Questions and answers for exam Preparation

MCQs

Total Questions : 137 | Page 7 of 14 pages

Question 61. Which one of the following statements is not correct?

The presence of NaCI increases the rate of setting of plaster of Paris
Gypsum is added to the cement to slow down its rate of setting
All alkaline earth metals form hydrated salts
Barium and strontium are found free in nature

Discuss Question

Answer: Option D. -> Barium and strontium are found free in nature
:
D
Option:(d)

Question 62. Match List I and List II and select the correct answer by using the codes given below.
List I                                        List II
A. Silver bromide          1. Etching of glass
B. Hydrogen peroxide 2. Purification of air
C. Ozone                         3. Bleaching agent
D. Hydrofluoric acid     4. photography

4 3 2 1
1 3 2 4
4 2 1 3
2 1 3 4

Discuss Question

Answer: Option A. -> 4 3 2 1
:
A
Option:(a)

Question 63. Match List I and List II and select the correct answer by using the codes given below.
List I (Compound added)                      List II (Color imparted to glass)
A. Manganese dioxide                       1. Yellow
B. Selenium oxide                               2. Green
C. Chromium oxide                             3. Red
D. Iron oxide                                        4. Purple

1 2 3 4
2 3 1 4
3 1 4 2
4 3 2 1

Discuss Question

Answer: Option D. -> 4 3 2 1
:
D
Option:(d)

Question 64. Liquefied Petroleum Gas consists of mainly

methane, ethane and hexane
ethane, hexane and nonane
methane, butane and propane
methane, hexane and nonane

Discuss Question

Answer: Option C. -> methane, butane and propane
:
C
Option:(c)

Question 65. Which of the following is the correct increasing order of their relative densities?
(a) Mercury
(b) Gold
(c) Lead
(d) Aluminium

(c), (b), (a), (d)
(c), (a), (d), (b)
(d), (a), (c), (b)
(d), (c), (a), (b)

Discuss Question

Answer: Option D. -> (d), (c), (a), (b)
:
D
Option:(d)

Question 66. The highest grade of coal whose surface is shining and has the highest calorific value, is

Bituminous
Lignite
Anthracite
Peat

Discuss Question

Answer: Option C. -> Anthracite
:
C
Option:(c)

Question 67. Which of the following causes the rusting of iron?
(a) Oxidation
(b) Reduction
(c) Chemical reaction with oxygen
(d) Chemical reaction with C0₂

(a) and (b)
(b) and (c)
(c) and (d)
(a) and (c)

Discuss Question

Answer: Option C. -> (c) and (d)
:
C
Option: (c)

Question 68. Match List I and List II and select the correct answer by using the codes given below the lists.
List I (Particle)              List II (Charge)
A. a particle                1. + 2e
B. P particle                2. - e
C. Neutron                  3. Zero
D. Proton                    4. + e

1 2 3 4
2 4 3 1
3 2 1 4
4 3 2 1

Discuss Question

Answer: Option A. -> 1 2 3 4
:
A
Option:(a)

Question 69. Match List I with List II and select the correct answer by using the codes given below.
List I                                                  List II
A. Isotopes    1. atoms having same atomic number but different mass numbers
B. Isobars      2. atoms with same number of neutrons but different atomic numbers
C. Isotones    3. atoms with same mass number but different atomic numbers

1 2 3
1 3 2
2 3 1
2 1 3

Discuss Question

Answer: Option B. -> 1 3 2
:
B
Option:(b)

Question 70. Stars are massive source of energy. The source of energy in all stars including the sun is
(a) unknown
(b) fusion of hydrogen nuclei into helium nucleus
(c) fission of bigger nuclei into smaller ones
(d) stored energy in the atmosphere