light

None of these

On a cold morning a metal surface will feel colder to touch than a wooden surface because

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Metal has high specific heat

Metal has high thermal conductivity

Metal has low specific heat

Metal has low thermal conductivity

The momentum of a body is p and its kinetic energy is E its momentum become 2p its kinetic energy will be

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E/2

3E

2E

4E

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

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anode

electrolyte

cathode

atoms

The light from two lasers passes through a vacuum. One laser emits red light and the other emits green light. Which property of the two laser beams must be different?

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amplitude

plane of polarisation

speed

frequency

1 torr is expressed as

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136.5 Nm^-2

13.3 Nm^-2

133.3 Nm^-2

130.5 Nm^-2

Victor de-Brogile received the Nobel prize in physics in

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1925

1929

1932

1935

What positive effect can radiations (gamma-rays) have on a plant?

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make it yield higher

make the fruit better in quality/size

make it more resistant to dieases

all of them

In an inertial frame of reference the weight of body equal to

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Force of attraction

Coulomb's force

Force of gravity

All of these

The characteristics x-rays appear as discrete lines on a

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Discrete spectrum

Continuous spectrum

Band spectrum

All of these

Energy can be added to a system even though heat transfer is

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Maximum

Minimum

Zero

None of these

The charges in generation of electromagnetic waves depends on

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Applied potential

Frequency of charges

Time period

All of them

Transformer works on:

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A.C only

D.C

High voltage only

A.C & D.C