GENERAL SCIENCE #31
MULTIPLE CHOICE QUESTIONS
1. Which
of the following statements are true for pure substances?
(i)
Pure substances contain only one kind of particles
(ii)
Pure substances may be compound or mixtures
(iii)
Pure substances have the same composition throughout
(iv)
Pure substances can be exemplified by all elements other than nickel
(a) (i) and (ii)
(b) (i) and (iii)
(c) (iii) and (iv)
(d) (ii) and (iii)
Answer:
(b)
2. What
is called the rusting of an article made up of iron?
(a) Corrosion and it is a physical as well as chemical
change
(b) Dissolution and it is a physical change
(c) Corrosion and it is a chemical change
(d) Dissolution and it is a chemical change
Answer:
(c)
3. A
mixture of sulphur and carbon disulphide is ……………
(a) heterogeneous and shows Tyndall effect
(b) homogeneous and shows Tyndall effect
(c) heterogeneous and does not show Tyndall effect
(d) homogeneous and does not show Tyndall effect
Answer:
(d)
4. Tincture
of iodine has antiseptic properties. This solution is made by dissolving ……………
(a) iodine in potassium iodide
(b) iodine in vaseline
(c) iodine in water
(d) iodine in alcohol
Answer:
(d)
5. Which
of the following are homogeneous in nature?
(i)
ice
(ii)
wood
(iii)
soil
(iv)
air
(a) (i) and (iii)
(b) (ii) and (iv)
(c) (i) and (iv)
(d) (iii) and (iv)
Answer:
(c)
6. Blood
and sea water are ……………
(a) both mixtures
(b) both are compounds
(c) blood is a mixture whereas sea water is a compound
(d) blood is a compound and sea water is a mixture
Answer:
(a)
7. Sol
and gel are examples of which of the following?
(a) Solid-solid colloids
(b) Sol is a solid-liquid colloid and gel is liquid solid
colloid
(c) Sol is solid-solid colloid and gel is solid-liquid
colloid
(d) Sol is a liquid-solid colloid and gel is a solid-liquid
colloid
Answer:
(b)
8. In
a water-sugar solution ……………
(a) water is solute and sugar is solvent
(b) water is solvent and sugar is solute
(c) water is solute and water is also solvent
(d) None of the above
Answer:
(b)
9. Boron
and carbon are ……………
(a) metalloids
(b) metalloid and non-metal respectively
(c) metal
(d) non-metal and metalloid respectively
Answer:
(b)
10. Which
of the following are physical changes?
(i)
Melting of iron metal
(ii)
Rusting of iron
(iii)
Bending of an iron rod
(iv)
Drawing a wire of iron metal
(a) (i), (ii) and (iii)
(b) (i), (ii) and (iv)
(c) (i), (iii) and (iv)
(d) (ii), (iii) and (iv)
Answer:
(c)
11. Which
of the following are chemical changes?
(i)
Decaying of wood
(ii)
Burning of wood
(iii)
Sawing of wood
(iv)
Hammering of a nail into a piece of wood
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)
Answer:
(a)
12. Two
substances, A and B were made to react to reaction a third substance, A2B
according to the following 2 A + B → A2B
Which
of the following statements concerning this reaction are incorrect?
(i)
The product A2B shows the properties of substances A and B
(ii)
The product will always have a fixed composition
(iii)
The product so formed cannot be classified as a compound
(iv)
The product so formed is an element
(a) (i), (ii) and (iii)
(b) (ii), (iii) and (iv)
(c) (i), (iii) and (iv)
(d) (ii), (iii) and (iv)
Answer:
(c)
13. Two
chemical species X and Y combine together to form a product P which contains
both X and Y
X +
Y → P
X
and Y cannot be broken down into simpler substances by simple chemical
reactions. Which of the following concerning the species X, Y and P are
correct?
(i)
P is a compound
(ii)
X and Y are compounds
(iii)
X and Y are elements
(iv)
P has a fixed composition
(a) (i), (ii) and (iii)
(b) (i), (ii) and (iv)
(c) (ii), (iii) and (iv)
(d) (i), (iii) and (iv)
Answer:
(d)
14. Which
of the following methods would you use to separate cream from milk?
(a) Fractional distillation
(b) Distillation
(c) Centrifugation
(d) Filtration
Answer:
(c)
15. Cooking
of food and digestion of food ……………
(a) are both physical processes
(b) are both chemical processes
(c) cooking is physical whereas digestion is chemical
(d) cooking is chemical whereas digestion is physical
Answer:
(b)
16. Mercury
and bromine are both ……………
(a) liquid at room temperature
(b) solid at room temperature
(c) gases at room temperature
(d) both ‘a’ and ‘b’
Answer:
(a)
17. A
mixture of two or more miscible liquids, for which the difference in the
boiling points is less than 25 K can be separated by the process called which
of the following?
(a) Fractional distillation
(b) Crystallization
(c) Centrifugation
(d) Filtration
Answer:
(a)
18. After
heating common salt and ammonium chloride for a few minutes, which of the
following can be observed on the upper part of the inverted funnel?
(a) Reddish brown deposit
(b) Water droplets
(c) A white solid deposit
(d) A yellow gas
Answer:
(c)
19. Which
of the following is a metalloid?
(a) Germanium
(b) Gallium
(c) Carbon
(d) Sodium
Answer:
(a)
20. Who
was the first person to use the term element?
(a) Robert Boyle
(b) Lavoisier
(c) Dalton
(d) Charles
Answer:
(a)
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