Scientific Variables and Experiments

Which of the following is a quantitative observation?

• That noise is annoying.

• The temperature is 21°C.

• This salad roll is delicious.

• It’s too hot in this room.

Which of the following is not used to hold liquids?

• Measuring cylinder.

• Beaker.

• Retort stand.

• Test tube.

A restaurant chef conducts an experiment in which several small potatoes of the same size are boiled for various amounts of time from 1 minute up to 15 minutes. Which of the following statements could be an aim of the experiment?

• The best time to cook a potato is ten minutes.

• After boiling for two minutes, a potato is still too hard to eat.

• To determine the time taken to perfectly cook a potato.

• Place a potato in a saucepan and cover with water.

Which of the following is an abbreviation for a unit of time?

• s

• t

• m

• km/h

To produce a Bunsen burner flame with the highest possible temperature, you would

• adjust the rubber hose connection.

• open the air hole half way.

• fully open the air hole.

• close the air hole.

A yellow Bunsen burner flame is called

• the safety flame.

• the danger flame.

• an old flame.

• a carbon flame.

How many variables should be changed at a time during an experiment?

• none

• one

• two

• as many as possible

Which of the following is not a branch of Science?

• biology

• geology

• chemistry

• astrology

Which of the following is a quantitative observation?

• The water was hot.

• The water was clear.

• The water was at a temperature of 34^oC.

• The water was colourless.

Which is the correct way of writing the unit symbol for kilogram?

• kg

• kgs

• KG

• Kg