Question # 1

When an electric current passes through a conductor, which field is produced around it?

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Electric field

Magnetic field

Gravitational field

Electrostatic field

Changing magnetic field in a closed circuit can induce:

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e.m.f

Electric current

Force

Both A and B

J.J Thomson observed deflection of cathode rays in:

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1895

1896

1897

1998

Which is the most suitable means of reliable continuous communication between an orbiting satellite and Earth?

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Microwaves

Radio waves

Sound wave

any light waves

SI unit of electric potential is:

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Watt

Volt

Coulomb

Joule

Which gate is used for safety alarm:

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AND

NANAD

OR

NOR

The speed of sound in air at 21 °C is:

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336ms^-1

343ms^-1

430ms^-1

470ms^-1

Optical fibre are:

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Cheap

Flexible

Lighter

All of these

Capacitance is defined as:

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VC

Q/V

QV

V/Q

the range of galvanometer to measure current is:

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few amperes

few micro amperes

few milli amperes

mega amperes

In a convex mirror the size of the image:

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Is smaller than the size of the object

Is greater than the size of the object

Depends upon the position of the object

Is equal to the size of the object

If the mass of the bob of a pendulum is increased by a factor of 3, the period of the pendulum’s motion will:

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Be increased by a factor of 2

Remain the same

Be decreased by a factor of 2

Be decreased by factor of 4

An object gains excess negative charge after being rubbed against another object, which is:

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Neutral

Negatively charged

Positively charged

Either, a, b or c

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