Sec 3 SET Revision 1

Which of the following is an example of electric shock by direct contact?

• Touching a faulty electrical appliance

• Touching an exposed wire

• Touching a live wire in normal condition

• Touching a metal casing that is in contact with live wire

What is the first thing to do when you see a person in electric shock?

• Take a photo of the person

• Switch off the electrical power

• Use a metal pole to move the person away from electrical appliance

• Call an ambulance

What is the smallest current passing through a human body that could lead to death?

• 5 mA

• 50 mA

• 500 mA

• 5 A

Which of the following does NOT affect severity of electric shock?

• The temperature of the electrical appliance

• The amount of current flowing through the body

• The length of time current flowing through the body

• The pathway through which the current flows in the body

What is emf?

• Electro motion force

• Electro movement force

• Electro moving force

• Electro motive force

What is the symbol and unit of current?

• Symbol is C

  Unit is A

• Symbol is I

  Unit is C

• Symbol is I

  Unit is A

• Symbol is A

  Unit is I

What does voltmeter measure and how is it connected to the electrical circuit?

• Measure current and connected in parallel

• Measure current and connected in series

• Measure voltage and connected in series

• Measure voltage and connected in parallel

What is the reading shown?

• 0.21 A

• 0.22 A

• 0.23 A

• 0.24 A

How should resistance be measured?

• By connecting ohmmeter in series and power is switched on

• By connecting ohmmeter in parallel and power is switched on

• By connecting ohmmeter in series and power is switched off

• By connecting ohmmeter in parallel and power is switched off

Calculate the voltage across 2 ohm resistor if current flowing is 0.4 A.

• 0.8 V

• 0.2 V

• 5 V

• 2.4 V