When the temperature of semiconductor suddenly drops zero kelvin, then a semiconductor acts as:
- Conductor
- Insulator
- Semi-conductor
- Super conductor
In transformer, there is no ___ connection between the two coils but they are ___ linked?
- Magnetic, electrically
- Electrical, optically
- Magnetic, magnetically
- Electrical, magnetically
Working principle of magnetic levitation train is according to?
- Max planks law
- Faraday law
- Ohm law
- Lenz law
The unit of ΔΦ / Δt can be written as ?
- NmA-2s1
- NmA-1s-1
- NmA-2s-1
- NmAs-1
The source of magnetic field us
- Nonmagnetic substance
- Static electric charge
- An isolated magnetic pole
- Current loop
Which surface has greater magnetic flux in same magnetic field, each has an area 1 m^2.
- Flux is independent of shape
- Circular
- Square
- Rectangular
The coulomb’s constant K depend upon:
- Nature of medium
- Types of charge
- System of units
- Nature of medium and system of units
The resistance of a conductor does not depend on which of the following?
- Mass
- Area
- Length
- Resistivity
How much potential drop exist across closed switch ?
- 2 V
- 1 V
- 3 V
- 0 V
The mechanical waves are not generated by
- Ropes
- Water
- Electric and magnetic fields
- Coil of spring
