CTET CTET Science 5

Question 1

Which phenomenon explains why a spoon partially submerged in a glass of water appears bent at the water's surface?

Accepted Answer

Refraction of light

Answer

Refraction is the bending of light as it passes from one medium (water) to another (air) at different speeds, making the spoon appear bent.

Question 2

Which component of food provides the body with energy most quickly?

Accepted Answer

Carbohydrates

Answer

Carbohydrates are broken down into glucose, which is the body's primary and quickest source of energy for cellular processes.

Question 3

A student notices that plants placed near a window grow toward the light. This response of plants to light is called:

Accepted Answer

Phototropism

Answer

Phototropism is the directional growth response of plants toward (positive) or away from (negative) a source of light.

Question 4

What happens to the resistance of a metallic conductor when its temperature increases?

Accepted Answer

Resistance increases

Answer

In metallic conductors, rising temperature causes atoms to vibrate more, impeding electron flow and increasing electrical resistance.

Question 5

Which method of food preservation uses high temperatures to kill microorganisms in milk without changing its taste significantly?

Accepted Answer

Pasteurization

Answer

Pasteurization heats milk to 72°C for 15 seconds to destroy harmful pathogens while minimally affecting flavor and nutritional value.

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