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Is blowing of a balloon reversible or irreversible change? /How?

Question 19.1

Paheli kept some water in a beaker for heating. She observed
that tiny bubbles appeared before the water started to boil.
She boiled the water for about 5 minutes and filled it in a
bottle up to the brim and kept the bottle air tight till it cooled
down to room temperature.

Why did the tiny bubbles appeared?

Roughage and water help in regulating ___.

How is soil formed?

Which of the following statement is correct?

Which of the following is not an example of natural fibre?

Which property of metals allows their usage as ornaments? [1 MARK]

Does the colour of the eyes of a link help it to remain undected in the dry grass leand

State any five methods of separating a solid-solid mixture.

Which one of the following is the process of making yarn from fibres?

Knitting is the process in which:

What happens when we add chalk powder in water?

We often put wet clothes out in sunny, open terraces for them to dry. This works because of the phenomenon called ___.

Question 23

Fill in the names of useful items made from jute fibres in the following figure, One such example is given

Question 17.3

Explain the following observations very briefly

An empty glass in fact is not empty.

Chanakya on his way to home saw a farmer digging the soil. He observed that digging tool had an iron blade fixed to a wooden handle. He wondered how the iron blade gets fixed to a wooden handle even when the iron ring is smaller than a wooden handle. What do you think can be the way to do this?

On a given winter night, Himanshu has two options, either to use a single layer blanket or two layers of same blanket. Which option will keep him more warm?

Can sedimentation and decantation be used to separate a mixture of salt and water? Give reasons for your answer.

During the process of combustion, which of the following forms of energy is released?

Question 4 (vi)

State whether the statement given below is True or False.

Oil mixes with water.

The principle of the 'difference in the weight of particles' is used in the process of

Where does this water vapour go after evaporation?

Sushma has to prepare a biryani, before that she has to remove dust particles from the rice. Which of the following cannot be done?

A clinical thermometer is

Which collocation has been used correctly?

She (a) took / (b) gave an exam in May.

The doctor (c) gave / (d) took Marianne an examination.

In which food are roughage present- plant food, animal food or both? Give reasons

Which type of material allows light to pass through it completely through it?

The separation of substances from a mixture by picking by hand is called:

For which one of the following is capillarity not the only reason?

Question 3 (b)

Fill in the blanks:
Animals fibres are ___ and ___.

During threshing, the stalks are converted into:

Which among the following technique is more time consuming?

Where are synthetic fibres obtained from?

Define work energy theorem. [3 MARKS]

Manure may not provide all the nutrients to the plants. Why?

Question 19

You are provided with a mixture of salt, sand, oil and water. Write the steps involved for the separation of salt, sand and oil from the mixture by giving an activity along with the diagram.

Burning of a candle is:

What is the importance of grouping? [1 MARK]

The process by which a solid changes into a liquid is called?

Water is a very good ---------------------- .

Which of the following are made of metal?

Hold some cotton wool in one hand. Pinch some cotton between the thumb and forefinger of the other hand as shown in below mentioned image. On gently pulling out the cotton, while continuously twisting the fibres what is formed?