Question # 1

If the number of turns of a solenoid (carrying a steady current I) is doubled without changing the length of a solenoid, then magnetic field:

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Becomes Half

Becomes double

Is not affected

Becomes one fourth

None of these

Teh consumption of energy by a 1000 watt heater in half an hour is:

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5 Kwh

0.5 Kwh

2.5 Kwh

3.2 Kwh

Resistance is measured in

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volts

ampere

ohm

watt

The work done in moving a body between two points in a conservative field is independent of the

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Direction

Force applied

Path followed by the body

Power

The Stephen-Boltzmann law for the black body radiation is given by

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E = T²

E = -T²

E = T⁴

E = -T⁴

The electric field will be uniform

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Near a positive point charge

Near a negative point charge

Between two oppositely charged parallel metal plates

None of above

A body with frequency would complete one vibration in:

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f seconds

1/f seconds

1 second

f²second

The amplitude of oscillation of each atom in a metallic crystal rises with the

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rise in temperature

decrease in temperature

even temperature remains constant

all of them

The positron was discovered by:

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In cosmic radiation

In 1932

By Carl Anderson

All above

By direc

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

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5 rad/sec²

-10 rav/sec²

-10 rad/sec²

-5 rav/sec²

Pascal is a unit of

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Mass

Power

Pressure

Intensity of light

Angular displacement is a vector quantity for

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Small value of Δθ

Very small value of Δθ

All values of Δθ

None of these

Time of flight of projectile is

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Vi sinθ /g

2Vi Sinθ /g

2Vi sinθ/g

None

The atom or molecules in crystalline solids are held together by:

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Cohesive force

Adhesive force

Gravitational force

Magnetic forces

Name of projectile is the same for the following pair of angles:

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0° and 45°

35° and 55°

15° and 60°

30° and 75°

Examples of polymers are

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Polythene

Polystyrene

Nylon

All of them

If the focal length of objective is 10 mm find its magnification

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18

19

20

21

In the formula for velocity of efflux v = √2gh, h is the

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Height of liquid column from bottom of vessel

Height of orifice from the bottom of the vessel

Height of liquid column above the orifice

Height of the vessel

Fire fighters have a jet attached to the head of their water pipes in order to

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Increase the mass flow per sec

Increase the volume flow per sec

Increase the velocity of water flowing out

Avoid wastage of water

Diameter of the nucleus is of the order of

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10^-10m

10^-12m

10^-15m

10^-18m

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