Questions and answers for exam Preparation

MCQs

Total Questions : 10

In the manufacturing of safety matches, which of the following materials are used to coat the two sides of match boxes?
(a) Yellow phosphorus
(b) Glue
(c) Glass powder
(d) Red phosphorus

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

Discuss Question

Answer: Option C. -> (a), (b) and (d)
:
C

Option: (c)

Question 2.

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 3.

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 4.

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 5.

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 6.

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 7.

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 8.

Match List I and List II and select the correct answer by using the codes given below the lists.
List I                            List II
A. Aluminium     1. Monazite
B. Uranium         2. Pitch blende
C. Thorium         3. Bauxite
D. Lead               4. Galena
                            5. Haematite

5 3 2 4
3 2 4 1
3 2 1 4
2 3 1 5

Discuss Question

Answer: Option C. -> 3 2 1 4
:
C

Option: (c)

Question 9.

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 10.

Match List I and List II and select the correct
List I (Process)                 List II (Changes)
A. Evaporation           1. liquid into gas
B. Sublimation           2. gas into liquid
C. Freezing                 3. solid into gas
D. Melting                  4. solid into liquid
                                     5. Liquid into solid