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Who is known as the father of physics?

The combined mass of water found on, under and above the surface of the Earth is called as 'hydrosphere'. It includes:

Why dose water rise up a blotting paper?

Find the odd one out of following:

Choose the synonym for the following word.

Chaos

How can we determine whether an object will float or sink in water? Explain with examples. [3 MARKS]

Which of the following will sink in water?

Why magnesium ribbon is rubbed with sandpaper before burning it?

In activity, a teacher dissolved a small amount of solid copper sulphate in a tumbler half filled with water. Which method would you use to get back solid copper sulphate from the solution?

(a) Decantation

(b) Evaporation

(c) Sedimentation

(d) Condensation

During summer season, it has been the regular feature that most of the source of water get dry including the only public hand tube well located in the centre of a village. A civil officer incharge of relief operations should take some advance measures including…

what is voluse?

Question 7 (d)

Find the odd one out from the following:
Sugar, Salt, Sand, Copper sulphate

___ is the process of separating the constituent particles of a mixture using a sieve.

What does the underlined preposition indicate?

The machine is used to separate the kernel from the husk.

A jeweller has two different samples of white gold. The first sample has two elements, gold and palladium in its composition. The second sample has gold and nickel in its composition. Both the samples are identical in appearance and have a uniform composition throughout. What can be said about the samples?

Question 16

Both Sarika and Mohan were asked to make salt solution. Sarika was given a teaspoonful of salt and half a glass of water, whereas Mohan was given twenty teaspoons full of salt and half a glass of water.
(a) How would they make salt solutions?
(b) Who would be able to prepare saturated solution?

Stones present in rice can be removed by:

clay is moulded into different shapes it is soft .when it is baked it is hard. Is it a chemical change or a physical change? How?

Which of the following is the major cause for discoloration of the Taj Mahal?

Phosphorus reacts with oxygen to form-

How will you separate a solution containing salt and sand?

Match the following:

$\begin{array}{cccc}\text{(i)}& \text{Can have variable composition of constituent elements}& \text{(A)}& \text{Compound}\\ \text{(ii)}& \underset{–}{}\underset{–}{}\underset{–}{}\text{is new substance formed due to reaction of two constituent elements}& \text{(B)}& \text{Mixture}\\ \text{(iii)}& \text{Constituent elements can be separated easily}& \text{(C)}& \text{Element}\\ \text{(iv)}& \text{Can be separated only by chemical or electrochemical reactions}& & \\ \text{(v)}& \text{Composition is always fixed}& & \\ \text{(vi)}& \text{Shows properties of constituent elements}& & \end{array}$

Sonali was going to cook rice.She found husk particles in the rice.What should she do to separate those husk particles from rice before cooking rice? [1 MARK]

Select the best option from which a coffee-cup can be made.

A solution contains y ml of acetone in 150ml of solution. The concentration of the solution is $25\%$ in terms of volume by volume percentage. Find y.

Rumi had doubts in his mind that, "Are changes helpful in life?”. To answer his question, the teacher asked him to do an activity. He asked the student to classify following changes into helpful and non-helpful from their perspective.

1.Farmers harvesting crop

2.Ripening of Fruits

3.Rancidity of food

How can you classify material based on its appearance? Give one example each

Match the type of fibre in column-I with their uses and characterstics in column-II
$\begin{array}{cc}\text{Column - I}& \text{Column - II}\\ \text{A. Acrylic}& \text{P. Contains repeating ester units}\\ \text{B. Cellulose}& \text{Q. Used for making sweaters}\\ \text{C. Polythene}& \text{R. Made up of large number of glucose units}\\ \text{D. Terylene}& \text{S. Used for manufacturing toys.}\end{array}$

Match the components in column I with the percentage by volume in column II as per the composition of air.

A man started to dig the ground. As he kept digging deeper and deeper he reached a level where all the spaces between particles of soil and gaps between rocks were filled with water. The upper limit of this layer is called

Match the following:

$\begin{array}{cccc}\left(i\right)& \text{Water}& \left(A\right)& \text{Compound}\\ \left(ii\right)& \text{Hydrogen}& \left(B\right)& \text{Element}\\ \left(iii\right)& \text{Table salt}& & \\ \left(iv\right)& \text{Gold}& & \\ \left(v\right)& \text{Carbon dioxide}& & \\ \left(vi\right)& \text{Iron}& & \end{array}$
The correct pairs are:-

Is vinegar soluble in water?

The process by which water is removed from the settled impurity is known as___________.

Mention three ways in which we can conserve water. [3 MARKS]

Marble cancer refers to:

Finding of ash indicated that there was

The object given below pollutes the area when thrown in water bodies. Which of the following option is correct?

What type of clothing materials are worn by astronauts and fireman and why ?

The specific gravity of a material is 0.76, it will ___

In the given experiment, fish in the second and third jar die due to the ____________

Why is air invisible to us?

The rules of spinning and weaving were written in

The property of the material which allows light to pass through them is called __.

The state of water changes from liquid to vapour on heating at ${100}^{\circ }C$. This process is known as