guys please give me some MCQ based questions of chemistry class 8 with answers
please any teacher please help me
Answers
Answer:
1. Plastic wire is
a. An insulator
b. A conductor
c. Both of these
d. None of these
2. Electroplating is based on
a. Magnetic effect of electricity
b. Chemical effect of electricity
c. Heating effect of electricity
d. Physical effect of electricity
3. Adding common salt to distilled water makes it
a. Good conductor
b. Insulator
c. No
d. Both a and b
4. An electrolyte is
a. a metal
b. a solution
c. a liquid that conducts current
d. all of above
5. Copper wire is a
a. Good conductor
b. Poor conductor
c. Both a and b
d. None of this
6. Poor conductors are
a. Plastics
b. Clothes
c. Wood
d. All of these
7. Distilled water is
a. Poor conductor
b. Good conductor
c. Both a and b
d. None
8. Flow of electron is called
a. Electroplating
b. Electric current
c. Electrodes
d. Electrolyte
9. Electroplating prevents
a. Current
b. Chemical effect
c. Rusting
d. All
10. An electric lamp glows due to
a. Chemical effect
b. Magnetic effect
c. Heating effect
d. None
Answers:
1. A
2. B
3. A
4. C
5. A
6. D
7. A
8. B
9. C
10. C
1. Which substance give heat and light after combustion
a. Flame
b. Fuel
c. Combustion
d. None of these
2. Like fuel the sun also provides heat and light. The process taking place in the sun is called
a. Combustion
b. Nuclear process
c. Burning
d. All of these
3. Coal burns with ______
a. Flame
b. Only glow
c. Both flame and glow
d. None of these
4. Burning of charcoal in a closed room will produce
a. Carbon dioxide
b. Nitrogen dioxide
c. Carbon monoxide
d. All of these
5. The substances which have very low ignition temperature will
a. Catch fire easily
b. Will not catch fire
c. Catch fire after some time
d. None of these
6. CNG and LPG are the examples of
a. Solid fuels
b. Liquid fuels
c. Gaseous fuels
d. They are not fuels
7. Ignition temperature is
a. Lowest temperature at catch fire
b. Higher temperature at catch fire
c. Any temperature
d. None of these
8. Combustion is a
a. Chemical process
b. Physical process
c. Both of these processes
d. None of these processes
9. The products of combustion are
a. Carbon dioxide and water
b. Oxygen and water
c. Only carbon dioxide
d. Only oxygen
10. There are following zones of a flame
a. Two
b. Three
c. Four
d. No any zone
ANSWERS
1. B
2. B
3. B
4. C
5. A
6. C
7. A
8. A
9. A
10. B
1. The most reactive metal is:
(a) Iron(b) Gold(c) Zinc(d) Potassium.
2. The liquid metal at room temperature
(a) Mercury(b) Bromine(c) Sodium(d) Gold.
3. Non-metals are:
(a) generally liquids(b) generally gases (c) generally solids and gases(d) generally gases and liquids.
4. The metal which is stored in kerosene:
(a) Phosphorus(b) Magnesium(c) Sodium(b) Magnesium
5. The non-metal which is liquid at room temperature is:
(a) Carbon(b) Iodine(c) Bromine(d) Chlorine.
6. Materials around us can be classified into
(a) Elements and compounds(b) Metals and non-metals (c) Acids and bases(d) None of these.
7. All metals are solids except
(a) Sodium(b) Calcium(c) Mercury(d) Hydrogen.
8. Metal oxides are of nature
(a) Acidic(b) Basic(c) Neutral(d) All of these.
9. The metal which can be cut with a knife
(a) Sodium and potassium(b) Barium and calcium (c) Sodium and mercury(d) Potassium and calcium.
10. When non-metals react with water then
(a) Hydrogen gas is formed
(b) Carbon dioxide gas is formed
(c) Non-metals do not react with water
(d) None of these.
Answer
1. (d)
2. (a)
3. (c)
4. (C)
5. (C)
6. (b)
7. (C)
8.(b)
9.(a)
10.(C)
Answer:
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pls tell ye mat sochna ki hame bura lagega kyu hum hai hi irritating pls tell the truth and express your feeling .
please