Take this Quiz: Science 1 — data, design and two scientists | Zestly

Question 1

A biologist studies plant growth under different light colors. Group A (red light) grew 10 cm. Group B (blue light) grew 12 cm. Group C (green light) grew 5 cm. The soil type, water volume, and temperature were held constant for all groups. Which of the following is the independent variable?

Accepted Answer

Light color

Answer

Plant height

Answer

Soil type

Answer

Water volume

Question 2

Two scientists discuss the formation of a specific rock layer. Scientist 1 argues the layer formed through rapid volcanic ash deposition. Scientist 2 argues it formed through slow accumulation of marine sediment. Both agree the layer contains high levels of silica. Which observation would most strongly support Scientist 1?

Accepted Answer

The presence of angular, unsorted volcanic glass shards

Answer

The presence of fossilized marine shells

Answer

The presence of fine, horizontal bedding planes

Answer

The presence of high iron content

Question 3

In one experiment a student measured the rate of an enzyme-catalysed reaction at four pH values, holding temperature and enzyme concentration constant. The rates, in micromoles per minute, were: pH 2, rate 5; pH 4, rate 15; pH 6, rate 25; pH 8, rate 10.

Which statement about the enzyme's optimum pH do these results support?

Accepted Answer

The optimum lies somewhere between pH 4 and pH 8, and these four values cannot fix it more closely than that.

Answer

The optimum is exactly pH 6, since that is where the highest rate was recorded.

Answer

The optimum is above pH 8, since the rate was still rising at the last value tested.

Answer

The optimum is below pH 2, since lower pH always favours enzyme activity.

Question 4

In a physics experiment, a ball is dropped from heights of 1m, 2m, 3m, and 4m. The time taken to hit the ground is recorded. Why would a student repeat each trial three times?

Answer

To change the independent variable

Answer

To prove the hypothesis is correct

Answer

To account for random measurement error

Answer

To increase the height of the drop

Question 5

Two models describe planetary atmosphere loss. Model A suggests solar wind strips away gases. Model B suggests gravitational escape is the primary driver. Both agree that lighter gases are lost faster. If a planet has a very strong magnetic field, which model would predict higher gas retention?

Answer

Model A

Answer

Model B

Answer

Both models equally

Answer

Neither model

Question 6

A chemist measures the conductivity of a solution as the concentration of dissolved ions increases. At 0.1 M, conductivity is 5 mS/cm. At 0.2 M, it is 10 mS/cm. At 0.3 M, it is 15 mS/cm. What is the predicted conductivity at 0.5 M?

Answer

18 mS/cm

Answer

20 mS/cm

Answer

22 mS/cm

Answer

25 mS/cm

Question 7

In an experiment testing battery life, three brands are tested at a constant temperature of 25 degrees Celsius. Brand X lasts 10 hours, Brand Y lasts 12 hours, and Brand Z lasts 11 hours. What is the purpose of keeping the temperature constant?

Answer

To make the batteries last longer

Answer

To ensure temperature does not affect the results

Answer

To test if temperature changes battery life

Answer

To allow the batteries to charge