Exam code: 9702
1 markWhich definition is correct and uses only quantities rather than units?
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
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1 markWhat is a reasonable estimate for the gravitational force acting on an adult person standing on the Earth?
50 N
300 N
400 N
700 N
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1 markA physical quantity has the symbol 
and the unit m3.
Which physical quantity does represent?
Potential difference
Velocity
Pressure
Volume
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1 markWhat is a reasonable estimate of the number of seconds in a year?
5 × 105 s
1 × 106 s
3 × 107 s
7 × 108 s
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1 markA physical quantity has the unit m s−2 and the symbol 
.
What is the correct name for this quantity?
Activity of a radioactive source
Amplitude
Avogadro constant
Acceleration
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1 markA 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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1 markWhat is a reasonable estimate for the volume of 1 ml of water?
0.1 cm3
1 cm3
10 cm3
100 cm3
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Which row shows what all physical quantities must have?
magnitude | direction | unit | |
|---|---|---|---|
A | ✗ | ✗ | ✓ |
B | ✓ | ✗ | ✓ |
C | ✓ | ✓ | ✗ |
D | ✓ | ✓ | ✓ |
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1 markAn 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?
2 J
20 J
200 J
2000 J
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1 markWhich of the following is a reasonable estimate for the density of a sugar cube?
0.01 kg m−3
0.1 kg m−3
10 kg m−3
1000 kg m−3
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1 markWhich 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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1 markWhich statement is incorrect by a factor of 100 or more?
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
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1 markAn 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?
4 × 100 kg m s–1
4 × 101 kg m s–1
4 × 102 kg m s–1
4 × 103 kg m s–1
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1 markThe 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?
3 × 10−28 s
3 × 10−24 s
3 × 10−20 s
3 × 10−16 s
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1 markThe 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?
1 × 106 Pa
1 × 107 Pa
1 × 108 Pa
1 × 109 Pa
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