Wastewater Story — Science STD 7 — Question

What do you mean by an opaque materials? Also give an example.

What is the unit of heat?

Is cloud formation a physical change or chemical change? Explain.

Briefly state the effects of electricity.

How are heterotrophic plants are categorized?

A train travels 180 km in 3 h. Find its speed in:
(i) km/h
(ii) m/s
(iii) What distance will it travel in 4h if it maintains the same speed throughout the journey?

How does heat get transferred in these materials? (cooking utensils made of metals)

A group of students noticed that a torch does not light up even though the batteries are new. They replaced the wire and it worked. What scientific approach did the students use to solve the problem? Explain the role of hypothesis and experiment in this scenario.

What is rain water harvesting and how it is important?

Why we get muscle cramps after heavy exercise?