## Q1 Which law define the heat produced by an electrical appliance?

• (a) Coulomb’s Law
• (b) Kirchhoff’s law
• (c) Gauss Law
• (d) Joule’s law of heating

• (d) Joule’s law of heating

## Q2 kWh is the unit of:

• (a) Charge
• (b) Power
• (c) Electrical Energy
• (d) None

• (c) Electrical Energy

## Q3  How much heat will be produced by a heater of 1200W in 1 minute?

• (a) 72000J
• (b) 52000J
• (c) 1200J
• (d) 12000J

• (a) 72000J
Use the formula H= I^{2}Rt

## Q4 How much current will be drawn by a motor of 5hp. from 220Vsupply?

• (a) 18.8A
• (b) 16.95A
• (c) 5A
• (d) 20.7A

• (b) 16.95A
Use the formula of Power P =V/I
1 hp = 746Watt

## Q5 Three bulbs 40W, 60W and 100W are connected in parallel and given 220V supply. Which bulb will draw more current?

• (a) 40W bulb
• (b) 60W bulb
• (c) 100W bulb
• (d) None

• b) 100W bulb

• a) True
• b) False

• b) False

## Q7 Joule is the commercial unit of electrical power. (T/F)

• a) True
• b) False

• b) False
The commercial unit of power is Horse Power

## Q8 The commercial unit of electric energy is ------------.

• (a) Watt
• (b) Joule
• (c) KWh
• (d) None of these

• (c) kWh

## Q9. which of the following is true about heating elements in heaters

• a) have low resistivity and low melting point
• b) have high resistivity and high melting point
• c) have low resistivity and high melting point
• d) have high resistivity and low melting point

• b) have high resistivity and high melting point

• (a) 20W
• (b) 60W
• (c) 80W
• (d) 100W

• (a) 20W