West Bengal Class 6 English Medium Science Solution Chapter 2 Phenomena Around Us
On this Page we have given West Bengal Class 6 English Medium Science Solution Chapter 2 Phenomena Around Us Question and Answer for our Students of West bengal Class 6 English Medium. Hope this following Question Answer will help our Students.
(1) Write the answers of the following.
(1) Definition of phenomenon?
→A thing or being, event or process, perceptible through senses; OrA fact or occurrence thereof.
(2) How many Types of phenomena?
→There are six types of phenomena.
(3) Write the types of phenomena?
→(1) Reversible & Irreversible
(2) Periodic & Non-periodic
(3) Desirable & Undesirable
(4) Natural & Man-made
(5) Slow & Fast
(6) Physical & Chemical change
(2) Short Answer Questions.
(1) Which phenomenon is reversible & which one is irreversible?
→ Reversible: – Melting of Ice into water, Vaporization of water.
Irreversible: – heating sugar, boiling rice.
(2) Which phenomenon is periodic & which one is non-periodic?
→Periodic: – Day turn into night, leap year, movements of hands of clock,
Non-periodic: – Flood, Cars moving on a road.
(3) Which phenomenon is natural & which one is man-made?
→ Natural: – Flood due to heavy rain, frogs & birds eating the Insects,
Man-made: – Flood due to water released from dam,
Killing of harmful pests & insects by pesticides, creating pollution.
(4) Which one is physical change & which one is chemical change?
→ Physical Change: – Water melting into ice, making curd from milk.
Chemical change: – Colour change of tree leaves, burning of fire Crackers.
(5) When apple or banana or potato is cut & left for some time, what Happens? Which changes is this?
→ When apple, banana, potato is cut & left for some time, the colour Change into black. Chemical change is that.
(6) Define fast & slow phenomenon?
→ The phenomenon which happens quickly is known as fast. The phenomenon which takes a lot of time to happen or Happens gradually is called slow phenomenon.
(7) On the mouth of a bottle a metal lid has got tightly stuck. What Will you do?
→You will heat the metallic lid of the bottle carefully in fire. Then the Metal lid will increase in size and become loose.
(8) Give at list 2 examples for reversible physical changes and Irreversible physical changes?
→Reversible: – Formation of vapour from water, dissolution of Salt in water.
Irreversible: – Glassware breaking into pieces, flour made from Wheat.
(9) Natural & Man-made Phenomena?
Phenomena | Natural | Man-made | ||
Phenomena | How can it occur | Phenomena | How can it occur | |
Lighting fire | Sometimes tree in the forest catch fire, which is known as forest-fire | Rubbing of dry twigs | We light a fire for cooking | Due to careless attitude of humans |
Flood | Sudden heavy rain | Reduced retention capacity of riverbed | If the stored water of a dam is released | Release of water to save the dam |
Death of wild animal | Natural death | Killed by poachers | ||
Killing of harmful pests and insects | Frogs or birds eat the insects which destroy food grains | Insects killed by spraying pesticides |