Garbage In, Garbage Out — Science STD 6 — Question

While travelling in a train, it appears that the trees near the track are moving whereas co-passengers appear to be stationary. Explain the reason.

List five liquids that are transparent.

Why do wet clothes placed on a clothes line get dry after some time? Explain.

You are provided with the following materials-turmeric, honey, mustard oil, water, glucose, rice flour, groundnut oil.
Make any three pairs of substances where one substance is soluble in the other and any three pairs of substances where one substance remains insoluble in the other substances.

How can you show that unlike poles attract each other while like poles repel each other?

Activity.

1. Heat a beaker containing some water. Allow the water to boil. If you continue heating, would the water turn into steam and disappear completely?
2. Now, add two spoons of salt to water in another beaker and stir it well. Do you see any change in the colour of water? Can you see any salt in the beaker, after stirring
3. Heat the beaker containing the salt water (Fig.). Let the water boil away. What is left in the beaker?

Which of the following changes cannot be reversed?

1. Blowing of a balloon.
2. Folding a paper to make a toy aeroplane.
3. Rolling a ball of dough to make roti.
4. Baking cake in an oven.
5. Drying a wet cloth.
6. Making biogas from cow dung.
7. Burning of a candle.

Observe the picture given in Fig. carefully and answer the following questions.

1. What is covering the nose and mouth of the police man?
2. Why is he putting a cover on his nose?
3. Can you comment on air quality of the place shown in the Fig.

On what basis are the various objects grouped?

What do you mean by herbivores and carnivores animals?