Question # 1

If current is flowing from bottom end to the top end in a wire, according to right hand rule the direction of line of forces would be:

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Anti-clock wise

Clock wise

Left and Right

Along the conductor.

In NOT gate number of input terminals is/are:

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1

2

3

4

Which statement is true about the magnetic poles?

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Unlike poles repel

Like poles attract

Magnetic poles do not effect each other

A single magnetic pole does not exist

The line which passes through pole of the mirror and center of curvature is called principal:

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Axis

Focus

Line

None of these

Which device is used to increases / decreases A.C Voltage?

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Electric motor

Transformer

A.C Generator

Solenoid

The number of lines of force in a magnetic field depends upon.

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Shape of coil

Sixe of coil

Magnet

Strength of field

Bouncing back of light after striking the surface is called:

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Refraction

Reflection

Diffraction

Interference

Changing magnetic field in a closed circuit can induce:

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e.m.f

Electric current

Force

Both A and B

When a current carrying conductor is placed in magnetic field at right angle to it. The direction of force acting upon it is:

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The same as direction of field

Opposite the direction of field

Makes an angle of 45^owith the current

At right angle to both the field and the current.

The magnetic field of a solenoid resembles as:

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Iron wire

U-shape magnet

Bar magnet

Point charge.

Transformer Works on the principle of:

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Self induction

Mutual induction

Electro statatic

Induction

Iron core is used in tranformer to:

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Enhance the flux

Decrease the flux

Keep flux the same

botha a and b

A transformer has 100 turns in its primary and 500 turns in secondary coil. If 6 volts D.C is applied across its primary, the voltage induced across its secondary coil will be:

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0 volt

30 volts

45 volts

60 volts

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Physics 10th Class English Medium Unit 6 Online Test MCQs With Answers

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