National Science Olympiad Forum By SOF Olympiad Trainer - Page 123

User Forum

Subject :NSO    Class : Class 3

Refer to the given conversation among three friends who are going to a market.
Shruti : I want to have banana shake today. Mumma has asked me to get some bananas.
Meetu : I have to buy some tomatoes for soup.
Nidhi : My brother has cut his finger. I have to get a band-aid.
Select the correct option regarding this.

AShruti should go to a greengrocer.
BMeetu should go to a greengrocer.
CNidhi should go to a chemist.
DAll of these


Post Your Answer

Subject :NSO    Class : Class 2

Post Your Answer

Subject :NSO    Class : Class 6

Air pollution on the road can be reduced by _____.

AIncreasing the number of vehicles on the road
BDeforestation
CEncouraging the use of CNG in vehicles
DAll of these


Air pollution on the road can be reduced by encouraging the use of CNG in vehicles. When used in vehicles as fuel, CNG produces fewer undesirable gases than petrol, diesel or propane. If we increase the number of vehicles on the road, then they will emit more of carbon emissions and smoke. This would cause more air pollution.Deforestation means cutting down trees and forests. Trees absorb harmful carbon dioxide from the air. If trees are cut down, they would not be able to absorb carbon dioxide, so carbon dioxide levels in air would go up. This would cause more air pollution. Hence, Option C is the correct answer.

Ans 1:

Class : Class 3
Air pollution on the road can be reduced by encouraging the use of CNG in vehicles. When used in vehicles as fuel, CNG produces fewer undesirable gases than petrol, diesel or propane. If we increase the number of vehicles on the road, then they will emit more of carbon emissions and smoke. This would cause more air pollution.Deforestation means cutting down trees and forests. Trees absorb harmful carbon dioxide from the air. If trees are cut down, they would not be able to absorb carbon dioxide, so carbon dioxide levels in air would go up. This would cause more air pollution. Hence, Option C is the correct answer.

Post Your Answer

Subject :NSO    Class : Class 6

Following are the arrangement of molecules in three different states of matter.



Which of the above diagrams represents the arrangement in a cold drink?

AI
BII
CIII
DAll of the above.


In I, the particles are packed tightly together with no space between them. That means I is Solid. In II, the particles are loosely packed together with some space between them. That means II is Liquid. In III, the particles are loose and have lots of space between them. That mean III is Gas.Cold Drink is a Liquid. That means II represents arrangements of its particles.Hence, Option B is the right answer.

Post Your Answer

Subject :NSO    Class : Class 6

Which of the following changes can be reversed?
(1) Curd into milk
(2) Ice into water
(3) Blowing of a balloon
(4) Cutting of trees

A(1) and (2)
B(2) and (3)
C(3) and (4)
D(2), (3) and (4)


Let’s see which of the following changes can be reversed:(1) Curd into milk ----- Curd cannot be changed back to Milk.(2) Ice into water ----- If Ice is left at normal temperature for some time, it will melt into water.(3) Blowing of a balloon ----- If we blow a balloon, but don’t tie its mouth, the air will escape from the balloon, and it will get back to its previous shape.(4) Cutting of trees ----- Once a tree is cut down, it cannot be put back together as a whole tree again.

Post Your Answer

Subject :NSO    Class : Class 8

Post Your Answer

Subject :NSO    Class : Class 6

The method of converting decaying organic waste into manure using red worms is

AVermicomposting
BComposting
CDecaying
DRecycling.


Let’s see what the process given in the options mean:A. Vermicomposting ----- Vermicomposting is a composting process in which various worms, usually red wigglers, white worms, and other earthworms, etc., create a mixture of decomposing vegetable or food waste.B. Composting ----- Composting is the process of decomposing organic solid wastes. It can be used to recycle organic material into a humus-like material, known as compost, which is a good fertilizer for plants.C. Decaying ----- When organic material decomposes through the action of bacteria and fungi, it is called Delaying.D. Recycling ----- Recycling is the process of collecting and processing materials, that would otherwise be thrown away like trash, and turning them into new products.That means the method of converting decaying organic waste into manure using red worms is Vermicomposting.Hence, the right answer is Option A.

Ans 1:

Class : Class 3
Let’s see what the process given in the options mean:A. Vermicomposting ----- Vermicomposting is a composting process in which various species of worms, usually red wigglers, white worms, and other earthworms, etc., are to create a mixture of decomposing vegetable or food waste.B. Composting ----- Composting is the process of decomposing organic solid wastes. It can be used to recycle organic material into a humus-like material, known as compost, which is a good fertilizer for plants.C. Decaying ----- When organic material decomposes through the action of bacteria and fungi, it is called Delaying.D. Recycling ----- Recycling is the process of collecting and processing materials, that would otherwise be thrown away as trash, and turning them into new products.That means the method of converting decaying organic waste into manure using red worms is Vermicomposting.Hence, the right answer is Option A.

Post Your Answer

Subject :NSO    Class : Class 1

Post Your Answer

Subject :NSO    Class : Class 1

Ans 1:

Class :

Post Your Answer

Subject :NSO    Class : Class 6

Post Your Answer