(A) Sodium and Potassium
(B) Sodium and Calcium
(C) Sodium and Chlorine
(D) Chlorine and Iodine
Q. The speed of sound in sea water is about:
(A) 15,00 m/s
(B) 16,00 m/s
(C) 17,00 m/s
(D) 18,00 m/s
Q. Sea water PH is limited to the range:
(A) 5.5 to 6.4
(B) 6.5 to 7.4
(C) 7.5 to 8.4
(D) 8.5 to 9.4
Answers:
1. (C) Sodium and Chlorine
2. (A) 15,00 m/s
3. (C) 7.5 to 8.4
(A) Magnetite and Pyrite
(B) Magnetite and Bauxite
(C) Hematite and Pyrite
(D) Hematite and Magnetite
Q. What is the chemical formula of Hematite?
(A) Fe2O3
(B) Fe3O4
(C) Fe2O4
(D) Fe3O2
Q. What is the chemical formula of Magnetite?
(A) Fe2O3
(B) Fe3O4
(C) Fe2O4
(D) Fe3O2
Answers:
1. (D) Hematite and Magnetite
2. (A) Fe2O3
3. (B) Fe3O4
(A) Nitrogen
(B) Carbon
(C) Hydrogen
(D) Oxygen
Q. The most abundant element present in the earth’s crust is:
(A) Carbon
(B) Hydrogen
(C) Oxygen
(D) Nitrogen
Q. What is the atomic number of Oxygen?
(A) 8
(B) 9
(C) 10
(D) 11
Answers:
1. (D) Oxygen
2. (C) Oxygen
3. (A) 8
(A) Nitrogen + Hydrogen
(B) Nitrogen + Carbon
(C) Nitrogen + Oxygen
(D) Oxygen + Carbon
Q. What is the chemical name of laughing gas?
(A) Nitrous oxide
(B) Nitric oxide
(C) Nitrogen dioxide
(D) None of these
Q. Nitrous oxide (laughing gas) has significant medical uses, especially in:
(A) Surgery
(B) Dentistry
(C) Both A & B
(D) None of these
Answers:
1. (C) Nitrogen + Oxygen
2. (A) Nitrous oxide
3. (C) Both A & B
(A) Strongly attracted by a magnet
(B) Not attracted by a magnet
(C) Not a magnet
(D) Weakly attracted by a magnet
Q. Cobalt is a chemical element with the symbol Co, it’s atomic number is:
(A) 17
(B) 27
(C) 37
(D) 47
Q. Cobalt is the active center of a group of coenzymes called:
(A) Cobaltimins
(B) Cobalium
(C) Cobalamins
(D) None of these
Answers:
1. (A) Strongly attracted by a magnet
2. (B) 27
3. (C) Cobalamins