10th Class Physics MCQS
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:
45o
0o
90o
180o
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
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