Question
How will you test that ‘tea dust’ is not adulterated with iron powder?
✓
Answer
We can do a simple experiment for this:
- Take tea dust on a paper.
- Take a bar magnet in your hand.
- Place the bar magnet over this dust.
- If some particles are attracted strongly towards this magnet by clinging to it, then definitely tea dust will have iron powder.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Match the items of Column $I$ with the items of Column $II$
→| $COLUMN\ I$ | $COLUMN\ II$ | ||
| $(a)$ | weather cock | $(i)$ | gases and fine dust particles |
| $(b)$ | mountaineers | $(ii)$ | sailing yacht |
| $(c)$ | fine hair inside the nose | $(iii)$ | oxygen cylinders |
| $(d)$ | smoke | $(iv)$ | direction of air flow |
| $(e)$ | wind | $(v)$ | prevent dust particles |
Write two ways of water harvesting in Delhi. Discuss in brief.
What are $3R’s$? How should we adopt them? Explain.
→The process of condensation plays an important role in bringing water back to the surface of earth. Explain how?
Read the function of parts of a plant given below:
- Fixes plant to the soil.
- Prepares starch.
- Takes part in reproduction.
- Supports branches and bears flowers.
What is meant by a standard unit of measurement? Why is it necessary to have standard units of measurement? Name the SI unit of length. Write its symbol.
Like many animals although a car also moves it is not considered as a living orgainism. Give 2-3 reasons.
What is the importance of the presence of carbon dioxide in the atmosphere? What will happen if its concentration in the air increases?
Both Sarika and Mohan were asked to make salt solution. Sarika was given a teaspoonful of salt and half a glass of water, whereas Mohan was given twenty teaspoons full of salt and half a glass of water.
- How would they make salt solutions?
- Who would be able to prepare saturated solution?
Draw a labelled diagram of a flower.