Question

Choose the correct one:-
1. A SOLUTION IN WHICH SOME MORE SOLUTE CAN BE DISSOLVED AT A FIXED TEMPERATURE IS CALLED:
- a) saturated solution
b) homogeneous solution
c) unsaturated solution
2. EVAPORATION AND CONDENSATION ARE USED TO SEPARATE
a) insoluble solids from liquids
b) soluble solids from liquids
c) immiscible liquids
d) solids from other solids
3. SELECT AN INCORRECT REASON FOR SEPARATING COMPONENETS OF A MIXTURE:-
a) to obtain pure sample of a substance
b) to separate two or more different but useful components
c) to remove undesirable and useless components
d) to remove pure or harmless components
4. DIVYA BOUGHT SOME VEGETABLES SUCH A FRENCH BEANS, LADY'S FINGER, GREEN CHILLIES, BRINJALS AND POTATOES ALL MIXED IN A BAG. WHICH OF THE FOLLOWING METHODS OF SEPARATION WOULD BE MOST APPROPRIATE FOR HER TO SEPARATE THEM?
a) hand picking
b) sieving
c) winnowing
d) threshing
5. WHICH AMONGST THE FOLLOWING METHODS WOULD BE MOST APPROPRIATE TO SEPARATE GRAINS FROM BUNDLES OF STALKS? a) hand picking
b) sieving
c) winnowing
d) threshing
6. WINNOWING IS HELPFUL ONLY WHEN
a) two solids have different weights
b) two solids have different boiling points
c) two solids have different melting points
d) two solids have different magnetic properties
7. IN A ACTIVITY, A TEACHER DISSOLVED A SMALL AMOUNT OF SOLID COPPER SULPHATE IN A TUMBLER HALF-FILLED WITH WATER. WHICH METHOD WOULD YOU USE TO GET BACK SOLID COPPER SULPHATE FROM THE SOLUTION?
a) evaporation
b) condensation
c) sedimentation
d) decantation
8. KAREENA DISSOLVES LOTS OF SUGAR IN MILK. SHE ADDED MORE BUT IT WOULD NOT DISSOLVES. WHY?
a) because it is too think
b) because it is saturated
c) because it is unsaturated
d) because it has become too sweet
9. IN WHICH OF THESE GROUPS ARE ALL THE ITEMS TRANSPARENT?
a) wood, steel plate ,brick
b) mirror, air, steel plate
c) water, mirror, spectacles
d) water, air, spectacles
10. SALT CAN BE SEPARATED FROM BRINE SOLUTION BY
a) sieving
b) filtration
c) evaporation
d) all of these

Answer 1

1. a) Saturated Solution

2.a) Insoluble solids from liquids

3.d) To remove pure or harmless components

4.a) Hand-picking

5.d) Threshing

6.a) Two solids have different weights

7.a) Evaporation

8.b) Because it is saturated

9.d) water, air, spectacles

10.c) evaporation

These are the answers to my knowledge. Hope this helps : )

Answer 2

Answer:

1. a)

2. b)

3. d)

4. a)

5. c)

6. a)

7. a)

8. b)

9. d)

10. c)

Explanation: