CTET CTET Science 4

Question 1

Which property of sound determines whether it is perceived as high-pitched or low-pitched?

Accepted Answer

Frequency

Answer

Frequency (number of vibrations per second, measured in Hz) determines pitch; higher frequency produces a higher pitch.

Question 2

What is the role of decomposers in an ecosystem?

Accepted Answer

They break down dead organic matter and recycle nutrients

Answer

Decomposers like fungi and bacteria break down dead organisms into simpler substances, returning nutrients to the soil for reuse.

Question 3

A student finds that a substance turns blue litmus red and has a pH of 3. This substance is best described as:

Accepted Answer

A strong acid

Answer

A pH of 3 indicates a strong acid; such substances turn blue litmus red and have a large concentration of hydrogen ions.

Question 4

Which type of blood vessel carries oxygenated blood away from the heart to the body?

Accepted Answer

Arteries

Answer

Arteries carry oxygenated blood (except the pulmonary artery) away from the heart to various organs and tissues of the body.

Question 5

What is the purpose of the control variable in a scientific experiment?

Accepted Answer

To remain constant so that only one variable affects the outcome

Answer

Control variables are kept constant so they do not influence the result, ensuring that only the independent variable affects the dependent variable.

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