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You find a substance that is bitter in taste. When you rubbed its solution on your fingers, it felt soapy. What is this substance most likely? [2 MARKS]

Calamine is acidic or basic ?

Plants absorb mineral nutrients and water from the

Megha's village was facing the problem of soil erosion. Choose the measures from the given options which you will suggest the people living in that village to prevent the soil erosion?

In which way do you think the seeds shown below are dispersed? Choose the correct option that matches the seed with its dispersal mode.

Question 1 (b)
Mark ‘T’ if the statement is true and ‘F’ if it is false.
(b) Water shortage is a problem faced only by people living in rural areas.

Which among the given bases is not an alkali?

The white hair on the sheep shown below is called ___.

Describe an activity to check the conductivity of different solutions formed by adding the following substances to distilled water.
i) Lemon juice
ii) Caustic soda
iii) Sugar [3 MARKS]

Fill in the blank :

Chemical changes are :

(a) always reversible. (d) mostly reversible

(b) always irreversible

(c) mostly irreversible

Which of the following reaction(s) involves absorption of light to initiate?

Which of the following is both a reversible and an irreversible change?

Answer the following:

a.From which animal the wool is obtained for Pashmina shawls. Name the region where this animal is found.

b.Shearing process is done in winters. True/False.

c.Write a note on selective breeding.

Being an active citizen of a country, which of the following will you support in relation to sanitation?

Which of the following is the correct descending order of atomic radius for the given elements?

Clouds are ___ collections of tiny water droplets and crystallized water molecules.

When a battery leaks why is it poisonous?

Chemical formula of a compound is determined on the basis of ___ of the constituent atoms.

What are the various methods used to separate insoluble solid particles like dust or soil from a liquid mixture? Explain each one of them. [3 MARKS]

After studying Shreya decided to make coffee. While making coffee she thought about the kind of change involved. What is it according to you?

Q57. Main pillars of the Namami Gange Programme, an initiative of Ministry of Water Resources (MOWR), among the following are:

1. Sewerage Treatment Infrastructure

2. River-Front Development

3. River-Surface Cleaning

4. Bio-Diversity

5. Industrial Effluent Monitoring

6. Ganga Gram

Select the correct code:

Identify solute and solvent in the following solutions :
(i) Aerated drinks
(ii) Tincture of iodine
(iii) Lemon water

State the principle of each of the following methods of separation of mixtures.
(i) Centrifugation method
(ii) Separation using separating funnel

[5 MARKS]

Which of these doesn't undergo sublimation?

What is valency of iron in $F{e}_2{O}_3$?

If ${\Lambda }_c$ for $N{H}_{4}OH$ is 11.5 $oh{m}^{-1}c{m}^{2}mo{l}^{-1}$, its degree of dissociation would be
(given that ${\lambda }^{\circ }N{H}_4^{+}$ = 73.4 and ${\lambda }^{\circ }O{H}^{-}$ = 197.6 $oh{m}^{-1}c{m}^{2}mo{l}^{-1}$ )

Which of the following substance can be used to make a fire extinguisher?

Which alkaline earth metal is formed by the decay of uranium?

Which of the following gases is mostly responsible for global warming?

Sliced apples turn brown after some time. What is the reason for this? Which type of change is this? What kind of change is cutting of apples? [2 MARKS]

Question 7 (b)
Fill in the blank:
(b) A forest is a purifier of __ and __.

Question 8
Match the words of Column I with those given in Column II:
$\begin{array}{cc}\text{Column I}& \text{Column II}\\ \text{1. Scouring}& \text{(a) Yields silk fibres}\\ \text{2. Mulberry leaves}& \text{(b) Wool yielding animal}\\ \text{3. Yak}& \text{(c) Food of silk worm}\\ \text{4. Cocoon}& \text{(d) Reeling}\\ & \text{(e) Cleaning sheared skin}\end{array}$

why it's called as infiltration

Identify the non-metal which exists in liquid state from the options given.

The topmost layer of the atmosphere is called ___ .

Which of the following acids is present in the Proteins?

What of the following is a representation of a chemical reaction?

The splinter bursting into a flame indicates that the tube contains:

Arrange the following in ascending order of their atomicity:
Oxygen, Sulphuric acid and Ammonium chloride.

The major contributor of carbon-monoxide is

Which of the following has no effect on red litmus?

Which of the following plant parts can respire even in the absence of oxygen?

Describe vermi-processing toilet. Why shouldn't we throw chemicals like paints, solvents, insecticides, motor oil, medicines down the drain? [5 MARKS]