Question # 1

Which of the following quantities remain constant in step up transformer?

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Current

Voltage

Power

Heat

Domains are existed in

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Ferromagnetic materials

Paramagnetic materials

Semi conductors

Diamagnetic materials

In Helium Neon laser, discharge tube is filled with Neon gas.

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10%

15%

85%

90%

The peak to peak value of alternating voltage is

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2V_o

V_o

None of these

Which one is not present in A.C. generator.

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Armature

Magnet

Slip rings

Commutator

The peak value of alternating current is 5√2 A. The mean square value of current will be:

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5A

2.5A

5√2A

5²

In photocopier, then drum is coated with layer of.

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Aluminium

Copper

Selenium

silver

Capacitance of a capacitor does not depend upon.

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Distance between plates

Area of plates

Electric field between plates

Medium between plates

Total flux through a closed surface depends on.

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Shape of surface

Medium only

Charge enclosed only

Charge and Medium

The charge number of Ba is.

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197

141

56

85

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 sensitivity of galvanometer is given by

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CAN/B

C/BAN

BAN/C

BN/CA

Presence of dielectric always.

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Increase the electrostatic force

Reduces the electrostatic force

Do not effect electrostatic force

Doubles the electrostatic force

The first superconductor was discovered in:

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1831

1911

1921

1876

The energy of 4th Orbit in hydrogen atom is.

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-2.51 eV

-3.50 eV

-13.60 eV

-0.85 eV

In a certain circuit, I_{B = 40 µA,}I_C= 20 mA

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450 amp

0.45 amp

5 m amp

500 amp

100 micro F capacitor is connects to an AC voltage 24 V and frequency 50 Hz. The reactance of the capacitor is.

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30.8 Ohm

31.8 Ohm

34.8 Ohm

40 Ohm

Binding energy per nucleon is maximum for

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Platinum

Iron

Uranium

Lead

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