Question: A field of force can exist only between_____________?

• 1. two molecules
• 2. two ions
• 3. two atoms
• 4. two metal particles

Question: A substance whose molecules consist of dissimilar atoms is called____________?

• 1. semi-conductor
• 2. super-conducto
• 3. compound
• 4. insulator

Question: International ohm is defined in terms of the resistance of________________?

• 1. a column of mercury
• 2. a cube of carbon
• 3. a cube of copper
• 4. the unit length of wire

Question: Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be_________________?

• 1. 9 times
• 2. 1/9 times
• 3. 1/3 times
• 4. 3 times

Question: Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners ___________?

• 1. 3/2 Q
• 2. 6 Q
• 3. 4 Q
• 4. 8/3 Q

Question: Which method can be used for absolute measurement of resistances _______________?

• 1. Lorentz method
• 2. Releigh method
• 3. Ohm’s law method
• 4. Wheatstone bridge method

Question: Ohm’s law is not applicable to__________?

• 1. semi-conductors
• 2. DC circuits
• 3. small resistors
• 4. high currents

Question: 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_____________?

• 1. 160 ohms
• 2. 80 ohms
• 3. 20 ohms
• 4. 10 ohms

Question: 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_____________?

• 1. 80 m
• 2. 60 m
• 3. 40 m
• 4. 20 m

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

• 1. ohms/°C
• 2. mhos/ohm°C
• 3. ohms/ohm°C
• 4. mhos/°C