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Worksheets2020 Y9 LC2 MCQ
Total questions: 60
Worksheet time: 38mins
A cyclist at the top of a hill has...
Kinetic Energy
Chemical Potential Energy
Elastic Potential Energy
Gravitational Potential Energy
A hot drink has...
Kinetic Energy
Heat Energy
Thermal Energy
Nuclear Energy
What is the equation for calculating gravitational potential energy
mv
1/2 mv^2
mgh
Ft
What energy transfers are shown in this picture?
Electrical from the outlet to the I-phone.
Thermal from the hand to the I-phone.
Thermal from the hand to the air.
Chemical from the outlet to the battery.
When the kid hits the ball, energy is transferred from the bat to the ball. What energy gets transferred to the bat?
Mechanical energy from the ball.
Mechanical energy from the boy.
Chemical energy from the boy.
Sound energy from the ball.
The Law of Conservation of Energy states:
Energy can created or destroyed but not transformed
Energy cannot be created or destroyed, it can only transformed
Energy can't be created, destroyed or transformed
Energy cannot be created or destroyed.
If the 0.3 kg marble was moving at 6 m/s at the bottom of the ramp, how much kinetic energy did the marble have?
5.4 J
1.8 J
3 J
6 J
A rollercoaster has 3.2MJ of GPE at the top of a dip, when it reaches the bottom of the slope it has 2190kJ of Kinetic Energy. What is the efficiency of this drop?
(a)
A lightbulb which has a 65% efficiency outputs 1755J of light energy in 45s. What is the power rating of the lightbulb?
(a)
A human being only has the ability to transfer 25% of the chemical energy it consumes into mechanical energy of the muscles. Which of the following is NOT a way the human body transfers energy that isn't related to motion?
Thermal
Chemical
Elastic
Electrical
Which two of the following energy transfers are wasteful for a van.
Chemical -> Thermal
Chemical -> Kinetic
Chemical -> Electrical
Chemical -> Sound
Solar panels in the UK receive much fewer hours of sunlight over the course of a year when compared to solar panels in Spain. What effect will this have on the UK panel's efficiency and power output?
Efficiency Decrease, Power Decrease
Efficiency Increase, Power Decrease
Efficiency Unchanged, Power Decrease
Efficiency Increase, Power Increase
Efficiency Increase, Power Decrease
The jug of this soup blender is made of plastic which has a low thermal conductivity. Why is this an advantage?
Higher rate of energy transfer
Lower rate of energy transfer
Prevents the formation of convection currents
Allows the formation of convection currents
What are the benefits of having a clean, rust-free and well lubricated bike chain? (Select all which apply)
Reduces Efficiency
Less Energy Wasted
Less Frictional Forces
Reduces Power Output
Which of these lightbulbs is cheapest to operate for a year? (Tap the image to enlarge)
Conventional Incandescent
Halogen Incandesecent
Compact Fluorescent
Light Emitting Diode
Look at this table. How many of kg of CO2 could a refrigerator potentially save?
(a)
Look at this table. Which of the following combinations would save them the most money?
Fridge freezer and Washing machine
Dishwasher, Digital TV and Washing Machine
Fridge freezer and Chest freezer
Chest Freezer and Dishwasher
Current is defined as the rate of flow of...
(a)
Select the unit of Electrical Charge with the correct shorthand
Amperes, A
Amperes, I
Coulombs, C
Coulombs, Q
Select the unit for Potential Difference with the correct shorthand
Amperes, A
Amperes, I
Volts, V
Voltage, V
What does a measurement of 30mA represent?
Current reading of 30,000 Amps
Current reading of 0.3 Amps
Current reading of 0.03 Amps
Current reading of 300 Amps
Select the correct definition for potential difference
The difference in electrical charge between two points in a circuit
The difference in electrical potential energy between two points in a circuit
The amount of energy the battery can store
The amount of voltage that is dissipated in a wire due to resistance and heating
Select all of the following components that are non-ohmic.
Lamp
Thermistor at a fixed temperature
Wire
Light Emitting Diode
Ohm's Law states that
Potential Difference =
Current / Resistance
Current x Resistance
Charge / Resistance
Charge x Resistance
Select all of the correct power equations.
Power = Current2 x Resistance
Power = Current x Potential Difference
Power = Potential Difference2 / Resistance
Power = Energy Transferred / Time
What component would produce an I/V graph that looks like this?
Diode
Light Dependent Resistor (LDR)
Wire
Fuse
In parallel circuits...
the current is the same everywhere.
the current splits at a junction.
the voltage is the same everywhere.
the voltage splits at a junction.
What device do we use to measure potential difference and how do we connect it?
Ammeter connected in series
Ammeter connected in parallel
Voltmeter connected in series
Voltmeter connected in parallel
How many junctions does this parallel circuit have?
8
6
4
2
What component could you add to a circuit to allow the resistance to change dependent on the level of light?
Variable Resistor
LDR
LED
Lumoresistor
What is the reading on the labelled ammeter?
(a)
What is the missing value on the voltmeter?
(a)
What is the missing value on the ammeter?
(a)
What is the reading on the voltmeter around the cell?
(a)
Potential difference = Current x Resistance.
Calculate the potential difference across a 20 Ohms resistor with 3 Amps of current running through it.
23V
60V
0.15V
6.7V
Power = Current x Potential Difference.
Calculate the power of a loudspeaker which operates with 1.5A of current and 8V of potential difference.
12W
12J
5.3W
5.3J
If the battery produced 12.6 Volts what would be the current flow for a 6 Ohm resistor?
2.1 Amps
2.4 Amps
1.71 Amps
15 Amps
A 3kW electric heater is powered by main electricity of 230V. Calculate how much current it draws.
13A
0.013A
690A
690000A
How long will it take to charge an iPad on 25% battery to fully charge if it draws 3.2A of current from a usb plug. Full battery of an iPad = 42000C.
2hr 17mins
3hr 39mins
0hr 55mins
2hr 44mins
A thermistor is connected to a series circuit containing a 0.8W LED and a 4V cell. The circuit turns on the LED when a current of at least 0.32A flows. What is the minimum temperature that will turn on the LED?
40
60
80
100
120
What is the energy transferred by a 3V watch battery when 4.2C of charge flows through it?
1.2 J
12.6 J
1.4 J
7.2 J
What is the potential difference across the 50 Ohm resistor when a current of 40mA flows?
1.0V
2.0V
3.0V
4.0V
What needs to be done to fix this circuit?
One of the cells needs to be reversed
The battery is not the right way round
There needs to be a switch added
They haven't labelled the components
Which of the following statements are advantages of an LED compared to a traditional filament lamp?
Requires less power to operate
Only allows current to flow in one direction
Has a much higher resistance
Higher relative luminosity
A small motor requires a potential difference of 1.25V to operate effectively. Calculate the potential difference a quadcopter's battery would need to output if all the motors are connected in series.
1.25V
2.50V
3.75V
5V
After 0.02s the resistance of the light bulb increases. Which of the following statements is incorrect about why its resistance increases.
Metal ions vibrate faster
More collisions between electrons and metal ions
Temperature has increased
More electrons travelling through the wire
How much charge flows through this component before it becomes a non-ohmic conductor?
0.24C
0.07C
175C
12.1C
Select all of the control variables for this experiment which is investigating how the temperature affects the resistance of a thermistor.
Same Thermistor
Temperature of the Water
Potential Difference of the Thermistor
Potential Difference of the Power Supply
Brightness increases
Brightness decreases
Brightness doesn't change
What is the main source of error when measuring the resistance of a length of wire
Misreading the ammeter
Misreading the voltmeter
Leaving the practical turned on
Human error
PS5 design includes a large fan to circulate cool air through the mechanism. Why is it important for the efficiency of PS5 to circulate cool air
Prevents the platic casing from melting
Lowers the resistance of components
Increases the frames per second output
Allows it to draw larger amounts of power
At which length in cm for this wire is there an anomalous result for the resistance measurement?
30.0
40.0
50.0
60.0
70.0
Select all the reasons why the large power source would be best for a student to use in school.
5 times more charge than the compact
Half the mass of the high capacity
Half the number of charges than the high capacity
Cheaper than the high capacity
