Secondary School (English Medium) (5 to 8) Class 6 - CBSE Question Bank Solutions for Science

Why do you think oxygen dissolved in water is important for the survival of aquatic animals and plants?

Differentiate among opaque, translucent and transparent materials, giving one example of each.

Sugar, salt, mustard oil, sand, sawdust, honey, chalk powder, petals of flower, soil, copper sulphate crystals, glucose, wheat flour are some substances given to Paheli. She wants to know whether these substances are soluble in water or not. Help her in identifying soluble and insoluble substances in water.

Four mixtures are given below.

1. Kidney beans and chick peas
2. Pulses and rice
3. Rice flakes and corn
4. Potato wafers and biscuits

Which of these can be separated by the method of winnowing?

Which type of movement would have been possible if

our elbow had a fixed joint.

Which type of movement would have been possible if

we were to have a ball and socket joint between our neck and head.

Unscramble the jumbled word and write it in the blank space provided.

iontcaronct ................

Unscramble the jumbled word and write it in the blank space provided.

sangro inerlan ................

Unscramble the jumbled word and write it in the blank space provided.

laxaeriont ................

Read the story titled “WISE FARMER” and tick the correct option to complete the story.

A farmer was sad/happy to see his healthy wheat crop ready for harvest. He harvested the crops and left it under the sun/rain to dry the stalks. To separate the seeds from the bundles of the stalk he hand picked/threshed them. After gathering the seed grains he wanted to separate the stones and husk from it. His wife winnowed/threshed them to separate the husk and later sieved/hand picked to remove stones from it. She ground the wheat grains and sieved/filtered the flour. The wise farmer and his wife got a good price for the flour. Can you tell why? 

Pick the change that can be reversed from the following.

Which of the following change cannot be reversed?

An iron ring is heated. Which of the following statement about it is incorrect?

While lighting a candle, Paheli observed the following changes.

1. Wax was melting
2. Candle was burning
3. Size of the candle was reducing
4. Melted wax was getting solidified.

Of the above, the changes that can be reversed are

Salt can be separated from its solution (salt dissolved in water), because ______.

Rolling of chapati and baking of chapati are the changes that ______.

Look at the figure which shows three situations.

A piece of iron is heated till it becomes red-hot. it then becomes soft and is beaten to a desired shape. What kind of changes are observed in this process-reversible or irreversible?

Paheli had bought a new bottle of pickle from the market. She tried to open the metal cap to taste it but could not do so. She then took a bowl of hot water and immersed the upper end of the bottle in it for five minutes. She could easily open the bottle now. Can you give the reason for this?

Can we reverse the following change? If yes, suggest the name of the method.

Water into water vapour