To prevent the evaporation of water from lakes __________ is sprayed on the
surface of water
Cetyl alchol
100
As sunlight passes through a prism it gets divided into 7 colours of which the _____ colour is at the top
red
100
Name three ways in which heat is transferred
Conduction
Convection
Radiation
100
Name one female member of the constituent assembly
Sarojini Naidu
200
What are natural resources?
Air, water, plants, animals and soil take care of all our needs. These are all from nature and are called NATURAL RESOURCES.??
Natural – From nature?
Resources – Things or materials
200
What are the three forms in which water is found?
liquid
solid
gaseous
200
A ________ can break the sunlight into a spectrum of seven colours
prism
200
What is temperature? How do we measure it?
Temperature is an indicator of heat in a substance
Thermometer is used to measure temperature
200
On which day did India started to run according to the Constitution?
26th January, 1950
300
Why vehicles in Bombay and Delhi are now using CNG?
to reduce air pollution.
300
What is ground water?
The flowing water in rivulets, streams, rivers seeps into the ground. Due to this, underground reserves of water are formed. This water is called ground water.
300
Why is the penumbra faint?
because in the region of the penumbra some light rays are present while in the region of the umbra no light rays are present
300
Why is a medium necessary for conduction?
Conduction takes place by vibration of particles.
Particles are only present in a medium
Therefore, a medium is necessary for conduction
300
What is the Constitution?
Constitution is a book that has all the rules to run a country
In a country, the people choose the government
Constitution tells us what the people can do and what the government can do
400
How do we protect soil?
1. We should plant trees and not cut them.?
2. We should use organic insecticides.?
3. We should use methods like sprinkle and drip irrigation.
400
Match the column
Potable Water
Chlorination
400
Why does an object cast a shadow on the screen?
because the light rays, which travel in a straight line, do not reach the part of the screen behind the object. Hence, this part remains dark and a shadow is cast.
400
What are good conductors and bad conductors of heat? Give examples
Good conductors - Substances through which heat travels easily and quickly
example - iron, copper
Bad conductors - Substances through which heat travels very slowly
examples - plastic, wood
400
Why is Dr. Babasaheb Ambedkar known as the ‘Architect of the Constitution of India.’?
He was the chairman of the Drafting group.
He knew about a lot of constitutions of countries from all over the world.
He worked day and night to prepare the rough copy constitution.
All the suggestions and improvements were put in the final copy of the constitution by Dr. Ambedkar
500
Soil contains Nutritious elements that help crops to grow. But soil is getting polluted by:?
1. Over use of chemical fertilisers?
2. Polluted water from factories.?
3. Over use of insecticides.
?4. Over use of water.??
500
why is piped water costly?
because the government spends a lot of money on the storage, filtration, chlorination of water and on supplying the water to our houses
500
Why does an aeroplane or a bird does not cast a shadow on the earth?
surface of the earth is far away from them, so the umbra completely disappears. so, no shadow is cast
500
Explain on board, with diagram land breeze and sea breeze
answer
500
explain the value of Fraternity accepted by the constitution
This value means that all the people in the country are like brothers and sisters and we live together peacefully