Question # 1

Curie temperature is a point where :

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Diamagnetism changes to paramagnetism

Paramagnetism changes to Diamagnetism

Ferromagnetism changes to paramagnetism

Paramagnetism changes to Ferromagnetism

In self induction A coil is connected in__________ with battery and a rheostat.

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Parallel

Series

Both A and B

None of above

A light emitting diode emits light only when

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Reverse biased

Forward biased

Unbiased

None of these

When 10 V are applied to an A.C circuit, the current flowing in it is 100 mA. It impedance is.

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100 Ohm

10 Ohm

1000 Ohm

1 Ohm

A sensitive galvanometer is

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Unstable

Stable

Moderate

Both B and C

Unit of Stephen's constant is

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W m K^-2

W m^-2 K^-4

W m K^-4

None

The first theory about the structure of an atom was introduced by

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Neil Bohr

Einstein

Compton

Rutherford

In three phase voltage across any two lines is about.

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220 V

230 V

400 V

430 V

The mean value of A.C. in a cycle is.

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1

0

I2

Nil

The flow of D.C current is opposed by

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Resistor

Induction

Capacitor

All of these

By modern system of NAVSTAR, the speed any where on the earth can be determined to accuracy about.

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20 ms-1

10 ms-1

2 cms-1

2 ms-1

Iodine -131 is used for the treatment by

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Bones

Eyes

thyroid glands

Lungs

The value of maximum output power is?

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E/4R

E²/4R

E/4R²

Non of above

Two parrallel, metal plates are a distance 8.00 m apart. The electric field between the plates in uniform, Directed toward the right , and has a magnitude of 4.00 N/C. If an ion of charge +2e is released at rest at the left-hand plate. What is its kinetic energy when reaches the right-hand plate?

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4 eV

64 eV

32 eV

16 eV

The dead time of G.M tube is.

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10^-1 sec

10^-6sec

10^-4sec

10^-8sec

Charge on electron is

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1.6 x 10^-19 C

1.6 x 10¹⁹C

1.6 x 10^-17C

1.6 x 10¹⁷C

Joule second is the unit of.

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Energy

Wein's constant

Planck's constant

Boyle's law

The unit of permiability of free space is:

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T.m/A

T.m²/A

T.m/A²

None of these

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