Question # 1

Two opposite point charge of same magnitude separated by distance 2d, electric potential mid way between them is.

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1 V

2 V

Zero

V/2

Resistance tolerance of silver band is.

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10%

6%

7%

5%

A charged particle having charge 'q' is moving at right angle to magnetic field. The quantity which varies is.

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Speed

Kinetic energy

Path of motion

angular velocity

The free electrons experience force.

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In direction of -E

In direction of E

Both A and B

All of the above

Which is not true for X rays

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X rays are not defected by electric field

X rays are polarized

X rays consist of electromagnetic waves

X rays can be diffracted by grating

Conductors have conductivities of order:

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10³(Ωm)-1

10⁷(Ωm)^-1

10⁷Ωm^-1

10^-6Ω

The electric intensity due to two oppositely charged plates is

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None of these

One joule of energy absorbed per kilogram of a body is

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Roentgen

Grey

Rem

Curie

Energy stored in inductor is.

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1/2 L I²

1/2 LI

1/2 L2I

1/2 L2I2

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

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Widened

Narrowed

Normal

None of these

In Series resonance circuit the impedance of circuit art resonance frequency, is

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Maximum

Minimum

It is unequal to R

None of above

Write the SI unit of magnetic flux.

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Tesla

Weber

Weber m-2

Tesla m2

The unit of impedance is.

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Henry

Hertz

Ampere

Ohm

The rod of unit length is moving at 30 o through a magnetic field of 1 T. If the velocity of rod is 1 m/s, then induced emf in the rod will be given by

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I V

0.25 V

0.5 V

0.6 V

Marie Curie and Pierre Curie discovered.

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Uranium

Uranium and Radium

Polonium and radium

Radium

Helium-Neon laser discharge tube contains neon

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82%

15%

25%

85%

If speed of rotation of a generator is doubled the output voltage will be.

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Remain same

Double

Four time

One half

When a coil is moved in a uniform magnetic field, an induced emf is produced due of change in

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Flux density

Electric flux

Magnetic flux

Magnetic field strength

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