Question # 1

When the back emf in a current is zero, it draws

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Zero current

Maximum current

Minimum current

Steady average current

The principle regarding the dual nature of light was first discovered by

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Compton

J.J.Thomson

De-Broglie

Heisenberg

An electron moves at 2 x 10² m/sec perpendicular to magnetic field of 2T what is the magnitude of magnetic force:

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1 x 10^-6 N

6.4 x 10^-17 N

3.6 x 10^-24 N

4 x 10⁶ N

Lenz's law was given by Heinrich lenz in:

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1894

1904

1854

1834

Reverse current flows due to

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Majority charge carriers

Minority charge carriers

Electrons

Holes

In current carrying long solenoid the magnetic field produced does note depend upon

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The radius of solenoid

Number of turns per unit length

Current flowing through solenoid

All of above

Which of the modulus of elasticity is involved in compressing a rod to decrease its length ?

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Young's modulus

Bulk modulus

Modulus of elasticity

None of these

The mass spectrum of naturally occurring neon, showing

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1 isotope

2 isotope

3 isotope

4 isotope

One joule of energy absorbed per kilogram of a body is

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Roentgen

Grey

Rem

Curie

Curie temperature is

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Differen for chromium oxide and cobalt

Same for chromium oxide and cobalt

Same for iron and cobalt

None of these

If the north pole of a magnet moves away from a metallic ring

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Clockwise

Anticlockwise

First clockwise and then anticlockwise

None of above

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, Then

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The charge in the plates reduces and potencial difference increase

Potencial difference between the plates increase, stored energy decreases and charge remains the same

Potencial difference between the plates decreases, stored energy decreases and charge remains unchanged

None of them

The highest value reached by the voltage or current is one cycle is called:

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Peak to peak value

Peak value

Instantaneous value

Root mean square value

e/m=

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v/Br

Br/V

VB/r

Vr/B

the force between two charge is 28 N. If paraffin wax of relative permittivity 2.8 is introduced between the charges as medium, then the force reduces to.

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25 N

20 N

10 N

15 N

A pentaralent impurity in Si

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a free electron and a free hole

a free hole

a free electron

No free particle

Cobalt -60 is the source for

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Alpha rays

Gama rays

Beta rays

Neutron

The self induction emf is some times called.

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Motional emf

Constant emf

Back emf

Variable emf

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