The wire having red plastic covering is
Live wire
neutral wire
Earth wire
None
The potential difference between live wire and neutral wire in India is
110 V
50 V
220 V
The safety device to protect an electric circuit from overloading or short circuiting is
Earthing
Electric fuse
Magnetic induction
Electrolysis
Which of the following domestic appliance uses an electric motor?
Electric fan
Milk cooker
Pressure cooker
Cooking gas
The depletion layer in the PN junction region is caused by
Drift of holes
Diffusion charge carriers
Migration of impurity atoms
Drift of electrons
Commonly used safety fuse wire in made of
Copper
Pb
Ni
An alloy of tin & lead
choose the wrong statement
Magnetic poles exist in pairs
Magnetic poles have equal strength
like poles repel each other
Unlike poles repel each other
Choose correct statement about magnetic lines of force
Lines of force are not imaginary lines
Can not be mapped on paper
Do not intersect each other
Always intersect each other.
SI unit of magnetic field is
Tesla
Volt
Joule
Ampere
Which of the following device reverses the direction of flow of current through a circuit ?
Commutator
Rheostat
Ammeter
Voltmeter
