Chapter 5 -
Objects Around Us (āĻāĻŽাā§° āĻৌāĻĒাāĻļā§° āĻŦāϏ্āϤুāĻŦোā§°)
āĻļুāĻĻ্āϧ āĻāϤ্āϤ⧰āĻŦোā§° (MCQ Answers):
1. āĻļুāĻĻ্āϧ āĻāϤ্āϤ⧰⧰ āĻোāϞāĻো āϏāĻŽ্āĻĒূāϰ্āĻŖ āĻĒূā§° āĻā§°া।
(i) āĻĻ্āϰāĻŦ্āϝāĻ āϝি āĻĒā§°িāĻŽাāĻŖā§° āĻ াāĻ āĻāĻুā§°ি āĻĨাāĻে āϤাāĻ āĻি āĻŦুāϞি āĻোā§ąা āĻšā§?
āĻāϤ্āϤ⧰: (c) āĻā§āϤāύ
(ii) āϤāϞ⧰ āĻোāύāĻŦিāϧ āϏ্āĻŦāĻ্āĻ?
āĻāϤ্āϤ⧰: (b) āĻাāĻ
(iii) āϤāϞ⧰ āĻোāύāĻŦিāϧ āĻ āϰ্āϧāϏ্āĻŦāĻ্āĻ।
āĻāϤ্āϤ⧰: (c) āϤেāϞāϏāύা āĻাāĻāĻ
(iv) āϤāϞ⧰ āĻোāĻāĻোā§° āĻĒā§°া āĻ āĻŽিāϞāĻো āĻŦাāĻি āĻāϞিāĻā§ąা।
āĻāϤ্āϤ⧰: (d) āĻŦাঁāĻš
● āĻুāύ
● āϏোāĻĄা
● āĻŦā§°াāĻ
● āĻŽāĻāĻŦুāϤ
● āĻĻীāĻāϞীā§া āϏāĻŽā§ āϧ⧰ি āĻিāĻি āĻĨাāĻিāĻŦ āĻĒাā§°ে (āĻĻীāϰ্āĻāϏ্āĻĨাā§ী)
● āĻĒā§°িāϏ্āĻাā§° ā§°ূāĻĒāϤ āĻāĻাā§° āĻĻিāĻŦ āĻĒā§°া āϝাā§
● āύিāĻŽāĻ
● āύেāĻŽুā§° ā§°āϏ
● āĻĒাāύীāϤ āĻŽিāĻšāϞি āύāĻšā§ (āĻ āĻĻ্ā§°āĻŦāĻŖীā§ āĻŦāϏ্āϤু):
● āĻŦাāϞি
Additional Question-Answer (Based on Given Text)
(1) āĻŦāϏ্āϤু āĻā§°ু āĻĒāĻĻাā§°্āĻĨā§° āĻŽাāĻāϤ āĻি āĻĒাā§°্āĻĨāĻ্āϝ āĻāĻে?
āĻāϤ্āϤ⧰: āĻĒāĻĻাā§°্āĻĨ āĻšৈāĻে āϝিāĻোāύো āĻŦāϏ্āϤু āĻāĻ āύ āĻā§°া āĻŽৌāϞিāĻ āĻāĻāĻ, āϝেāύে āϞোāĻšা, āϤাāĻŽ, āĻāϞ।
āĻŦāϏ্āϤু āĻšৈāĻে āĻāĻ āĻĒāĻĻাā§°্āĻĨāĻŦোā§°েā§°ে āϤৈā§াā§° āĻšোā§ąা āĻŦāϏ্āϤু, āϝেāύে āĻেāĻŦুāϞ, āĻŦāĻāϞ, āĻিāϞাāĻ।
(2) āĻĒাāύীāϤ āĻĻ্āϰāĻŦāĻŖীā§ āĻŦāϏ্āϤু āĻā§°ু āĻ āĻĻ্āϰāĻŦāĻŖীā§ āĻŦāϏ্āϤুā§° āϤাāϞিāĻা āĻĻিā§া।
āĻāϤ্āϤ⧰: āĻĒাāύীāϤ āĻĻ্āϰāĻŦāĻŖীā§:
● āĻেāύি
● āύিāĻŽāĻ
● āĻŽৌ
āĻĒাāύীāϤ āĻ āĻĻ্āϰāĻŦāĻŖীā§:
● āĻŦাāϞি
● āĻāĻā§° āĻুā§ি
● āύাā§°িāĻāϞ⧰ āϤেāϞ
(3) āϏ্āĻŦāĻ্āĻ, āĻ āϏ্āĻŦāĻ্āĻ āĻā§°ু āĻ āϰ্āϧāϏ্āĻŦāĻ্āĻ āĻŦāϏ্āϤুā§° āĻĒ্ā§°āϤ্āϝেāĻā§° āĻāĻা āĻāĻĻাāĻšā§°āĻŖ āĻĻিā§া।
āĻāϤ্āϤ⧰: āϏ্āĻŦāĻ্āĻ: āĻাāĻ
āĻ āϰ্āϧāϏ্āĻŦāĻ্āĻ: āϤেāϞāϏāύা āĻাāĻāĻ
āĻ āϏ্āĻŦāĻ্āĻ: āĻাāĻ
(4) āĻিāĻুāĻŽাāύ āĻŦāϏ্āϤু āĻĒাāύীāϤ āĻāĻĒāĻে, āĻিāĻুāĻŽাāύ āĻĄুāĻŦ āϝাāϝ় — āĻাā§°āĻŖ āĻি?
āĻāϤ্āϤ⧰: āĻĒাāύীāϤ āĻāĻĒāĻা āĻŦāϏ্āϤুāĻŦোā§°ā§° āĻāύāϤ্āĻŦ āĻĒাāύীā§° āϤুāϞāύাāϤ āĻāĻŽ āĻĨাāĻে।
āϝিāĻŦোā§° āĻŦāϏ্āϤু āĻĒাāύীāϤ āĻĄুāĻŦ āϝাāϝ়, āϏেāĻāĻŦোā§°ā§° āĻāύāϤ্āĻŦ āĻ āϧিāĻ āĻšāϝ়।
(5) āĻিāϞাāĻ āĻŦāύাāĻŦāϞৈ āĻŦ্āĻ¯ā§ąāĻšৃāϤ āĻĒāĻĻাā§°্āĻĨāĻŦোā§°ā§° āύাāĻŽ āϞিāĻা।
āĻāϤ্āϤ⧰:
● āĻŦাāϞি
● āĻুāύ
● āϏোāĻĄা
● āĻাāĻ
● āĻুāύাāĻĒাāĻĨā§°
(6) āĻি āϧ⧰āĻŖā§° āĻĒāĻĻাā§°্āĻĨā§° āĻĒā§°া āĻ্āϝোāϤি āĻā§āĻĒāύ্āύ āĻšā§?
āĻāϤ্āϤ⧰: āĻ্āϝোāϤিāĻŽাāύ āĻĒāĻĻাā§°্āĻĨ, āϝেāύে āĻŦাāϞ্āĻŦ, āϏূā§°্āϝ āĻ āĻāϞোāĻ āĻā§āĻĒāύ্āύ āĻā§°ে।
(7) āύিāĻā§° āĻŦāϏ্āϤুāĻŦোā§°ā§° āĻĒā§°া āĻি āĻি āϤৈā§াā§° āĻšā§? āĻŽিāϞাāĻ —
āĻŦāϏ্āϤু āϤৈā§াā§° āĻā§°া āĻĒāĻĻাā§°্āĻĨ
āĻোāĻা āĻŦāĻšী āĻাāĻāĻ
āĻāĻাāϞ āϞো
āĻāĻী āĻাāĻ
āĻিāϞাāĻ āĻাāĻ
āϏূāϤা āĻāĻĒাāĻš
(8) āĻĒ্āϞাāώ্āĻিāĻā§° āĻĒā§°া āϤৈā§াā§° āĻĒাঁāĻāĻŦিāϧ āĻŦāϏ্āϤু:
āĻāϤ্āϤ⧰:
● āĻŦাāĻ
● āĻŦāĻāϞ
● āĻেāϞāύা
● āĻŦাāϞ্āĻি
● āĻাāĻি
Chapter - 5
Separation of Substances
Exercises (āĻ āύুāĻļীāϞāύী)
1. Why do we need to separate different components of a mixture? Give two examples.
Ans:- The elements in the mixture need to be separated, because-
1) Non-use material has to be removed.
2) Impurities or harmful elements have to be removed.
Example- Removing stones from rice,
Milk churning to separate butter.
2. what is winnowing? Where is it used?
Ans:- The method of separating the heavy and light components in a mixture by flowing into the air or air is called the process of harvesting.
This method is used to separate the thin rash or bark of heavy seeds (seeds) of the crop.
3. How will you separate husk or dirt particles from a given sample of pulses before cooking.
Ans:- The bark or mold particles in the dal bought from the shop are washed with water before cooking, so that the impurities mixed with it, such as the soil roots and the dust, are separated. This process is known as the process of asraban.
4. What is sieving? Where is it used?
Ans:- In the sieve process, the fine grains in a mixture are pierced with holes and large size impurities remain in the sieve.
The process of running the sieve is applied when the ingredients of the mixture are different in size. For example the process of running a sieve is used to separate the stones from the sand while building a house.
5. How will you separate sand and water from their mixture?
Ans:- If the water mixed with the sand is left in a single vessel for some time without stirring it, the sand will be deposited in the bottom of the utensil. (Sedimentation process)
6. Is it possible to separate sugar mixed with wheat flour? If yes, how will you do it?
Ans:- It is possible to separate the sugar mixed with the flour powder. In this case we should use sieves. Due to the smaller lumps of the flour, the sieve rolls down and remains in the sieve as the sugar grains are larger.
7. How would you obtain clear water from a sample of muddy water?
Ans:- If the murky water is left in a vessel for a while without moving it, the bark or such substance accumulates in the bottom of the water. (Sedimentation process)
If the water is not cleaned by the sedimentation process, the water can be cleaned using a small hole ing squirrel. (Filtration process)
8. Fill up the blanks
(a) The method of separating seeds of paddy from its stalks is called ---------------
Ans:- Dying.
(b) When milk, cooled after boiling, is poured onto a piece of cloth the cream (maim) is left behind on it. This process of separating cream from milk is an example of -----------------
Ans:- The process of filtration.
(c) Salt is obtained from seawater by the process of ------------------
Ans:- Evaporation.
(d) Impurities settled at the bottom when muddy water was kept overnight in a bucket. The example is called ----------------
Ans:- Filtration
9. True or False?
(a) A mixture of milk and water can be separated by filtration.
Ans:- False.
(b) A mixture of powdered salt and sugar can be separated by the process of winnowing.
Ans:- False.
(c) Separations of sugar from tea can be done with filtration.
Ans:- False.
(d) Grain and husk can be separated with the process of decantation.
Ans:- False.
10. Lemonade is prepared by mixing lemon juice and sugar in water. You wish to add ice to cool it. Should you add ice to the lemonade before or after dissolving sugar? In which case would it be possible to dissolve more sugar?
Ans:- Lemon juice and sugar are mixed with water and made in lemon syrup. Ice is added to this syrup to cool it down. The ice should be given after dissolving the sugar.
Answer by:- Sourabh Bora
Check by - Mukesh Borah