Page 56 - UKCAT 2017

PRACTICE QUESTIONS
Quantitative Reasoning
QR3 Balloon Flights
Helium balloons are used for weather research. Here is some information about how the temperature of the atmosphere changes with height and how fast balloons ascend.
Dry Air Temperature decrease is 5.2oC per 500m.
Wet Air Temperature decrease is 2.8oC per 500m.
The rate of climb of a balloon is 4.8 metres per second.
In addition, here is some information about conversion factors.
5280 feet = 1 mile. 1 mile = 1.6 km.
You can convert oC to oF using the rule F = 1.8 × C + 32.
QR3-1 When the ground temperature is 24oC, what is the temperature,
QR3-3
A balloon rises in wet air from
a ground temperature of 24oC. How many minutes, correct to the nearest minute, will it take to reach a height where the temperature is 0oC?
A6
B8
C9
D 15
E 343
A balloon rises from the ground through dry air. After 5 minutes the temperature of the air round the balloon is 12oC. What is the ground temperature, correct to the nearest oC?
A 15oC B 16oC C 20oC D 27oC E 28oC
A balloon ew on Monday. A second balloon ew on Tuesday. The rate of climb of the second balloon was 25% more than the rst balloon’s. Both balloons ew to the same height. Which one of the following statements is true?
correct to 1 decimal place, in dry air at a height of 1.8 km?
A 5.3
B 10.1
QR3-5
C 13.9
D 18.7
E 19.3
A B C
The second balloon took 25% of the time that the first balloon did.
The second balloon took 75% of the time that the first balloon did.
The second balloon took 80% of the time that the first balloon did.
QR3-2 When the ground temperature is 24oC, at what height in dry air, correct to 1 decimal place, is the
A3.2km B3.8km C7.0km D7.5km E 15.0km
temperature -15oC?
QR3-4
56 UKCAT Of cial Guide 2017