Unit 8 Quiz II

Which of the following is the best description of a hypothesis?

• The title of the investigation you're doing

• A prediction which you can test

• The plan for your investigation

Quantitative or qualitative?

The resistance of a thermistor will decrease when the temperature is increased.

• Quantitative

• Qualitative

Quantitative or qualitative?

The energy output per gram of bioethanol is 50% lower than that of petrol.

• Quantitative

• Qualitative

Quantitative or qualitative?

The stopping distance will quadruple if the speed of a car is doubled.

• Quantitative

• Qualitative

Thermometer A measures to the nearest 0.1 degrees.

Thermometer B measure to the nearest 0.01 degrees.

Which is the correct statement?

• Thermometer A is more precise than thermometer B

• Thermometer B is more precise than thermometer A

• Thermometer A is more accurate than thermometer B

• Thermometer B is more accurate than thermometer A

The Penning Trap Mass Spectrometer allows scientists to measure the mass of individual atoms to the nearest 0.000000000000000000000000000000001g.

This piece of equipment is therefore very what?

• Accurate

• Precise

• Error free

• Perfect

Which variable goes on the left of a table?

HINT - IT'S THE ONE YOU CAN FILL IN BEFORE YOU DO THE EXPERIMENT

• Independent

• Dependent

• Control

Round the following number to 3 significant figures.

12.39472382784

• 12.39

• 12.3

• 12.4

• 12.395

Round the following number to 2 significant figures.

7.126427

• 7.13

• 7.1

• 7.2

• 7.0

What does directly proportional mean?

• Increasing the independent variable by a factor increases the dependent variable by the same factor

• Increasing the independent variable by a factor has no effect on the dependent variable

• Increasing the dependent variable by a factor sometimes increases the dependent variable by the same factor, but not always