# Electrical Engineering- Electric Current and Ohm's Law

##### Electrical Engineering- Electric Current and Ohm's Law

**1.**

1. Resistivity of a wire depends on

- length
- material
- cross section area
- none of the above.

**2.**

When n resistances each of value r are connected in parallel, then resultant resistance is x. When these n resistances are connected in series, total resistance is

- nx
- rnx
- x / n
- n2 x.

**3.**

Resistance of a wire is r ohms. The wire is stretched to double its length, then its resistance in ohms is

- r / 2
- 4 r
- 2 r
- r / 4.

**4.**

Kirchhoff's second law is based on law of conservation of

- charge
- energy
- momentum
- mass.

**5.**

The diameter of the nucleus of an atom is of the order of

- 10 -31 m
- 10 -25 m
- 10 -21 m
- 10 -14m

**6.**

The mass of proton is roughly how many times the mass of an electron?

- 184,000
- 184,00
- 1840
- 184.

**7.**

The charge on an electron is known to be 1.6 x 10-19 coulomb. In a circuit the current flowing is 1 A. How many electrons will be flowing through the circuit in a second?

- 1.6 x 1019
- 1.6 x 10-19
- 0.625 x 1019
- 0.625 x 1012.

**8.**

Two bulbs marked 200 watt-250 volts and 100 watt-250 volts are joined in series to 250 volts supply. Power consumed in circuit is

- 33 watt
- 67 watt
- 100 watt
- 300 watt.

**10.**

Which of the following is not the same as watt?

- joule/sec
- amperes/volt
- amperes x volts
- ( amperes )2 x ohm.