Question # 1

In an LRC circiut, the capacitance is made one-fourth, when an resonance . Then what should be change in inductance, so that the circuit remain in resonance?

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4 times

1/4 times

8 times

2 times

Flux through any closed surface is:

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1/ε²_∘ times the total charge enclosed in it

ε²_∘ time the total charge enclosed in it

1/ε_∘ ties the total charge enclosed in ti

ε_∘ time the total charge enclosed in it

Coercive force is used to

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Demagnetize the material

Magnetize the material

Extend it

None of these

The circuit in which current and voltage are in phase, the power factor is:

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Zero

1

-1

2

Both Xenon and cesium have

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33 isotopes

34 Isotopes

36 Isotopes

35 Isotopes

Unit of decay constantλ is:

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ms

m^-1

m

S^-1

S.I unit of strength of electric field is

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J/C

C/V

V/C

N/C

Antiparticle of electron is.

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proton

Photon

Positron

Neutron

Reverse current flows due to

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Majority charge carriers

Minority charge carriers

Electrons

Holes

The number of protons in any atom are always equal to the number of

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Neutrons

Electrons

Positrons

Mesoris

The number of Neutron is²³⁸U₉₂is

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92

238

146

330

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

A step up transformer is used 120 V line to provide 240 V. If primary coil has 100 turns the number of turns is secondary is.

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50

100

150

200

Torque on a current carrying coil

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τ=IBA cos

τ = ILB sinα

τ = IBA sinα

τ = ILBcosα

Useful device to measure resistance, current and voltage is an electronic instrument called.

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Volt meter

Ammeter

Ohmmeter

Digital Multimeter

The vector sum of electric force and magnetic force is called:

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Deflecting force

Lorentz force

Newton force

Faraday's force

A battery move a charge of 40 C around a circuit at constant rate in 20 Sec. The current will be.

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2 A

0.5 A

80 A

800 A

Unit of impedance is:

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Ohm

Ohm^-1

no unit

Ohm m^-1

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