Acids, Bases and Salts — Science STD 7 — Question

Which type of mirror can form a real image?

Condensation of steam is chemical process or physical change?

Kidneys are the major excretory organs in humans. How will the waste products released will be excreted out if the kidneys are damaged or unfunctional?

What is the effect of sulphurous acid on blue litmus paper?

Fill in the blanks in the following statements. Silk fibres come from _______ of silk _______.

Suppose a new material was discovered. It is shiny, can be drawn into wires and conducts electricity well. Would you classify it as a metal or a non-metal? Why?

Write the word equation of photosynthesis.

Which metal is used in the bulb of a thermometer?

On a very cold morning, Boojho and Paheli were talking with each other as they walked down to their school. They observed that the air coming out of their mouth looked like smoke. They were amused and wondered how it happened. Help them find the answer.

Why are green plants called autotrophs?