OCR GCSE Combined Science
Topic questions Physical quantities and units Physical quantities and units
13 questions · 39 marks · about 45 minutes
A radio wave has a wavelength of 5.0 m.
A second radio wave has a wavelength which is a thousand times greater.
What is the wavelength of the second radio wave?
A 0.005 m
B 5.0 m
C 125 m
D 5000 m
A student calculates that the energy used to make steel for a car is 1 260 000 000 J.
Which of these is equal to 1 260 000 000 J?
A 1260 GJ
B 1260 kJ
C 1260 MJ
D 1260 nJ
A student calculates that the energy used to make steel for a car is 1 260 000 000 J.
Which of these is equal to 1 260 000 000 J?
A 1260 GJ
B 1260 kJ
C 1260 MJ
D 1260 nJ
This question is about how electricity is generated.
A student writes down advantages and disadvantages of wind turbines.
| Advantage | Disadvantage | ||
| A | do not need fuel | C | do not produce carbon dioxide |
| B | produce renewable energy | D | take up lots of land |
The student has made one mistake.
State the letter of the statement that is in the wrong place.
The student writes down a list of renewable and non‑renewable energy sources.
| Renewable | Non‑renewable |
| hydroelectric solar | coal wave |
The student has made one mistake.
State the name of the energy source that is in the wrong place.
It might not be possible to replace all non‑renewable energy sources with renewable energy sources to generate enough electricity in the future.
Suggest two reasons why this might not be possible.
The table shows the percentages of electricity generated by different energy sources in the UK in
The student plots a bar chart using the data in the table.
Draw a bar for gas and a bar for wind on the bar chart.
The total electricity generated in the UK in 2020 was 315 TW h.
Solar produced 4% of the total electricity generated.
Calculate the amount of electricity generated in TW h from solar.
Amount of electricity =........ TW h
The total electricity generated in the UK in 2020 was 315 TW h.
1 TW h = 1 000 000 000 kW h
What is the total amount of electricity generated in kW h?
Tick (✓) one box.
A radio wave has a frequency of 88 MHz.
What is 88 MHz converted to kHz?
A 0.088 kHz
B 88 000 kHz
C 88 000 000 kHz
D 88 000 000 000 kHz
In 1709, William Derham measured the speed of sound using a cannon.
A cannon contains an explosive called gunpowder. When a cannon is fired, the gunpowder acts as a fuel and is ignited. A cannonball moves upwards through the air.
Describe the change in energy stores when a cannon is fired.
Derham climbed a church tower to look for the flash from the cannon and to hear its bang.
The cannon was fired a long distance away from the church.
Derham measured the distance between the cannon and the church.
Describe how Derham used the firing of the cannon to work out the speed of sound.
Why is it important that the cannon is a long distance away?
Derham calculated the speed of sound using an old unit of distance called the Parisian foot.
One value he calculated for the speed of sound was 1122 Parisian feet per second.
1 Parisian foot = 32.5 cm
Calculate Derham’s value for the speed of sound in m / s.
Speed =........ m / s
Today, scientists know the speed of sound is 1056 Parisian feet per second.
The percentage difference between Derham’s value and today’s value for the speed of sound is calculated using this equation:
Use this equation to evaluate the accuracy of Derham’s value for the speed of sound.
Fig. 12.1 shows air particles in a room.
Fig. 12.1
A scientist produces a sound wave in the room using a vibrating tuning fork.
Describe what happens to the air particles when the sound wave travels through the room as a longitudinal wave.
You can draw on Fig. 12.2 to support your answer.
Fig. 12.2
Explain in words what is meant by power.
A weightlifter lifts a 200 pound (200 lb) mass.
1 lb = 0.454 kg.
Calculate the weight of the mass in Newtons.
Use the equation: gravitational force = mass × gravitational field strength
Gravitational field strength = 10 N / kg.
This is some data for a weightlifter.
Weight lifted = 620 N Height of the lift = 1.6 m Time taken to complete lift = 4.0 s
Calculate the power generated by the weightlifter.
Use the equations: work done = force × distance power = work done / time
Thinking distance is directly proportional to speed.
The thinking distance at 30 mph is 9 m.
What is the thinking distance at 60 mph?
A 9 m
B 18 m
C 27 m
D 36 m
How many amperes are there in 1 microampere (1 
A)?
B 0.001
C 1000
The graph shows how speed in miles per hour (mph) is related to speed in metres per second
A car travels at 20 mph.
What is the speed of this car in m / s?
A 8 m / s
B 9 m / s
C 43 m / s
D 45 m / s
Which of the following is the same speed as 7.2 km / h?
A 2.0 m / s
B 20.0 m / s
C 25.9 m / s
D 120.0 m / s
A student makes some estimates about distance and time.
• 1 mile is about 1500 metres.
• 1 hour is about 3500 seconds.
The student uses this information to convert 30 mph to m / s.
Which answer is correct?
A 0.013 m / s
B 13 m / s
C 70 m / s
D 70 000 m / s
Memes
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Combined Science starter pack