Question # 1

A closed surface contains two equal and opposite charges. The net electric flux from the surface will be

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Negative

Positive

Infinite

Zero

When a silicon crystal is doped with a pentavalent element, such an extrinsic semi-conductor is called

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p-type semi-conductor

n-type semi-conductor

either of them

none of them

A car moves for half of its time at 80 km/h and rest half of time at 40 km/h, The total distance covered is 60 km. What is the average speed of the car?

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60 km/hr

80 km/hr

120 km/hr

180 km/hr

In case of streamed lined flow of liquid, the loss of energy is

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Maximum

Minimum

Infinite

equal to what is in turbulent flow

The smooth or steady streamline flow is known as

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laminar flow

turbulent flow

both of them

none of them

An induced current can be produced by:

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Constant magnetic field

Changing magnetic field

Varying magnetic field

Constant electric field

None of these

A one microfarad capacitor of a TV is subjected to 4000 V potential difference. The energy stored in capacitor is

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8 J

16 J

4 x 10^-3J

2 x 10^-3J

If we plot graph between potential difference (V) and current (I) obeying ohm's law, it will give us

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parabola

straight line

hyper bola

ellipse

A capacitor acts as an infinite resistance for

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AC

DC

Both AC and DC

Neither AC nor DC

The current sensitivity of the galvanometer is

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C/BAN

BAN/C

CAN/B

CBN/A

There is a regular arrangement of molecules in a

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amorphous solids

polymeric solids

crystalline solids

none of them

A person standing on a rotating platform has his hands lowered.He suddenly outstretches his arms.The angular momentum

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Becomes zero

Increases

Decreases

Remains the same

Mathematically the vertical velocity component is

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At what point/points in its path does a projectile have its maximum speed

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At the point of projection

At the point where its strikes the ground

Both

None of these

A hole in a semi-conductor material is treated as

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positive charge

negative charge

neutral

none of them

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

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g

zero

g/2

None of these

Unit cell has a basic structure of

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One dimensional

Two dimensional

Three dimensional

None of these

When passes from medium to another, deviate from its path is called

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reflection

refraction

diffraction

transmission

The fringes produced in Young's double slit experiment will be wider if the distance between the two slits is

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small

large

zero

very large

Calculate the critical angle when core refractive index is 1.50 and cladding of refractive index 1.48

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70.3^o

80.9^o

80.6^o

89.6^o

The Bernoulli's equation often expressed in

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P + ρV² + ρgh = constant

P + 1/2 ρV + ρgh = constant

P + 1/2 ρV² + ρgh = Constant

P + 1/2 ρV² + gh = constant

If v is the velocity of flow of liquid through a tube of area of cross-section A then according to equation of continuity

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v/A = constant

A/v = constant

Av = constant

None

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