Question # 1

A charged particle having charge 'q' is moving at right angle to magnetic field. The quantity which varies is.

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Speed

Kinetic energy

Path of motion

angular velocity

Two parallel wires carrying currents in the opposite direction.

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Repel each other

Attract each other

Have no effect upon each other

They cancel out their individual magnetic fields.

The acceleration of an electron of mass m and charge e, moving with uniform speed v at right angles to a magnetic field of flux density B, is given by

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Bevm

The torque in the coil can be increased by increasing:

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No. of turns

Current and magnetic field

Area of coil

All of the above

The magnetic flux will be max, For an angle of:

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0°

60°

90°

180°

Magnetic flux density is measured in

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Weber

Weber/m2

Tesla -m

Gauss

For a current carrying solenoid the term 'n' has unit as.

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No unit

m^-1

m^-2

m-3

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

The e/m of a neutron is

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Less than electron

The same as electron

Zero

Greater than election

In CRO, the output waveform of time base generator is

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Circular

Square

Sinusoidal

Saw-toothed

e/m=

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v/Br

Br/V

VB/r

Vr/B

If the length of solenoid is doubled but N same, B inside the solenoid becomes.

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Half

Doubled

One fourth

Four times

The sum of electric and magnetic force is called.

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Maxwell force

Lorentz force

Newton's force

Centripetal force

The brightness of the spot of CRO screen is controlled by.

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Anode

Cathode

Grid

Deflecting plates

A dot represents the direction of magnetic field.

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Out of page

Into the page

Tangent to page

Parallels to page

Galvanometer is sensitive when C/BAN is

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zero

Large

small

Negative

The value of e/m is smallest for

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Proton

Electron

Beta particle

Positron

For accurate measurement of current through a circuit, the resistance of ammeter should be

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Very small

Very high

Neither small nor high

None of the above

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Physics ICS Part 2 Chapter 14 Online MCQ's Test MCQs With Answers

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