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Sorting Materials into Groups

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Which of the following materials is completely soluble in water?

  1. Saw dust

  2. Tea leaves

  3. Glucose

  4. Chalk powder

  5. Sand


Correct Option: C
Explanation:

Glucose is completely soluble in water.

Select the odd one out from the options given below.

  1. Gold

  2. Silver

  3. Copper

  4. Bronze

  5. Mercury


Correct Option: E
Explanation:

This is a liquid metal.

Which of the following materials can be called lustrous materials? a. Gold b. Aluminium c. Wood d. Cotton

  1. Only a

  2. Only a and b

  3. Only a and c

  4. Only a and d

  5. All of these


Correct Option: B
Explanation:

This is the correct option because both gold and aluminium are lustrous metals.

There is a list of objects given below. Which of these objects is/are opaque? a. Glass tumbler b. Block of wood c. Granite sheet d. Stainless steel plate

  1. only a and b

  2. only b and c

  3. only c and d

  4. a, b and c

  5. only b, c and d


Correct Option: E
Explanation:

This is the correct answer. All these objects are opaque as you cannot see through these objects.

Miscible liquids are those liquids that mix well with

  1. other liquids

  2. gases

  3. oil

  4. water

  5. liquid non-metals


Correct Option: D
Explanation:

Liquids that mix well with water are called miscible liquids.

Which of the following pairs are translucent?

  1. A mirror and a paper stained with oil

  2. Butter paper and frosted glass

  3. Cardboard and frosted glass

  4. Frosted glass and a mirror

  5. A paper stained with oil and cardboard


Correct Option: B
Explanation:

There are some materials that allow you to see through them, though not very clearly. Such materials are called translucent. Butter paper and frosted glass are both translucent.

Which of the following liquids is immiscible?

  1. Lemon juice

  2. Orange juice

  3. Alcohol

  4. Vinegar

  5. Coconut oil


Correct Option: E
Explanation:

Coconut is an immiscible liquid. It will not mix with water and will float on it.

Which of the following objects will sink in water?

  1. A dry leaf

  2. A piece of driftwood

  3. A wooden plank

  4. An iron nail

  5. Plastic spoon


Correct Option: D
Explanation:

An iron nail will sink in water because the density of iron is more than the density of water. So, even though the iron nail is smaller than a piece of drift wood or a plank, it will sink in water.

Which of the following statements is/are correct?

a. An old copper plate is reddish brown in colour. b. Metal sheets are opaque. c. Ice floats on the surface of water.

  1. Only a

  2. Only b

  3. Only c

  4. Only b and c

  5. All of these


Correct Option: D
Explanation:

Both these statements are correct.

Which of the following liquids is/are transparent? a. Water b. Benzene c. Spirit d. Diesel

  1. Only a and b

  2. Only a and c

  3. Only a and d

  4. Only a, b and c

  5. Only a, c and d


Correct Option: D
Explanation:

This is the correct option. These are all transparent.

Which of the following statements is/are true? a. Objects can be classified on the basis of properties of the materials that they are made from. b. Object made from transparent material allows to easily see through it.
c. Objects through which one cannot see at all are called translucent materials.

  1. Only a

  2. Only b

  3. Only c

  4. Only a and b

  5. Only b and c


Correct Option: D
Explanation:

Both these statements are correct. Thus, this is the correct answer.

Which of the following items is insoluble in water?

  1. Salt

  2. Sugar

  3. Baking soda

  4. Chalk

  5. Baking powder


Correct Option: D
Explanation:

Chalk is insoluble in water.

Which of the following statements is/are incorrect? a. Rubber is a bad conductor of electricity. b. Wax floats on oil. c. Ice floats on oil.

  1. Only a

  2. Only b

  3. Only c

  4. Only a and b

  5. Only b and c


Correct Option: B
Explanation:

This statement is incorrect. Wax floats on water but sinks in oil.

Which of the following statements is/are incorrect? a. Iodine crystals have lustre. b. All metals have a silvery white lustre. c. Gases are non-lustrous.

  1. Only a

  2. Only b

  3. Only c

  4. Only a and c

  5. Only a and b


Correct Option: B
Explanation:

All metals have a silvery white lustre. This is not correct. Gold has a yellow lustre and copper has a reddish brown lustre.

Which of the following gases are slightly soluble in water? a. Nitrogen b. Oxygen c. Hydrogen d. Carbon monoxide e. Carbon dioxide

  1. Only a, b and c

  2. Only b, c and d

  3. Only c, d and e

  4. Only a, c and e

  5. Only b and e


Correct Option: E
Explanation:

Oxygen and carbon dioxide are slightly soluble in water. Rest are insoluble in water.

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