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Vijay and Gopal are pulling a block with 22 N force 10 N force respectively in opposite direction. If Vijay pulls the block by a total distance of 6.5 m towards himself. Find the net work done by the forces acting on the block.

The man made allotrope of Carbon was developed by the scientists to pay respect to astronomical science but ultimately it ended up in some other application field. Could you guess?

Triple point of water is:-

Give one-word answer for the following: [5 MARKS]

i) Name any animal fibre.
ii) Which fibre keeps our body warm, wool or silk?
iii) Where are Angora goats found in India?
iv) Which country is the largest producer of silk?
v) What is yarn made up of?

Which process is used to separate a pure solid from a solid-liquid solution?

Which non-metal is used for bleaching? Explain its properties. [3 MARKS]

Question 3 (c)
Like synthetic fibres, plastic is also a _________.

Something that cannot be divided is called

What will be the colour change when phenolphthalein is added to hydrochloric acid?

Which of the following is usually not a water pollutant?

(a) sewage

(b) fertiliser

(c) fly ash

(d) pesticide

" Is malleable and ductile".This best describes:

(a) a metal

(b) a compound

(c) a non-metal

(d) a mixture

Why do we use few drops of dilute HCl acid to the electrolyte before we plug in the electrodes to the direct current?

What is endothermic reaction

Why a coating of zinc is deposited on iron used in bridges and automobiles?

Change the sentence to the active voice.

A gorgeous dress was sewed by the seamstress.

(a) What is meant by water pollution? What are the different ways in which water gets polluted?

(b) State the harmful effects of water pollution.

What is electrolyte and electrolysis

On decreasing the temperature, the solubility of solute in solution ______.

The metal calcium upon reaction with water forms bubbles of hydrogen gas. These gas bubbles stick to the surface of the metal making the metal to ___ on the water.

1. 2

What does the following statement mean? In a chemical reaction, the total mass of the reactants is equal to the total mass of the products.

Identify the chemical formula of Ozone gas.

What are the steps taken by the government to clean Ganga

The symbol 'Cu' is used for _____.

In the given figure below, the appropriate terms, A, B and C are:

Give reason :

(a) A person suffering from acidity is advised to make an antacid.

(b)Acidic soil is treated with quick lime.

(c) Wasp sting is treated with vinegar.

At critical temperature, What is the surface tension of a liquid ?

1. More reactive metals occur in the combined form where is less reactive metals occur as free metal in the nature give reasons

2. mention one use of each of the following

Copper,aluminium, phosphorus and hydrogen

Which of the following are the uses of nitric acid?

Name the acid formed when sulphur trioxide gas reacts with water.

Sodium bicarbonate solution and concentrated sulphuric acid in the fire extinguisher reacts to produce _______ gas.

If 100 g of salt is mixed with 100 g of sand. What happens to the taste of the salt crystals?

Microbes are helpful in oil recovery because:

The positively and negatively charged ions are respectively called ___ and ___.

Kerosene is commonly used to start a fire in the wood Give Reason

Which of the solution will not conduct electricity?

Which of the following salts when dissolved in water produce hard water?

Melamine is used in fire resistant fabrics. Why?

Can a body undergo physical as well as chemical change simultaneously? Support your answer with proper example.