CURRENT ELECTRICITY PART 1

CURRENT ELECTRICITY PART 1

1.The flow of current in solid is due to

a.electrons 

b.electrons and ions

c.Atoms 

d.nucleus

2.Drift velocity of Electronics is..

a.Very small as compare to speed of light

b. to speed of light 

c.almost equal to speed of light

d.Greater than speed of light

3.The resistance of human body is around

A. 1000 ohm

b.5 ohm

c.25 ohm

d.250 ohm

4.One commercial unit of energy equals 

a.500 Watt second 

b.1 watt hour

c. 1 kilowatt hour

d.10 kilowatt hour

5.one columb charge equals the charge on

a.6.24×10^12 electrons

b.6.24×10^14 electrons

c.6.24×10^16 electrons

d.6.24×10^18 electrons

6.The electrical energy required to heat a bucket of water to a certain temperature is 4 kw.If the heat losses are 20℅ percent ths energy input is

a. 2kwh

b.3.2 kwh

c.5 kwh

d.3.2 kwh

7.In gasses the flow of current is due to 

a.electrones

b.positive ions

c.electrones and positive ions

d.electrones positive ions and negetive 

8.The maximum current rating for a 10 kilo ohm 0.5 watt resistor is

a.0.707mA

b.7.07mA

c.14.14mA

d.28.28mA

9.An electrical lamp consumes 100 watt of power.If the supply voltage is 220  volt the energy consumed in 30 minute is

a.0.005 kwh

b.0.05 kwh

c.0.5 kwh

d.5 kwh

10.THE SI UNIT OF POWER IS

a.watt

b.henry

c coulumb

d.watt-hour

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Answers:-1.a 2.a 3.a 4.c 5.d 6.c 7.d 8.b 9.b 10.a