Explore topic-wise InterviewSolutions in Current Affairs.

Select the irreversible change.

Plants and animals living in a habitat are known as its __ components.

Who wrote the journal ‘Young India’?

Why do we need to change water frequently in an aquarium?

Which among the following is a pure substance?

What conditions do we need to see dust particles in the air?

While researching on various components of air, a scholar Rakesh passed a gas through limewater.
He observed that the limewater turned milky. Identify the gas from the following.

Solubility in water is always calculated for a solute with respect to:

Match the type of fibre in column-I with the type of product in column-II.
Column – I Column – II
A. Natural fibre P. Terylene
B. Synthetic fibre Q. Terry wool
C. Semisynthetic fibre R. Wool

Which of the following organisms take in oxygen from water?

I know that clouds are made up of water vapour. But when it rains due to evaporation,why don't the clouds become water totally? And why the clouds are still there in the sky after rain?

Question 3

An iron ring is heated. Which of the following statement about it is incorrect?
(a) The ring expands
(b) The ring almost comes to the same size on cooling
(c) The change in this case is reversed
(d) The ring changes its shape and the change cannot be reversed

Yarn is made up of thinner strands which are called:

Which among the following is an example of reversible changes?

Name the method of separation shown by the image:

Which of the following has a definite volume but no definite shape?

There is a source of water that we do not see but it is the primary source of many lakes, ponds etc. What type of water is being referred to?

Is oil denser than water?

Identify the objects that are made up of natural substances.

Which of the following breed of sheep are commonly reared in Gujarat?

What is the main reason behind solid's definite shape?

Garima was reading the newspaper when she suddenly saw the following poster winning the first prize in an event.

The event was most probably organised on:

During the preparation of tea, what is the need to filter tea leaves from tea?

Satyendra Bose had doubts in his mind that, "are changes helpful in life?”. To answer his question, Aristotle asked him to classify following changes into helpful and non-helpful from their perspective. (NA denotes Not Applicable)

1. Farmers harvesting crop

2. Ripening of Fruits

3. Rancidity of food

When a person's clothes catch fire, he or she is wrapped in a thick blanket so as to

The temperature at which a solid gets converted into its liquid state is called its :

Which of the following is a semi-synthetic fibre?

Question 17.1

Explain the following observations very briefly

A firki does not rotate in a closed area.

Subscripts in the chemical formula $A_2{B}_3$ denotes:

(i) 2 atoms of A combine with 3 atoms of B to form $A_2{B}_3$

(ii) The subscript 2 denotes that valency of A is 2.

Which of the following is/are not a property of an acid?

Groundwater replenishment programs are very important to the survival of the Earth and all of its inhabitants. Some communities inject treated wastewater into aquifers:

Which of the above statement(s) is/are incorrect?

In hilly areas, erosion is minimised by

Which of the following term is used for a system with uniform composition and each part with same properties?

A log of wood is burnt to be used in a campfire. Can the burnt wood go back to the original state of clean wood? Why or why not? What kind of change is it? [2 MARKS]

Give reasons for the following. [5 MARKS]
a) People often breathe out on the glasses of their spectacles for cleaning.
b) A bottle of cold water kept outside refrigerator, shows puddle of water around it.
c) Fog is seen in cold winter mornings.

Which of the following is made from coconut husk?

What is difference between matter and atom.

Statements:
All pebbles are stones.
No stone is a diamond.
Some precious are diamonds.
Conclusions:
I. Some pebbles are diamonds.
II. Some stones are precious.

River on its course of flowing shows this separation method:

What impurities are present when you buy wheat,grains and pulses from the market

Dry raisins were soaked in water for 2 hours, to determine the percentage of water absorbed by raisins. Before final weighing of swollen raisins, the extra water left on the surface of soaked raisins was removed by:

Low visibility during cold weather is due to unburnt/partially burnt ___ particles .

Tea leaves are separated from prepared tea by:

Choose the incorrect statement.

Question 19

Paheli mixed flour and water and (a) made a dough, (b) rolled the dough to make a chapatti, (c) baked the chapatti on a pan, (d) dried the chapatti and ground it in a grinder to make powder. Identify the changes (a) to (d) as the changes that can be reversed or that cannot be reversed.

Question 1

Paheli bought some vegetables such as french beans, lady’s finger, green chillies, brinjals and potatoes all mixed in a bag. Which of the following methods of separation would be most appropriate for her to separate them?

(a) Winnowing

(b) Sieving

(c) Threshing

(d) Hand picking