Ohm’s Law Online Test – Multiple Choice Questions and Answers 1. A resistance of 5 ohms is further drawn so that its length becomes double. Its resistance will now be 5 ohms 7.5 ohms 10 ohms 20 ohms 2. The element of electric heater is made of nichrome copper steel carbon 3. The element of electric heater is made of carbon nichrome copper steel 4. The ratio of the resistance of a 100 W, 220 V lamp to that of a 100 W, 110 V lamp will be nearly 1 / 4 1 / 2 2 4 5. Which of the following has negative temperature coefficient ? Brass Silver Mercury Electrolytes 6. Specific resistance of a substance is measured in ohm-cm mhos ohms cm/ohm 7. Three equal resistors connected in series across a source of emf together dissipate 10 watts of power. What would be the power dissipated in the same resistors when they are connected in parallel across the same source of emf? 10 watts 30 watts 90 watts 270 watts 8. Four identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be 1 / 16 times 1 / 4 times 4 times 16 times 9. Which of the following bulbs will have the least resistance ? 115 V, 60 W 115 V, 100 W 220 V, 60 W 220 V, 100 W 10. The resistance of a 100 W, 200 V lamp is 100 ohm 200 ohm 400 ohm 1600 ohm Loading … Question 1 of 10
