EduNinja
[Maximum number: 1]

Which definition is correct and uses only quantities rather than units?

A

Density is mass per cubic metre.

B

Potential difference is energy per unit current.

C

Pressure is force per unit area.

D

Speed is distance travelled per second.

[Maximum number: 2]

show that the distance moved down the slope is 9.3 m ,

(a)

Underline all the base quantities in the following list.
ampere charge current mass second temperature weight

[ 2 ]
[Maximum number: 3]

Measurements made for a sample of metal wire are shown in Fig. 1.1.

Fig. 1.1

Fig. 1.1

(a)

State the appropriate instruments used to make each of these measurements.

[ 3 ]
(i)

length

[ 1 ]
(ii)

diameter

[ 1 ]
(iii)

resistance

[ 1 ]
[Maximum number: 1]

What is a reasonable estimate of the average kinetic energy of an athlete during a 100 m race that takes 10 s ?

A

40 J

B

400J

C

4000J

D

40000 J

[Maximum number: 3]

Make estimates of the following quantities.

(a)

the thickness of a sheet of paper

thickness =mm [1]
[ 1 ]
(b)

the time for sound to travel 100 m in air

[ 1 ]
(c)

the weight of 1000 cm31000 \mathrm{~cm}^{3} of water

 weight =………………………………………...N[1]\text { weight }=\ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots . . . \quad \mathrm{N}[1]
[ 1 ]
[Maximum number: 1]

Which estimate is realistic?

A

The kinetic energy of a bus travelling on an expressway is 30000 J .

B

The power of a domestic light is 300 W .

C

The temperature of a hot oven is 300 K .

D

The volume of air in a car tyre is 0.03 m30.03 \mathrm{~m}^{3}.

[Maximum number: 1]

A student estimates the maximum speed of some different moving objects.
Which maximum speed is not a reasonable estimate?

A

container ship: 10 m s−110 \mathrm{~m} \mathrm{~s}^{-1}

B

Olympic sprinter: 0.1 km s−10.1 \mathrm{~km} \mathrm{~s}^{-1}

C

racing car: 9000 cm s−19000 \mathrm{~cm} \mathrm{~s}^{-1}

D

snail: 0.01 km h−10.01 \mathrm{~km} \mathrm{~h}^{-1}

[Maximum number: 1]

A student creates a table to show reasonable estimates of some physical quantities.
Which row is not a reasonable estimate?

quantity

value

electric current in a fan heater

12 A

mass of an adult person

70 kg

maximum speed of an Olympic sprint runner

10 ms−110 \mathrm{~ms}^{-1}

water pressure at the bottom of a garden pond

106 Pa10^{6} \mathrm{~Pa}

[Maximum number: 1]

Which term represents a physical quantity?

A

metre

B

percentage uncertainty

C

quark flavour

D

spring constant

[Maximum number: 1]

Which estimate is reasonable?

A

1×10−3 kg1 \times 10^{-3} \mathrm{~kg} for the mass of a grain of sand

B

1×10−2 m31 \times 10^{-2} \mathrm{~m}^{3} for the volume of a tennis ball

C

1×100 J1 \times 10^{0} \mathrm{~J} for the work done lifting an apple from waist height to head height

D

1×104 W1 \times 10^{4} \mathrm{~W} for the power of a light bulb in a house

0