Insulating materials have the function of______________?

Related Mcqs:

1. Insulating materials have the function of___________?

   A. preventing a short circuit between conducting wires
   B. preventing an open circuit between the voltage source and the load
   C. conducting very large currents
   D. storing very high currents

2. Out of the following which is an insulating material____________?

   A. Copper
   B. Gold
   C. Silver
   D. Paper

3. The filament of an electric bulb is made of______________?

   A. carbon
   B. aluminium
   C. tungsten
   D. nickel

4. Which of the following materials has a negative temperature co-efficient of resistance?

   A. Copper
   B. Aluminum
   C. Carbon
   D. Brass

5. are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators______________?

   A. Varistors
   B. Thermistor
   C. Semi-conductors
   D. Variable resistors

6. Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 25 Q. If the same four wires are connected is series the effective resistance will be________?

   A. 100 Ω
   B. 200 Ω
   C. 300 Ω
   D. 400 Ω

7. Which one of the following does not have negative temperature co-efficient ____________?

   A. Aluminium
   B. Paper
   C. Rubber
   D. Mica

8. The minimum charge on an ion is______________?

   A. equal to the atomic number of the atom
   B. equal to the charge of an electron
   C. equal to the charge of the number of electrons in an atom (#) zero

9. Bulbs in street lighting are all connected in_____________?

   A. parallel
   B. series
   C. series-parallel
   D. end-to-end

10. A nichrome wire used as a heater coil has the resistance of 2 £2/m. For a heater of 1 kW at 200 V, the length of wire required will be_____________?

    A. 80 m
    B. 60 m
    C. 40 m
    D. 20 m