Q.21)-When number of turns in a coil are made thrice without any change in the length of coil, then what will be its self inductance?
- Three times
- Nine times
- Six times
- One-third
Q.22)-If a wire of Resistance 'R' is melted and recast to half of its length, then the new resistance of the wire will be
- R/4
- R/2
- R
- 2R
Q.23)-During electro refining, Pure metal is collected at
- Anode
- Cathode
- Container
- Electrolyte
Q.24)-Which of the following is an electrolytic conductor
- Iron
- Gas carbon
- Copper sulphate
- Mercury
Q.25)-Which of the folloiwng is best conductor of electricity?
- Copper
- Iron
- Aluminium
- Silver
Q.26)-During the conduction of current, conductor becomes
- Positively charged
- Negatively charged
- Electrically neutral
- Alternatively positively and negatively charged
Q.27)-Current carrying conductor is related to
- Magnetic field
- Electric fielf
- Electro magnetic field
- Electrostatic field
Q.28)-A conducting wire is
- Positively charged
- Negatively charged
- Neutral
- Charged depending upon the power of current
Q.29)-The process of connecting of wires is called
- Cantenation
- Combination
- Cohesion
- Addition
Q.30)-In the resistance color code, the fourth band signifies
- Tolerance level
- Power of ten
- Total value of resistance
- The material of the resistor
