Motion and Measurement of Distances — Science STD 6 — Question

Distinguish between the following.
Insulator and Conductor.

Mark the north-poles of two bar magnets and bring the poles of the magnets near each other, and note down your observations in table.

Activity.

1. Make a mixture of dry sand with sawdust or powdered dry leaves. Keep this mixture on a plate or a newspaper. Look at this mixture carefully.

Can the two different components be made out easily? Are the sizes of particles of the two; components similar? Would it be possible to separate the components by handpicking?

2. Now, take your mixture to an open ground and stand on a raised platform. Put the mixture in a plate or sheet of paper. Hold the plate or the sheet of paper containing the mixture, at your shoulder height. Tilt it slightly, so that the mixture slides out slowly.

What happens? Do both the components– sand and sawdust (or powdered leaves) fall at the same place? Is there a component that blows away? Did the wind manage to separate the two components?

The handles of the tools like screwdrivers and pliers used by electricians for repair work usually have plastic or rubber covers on them. Can you explain why?

Boojho fell off a tree and hurt his ankle. On examination the doctor confirmed that the ankle was fractured. How was it detected?

What is life?

Why do we need to group materials?

Write three important properties of a balanced diet.

Classify the following as renewable or non-renewable resources— coal, natural gas, forests and minerals.

Write three functions of the root.