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

• 1. Varistors
• 2. Thermistor
• 3. Semi-conductors
• 4. Variable resistors

Question: All good conductors have high____________?

• 1. conductance
• 2. resistance
• 3. reluctance
• 4. thermal conductivity

Question: Voltage dependent resistors are usually made from________________?

• 1. Charcoal
• 2. Silicon Carbide
• 3. Nichrome
• 4. Graphite

Question: Voltage dependent resistors are used_____________?

• 1. for inductive circuits
• 2. to supress surges
• 3. as heating elements
• 4. as current stabilizers

Question: The ratio of mass of proton to that of electron is nearly_____________?

• 1. 1840
• 2. 1840
• 3. 30
• 4. 4

Question: The number of electrons in the outer most orbit of carbon atom is___________?

• 1. 3
• 2. 4
• 3. 6
• 4. 7

Question: With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals_____________?

• 1. 10 W
• 2. 20 W
• 3. 40 W
• 4. 60 W

Question: A thermistor has_____________?

• 1. positive temperature coefficient
• 2. negative temperature coefficient
• 3. zero temperature coefficient
• 4. variable temperature coefficient

Question: If/, R and t are the current, resistance and time respectively, then according to Joule’s law heat produced will be proportional to_______________?

• 1. I2Rt
• 2. I2Rf
• 3. I2R2t
• 4. I2R2t*

Question: Nichrome wire is an alloy of_____________?

• 1. lead and zinc
• 2. chromium and vanadium
• 3. nickel and chromium
• 4. copper and silver