Question # 1

A soft iron cylinder is placed inside coil galvanometer to:

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Make field circular and strong

Make field radial and weak

Make field radial and strong

All of above

Ampere second stands for the unit of.

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Charge

emf

energy

Power

The SI Unit of magnetic induction is.

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Weber

Tesla

Gauss

Newton

Transistor was discovered by

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Young

Curie

John Bardeen

Shale's

The critical temperature of mercury is.

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1.18 K

4.2 K

3.72 K

7.2 K

The series in visible region is:

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Balmer series

Pfund series

Paschen series

None of above

An alternating voltage is given by 20 sin 157 t. Th efrequency of alternating voltage is:

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50 Hz

25Hz

100 Hz

75 Hz

Two metallic sphere of radius 2 cm and 4 cm get equal quantity of charge. Which has greater surface charge density ?

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2^nd sphere

Both have same

First sphere

None of these

For Paschen series, the value of 'n' starts from

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2

4

6

8

Very weak magnetic field produced by brain can be detected by

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MRI

CAT scans

Squid

CRO

Energy needed to produce an electron hole in solid state detector is.

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1 to 2 eV

3 to 4 eV

6 to 7 eV

8 to 9 eV

In an electronic transition atom cannot emit.

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Infrared radiations

Visible radiations

Ultraviolet radiations

Gama radiations

Sensitivity of a galvanometer can be increased by

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Decreasing the value of torsional couple

Decreasing number of turns

Decreasing area of plane of coil

Decreasing magnetic field

If the medium between the charges is not free space then electrostatic force will.be

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Increase

Decrease

Remain same

None of these

_______ is the building block of every electronic circuit.

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Semi conductor diode

Resistor

Capacitor

Amplifier

The crystalline structure of NaCl is.

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Cubical

Hexagonal

Tri gonal

Tetragonal

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

A pair of quark and anti quark makes a.

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Meason

harden

Lapton

Baryon

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