Question # 1

Tick the conservative force

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Tension in a string

Air resistance

Elastic spring

Frictional force

A stone tied to the end of a 20 cm long string is whirled in a horizontal circle. If centripetal acceleration is 9.8 m/sec², then its angular velocity is rad/sec is:

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22/7

7

14

21

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

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number of photoelectrons

size of the photoelectrons

charge on photoelectrons

K.E of photoelectrons

The resistance of 20 cm long wire is 10Ω. When the length is changed to 40 cm. The new resistance is

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10Ω

20Ω

30Ω

40Ω

The SI unit of capacitance is

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Farad

Henry

Ohm

Volt

The potential difference across the conductors should be maintained constant by connecting the ends of wire to the terminal of a device called a source of

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power

current

resistance

temperature

A tube tapers from 20 cm diameter to 2 cm, the velocity at first cross-section is 50 ms^-1then velocity at second cross-section is

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5000 cms^-1

500 cms^-1

50 cms^-1

0.5 cm/s

Change in momentum is one second called.

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Impulse

Force

Energy

Work

The liquid which conduct current is known as

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heating effect

chemical energy

electrolyte

ohm's law

Electric flux is defined by the relation

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E.A.

E x A

E/A

none of these

Pressure exerted by a gas on the walls of its container in due to

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adhesion between the gas molecules and the container

cohesion between the gas molecules and the container

collision between the gas molecules and the container

surface tension of the gas

If a source of emf is traversed from positive to negative the potential change will be:

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Positive

Negative

Zero

Constant

If an iron ball and a wooden ball of the same radius was released from a height h in vacuum,then time taken by both of them to reach ground will be

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Unequal

Exactly equal

Roughly equal

Zero

A proton is about 1840 times heavier than an electron When it is accelerated by a potential difference of 1 kV,its kinetic energy will be:

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1840 keV

1/1840 keV

1 keV

920 keV

Which quantity has different units from the others

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Mass X velocity

Force X time

Energy / velocity

Power X time

The efficiency of half wave rectifier is:

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25.6%

1.2%

40.6%

66.6%

The drag force increases as the speed of the object

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Decreases

Increases

Decreases rapidly

None of these

Which type of fibre is used to send the signals of long distances?

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single mode step index fibre

multimode step index fibre

multimode graded index fibre

all of them

If a body, under the action of a number of forces, is in equilibrium, then it is

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at rest

in uniform motion

either at rest or in uniform motion

none of them

If the bright fringe into be observed then we have relation

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Y = mLd/λ

Y = mλL/d

Y = λd/mL

Y = λL/md

In Young s double slit experiment the separation between the slits in halved and the distance between the slits and the screen is doubled the fringe with will

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Be doubled

Be quadrupled

Remain the same

Be halved

The force which aries when one layers of liquid slides over another layer is measure by

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Viscosity

Velocity

Momentum

Acceleration

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