Basic Electricity Quiz 1

1. Resistance of a material not depending on
    A. Length
    B. Cross-section
    C. Density
    D. None of these

2. The resistance between the opposite faces of a meter cube of a material is called
    A. Resistivity  
    B. Temperature coefficient
    C. Conductance
    D. None of these

3. Which of the following is not a characteristic of a parallel circuit?
    A. Branch currents are additive
    B. Powers are additive
    C. Conductances are additive
    D. Voltages are additive

4. Voltage across a short circuit will be
    A. Infinity
    B. Zero
    C. Unity
    D. None of these

   

5. Two resistors of 10 ohm each are connected in series across a 10 V supply. What will be voltage across each resistors
    A. 0 V
    B. 10 V
    C. 5 V
    D. 20 V

   

6. Which of the following material has nearly zero temperature coefficient
    A. Carbon
    B. Copper
    C. Manganin
    D. Aluminiun

   

7. Which of the following statement is true both for a series and parallel dc circuit?

    A. Branch currents are additive
    B. Powers are additive
    C. Conductances are additive
    D. Voltages are additive

   

8. A coil has a resistance of 100 ohm at 90⁰C and at 100⁰C resistance is 101 ohm. The temperature coefficient of the wire at 90⁰C is
    A.  0.01
    B. 0.1
    C. 0.0001
    D. 0.001

  

9. You have to replace a 1500-ohm in a circuit. But have no 1500-ohm resistor but have several 1000 ohms, which you would connect?
    A. Three in parallel
    B. Three in series
    C. Two in parallel
    D. Two in parallel and one series

10. Two wires A and B have same cross-section made of same material. Ra = 600 ohm, Rb = 100 ohm. The number of times A is longer than B is
    A. 6
    B. 2
    C. 4
    D. 1/6

11. Three 10 ohm resistors are connected in delta. If this is transformed to a star what will be the resistance of each branch?
    A. 10 Ohm
    B. 10/2 Ohm
    C. 10/3 Ohm
    D. 30 Ohm

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12. Kirchhoff’s current law is applicable to only     A. Closed loops in network
    B. Junctions in a network
    C. Electronic circuits
    D. Electric circuits

13. KVL is concerned with
    A. IR drops
    B. Battery emf
    C. Junction volt
    D. Both A & B

14. The algebraic sign of an IR drop is primarily dependent on the
    A. Amount of current flowing through it
    B. Value of R
    C. Direction of flow of current
    D. Battery connection

15. The following formula is used to calculate the total resistance R of a parallel circuit?
    A. R=R1*R2*…Rn/(R1+R2+…Rn)
    B. R=1/R1+1/R2+…1/Rn
    C. 1/R=1/R1+1/R2+…1/Rn
    D. R=R1+R2+….Rn

16. What is the formula for Ohm’s law?
    A. V=I+R
    B. I=V*R
    C. V=I/R
    D. I=V/R

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17.The resistance of a wire will double if we double the
    A. Area
    B. Temperature
    C. Length
    D. Weight

18. A voltage of 100 V is applied to a circuit of resistance of 10 ohms, the power the dissipated by the resistance will be
    A. 100 Watts
    B. 500  Watts
    C. 1000 Watts
    D. 1500 Watts

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19. Power taken by a resistance of 20 ohms with a flow of 10 A current is
    A. 1kW
    B. 1.5kW
    C. 2.5kW
    D. 2kW

20. When the high resistance is connected in parallel with a low resistance, the combined resistance is
    A. Higher than the lower resistance
    B. Lower than the higher resistance
    C. Between the value of high and low resistance
    D. Less than the lower resistance