[ Question Bank ] - 2022 — Science STD 10 — Question

In cold regions, the winter rocks cracks due to anomalous expansion of water.

In cold countries, in winter, even when the water of lakes freezes, aquatic animals and plants can survive.

Write scientific reason.
The coin disappears in a vessel as it is seen from a specific location. But as soon as the water is poured into the vessel to a certain level, the coin appears.

Carbon atoms are capable of forming an unlimited number of compounds.

Atomic energy is an extensive source of energy.

Though tortoise lives on land as well as in water, it cannot be included in class- Amphibia.

The sun is seen on the horizon a little before sunrise.
(OR)
The sun is seen on the horizon for sometime even after sunset.

Write scientific reason.
The Launch vehicles are very costly.

Alkali metals are placed in Group 1.

Oxygen is necessary for complete oxidation of glucose.