Question # 1

Energy density in an inductor is.

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Directly proportional to magnetic field

Directly proportional to square of magnetic field

Inversely proportional to magnetic field

Inversely proportional to square of magnetic field

Platinum wire becomes white at a temperature of.

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1600^oC

1300^oC

1100^oC

900^oC

The ratio of applies stress to volumetric strain is called:

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Young modulus

Shear modulus

Bulk modulus

Tensile modulus

If a low resistance is connected parallel to a galvanometer then galvanometer is converted.

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Ammeter

Voltammeter

Ohmmeter

Multimeter

Energy produced due to fission of uranium atom is:

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500MeV

200MeV

700MeV

750MEV

Recentaly a complex crystalline structure known as yttrium barium copper oxide (Yba₂Cu₃O₃) have reported to become super conductor at

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163 K

169 K

200 K

100 K

In Pakistan the frequency of A.C. supply is.

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50 Hz

60 Hz

45 Hz

70 Hz

The magnetic field is uniform and stronger

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Outside the solenoid

Inside the solenoid

At the central part of the solenoid

None of these

Coulomb /volt is called.

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Farad

Ampere

Joule

Henry

The Basic circuit element in a D.C. circuits which controls the current and voltage is

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Resistor

Inductor

Capisitor

Transistor

A resistance frequency the impedance of RLC parallel circuit is.

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Zero

Infinite

Maximum

Minimum

A device which converts low voltage or current to high voltage or current is called.

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Transformer

AC generator

Amplifier

Rectifier

The semi conductor diode has the property of

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Two way conduction

Zero conduction

One way conduction

Amplification

If the energy of photon is 10 eV and work function is 5 eV, then the a value of stopping potential will be

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50 V

2 V

5 V

15 V

In 'N' type material, the minority charge carriers are.

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Free electrons

Holes

Protons

Mesons

The critical temperature of Aluminum is.

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3.72 K

1.18 K

7.2 K

8.2 K

The concept of direction is purely

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Relative

Absolute

Relative to the motion

None of these

Magnetic effect of current is used

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To detect a current

To measure a current

In electric motor

All of above

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