Electricity and Circuits
Electricity and Circuits, Conductors, Non-Conductors
Questions
Which of the following electricity supply wires protects from electric shock and electric fires?
- Live wire
- Neutral wire and live wire
- Earth wire
- Earth wire and neutral wire
- Live wire and earth wire
The source of electricity in a cell is the ___________ in it.
- copper wire
- mechanical energy
- chemical stored
- filament
- charge stored
Materials which allow the electric current to flow through them are called good electric conductors. Which of the following is not a good conductor of electricity?
- Copper
- Aluminium
- Rubber
- Gold
- Salt water
Consider the following statements:
- Battery is a combination of two or more electric cells
- Electric current is the flow of electricity in a filament
- Insulator is a material that does not allow a flow of electricity in a terminal
Choose the statements that are false:
- Battery is a combination of two or more electric cells.
- A bulb, in which the filament breaks, is called a fused electric bulb.
- The complete path from one terminal of an electric cell through the bulb and back to the other terminal is called open circuit.
- Both 1 and 2
- 2 and 3
- Only 3
- Both 1 and 3
- Only 2
High rise buildings use electric lifts. In electric lifts, electrical energy is converted into ___________ energy.
- mechanical
- light
- sound
- magnetic
- heat
Which of the following is a good conductor of electricity?
- Dry wood
- Plastic
- Ceramic
- Glass
- Nickel
Consider the following definition:
The complete path from one terminal of an electric cell through the bulb and back to the other terminal of the electric cell is called Electric Circuit.
Match the following:
| a. Conductors | 1. Ends of an electric cells |
| b. Graphite | 2. Which allow current to pass |
| c. Insulators | 3. Good conductor |
| d. Terminals | 4. Which do not allow the current to pass |
- a - 2, b - 3, c - 1, d - 4
- a - 2, b - 3, c - 4, d - 1
- a - 3, b - 2, c - 4, d - 1
- a - 2, b - 4, c - 3, d - 1
- a - 1, b - 3, c - 4, d - 2
Which of the following statements is false:
A. The electric energy which is supplied in our homes comes from electric power houses.
B. An electric bulb is a device which changes light energy into electric energy.
C. Electric current flows through a closed electric circuit.
D. Materials which do not allow electric current to flow through them are called insulators.
- Only a
- Only b
- Both a and c
- Only d
- Both b and d
Which of the following devices does not work on electricity?
- Television
- Windmill
- Fan
- Toaster
- Refrigerator
Electric current flows in the direction from __________ terminal in a circuit.
- negative to positive
- positive to negative
- negative to negative
- positive to positive
- positive to neutral
In an electric bulb, when electric current is passed through the filament, it gets white hot and produces light. This filament is made of _____________.
- copper
- iron
- aluminium
- tungsten
- zinc
Which of the following sequences of terminals in a battery is the correct sequence?
- Positive - negative - positive - negative - positive - negative
- Positive - positive - negative - negative - positive - negative
- Negative - negative - positive - positive - negative - positive
- Negative - positive - negative - positive - negative - positive
- Positive - positive - positive - negative - negative - negative
Match the following:
| 1. Light energy | a. Loud-speaker |
| 2. Sound energy | b. Electric motor |
| 3. Mechanical energy | c. Electromagnets |
| 4. Magnetic energy | d. Electric bulb |
- 1 - d, 2 - a, 3 - b, 4 - c
- 1 - d, 2 - a, 3 - c, 4 - b
- 1 - a, 2 - d, 3 - b, 4 - c
- 1 - c, 2 - a, 3 - b, 4 - d
- 1 - d, 2 - b, 3 - a, 4 - c
The electrical unit of voltage is __________.
- volts
- ampere
- joules
- watt
- ohm
Match the following:
| a. Resistor | 1. A non-metal that conducts electricity |
| b. Plug-key | 2. Obstructs the flow of current |
| c. Connector | 3. Used to join battery and terminals |
| d. Graphite | 4. Used to close and open the circuit |
- a - 2, b - 4, c - 3, d - 1
- a - 2, b - 4, c - 1, d - 3
- a - 4, b - 2, c - 3, d - 1
- a - 1, b - 4, c - 3, d - 2
- a - 2, b - 3, c - 4, d - 1