Practice Questions set 1 - general science mcq Online Quiz (set-1) For All Competitive Exams

Q-1)   Which one of the following is present in the largest amount in terms of percent by mass in the Earth’s crust?

(a)

(b)

(c)

(d)

Q-2)   Consider the following statements :
  1. Metals can form positive ions by losing electrons to non-metals.
  2. Different metals have same reactivities with water and dilute acids.
  3. A more reactive metal displaces a less reactive metal from its salt solution.
Which of these statements are correct?

(a)

(b)

(c)

(d)

Q-3)   Consider the following statements :
  1. Among the nitrogenous fertilizers used, urea contains maximum percentage of N.
  2. The mixture of calcium sulphate and calcium dihydrogen phosphate is known as superphosphate of lime.
  3. Potassium magnesium sulphate is called the muriate of potash.
Which of the statements given above are correct?

(a)

(b)

(c)

(d)

Explanation:

Statement (1) and (2) are correct. Urea contains maximum percentage of N among various fertilizers used. The mixture of Ca(H2PO4) 2 and CaSO4 is sold as “super phosphate”. Statement (3) is wrong. Muriate is name for potassium chloride KCl.

Q-4)   Which of the following is the most common element in the Universe?

(a)

(b)

(c)

(d)

Q-5)   Match List-I with List-II and select the correct answer using the codes given below the lists:
List-I List-II
A. Limestone 1. Cement
B. Copper 2. Electrical goods
C. Bauxite 3. Manufacture of aeroplanes
D. Manganese 4. Steel
Code: (A) (B) (C) (D)

(a)

(b)

(c)

(d)

Explanation:

Manganese is essential to iron and steel production. At present, steel making accounts for 85 to 90% of the total demand, most of the total demand. Manganese is a key component of low-cost stainless steel formulations and certain widely used aluminium alloys.

Limestone can be used in constructing buildings. It can be used for making cement and mortar. Limestone is used to make glass and even used to make roads.

Bauxite is the mineral ore of aluminium which is used in the manufacture of cans, aeroplanes, sporting and electronic equipment and home appliances.

The Wright Brother’s first aeroplane to fly in 1903 only was able to get off the ground because they modified its engine with aluminium in order to reduce its weight. Without the ability of the strong aluminium, alloys to withstand the huge pressures and stresses involved, high-altitude flying would not be conceivable. In fact, aluminium comprises about 80% of an aircraft’s unladen weight.

The element copper is used extensively as an electrical conductor, for the making of electrical wire.

Q-6)   Match List-I with List-II :
List-I List-II
A. German silver 1. Tin
B. Solder 2. Nickel
C. Bleaching powder 3. Sodium
D. Hypo 4. Chlorine
Select the correct answer from the codes given below: (A) (B) (C) (D)

(a)

(b)

(c)

(d)

Explanation:

Nickel silver, also known as German silver, is a copper alloy with nickel and often zinc.

Solders are typically made from tin or lead or a combination of both in the ratio of 63:37 respectively.

Calcium hypochlorite, also known as bleaching powder, is a chemical compound with the formula Ca(ClO)2. It is widely used for water treatment and as a bleaching agent. This chemical is considered to be relatively stable and has greater available chlorine than sodium hypochlorite (liquid bleach).

Hypo solution is the abbreviation for sodium thiosulphate or sodium hyposulphite, a chemical used to fix the image on photographic film after it has been developed.

Q-7)   Which of the statements given below is/are correct?
The permanent hardness of water is due to the presence of soluble.
  1. chloride of calcium
  2. bicarbonate of calcium
  3. sulphate of magnesium
  4. bicarbonate of magnesium
Select the correct answer using the codes given below:

(a)

(b)

(c)

(d)

Explanation:

Chlorides and sulphates of calcium and magnesium are responsible for the permanent hardness of the water.

Note: Bicarbonates are responsible for the temporary hardness of the water.

Q-8)   Which of the following elements are contained in the fertilizer super-phosphate?
  1. Phosphorus
  2. Hydrogen
  3. Nitrogen
  4. Calcium
Select the correct answer using the codes given below:

(a)

(b)

(c)

(d)

Explanation:

Superphosphate is made by treating phosphate rock with concentrated H2SO4.

It is Ca(H2PO4)2 and hence contains calcium, hydrogen, and phosphorous according to the oxide formation method.

Q-9)   Consider the following statements:
  1. The discovery of inert gases later on did not disturb Mendeleev’s arrangement.
  2. In the present periodic table, periodicity in the properties of elements is related to the periodicity in their electronic configurations.
Which of these statement(s) above is/are correct ?

(a)

(b)

(c)

(d)

Q-10)   In the manufacture of lead glass:
  1. Oxide of lead is added to ordinary glass
  2. Oxide of lead increases the density of glass
  3. Oxide of lead increases the refractive index of glass
  4. Oxide of lead decreases the refractive index of glass

(a)

(b)

(c)

(d)

Explanation: