Question # 1

Which one is not a ductile material

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Lead

Steel

Copper

Wrought Iron

Step up transformer is used.

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Step up D.C. voltage

Step up A.C. voltage

Step up both A.C and D.C.

Step up A.C. current

With the speed of motor, magnitude of back emf

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Remain same

Increase

Decrease

First increases then decreases

The scientist who suggested the presence of neutron was:

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Bohr

Rutherford

Chadwick

J.J Thomson

When charge particle enter perpendicular to magnetic field, the path followed by it is:

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A helix

A circle

Straight line

Ellipes

Selenium is

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Insulator is dark

Insulator in light

Conductor in dark

Semi conductor in dark

X_L=

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2πfL

1/2πfL

2πfL

fL/2π

A force of 0.01 N is exerted on a charge 1.2 x 10^-5 C at a certain point. The electric field at that point is

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1.2 x 10⁴ N/C

1.2 x 10⁴ C/N

8.3 x 10² N/C

8.3 x 10^-2 N/C

A current carrying conductor experience maximum magnetic force in a uniform magnetic field when it is placed.

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Perpendicular to field

Parallel to field

At an angle of 60 ^o to the field

None of these

The central region of a transistor is called.

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Emitter

Collector

Base

Neutral

The number of neutrons in Li are

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2

3

4

7

The rest mass x ray photon is

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Infinite

Zero

1.67 X^-17 kg

All of the above

The field is strong and uniform.

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Inside the solenoid

Surrounding of solenoid externally

Perpendicular to solenoid

All of above

The curie temp for iron is about

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800^oC

740^oC

750^oC

650^oC

Energy released by conversion of 1 amu is

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200 MeV

931 MeV

233 MeV

243 MeV

The unit of impedance is

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Farad

Henry

Tesla

Ohm

When a wire of length 'l' and resistance R is cut into two equal parts then resistivity of each part.

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is doubled

Remains the same

Is halved

Is one fourth

The magnitude of motional emf is given by

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