311. A substance whose molecules consist of dissimilar atoms is called____________?
A. semi-conductor
B. super-conductor
C. compound
D. insulator
312. International ohm is defined in terms of the resistance of________________?
A. a column of mercury
B. a cube of carbon
C. a cube of copper
D. the unit length of wire
313. Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be_________________?
A. 9 times
B. 1/9 times
C. 1/3 times
D. 3 times
314. Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners ___________?
A. 3/2 Q
B. 6 Q
C. 4 Q
D. 8/3 Q
315. Which method can be used for absolute measurement of resistances _______________?
A. Lorentz method
B. Raleigh method
C. Ohm’s law method
D. Wheatstone bridge method
316. Ohm’s law is not applicable to__________?
A. semi-conductors
B. D. C. circuits
C. small resistors
D. high currents
317. Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be_____________?
A. 160 ohms
B. 80 ohms
C. 20 ohms
D. 10 ohms
318. 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
319. Temperature co-efficient of resistance is expressed in terms of___________?
A. ohms/°C
B. mhos/ohm°C
C. ohms/ohm°C
D. mhos/°C
320. When current flows through heater coil it glows but supply wiring does not glow because______________?
A. current through supply line flows at slower speed
B. supply wiring is covered with insulation layer
C. resistance of heater coil is more than the supply wires
D. supply wires are made of superior material
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