Question

A group of students is investigating how the addition of salt impacts the floatation of an egg in water. Four identical cups were taken for the experiment. The data of the experiment are shown below:
Experimental Record
Cup Amount of Water (mL)
1 450
2 450
3 450
4 450

Amount of Salt (g)
1 0
2 68
3 136
4 272

Level of Egg above Water
1 Sinks to bottom
2 2 cm
3 3 cm
4 4 cm

Which cup acts as a control group?

A. 1

B. 2

C. 3

D. 4

Answer 1

Answer: The correct answer is Option 1.

Explanation:

Control group is the group used in the experiment by the researchers in which no change in the variable is done. It is then set as a benchmark for the groups which are being tested.

We are given 4 groups which are being experimented for the flotation of an egg in water. As in Cup 1, there is no addition of salt and hence there is no change in the variables. So, this is set as a benchmark fro the cups which are further used in the experiment conducted.

Hence, the correct answer is Option 1.