Question # 1

The current induced can be increased by:

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Using a stronger magnetic field

Moving the loop faster

Replacing the loop bay coi of many turns

All of above

The early Greeks believed that matter waves was

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Discrete

Continuous

Both continuous and discrete

All of above

Those elements whose charge number z is greater then __________ are unstable:

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80

79

82

83

The unit of magnetic induction B is

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Coulomb

Ampere

Coulomb/ampere

Weber/m²

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

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Commutator

Rotor

Armature

Detector

Electro magnetic waves emitted from radio antenna are.

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Stationary

Longitudinal

Transvers

Both a and b

A charge Q is divided into tweo parts q and Q-q and seperated by a distance R. The force of equilibrium between them will be maximum when:

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q=Q/4

q=Q/2

q=Q

None of these

The mass of proton in amu is:

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1.07276

1.7276

1.007276

1.0007276

The value of Stefan is constant is:

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4.57 x 10^-8 m²k²

5.67 x10^-8 wm^-2k^-4

6.67x 10^-11 wm²k⁴

7.45 x 10^-9 m² wk³

An alternating voltage is given by 20 sin 157 t. Th efrequency of alternating voltage is:

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50 Hz

25Hz

100 Hz

75 Hz

The radioactive decay obeys the law

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The combined effect of resistance and reactance in circuit is called:

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Impedance

Inductance

Capacitance

None of above

If 10 A current passes through 100 mH inductor, then energy stored is.

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100 J

5 J

20 J

Zero

The numerical value of Compton wavelength is equal to

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3.43 x 10^-12 m

1.43 x 10^-12m

2.43 x 10^-12m

0.43 x 10^-12m

A charged conductor has charge on its.

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Inner surface

Outer surface

Middle surface

Surrounding space

Platinum wire becomes yellow at a temperature of.

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900^oC

1300^oC

1600^oC

500^oC

The main use of A.C is

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Minimum line losses

Long distance transmission

Stepping up to required voltage only

Steeping down to required voltage only

Example of ductile substance is.

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Glass

Wood

Lead

Oxygen

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