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Materials made of iron lose their shine and become dull because of:

Raj's house was under construction.During the construction, he saw a man removing pebbles and stones using a plastic mesh held in a frame.Which method of separation is used here? Explain it in detail. [3 MARKS]

Which of the following state has the maximum interparticle forces of attraction?

Which of the following is a recently originated problem of environment?

Which of the following materials did our very early ancestors use to manufacture clothes?

Which of the following gases when decreased in the air increases the breathing rate?

What is the substance called that takes part in a chemical reaction

In churning milk, the need for churning out butter is:

Which fuel can be used in vehicles to reduce pollution?

What is thermal pollution? What are its effects? [2 MARKS]

Which of the following is correct regarding physical and chemical changes?

Which of the following soil is the best for plant growth?

Which of the following filter/ filters can Sumit use to separate chalk pieces from water?

Below mentioned image shows a woman making yarn using which instrument/apparatus?

What is the chemical formula of Aluminium Chloride?

Goutham was unable to complete the assignment given to him. He had to complete the following table.

The objects that he should choose are?
$\begin{array}{cc}\text{Material}& \text{Objects made of these materials}\\ \text{Wood}& \text{Chair, table, ploughs}\\ \text{Paper}& \text{Books, notebooks, toys}\\ \text{Leather}& \end{array}$

The formula for Magnesium carbonate is:

Champo and Wampo are twin frogs. Champo lives on the ground whereas Wampo lives in the pond. Champo wonders how Wampo respires in water. He thinks Wampo carries an oxygen cylinder like scuba divers. On the other hand Wampo wonders how Champo survives on land. He thinks Champo carries an oxygen cylinder like the mountaineers. Do you think their assumption is right?

Infiltration is a process in which rain water seeps inside the ___?

What type of change is depicted by sharpening a pencil which will reduce its length?

Choose the correct options for the blanks.

Mahatma Gandhi ___ who was born in 1969___ is known as the father of the nation.

When salt is mixed in water, it's level remains unchanged, why?

Besides sheep, wool can also be obtained from which of the following animal /animals?

Observe the given figure.

What is the purpose of this experiment?

Statements:

No wood is table.

Some tables are chairs.

All chairs are stones.

Conclusions:

I. No stone is wood.

II. Some stones are tables.

Why is sand insoluble but sugar soluble as the atoms present in the water have gap between them then any substance can fill those gaps .

Arrange solid, liquid, gas on the basis of the rate of diffusion in ascending order.

Which of the following material is transparent?

The point beyond which the substance will no longer dissolve in the solution is called:

Select the items found inside a home.

What steps can be taken to conserve groundwater? [3 MARKS]

Which of the following is not a macronutrient?

The separation of particles through centrifugation depends upon the ___ of the constituent particles.

Different components present in soda are:

Identify the verb which gives simple future tense to the sentence.

Martha is so thirsty that she will drink water directly from the pond.

You are given sugar solution in laboratory. Select the fastest way of separating sugar from its solution.

What is spinning?

Nishant wants to present his friend a gift made of plant fibre. What should he choose as the gift?

Question 19.2

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.
Do you think tiny bubbles will appear on heating the water taken out from the bottle? Justify your answer.

Which of these physical properties do not change when two different substances are used to form a mixture?

What is the chemical name for Milk.