10th Class Physics MCQS Chapter 6

If the current in a wire which is placed perpendicular to a magnetic field increases, the force on the wire.

Increases

Decreases

Will be zero

Remains the same

The force on a current carrying conductor is maximum if angle between field and conductor is:

45^o

0^o

90^o

180^o

According to coulomb’s law, what happens to the attraction of two oppositely charged objects as their distance of separation increases:

Decreases

Increases

Cannot be determined

Remains unchanged

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

Electric motor

Solenoid

Transformer

A.C Generator

The standard group of bits in digital electronic is:

7 bits

8 bits

6 bits

5 bits

If the change of current in a circuit induces a current in another circuit, this phenomena is known as:

Self induction

None mutual induction

Mutual induction

Electromagnetic induction

What is the direction of the magnetic field lines inside a bar magnet?

There are no magnetic field lines.

From north pole to south pole

From south pole to north pole

From side to side

Which type of energy is converted into mechanical energy in the D.C. Motor.

Electrical energy

Magnetic energy

Heat energy

Chemical energy

The shape of magnetic lines of force in case of a straight current carrying conductor is:

Trangular

Rectangular

Circular

Eliptical

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

Focus

Axis

None of these

Line