10 MCQs based on the table of colloids (Dispersed phase, Dispersion medium, Type, Example) — without answers as you requested:
MCQs – Colloids (Based on Table 2.1)
(No Answers)
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When a liquid is dispersed in a gas, the colloid formed is called:
a) Foam
b) Aerosol
c) Sol
d) Gel -
Fog, clouds, and mist are examples of which type of colloid?
a) Foam
b) Sol
c) Aerosol
d) Emulsion -
When a gas is dispersed in a liquid, the type of colloid formed is:
a) Aerosol
b) Foam
c) Emulsion
d) Gel -
Shaving cream is an example of:
a) Sol
b) Foam
c) Gel
d) Emulsion -
Which combination produces a sol?
a) Liquid in solid
b) Solid in liquid
c) Gas in solid
d) Liquid in gas -
Milk is an example of which type of colloid?
a) Aerosol
b) Foam
c) Emulsion
d) Gel -
A solid dispersed in a solid forms which type of colloid?
a) Sol
b) Gel
c) Solid sol
d) Foam -
Jelly, cheese, and butter are examples of:
a) Gel
b) Sol
c) Foam
d) Emulsion -
Smoke and automobile exhaust represent which colloid type?
a) Foam
b) Aerosol
c) Emulsion
d) Gel -
Mud and milk of magnesia are examples of:
a) Emulsion
b) Gel
c) Sol
d) Solid sol
Here are the answers to the MCQs on Colloids (Table 2.1 – Class 12 Solutions Chapter):
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✅ Answer Key
1. b) Aerosol
2. c) Aerosol
3. b) Foam
4. b) Foam
5. b) Solid in liquid
6. c) Emulsion
7. c) Solid sol
8. a) Gel
9. b) Aerosol
10. c) Sol
Here are 20 MCQs based on Improvement in Food Resources – Class 9 Science (NCERT).
⭐ 20 MCQs – Improvement in Food Resources
(No answers included unless you want them)
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1. Which of the following is NOT a macronutrient required by plants?
a) Nitrogen
b) Phosphorus
c) Potassium
d) Iron
2. Growing two or more crops on the same field at the same time is called:
a) Mixed farming
b) Mixed cropping
c) Crop rotation
d) Intercropping
3. The practice of supplying water to crops at regular intervals is known as:
a) Leaching
b) Manuring
c) Irrigation
d) Weeding
4. HYV seeds are developed for:
a) Higher resistance
b) High yield
c) Less water requirement
d) Early flowering
5. The unwanted plants that grow along with crops are called:
a) Crops
b) Pests
c) Weeds
d) Insects
6. Which method is best for removing weeds?
a) Spraying insecticides
b) Tilling
c) Harvesting
d) Milling
7. The process of loosening and turning of soil is called:
a) Weeding
b) Ploughing
c) Sowing
d) Threshing
8. Manure is prepared by the decomposition of:
a) Plastics
b) Animal and plant waste
c) Glass pieces
d) Cement
9. Which one is a biofertilizer?
a) Urea
b) Compost
c) Rhizobium
d) Superphosphate
10. Cattle husbandry deals with:
a) Sheep and goats
b) Cows and buffaloes
c) Poultry birds
d) Fishes
11. Which of the following is a marine fish?
a) Catla
b) Rohu
c) Hilsa
d) Mrigal
12. Apiculture refers to:
a) Fish farming
b) Growing bees for honey
c) Silkworm rearing
d) Goat farming
13. The variety of crops grown to increase soil fertility is:
a) Wheat
b) Paddy
c) Legumes
d) Cotton
14. Which one is a chemical fertilizer?
a) Compost
b) Green manure
c) Vermicompost
d) Urea
15. The method of breeding fish in ponds is called:
a) Inland fishing
b) Marine fishing
c) Poultry
d) Apiculture
16. Pests can be controlled by:
a) Manures
b) Fertilizers
c) Pesticides
d) Tillage
17. A common disease in poultry birds is:
a) Anthrax
b) Ranikhet
c) Foot rot
d) Blight
18. Varieties of crops resistant to diseases are developed by:
a) Irrigation
b) Manuring
c) Plant breeding
d) Tilling
19. The main reason for using fertilizers is:
a) Kill insects
b) Increase soil nutrients
c) Increase water content
d) Reduce weeds
20. Which of the following increases soil fertility naturally?
a) Paddy
b) Leguminous plants
c) Wheat
d) Cotton
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Here is the Answer Key for the 20 MCQs from Improvement in Food Resources – Class 9:
⭐ Answer Key
1. d) Iron
2. b) Mixed cropping
3. c) Irrigation
4. b) High yield
5. c) Weeds
6. b) Tilling
7. b) Ploughing
8. b) Animal and plant waste
9. c) Rhizobium
10. b) Cows and buffaloes
11. c) Hilsa
12. b) Growing bees for honey
13. c) Legumes
14. d) Urea
15. a) Inland fishing
16. c) Pesticides
17. b) Ranikhet
18. c) Plant breeding
19. b) Increase soil nutrients
20. b) Leguminous plants
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Here are 5 numerical-based questions on calculating average atomic mass of isotopes (Class 9 level):
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⭐ 5 Questions – Average Atomic Mass (Isotopes)
(No answers unless you ask)
1. Chlorine has two isotopes:
Cl-35 (75%) and Cl-37 (25%).
Calculate the average atomic mass of chlorine.
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2. Hydrogen has three isotopes:
H-1 (99.9%), H-2 (0.015%), and H-3 (0.0001%).
Find the average atomic mass of hydrogen.
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3. Copper has two isotopes:
Cu-63 (69%) and Cu-65 (31%).
Calculate the average atomic mass of copper.
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4. Magnesium has three isotopes:
Mg-24 (79%), Mg-25 (10%), Mg-26 (11%).
Calculate the average atomic mass of magnesium.
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5. Boron has two isotopes:
B-10 (20%) and B-11 (80%).
Find the average atomic mass of boron.
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If you want, I can also send the solutions, formula, or extra questions for practice.
Here are the answers (with simple calculations) for all 5 questions on average atomic mass of isotopes:
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⭐ Answer Key – Average Atomic Mass
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1. Chlorine
Isotopes: Cl-35 (75%), Cl-37 (25%)
Average atomic mass
= (35 × 0.75) + (37 × 0.25)
= 26.25 + 9.25
= 35.5 u
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2. Hydrogen
H-1 (99.9%), H-2 (0.015%), H-3 (0.0001%)
Average atomic mass
= (1 × 0.999) + (2 × 0.00015) + (3 × 0.000001)
≈ 1.0002 u
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3. Copper
Cu-63 (69%), Cu-65 (31%)
Average atomic mass
= (63 × 0.69) + (65 × 0.31)
= 43.47 + 20.15
= 63.62 u
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4. Magnesium
Mg-24 (79%), Mg-25 (10%), Mg-26 (11%)
Average atomic mass
= (24 × 0.79) + (25 × 0.10) + (26 × 0.11)
= 18.96 + 2.5 + 2.86
= 24.32 u
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5. Boron
B-10 (20%), B-11 (80%)
Average atomic mass
= (10 × 0.20) + (11 × 0.80)
= 2 + 8.8
= 10.8 u
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If you want, I can also give you:
✔ extra practice questions
✔ a worksheet
✔ formula explanation in simple steps
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