CTET CTET Science 3

Question 1

A teacher asks students why a thick glass tumbler cracks when boiling water is poured into it. The best scientific explanation is:

Accepted Answer

Uneven thermal expansion causes stress in the glass

Answer

The inner surface of thick glass expands quickly while the outer surface remains cool, creating uneven thermal stress that cracks it.

Question 2

Which type of rock is formed from the cooling and solidification of magma or lava?

Accepted Answer

Igneous rock

Answer

Igneous rocks form when molten magma (underground) or lava (on the surface) cools and solidifies.

Question 3

What is the main cause of seasons on Earth?

Accepted Answer

Earth's axial tilt of 23.5 degrees

Answer

Earth's axial tilt of 23.5° causes different hemispheres to receive varying amounts of sunlight throughout the year, creating seasons.

Question 4

Which microorganism is responsible for the fermentation of milk into curd (yogurt)?

Accepted Answer

Lactobacillus

Answer

Lactobacillus bacteria ferment lactose in milk into lactic acid, which causes the milk to curdle and form yogurt.

Question 5

An object placed beyond the center of curvature (2F) of a convex lens forms an image that is:

Accepted Answer

Real, inverted, and diminished

Answer

When an object is placed beyond 2F of a convex lens, the image formed is real, inverted, and diminished (smaller than the object).

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