17 questions · 17 marks · ≈ 17 min
Which definition is correct and uses only quantities rather than units?
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Density is mass per cubic metre
Potential difference is energy per unit current
Pressure is force per unit area
Speed is distance travelled per second
What is a reasonable estimate for the gravitational force acting on an adult person standing on the Earth?
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50 N
300 N
400 N
700 N
A physical quantity has the symbol and the unit m3.
Which physical quantity does represent?
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Potential difference
Velocity
Pressure
Volume
What is a reasonable estimate of the number of seconds in a year?
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5 × 105 s
1 × 106 s
3 × 107 s
7 × 108 s
A physical quantity has the unit m s−2 and the symbol .
What is the correct name for this quantity?
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Activity of a radioactive source
Amplitude
Avogadro constant
Acceleration
Which of the following must all physical quantities have?
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Direction and magnitude
Direction and a unit
Magnitude and a prefix
Magnitude and a unit
A student creates a table to show reasonable estimates of some physical quantities.
Which row is a reasonable estimate?
| quantity | value | |
|---|---|---|
| A | frequency of a radio wave | 500 pHz |
| B | mass of an atom | 500 μg |
| C | the Young modulus of a metal | 500 kPa |
| D | wavelength of green light | 500 nm |
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What is a reasonable estimate for the volume of 1 ml of water?
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0.1 cm3
1 cm3
10 cm3
100 cm3
Which row shows what all physical quantities must have?
| magnitude | direction | unit | |
|---|---|---|---|
| A | ✗ | ✗ | ✓ |
| B | ✓ | ✗ | ✓ |
| C | ✓ | ✓ | ✗ |
| D | ✓ | ✓ | ✓ |
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An adult male stands with a litre carton of milk balanced on his head.
What is the best estimate of the gravitational potential energy of the milk carton?
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2 J
20 J
200 J
2000 J
Which of the following is a reasonable estimate for the density of a sugar cube?
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0.01 kg m−3
0.1 kg m−3
10 kg m−3
1000 kg m−3
Which row shows a reasonable estimate?
| quantity | value | |
|---|---|---|
| A | kinetic energy of a bus travelling on an expressway | 30 000 J |
| B | power of a domestic light bulb | 300 W |
| C | temperature of a hot oven | 300 K |
| D | volume of air in a car tyre | 0.03 m3 |
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Which statement is incorrect by a factor of 100 or more?
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Atmospheric pressure is about 1 × 105 Pa
Light takes 5 × 102 s to reach us from the Sun
The frequency of ultraviolet light is 3 × 1012 Hz
The life-span of a man is about 2 × 109 s
An adult person jumps from a wall which is 2 m high. They land without rebounding.
What is the best estimate for the change in momentum of the person?
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4 × 100 kg m s–1
4 × 101 kg m s–1
4 × 102 kg m s–1
4 × 103 kg m s–1
The diameter of a proton is approximately 1 × 10-15 m.
Which estimate is reasonable for the time taken for light to cross the nucleus of a hydrogen atom?
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3 × 10−28 s
3 × 10−24 s
3 × 10−20 s
3 × 10−16 s
The bottom of the Mariana Trench is estimated to be approximately 11 000 m below sea level.
What is the best estimate of the total pressure at the bottom of the Mariana Trench?
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1 × 106 Pa
1 × 107 Pa
1 × 108 Pa
1 × 109 Pa
A satellite orbits Earth at an altitude of 400 km above the Earth's surface.
What is a reasonable estimate of the total distance travelled by the satellite in one complete orbit?
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4 × 105 m
4 × 106 m
4 × 107 m
4 × 108 m