Question # 1

The "toner" of photocopier is given:

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Positive charge

Negative charge

Remains neutral

All of above

Electric potential at a distance ''r'' from ''q'' is:

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V_r = 1/54πε_∘q/r₂

Vr=1/4πε_∘²q/r

V_r=1/4πε_∘2q/r

V_r=1/4πε_∘q²/r

Special organs called ampullae of lorenzenite are present in.

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Bats

Cats

Dogs

Sharks

After curie temperature.

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Ferromagnetic

Paramagnetic

Magnetic

Diamagnetic

The most abundant isotope of neon is:

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Neon 21

Neon 20

Neon 22

None of above

In Millikan's oil drop experiment a charged particle of mass 'm' is in equilibrium in an will

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Zero

g/2

g

2g

The brightness of the spot of CRO screen is controlled by.

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Anode

Cathode

Grid

Deflecting plates

Earth orbital speed is

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10 km/s

20 km/s

30 km/s

40 km/s

The output from a full wave rectifier is

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An ac voltage

A dc voltage

Zero

A pulsating unidirectional voltage

If the length and number of turns of a solenoid are doubled strength of magnetic field with.

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Be doubled

Become half

Not change

Be four time

Electric power:

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Vx1

V²x1

V/1

V/1²

If the distance between two charges is halved and charges are also doubled, then force between them will be.

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Two time

Four time

Eight time

Sixteen time

Which of the modulus of elasticity is involved in compressing a rod to decrease its length ?

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Young's modulus

Bulk modulus

Modulus of elasticity

None of these

When a PN-Junction is reverse biased the depletion region is.

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Widened

Narrowed

Normal

None of these

Seven resistances are connected as shown in the figures . THe equivalent resistance between A and B is:

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3Ω

4Ω

4.5Ω

5Ω

The peak to peak value of alternating voltage is

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2V_o

V_o

None of these

Radius of first Bohr's orbit is.

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0.053 nm

0.053 mm

0.053 micro meter

0.053 m

The special theory of relativity based on.

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One postulate

Two postulates

Three postulates

Four postulates

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