Domestic Electric Circuit

Q.

What is power of a body?

Q. If [(y/z)to the power a [(z/x)to the power b][(x/y) to the powerc]= 1, then prove that [(y/z)to the power 1/b-c] =[(z/x)to the power 1/c-a] = [(x/y)to the power 1/a-b]

Q. The sun angular diameter is measured to be 1920".the distance of the sun from the earth is 1.49610race to power 11 m. What is diameter of the sun?

Q.

Describe earth wire safety function.

Q. The value of stefans constant in cgs us 5.67 x 10 to the power 5 erg cm to the power -2 and k to the power -4 find its value in SI unit

Q. Five bulbs of eighty watt each two fans of hundred watt each an electric motor of three kilowatt and a geyser of five kilowatt are used for eight hours per day by a family. Calculate the total energy cosumed in thirty days and the cost of electricity used in one day at the rate of rupees five per unit.

Q. 1 watt = ___

1. 1 J/ hr
2. 1 J/ s
3. 1 kJ/ hr
4. 1 kJ/ min

Q.

Power is _______ of doing work with respect to time.

Q.

What is the unit of power?

Q.

What is immaterial for an electric fuse?

1. Its specific resistance

2. Its length

3. Its radius

4. Current flowing through it

Q.

The unit of power is watt per second.

1. True
2. False

Q.

One horse-power = ____ watt.

Q. The unit of electric power is___.

1. ampere
2. joule
3. volt
4. watt

Q.

– – ---- -----saves the user from electric shock

Q.

Power is a vector quantity.

1. True
2. False

Q. An electric bulb of 60 w (60watt) is used for 6 (six) hours per day. Calculate the unit of energy consumed in one day by bulb.

Q.

Why are the electric wires used in homes usually covered with materials like plastic or rubber?

1. To prevent rusting.

2. To make handling easier.

3. To insulate wires.

4. To make them look beautiful.

Q.

Which is the component that breaks the electric circuit in case of excess current?

1. Fuse wire

2. Voltmeter

3. Earth wire

4. Ammeter

Q. If an electric bulb, of rating 60 watts, is operated for 10 hrs everyday. The cost of electricity is charged as 8 rupees per unit. What is the cost of lighting the bulb for 1 month?

1. Rs 110
2. Rs 220
3. Rs 200
4. Rs 144

Q.

Define power.

Q.

Electric energy consumed at our homes is expressed as

1. Joule

2. Watt - sec

3. Watt-hour

4. Kilowatt - hour

Q.

Two bulbs of60watt each, three tube lights of 40watt each and two fans of80 watt each are used for 8hrs aday .Calculate the total amount of electrical energy conmused?

Q.

One Watt is equal to

1. $1J-s$

2. $1J-s^{-1}$

3. $3.6\times {10}^{6}J-s^{-1}$

4. $1000J-s^{-1}$

Q. explain any one problem based on commercial unit of energy?

Q.

What is the SI unit of power?

Q. Which of the following is a procedure for electrical safety?

1. switching
2. short circuiting
3. earthing
4. lighting

Q. All household components should be connected to ____ for safety.

1. electric poles
2. rubber
3. earth wire
4. antennas

Q. Which of the following is a procedure for electrical safety?

1. switching
2. short circuiting
3. earthing
4. lighting

Q. The difference in voltage of live and neutral wire in domestic circuits in India is about .

1. 240 volts
2. 440 volts
3. 220 volts
4. 330 volts