Question # 1

Semiconductor diodes are called:

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Ohmic

non ohmic

Both a & b

none of above

The SI unit of E is NC-1 and that of B is Na-1 m-1 then the unit of E/B is.

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ms-2

ms

ms^-1

m-1s-1

The gate, which changes the logic level to its opposite level is called

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NOR gate

AND gate

OR gate

NOT gate

The number of crystal system are

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Three

Five

Seven

Fifteen

In Wilson cloud chamber, ß-particles leave

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Thin and continuous tracks

Thick and continuous tracks

No tracks

Thin and discontinuous tracks

If F1 and F2 are teh magnetic forces acting on a particle and electron respectively when moving perpendicular to the magnetic field then.

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F1=F2

F1>F2

F1<F2

F1 = 4F2

If force in the direction of velocity of conductor, then induced current is directed,

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Anti clockwise

Clock wise

At equilibrium

None of above

Einstein photoelectric equation is

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None of these

mho -m-1 is the unit of.

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Resistance

Resistivity

Conductance

Conductivity

Reflecting mirrors in laser is used to

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Further stimulation

For producing more energetic lasers

Both (a) and (b)

None of these

The mass of an object will be doubled at speed.

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2.6 x 10⁸ m/s

1.6 x 10⁸m/s

2.6 x 10⁷m/s

3.6 x 10⁷ m/s

The electric field created by positive charge is:

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Radially outward

Circular

Radially inward

Zero

The velocity of electron moving is 1st orbit of hydrogen atom is:

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2.09 x 10⁶ ms^-1

2.18 x10⁶ ms^-1

2.19 x 10⁶ ms^-1

3.18 x10⁶ ms^-1

A simple device that prevents the direction of current from changing is called.

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Commutator

Rotor

Armature

Detector

If the number of turns become double but length remain same, then magnetic field in the solenoid become.

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Half

Double

Remain same

Zero

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

1 amu is equal to

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1.0606 x 10^-27 kg

1.66 x 10^-31 kg

1.66 x 10^-34 kg

1.66 x 10^-19 kg

The color code of "Green"

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8

3

5

7

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