CTET Science Flashcards

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

Answer: Frequency

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

What is the role of decomposers in an ecosystem?

Answer: They break down dead organic matter and recycle nutrients

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

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

Answer: A strong acid

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

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

Answer: Arteries

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

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

Answer: To remain constant so that only one variable affects the outcome

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

Which layer of the Earth's atmosphere contains the ozone layer that absorbs harmful UV radiation?

Answer: Stratosphere

The ozone layer is located in the stratosphere, approximately 15–35 km above Earth's surface, where it absorbs most of the Sun's ultraviolet radiation.

In science education for upper primary classes, using everyday examples like bicycles to teach force and motion is effective because it:

Answer: Connects abstract concepts to students' prior experiences

Anchoring abstract science concepts to familiar real-world objects activates prior knowledge and makes new concepts meaningful and easier to understand.