Question # 1

Alternating current can induce voltage because it has a

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High peak value

Varying magnetic field

Stronger field than direct curren

Constant magnetic field

A convex lens acts as diverging lens when the object is placed:

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Between F and 2F

At 2F

With focal length

Beyond 2F

High speed meteors rushing through air reduces to ashes because of:

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Force of gravity

High resistance of air

Drag force

None of these

One mole of any substance contain

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same number of molecules

different number of molecules

may be same or different

none of them

An inertial frame of reference is that frame of reference in which

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a = 0

a > 0

a < 0

all of them

All trigonometric functions (since, cosine tangent etc. ) are positive in:

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1st Quadrant

2nd Quadrant

3rd Quadrant

4th Quadrant

Static electricity is produced by the transfer of:

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Electrons

Protons

One fluid

Two fluid

None of these

A beam of electrons is provided by an

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electron gun

Suppray

Injection

None of these

A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is

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Charge Q

Potential V

Capacity

Energy U

During the negative half-cycle of the half-wave rectification, the diode

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does not conduct

conducts

either of these

none of these

The number of vibrations in two seconds can be expressed as______if frequency of vibration is f.

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f

2 f

3 f

1/2 f

Unit of impulse in

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Newton

Kg m

Kg m/s

Joule

A 4 m long string fixed at its ends resonate in 4 segments. The wavelength of the waveis:

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4m

0.5m

2m

0.25 m

If the particle is moving in a circle of radius 'r' with uniform angular velocity ω. The angle between r and tangential velocity is

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0^o

90^o

180^o

270^o

The most common method to obtain plane polarized light by using dichoric substance is:

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Selective absorption

Reflection from different surfaces

Refraction from different surfaces

Scattering

Nm^-2is approximately called:

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Telsa

Weber

Pascal

Watt

Guass

A gale blows over a house. The force due to the gale on the roof is

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In the downward direction

In the horizontal direction

In the upward direction

Zero

Two projectiles are fired from the same point with the same speed at angles of projection 60° and 30° respectively.Which one of the following is true?

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Their range will be same

Their maximum height will be same

Their landing velocity will be same

their time of flight will be same

Choose the correct statement

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Rays are normal to wave front

Rays may be normal to wave front

Rays are not normal to wave front

There is no relationship between rays and wave fronts

A motor runs at 20 rev/s and supplies a torque of 75Nm. Power delivered by it is

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6.12 hp

12.6 hp

7.3 hp

8.3 hp

The blood vessels are inflated eve in

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Relaxed states between heart beat

Working state between hear beat

Occasionally

None of these

Carnot engine is ____________ heat engine.

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A reversible

An irreversible

An ideal

Both A and C

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