Question # 1

The SI unit of magnetic induction 'B' Tesla is equal to.

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NA-1m-1

Nam-1

NA-1 m

Na2m-1

When a conductor moves across a magnetic field an emf is set up this emf is called.

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Variable emf

Constant emf

Back emf

Induced emf

Conductors have conductivities of order:

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10³(Ωm)-1

10⁷(Ωm)^-1

10⁷Ωm^-1

10^-6Ω

Glass and high steel carbon are example of.

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Ductile substances

Brittle substances

Soft substances

Hard substances

A photo diode can turn its current ON and OFF in

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Micro seconds

Mega seconds

Nano seconds

Mili seconds

Lenz's law is a consequence of the law of conservation of

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Charge

Momentum

Energy

Angular momentum

The Lenz's law fulfils.

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Law of conservation of energy

Law of conservation of charge

Law of conservation of momentum

Kirchhoff's law

The potential difference between the head and tail of an electrical to

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600 Volt

700 Volt

800 Volt

900 Volt

The most abundant isotope of neon is:

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Neon 21

Neon 20

Neon 22

None of above

Lenz's law deals with

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Magnitude of emf

Direction emf

Direction of induced current

Resistance

The jerks in D.C. motor are created by the use of.

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Armature

Commutators

Split rings

Source of emf

Iodine -131 is used for the treatment by

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Bones

Eyes

thyroid glands

Lungs

Pulsating output of full wave rectifier can be made smooth by using circuit called.

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Filter

Amplifier

Resistor

Transistor

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

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2

4

6

8

The potential difference across the depletion region of germanium is.

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0.3 V

0.5 V

0.7 V

0.8 V

The stopping potential for a certain metal is 10 volts. Thus work function for the cathode is.

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10 J

1.6 X 10^-18 J

1.6 X 10^-19 J

1.6 X 10³⁰ J

The induced emf in a coil is proportional to:

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Magnetic flux through the coil

Rate of change of Magnetic flux through the coil

Area of the coil

Product of magnetic flux flux and area of the coil

Pair production cannto take place in vacuum because :

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Mass in not conserved

Momentum is not conserved

Energy is not conserved

Charge is not conserved

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