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Pollution from animal excreta and organic waste from the kitchen can be most profitably minimized by:

Which of the following is/are natural habitat(s) for conserving wildlife?

Explain soil profile

What is an electron configuration table?

We are using a large number of substances such as lemon,orange juice,baking soda and vinegar in our daily life. Which of the following substance has a bitter taste?

Question 5

Soil has particles of different sizes. Arrange the words given below in increasing order of their particle size.

Ignition temperature is the lowest temperature at which a substance catches fire. Identify the correct option regarding the ignition temperature of a good fuel.

Question 9 (d)

True or false?
Grain and husk can be separated with the process of decantation.

Heating will produce what sort of change?

What is infiltration

Question 12 (e)

State whether the following statement is true or false. If false, correct it.
Yak hair is not used to make woolen fabric.

Which metal is used to galvanise iron to protect it from rust

A vendor selling juice uses a strainer to separate the pulp from the juice. The method of separation used by him is

What do we understand by flammability of substance?

What is the source of litmus solution? What colour does it exhibit in acidic and basic solution? [2 MARKS]

The Atomic number for a neutral atom could be equalized to

The South Asian countries that have still polio cases are

___ method is suited for separating the component substances from a liquid mixture by selective evaporation and condensation.

If one end of a piece of a metal is heated, the other end becomes hot after some time. This is due to

[CBSE PMT 1995]

Which of the following statements are true regarding the oxygen atom?

The main property of an alkali which differentiates it from a base is

An unwanted particle inhaled by the nasal cavity:

Match the following:

$\begin{array}{cc}\text{Column - I}& \text{Column - II}\\ A.\text{Manganese}& 1.\text{Vitamin A production}\\ B.\text{Copper}& 2.\text{Role in Nitrogen fixation}\\ C.\text{Boron}& 3.\text{Photolysis of water}\\ D.\text{Molybdenum}& 4.\text{Acts as antifungal}\\ & 5.\text{Required for pollen germination}\end{array}$

Which one of the following phenomena would increase on raising the temperature?

Which of the following process releases nitrogen back into the atmosphere?

1)State and explain in brief different methods to prevent rusting of iron

2)What is displacement reaction give an example

The term chemical formula mean

Identify the compound noun in the sentence.

The gentleman spoke very politely to the young lady.

Why do farmers use fertilizers

The caterpillar completely covers itself by silk fibres and forms a covering. What is this covering known as?

An example in which both physical and chemical change occurs?

Question 8

Unscramble the following jumbled words related to soil.

Which of the following elements are said to have monoatomic molecule?

During the manufacturing of soap, the stone powder and sodium silicate are added for:

If a 50g sample of soil absorbs 15mL of water, the percentage of moisture absorption is ___%.

Question 8 (c)
Explain why:
(c) Factory waste is neutralised before disposing it into the water bodies.

A radioactive element X converts into another stable element Y. Half-life of X is 2 h. Initially only X is present. After time t, the ratio of atoms of X and Y is found to be 1 : 4, then t in hour is

What is a noble gas

Question 14

Match the items of Column I with the items given in Column II

Which of the following will not contribute to sewage water?