21- Which of the following is a non-ferrous metal?
A. Aluminum
B. Iron
C. Phosphorus
D. Cobalt
View Answer
Answer : A. Aluminum
Description
22- Which of the following is a non-metal that remains liquid at room temperature?
A. Bromine
B. Chlorine
C. Helium
D. Phosphorus
View Answer
Answer : A. Bromine
Description
23- From which mineral is radium obtained?
A. Hematite
B. Limestone
C. Rutile
D. Pitchblende
View Answer
Answer : D. Pitchblende
Description
24- What is laughing gas?
A. Pitchblende
B. Nitrous oxide
C. Sulphur dioxide
D. Carbon dioxide
View Answer
Answer : B. Nitrous oxide
Description
25- Which of the following is used as a material for making protective windows in space probes?
A. Steel
B. Graphite
C. Tungsten
D. Diamond
View Answer
Answer : D. Diamond
Description
26- Which form of phosphorus is used in safety matches?
A. White
B. Yellow
C. Black
D. Red
View Answer
Answer : D. Red
Description
27- Stainless steel is an alloy of:
A. Iron, carbon and nickel
B. Iron and manganese
C. Iron, chromium and nickel
D. Iron, chromium and zinc
View Answer
Answer : C. Iron, chromium and nickel
Description
28- Which of the following is not correctly matched?
A. Galena: Lead sulphide
B. Green vitriol: Copper sulphate
C. Plaster of Paris: Calcium sulphate
D. Calomel: Mercurous chloride
View Answer
Answer : B. Green vitriol: Copper sulphate
Description
29- Which of the following metals forms an amalgam with other metals?
A. Lead
B. Tin
C. Mercury
D. Zinc
View Answer
Answer : C. Mercury
Description
30- Which of the following is not an ore of aluminum?
A. Azulite
B. Cryolite
C. Bauxite
D. Feldspar
View Answer
Answer : A. Azulite
Description
31- Which of the following is an element?
A. Ruby
B. Sapphire
C. Diamond
D. Emerald
View Answer
Answer : C. Diamond
Description
32- Most soluble in water is:
A. Sugar
B. Camphor
C. Sulphur
D. Common salt
View Answer
Answer : A. Sugar
Description
33- Sodium metal is kept under:
A. Kerosene
B. Petrol
C. Alcohol
D. Water
View Answer
Answer : A. Kerosene
Description
34- Bromine is:
A. A red liquid
B. A black solid
C. A highly inflammable gas
D. A colorless gas insoluble in water
View Answer
Answer : A. A red liquid
Description
35- Which of the following statements about dry ice are correct?
1. It is a useful refrigerant.
2. On heating it sublimes.
3. It has acidic properties.
4. It causes burns when passed against the skin.
A. 1 and 3
B. 1, 2 and 3
C. 2 and 4
D. 1, 3 and 4
View Answer
Answer : D. 1, 3 and 4
Description
36- Consider the following statements about aluminum:
1. It is the third most abundant element in the earth’s crust.
2. It is used to make over-head electric transmission lines.
3. Aluminum vessels cannot be used for making alkali solutions.
A. 1 and 2
B. 1, 2 and 3
C. 2 and 3
D. 1 and 3
View Answer
Answer : B. 1, 2 and 3
Description
37- The average adult has a blood volume of about ______ liters.
