Basic Electrical Mcqs

Temperature co-efficient of resistance is expressed in terms of___________?

A. ohms/°C
B. mhos/ohm°C
C. ohms/ohm°C
D. mhos/°C

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

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

Ohm’s law is not applicable to__________?

A. semi-conductors
B. D. C. circuits
C. small resistors
D. high currents

Which method can be used for absolute measurement of resistances _______________?A. Lorentz method
B. Releigh method
C. Ohm’s law method
D. Wheatstone bridge method

 

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

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

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

A substance whose molecules consist of dissimilar atoms is called____________?

A. semi-conductor
B. super-conducto
C. compound
D. insulator

A field of force can exist only between_____________?

A. two molecules
B. two ions
C. two atoms
D. two metal particles