Explore topic-wise InterviewSolutions in .

What type of pollution does the image depict?

Majority of the minerals are absorbed by active transport because ________.

Why are these articles are made up of plastic? Do they follow the 4R principle? [3 MARKS]

The substance that is composed of two or more elements that are chemically combined with one another in a fixed proportion by mass is called ___

Which of the following is a product of coal?

The element whose oxide will turn red litmus solution to blue will be:

(a) sodium

(b) sulphur

(c) carbon

(d) sonorousness

A cubical block of side 10 cm floats at the interface of an oil and water. The pressure excluding pressure of atmosphere at the lower face of the block is:

These are the molecules of which state of matter?

Burning cotton or cotton clothes smell like burning paper whereas burning wool Smells Like a burning hair Why?

The atomic number of sodium is 11. What is the electrical charge of its atom?

To what height should an object of mass $\text{2 kg}$ be raised so that its potential energy is $\text{980 J}$?(Take, $g=9.8m{s}^{-2}$)

Coal burns in air to form mainly:

The compressibility factor of a gas is less than 1 at STP. Its molar volume Vm will be

What type of change is the spoiling of food?

Name the various air pollutants discharged by motor vehicle exhausts.

Which of the following is a suitable drying agent for hydrogen?

Suresh and Mukesh were playing with the candle flame. Suresh passed his finger from the flame and did not burn whereas when Mukesh did the same he burned his finger. Which part of the flame Mukesh has touched?

When was the first Smoke Abetment Act passed?

Connect the boxes:

1. 2.

3. 4.

5. 6.

How many electrons are shared in between the atoms of Nitrogen molecule?

What kind of energy does a running athlete possess?

Heating of coal in the absence of air is known as:

Change of day and night is an example of ____ change.

Select the oxides responsible for acid rain.

A metal X can replace another metal Y from its metal salts. Is X above or below Y in the reactivity series?

Why doesn't the paper burn in case 1 whereas it does in case 2? [3 MARKS]

State one use of the following non-metals:

(a) Oxygen (b) Nitrogen (c) Sulphur (d) Chlorine (e) Iodine

The incomplete combustion of firewood in homes produce a very poisonous gas X. When inhaled, gas X combines with the substance Y present in blood and reduces the capacity of blood to carry gas Z causing respiratory problems and suffocation. What are X, Y and Z?

A man $M_1$ of mass 80 kg runs up a staircase in 15 s. Another man M₂ also of mass 80 kg runs up the same staircase in 20 s. The ratio of the powers developed by them will be

Explain how, the use of plastic has a bad effect on the environment.

A fire propagates because during burning:

Explain the difference between pure air and polluted air.

Fabric made from which of the following fibre does not get wrinkled easily?

The process of burning a substance in the presence of oxygen is called ___.

In fractional distillation, oil is heated to about:

Carbonization is defined as:

Which is the only non-metal hydride that is basic in nature?

Which is Hardest non metal

Balance the following equation by short-cut method, and write the coefficient for $O_2{C}_5{H}_{11}N{H}_2+O_2\to C{O}_2+H_{2}O+N{O}_2$___

Can pickles be kept in aluminium container? Explain.

What is fusible

Name a metal attacked by cold water, hot water and and steam.

Three alcohols - ethanol, propanol and butanol are mixed and heated for a long time in a beaker. Which is the last one to evaporate?

Explain how rayon, nylon and polyester are obtained? [3 MARKS]