set 2 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 3 EXERCISES
The following question based on nature of matter and composition topic of general science mcq
(a) $N_2$
(b) N$H_3$
(c) $O_2$
(d) Ne
The correct answers to the above question in:
Answer: (a)
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Question : 1
White gold is used in jewelry and contains two elements, gold and palladium. A jeweler has two different samples that are both identical in appearance and have a uniform composition throughout. What can be said about the samples?
a) The samples have variable compositions and are classified as metallic solutions.
b) The materials are heterogeneous mixtures and can be classified by their components
c) They are homogeneous mixtures and be classified as metallic alloys.
d) The samples are heterogeneous mixtures that can be separated using magnetic properties.
Answer »Answer: (c)
As they have uniform composition throughout they are considered a homogeneous mixture.
Both samples are a mixture of two metals (gold and palladium) and thus are alloys.
Question : 2
Which of the following is a colloid ?
a) Silicic acid
b) Urea solution
c) Sugar solution
d) NaCl solution
Answer »Answer: (a)
Those substances which can not pass through the membrane are termed colloids.
Example: silicic acid.
Whereas sugar solution, urea and NaCl can pass through the membrane.
Question : 3
The main component of Gobar gas is?
a) Ethylene
b) Chlorine
c) Hydrogen
d) Methene
Answer »Answer: (d)
Question : 4
Which of the following is considered to be a pure substance?
a) Muddy water
b) Sodium chloride
c) Granite
d) Milk of magnesia
Answer »Answer: (b)
Sodium chloride being compound is a pure substance. Granite, muddy water and milk of magnesia all are mixtures.
Question : 5
Vermicompost is an/a
a) organic bio fertilizer
b) inorganic fertilizer
c) toxic substance
d) synthetic fertilizer
Answer »Answer: (a)
Question : 6
Kerosene is a mixture of
a) saturated hydrocarbons
b) aromatic hydrocarbons
c) aliphatic hydrocarbons
d) alicyclic hydrocarbons
Answer »Answer: (c)
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