mcq 7 science

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Here are 10 MCQ questions with answers based on the provided image:
1.* Which metal is often mixed with iron to make stainless steel for increased rust resistance?
   a) Copper
   b) Aluminum
   c) Chromium and Nickel
   d) Zinc
   Answer:

2.* What is the primary reason stainless steel is used in applications where rust resistance is critical?
   a) It is lighter than iron.
   b) It conducts electricity better.
   c) It does not rust easily.
   d) It is cheaper to produce.
   Answer: 

 *3.What happens to the exposed surfaces of a brinjal or an apple after being cut and left for some time?
   a) They turn green.
   b) They become darker.
   c) They dry out completely.
   d) They become sticky.
   Answer

 * 4.What substance in the air acts on the chemical substance present in brinjal and apple to cause browning?
   a) Carbon dioxide
   b) Nitrogen
   c) Oxygen
   d) Hydrogen
   Answer:

5.* Is the browning of fruits and vegetables an irreversible chemical change?
   a) Yes, always.
   b) No, it can be prevented.
   c) Only if it's a very dark brown.
   d) It depends on the type of fruit.
   

6 * How can the browning of fruits and vegetables be prevented according to the text?
   a) By exposing them to more air.
   b) By heating them.
   c) By soaking the cut vegetable in water.
   d) By adding salt.
   Answer: 

7.* What is the chemical name for the vinegar used in kitchens?
   a) Citric acid
   b) Acetic acid
   c) Hydrochloric acid
   d) Sulfuric acid
   Answer: 

8.* What is the chemical name for baking soda?
   a) Sodium chloride
   b) Calcium carbonate
   c) Sodium bicarbonate
   d) Potassium hydroxide
   Answer: 

9.* When vinegar and baking soda are mixed, what gas is produced that causes bubbling and a hissing sound?
   a) Oxygen
   b) Nitrogen
   c) Carbon dioxide
   d) Hydrogen
   Answer: 

10.* What happens when carbon dioxide produced from the reaction of vinegar and baking soda comes into contact with lime water?
   a) The lime water turns clear.
   b) The lime water turns milky.
   c) The lime water becomes acidic.
   d) The lime water freezes.
   Answer

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