Que - 1 Write the name of the synthetic fiber having the following properties. (5)
1. It is strong, elastic and light. It is lustrous and easy to wash. So it becomes very
popular for making clothes.
2. Made from wood pulp and woven sheet with cotton and woven mat with wool.
3. The fabric made from this fiber does not crumble easily, it stay tight and easy to
wash so it’s useful in making wearable fabrics.
4. Useful in making sweaters cheaper than wool.
5. Thin fibers can be made of it and can be woven like any other thread.
L.O. Applies learned scientific concepts in daily life.
Que -2 Answer the following question.
1. 50 kg wheat has been brought to your house. What will you do to take care of it? (2)
2. Explain where and why metallic material (any one) and non- metallic material (any
one) have been used in your home.
(2)
3. Which agriculture tool would you choose to sow seeds in the field? (1)
L.O. Illustrates the process and the phenomenon.
Que - 3 Answer the following questions.
1. Explain the process of harvesting. (2)
2. When you add water to sulfur dioxide and put a blue litmus paper in it, why does it
turn red?
(1)
3. When we put burning candle near the mouth of test tube consisting of sulfuric acid &
pieces of magnesium metal, why does it explode?
(1)
4. Why do the colour & solution of copper sulphate change when we take a solution of
copper sulphate in a beaker and put an iron nail in it?
(1)
L.O. Connects process and event with cause.
Que – 4 Give reasons.
1. Why are infants and children vaccinated? (2)
2. We should not allow water to collect in one place around us for a long time to
prevent malaria.
(2)
3. The drip irrigation method is a boon in area with water scarcity.
(1)
L.O. Carries out a simple investigation to get answer to the questions.
Que - 5 Answer the following question.
1. Make a note of what methods have been used to store food in your home for a long
time.
(3)
2. How will you determine if harmful micro organisms are produced in bread or fruit?
Answers
Answer:
I can't understood what you are asking
Answer:
1. Silk (I think)
2. Rayon
3. Nylon
4. Acrylic
5. Terylene
Q2
I don't know
I don't know
3. Seed Drill
Q3
1. Harvesting is the process of gathering a ripe crop from the fields. Reaping is the cutting of grain or pulse for harvest, typically using a scythe, sickle, or reaper. On smaller farms with minimal mechanization, harvesting is the most labor-intensive activity of the growing season. On large mechanized farms, harvesting utilizes the most expensive and sophisticated farm machinery, such as the combine harvester. Process automation has increased the efficiency of both the seeding and harvesting processes. Specialized harvesting equipment utilizing conveyor belts to mimic gentle gripping and mass transport replaces the manual task of removing each seedling by hand. The term "harvesting" in general usage may include immediate postharvest handling, including cleaning, sorting, packing, and cooling.
2. Sulphur dioxide reacts to the addition of water, becoming acidic, that is an acid solution .It is then correctly names sulphuric acid.it Will change the blue litmus paper to red , but if the litmus paper is red to begin with, the colour doesn't change
3. Magnesium and sulfuric acid react to give magnesium sulfate and hydrogen gas.
The reaction is:
Mg(s) + H₂SO₄(aq) -------> MgSO4(aq) + H₂(g)
When a burning candle is brought near the mouth of a test tube containing hydrogen, it explodes with a pop sound.
4. When an iron nail immersed in the solution of copper sulphate than iron displaces copper from the solution of copper sulphate because iron is more reactive than copper. Therefore copper sulphate solution colour changes from blue to pale green.
Q4
1. Vaccines help protect infants, children, and teens from serious diseases. Getting childhood vaccines means your child can develop immunity (protection) against diseases before they come into contact with them.
2. Reason to avoid water collection to prevent malaria is vector borne disease caused by parasitic plasmodium. Plasmodium is carried into human through mosquito. The mosquito responsible is female Anopheles mosquito it usually grows in diver and transports through blood
Explanation:
I'm sorry that I didn't answer all of your questions, but that would take alot of time and 5 points isn't worth enough for my tme