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WorksheetsSCIENCE FORM 3 CHAPTER 6
Total questions: 50
Worksheet time: 26mins
What is the definition for renewable energy sources?
Energy sources that cannot be replaced and will deplete
Energy sources that can be replaced continually and will never deplete
All renewable resources cannot be used to keep the earth cleaner.
All renewable resources are bad for the environment.
Natural resources form in nature. Which of the following is NOT a natural resource?
Plastic
Oil
Coal
Water
A ________________ is a device used to generate electricity
oil
engine
battery
generator
How do wind turbines generate electricity?
The blades of the wind turbine are moved by the wind, which turns a generator inside it and generates electricity
The National Grid spins the turbines to transfer electricity to homes
Wind turbines do not generate electricity, they heat water
The blades spin to heat water, create steam, which turns a turbine, and produces electricity
Transformers on distribution poles .............. voltage for use in homes.
step up
step down
step right
step left
___________________ is generated at the electricity plant by the burning of fossil fuels
Solar energy
Water
A magnet
Steam
Examples of non-renewable energy are ______________ .
water and wind.
natural gas, coal and oil.
coal, natural gas and wind.
hydropower, solar and nuclear.
How is Electricity Generated?
By the use of turbines
by the use of sub stations
by the use of electricity
by the use of transmission lines
How do Solar power plant produce electricity?
the sunlight turns the turbines
the steam from the sunlight rotates the turbines
it doesn't happen at all.
the solar panels collect the lights coming from the sun.
How does the powerplant produce electricity?
the thunder hit the transmission line and it produce electricity
the water flows and produce steam to turn the turbines and generate electricity
the substation generate the electricity
none of the above
The two types of current are ______________ and _______________ .
Alternating Current
Fluctuating current
Floating current
Direct Current
An electric current that continually reverses direction over time is known as a(n)
fluctuating current
direct current
alternating current
simple current
Electric currents passing through wires will produce a(n)
magnet
insulator
solenoid
magnetic field
A device that uses an electromagnet to measure electric current is a(n) _______________ .
commutator
generator
galvanometer
electric motor
A transformer consists of
Metal Core
Metal core and polymer wire
Metal core and coiled wire
Polymer core and metal wire
Transformer is device that ________________
converts AC voltage to current
converts electrical energy to kinetic energy
converts AC voltage to a different level at the same amplitude
converts AC voltage to a different level at the same frequency
Is the core insulated?
Yes
No
Step-up transformer is a transformer that increases ______________
voltage.
current.
resistance.
conductance.
The function of a transformer is to _____________
raise and lower the apparent power levels
increase or decrease A.C voltage or A.C current levels
transfer DC voltage from the primary winding to the secondary winding
transform mechanical energy into electrical energy
Choose the correct statement:
The ratio of the secondary voltage to the primary voltage is equal to the ratio of the primary turn to the secondary turn
The ratio of the primary current to the secondary current is equal to the ratio of the primary voltage to the secondary voltage
The ratio of the primary apparent power to the secondary apparent power is equal to the ration of the primary voltage to the secondary voltage
The ratio of the secondary current to the primary current is equal to the ratio of the primary turn to the secondary turn
Assume primary has 240 turns and secondary has 60 turns. Primary is connected with 120 V AC power supply. What is the voltage on the secondary?
2 V
30 V
0.333 V
120 V
This picture is an example of a ___________
Step- Up Transformer
Step- Down Transformer
Step- Right Transformer
Step- Left Transformer
The flowchart shows the sequence of the components in the electricity transmission and distribution system.
Power station -----> _____________ -----> National Grid Network ----> Main substation ----> _____________ ----> _____________ ----> Branch substation ----> Step-down transformer
Switch zone, step-up transformer, step-down transformer
Switch zone, step-down transformer, step-up transformer
Step-up transformer, switch zone, step-down transformer
Step-up transformer, step-down transformer, switch zone
The voltage of alternating current, a.c., is ___________ before it is transmitted through the National Grid Network.
increased
decreased
The _______ enables electricity to be transmitted to the branch substation when needed
Switch zone
National Grid Network
Transformer
Power station
2-pin plugs are not connected to the earth wire.
True
False
Mei Ling got an electric shock while ironing her clothes. The following information shows the steps taken by his brother to help her.
P- Calls an ambulance
Q- Remove electrical source using an insulator
R- Switches off the main power supply
S- Perform mouth to mouth resuscitation if the victim is not breathing.
Which sequence is correct?
P, R, Q, S
R, Q, S, P
P, Q, R, S
R, Q, P, S
___________ disconnects the current supply temporarily when it is not needed (such as during repairing damaged wiring).
ELCB circuit breaker
Main switch
MCB circuit breaker
Electric meter
___________ cuts off the current supply in the house when excessive current flows through it.
ELCB circuit breaker
Main switch
MCB circuit breaker
Electric meter
___________ separates the final circuit into the other parts of electrical equipment like air conditioner circuit and controls the quantity of current flows through it.
ELCB circuit breaker
Main switch
MCB circuit breaker
Electric meter
The main supply of electrical energy in a house has a voltage of
33 kV
240 V
415 V
621 V
If an electrical appliance uses current of 11 A, which is the suitable value of fuse to be used.
15 A
10 A
5 A
13 A
Why is alternating current used instead of direct current in the transmission of electricity through long distances?
Only alternating current can flow through the cables.
Alternating current voltage can be stepped up or stepped down by using transformers.
Most of the electrical appliances work only with alternating current.
Generating direct current is more complicated than generating alternating current.
What is the function of live wire?
To carry electrical current from electrical appliance to substation
To carry leaked current to the ground
To carry electrical current from station to electrical appliance
melts when the current flowing through it exceeds the value of the fuse.
Which of the following uses single - phase wiring?
Industrial area
Shopping mall
Hotel
Homestay
What is the function of the National Grid Network?
Transmit electrical energy all over the country through high voltage cable network
Store voltage for emergency use
Collect and channel the electrical energy to the consumers
Lower the value of voltage to suit the supplied area
This car needs 8600J of energy to power it. If 5000J is changed into useful energy, how much energy is wasted?
13600J
3600J
5000J
8600J
What is the efficiency of the machine if the input is 263 J and the output is 142 J?
6.26%
185%
260%
54%
What is the work output of a machine that has a work input of 2,800 Joules and an efficiency of 92.3%?
2,690 J
0.0082 J
92.3 J
2,584.4 J
Lucas has been challenged to increase the efficiency of a device he is redesigning. His goal is 90% efficiency. The work input of the device is fixed at 10 joules, so Lucas is trying to improve work output. How many joules of work output should Lucas aim for to attain his goal of 90% efficiency?
9 Joules
0.9 Joules
900 Joules
90 Joules
Which of the following energy transformations occur when a lamp that is plugged into a wall socket is functioning correctly?
Chemical to light
Electrical to light
Electrical to chemical
Chemical to electrical
Which of the following are advantages of 3 phase power as apposed to single phase?
Cheaper installation as less copper needed for same power transmission
3 voltages are available, a line, phase and live voltage
2 voltages are available, a line and a phase voltage
Almost constant power delivery as opposed to pulsating power in single phase can reduce vibration in motors
The voltage is faster in a 3 phase system due to the power transmission
Tick some of the safety components in the Wiring System in Homes
Switch
Generator
ELCB
MCB
Socket
The diagram shows how electrical energy is produced.
What does Q represent?
The water is heated until steam is produced and the turbine is rotated.
The water rotates a motor, which will then rotate a generator.
A mixture of steam and gas is heated until they expand and the turbine is generated.
The water rotates a turbine, which will then rotate a generator.
The diagram shows four transformers, A, B, C and D.
Which transformer is a step - up transformer?
A
B
C
D
Where does the electric power voltage begin to be lowered in the electricity transmission and distribution system?
Substation
National power grid
Switch field
Main substation
An electric iron is rated 1050 W, 240 V.
Which of the following is a suitable fuse rating for the iron?
1 A
2 A
3 A
5 A
Which of the following is a problem related to electricity supply in life?
Our country is more dependent on non-renewable energy sources such as petroleum
Inefficient and ineffective use of electricity among the citizen
Malaysia Awareness on saving electricity is still low among Malaysians
Malaysia sells electricity to neighbouring countries to generate the economy
Diagram shows the electricity transmission and distribution system.
P shown is a transformer station.
Voltage that is supplied by Q is 11 kV. What is represented by Q?
Heavy industrial zone
Free commercial zone
Food processing factories
Municipal area
An electric iron is rated 1050 W, 240 V.
Which of the following is a suitable fuse rating for the iron?
1 A
2 A
3 A
5 A
