Question # 1

Main reason for world wide use of A.C. is

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It is cheaper

Transmitted

Botha a and b

Reaches in short time

When a pot difference of 4 volt is applied across resistance, 10 J of energy is converted Find charge flows

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0.20 C

2.5 C

5.0 C

10.0 C

The electric field created by positive charge is:

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Radially outward

Circular

Radially inward

Zero

The north pole of a magnet is brought near a metallic ring. The direction of induced current in the ring will be:

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Antoclockwise

Clockwise

First Clockwise and then Antoclockwise

First anticlockwise and then Clockwise

The sensitivity of Galvanometer can be increased by:

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Increasing C/BAN factor

Decreasing C/BAN factor

Increasing angle θ

All of above

A block body is an ideal:

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Absorber

Radiator

Both a & b

None of above

If the kinetic energy of a free electron doubles, its de Broglie wavelength changes by the factor.

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√2

1/√2

2

1/2

After curie temperature.

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Ferromagnetic

Paramagnetic

Magnetic

Diamagnetic

Output of D.C. motor is

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A.C. energy

Mechanical energy

Chemical energy

D.C. energy

The combined effect of resistance and reactance is knows as.

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Inductance

Conductance

Resistance

Impedance

Subatomic particles are divided into groups.

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Photon

Laptons

Hadrons

All of these

The binding energy for_________ is maximum.

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Copper

Glass

Iron

Aluminum

When motor is just started, back emf is almost.

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Maximum

Zero

Minimum

Infinite

The electrical intensity is equal to:

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-Δr/Δv

Δv/Δr

Δv/Δv

-Δv/Δr

In A.C circuit of inductor which one is true

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Voltage leads current by phase angle π/2

Voltage lags current by π/2

Current leads voltage by π/2

Both remain in phase

Radius of first orbit of an atom is r1= 0.053 nm, Radius of second orbit r2 will be.

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0.106 nm

0.212 nm

0.053 nm

0.53 x 10^-10 nm

The radius of 10th orbit in hydrogen atom is.

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0.053 nm

0.53 nm

5.3 nm

53 nm

The basic circuit element in A.C. circuit which controls current.

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Resistor only

Capacitor only

Inductor only

All of these

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