Test on Biology Lab Measurement Techniques

Question 1: Indicators are dyes that change colour depending on whether they're in an acid or an alkali.

A. Ano

B. Ne

Explanation: Indicators are defined as dyes that change colour depending on whether they are in an acid or an alkali.

Question 2: Damp indicator paper cannot be used to test the pH of a gas sample.

A. Ano

B. Ne

Explanation: A piece of damp indicator paper can be held in a gas sample to test its pH, as stated in the study materials.

Question 3: What color does litmus paper turn when exposed to acidic and basic conditions, respectively?

A. Blue in acidic conditions, red in basic conditions.

B. Red in acidic conditions, green in basic conditions.

C. Red in acidic conditions, blue in basic conditions.

D. Green in acidic conditions, blue in basic conditions.

Explanation: According to the study materials, litmus paper turns red in acidic conditions and blue in basic conditions.

Question 4: According to the study materials, which statement accurately describes the function and output of pH probes?

A. They are dyes that change color depending on whether they are in an acid or an alkali.

B. They are a mixture of indicators that changes color gradually as pH changes, useful for estimating pH.

C. They are attached to pH meters which have a digital display that gives an accurate numerical value for the pH of a solution.

D. They are soaked into paper and used in strips to estimate pH based on color changes.

Explanation: pH probes are attached to pH meters which have a digital display that gives a numerical value for the pH of a solution, and they are used to give an accurate value of pH. The other options describe different pH measurement methods like indicators or universal indicator paper.

Question 5: Mastering laboratory techniques is optional for effectively working with the provided materials.

A. Ano

B. Ne

Explanation: The study materials state, 'make sure you know these techniques inside out so they're second nature when it comes to our materials,' indicating that mastering them is not optional but crucial for effective work.