General Science Chemistry MCQ-4

The source of electrical energy on the Apollo moon flights was

(A) a generator set
(B) fuel cell
(C) Ni-Cd cell
(D) lead storage batteries

The most reactive among the halogens is

(A) fluorine
(B) chlorine
(C) bromine
(D) iodine

Consider the following statements
1 . The carat is a unit of purity for gold alloys.
2 . 18 carat gold is 24 parts gold and 6parts another metal.
Which of the statement(s) given above is/are correct?

(A) Only 1
(B) Only 2
(C) Both 1 and 2
(D) Neither 1 nor 2

When metal is obtained in the molten state from its ore, the process may b called

(A) rusting
(B) smelting
(C) calcinations
(D) thermal dissociation

In an adiabatic compression, the decrease in volume is associated with

(A) increase in temperature and decrease in pressure
(B) decrease in temperature and increase in pressure
(C) decrease in temperature and decrease in pressure
(D) increase in temperature and increase in pressure

Which of the following statements about the commonly used automobile battery are true?
1 . It is usually a lead-acid battery.
2 . It has six cells with a potential of 2V each.
3 . Its cells work as galvanic cells while discharging power.
4 . Its cells work as electrolytic cells while recharging.
Select the correct answer using the codes given below.

(A) 1 2, 3 and 4
(B) 1, 2 and 3
(C) 2 and 4
(D) 3 and 4

Which one of the following sequence of the chemical elements is correct in terms of the descending order of atomic radius

(A) B-C-N-O
(B) C-B-O-N
(C) N-O-B-C
(D) 0-N-C-B

Match Column I with Column II and select the correct answer using the codes given below the columns .
Column I Column II (Alloy) (Constituent)
A . Solder 1 . Iron and carbon
B . Brass 2 . Copper and zinc
C . Bronze 3 . Copper and tin
D . Steel 4 . Lead and tin
Codes
A B C D

(A) 1 2 3 4
(B) 4 2 3 1
(C) 1 3 2 4
(D) 4 3 2 1

Consider the following statements
1 . Iron is manufactured from the ore hematite.
2 . Iron rusts in the presence of O2 and moisture.
3 . Iron present in hemoglobin of blood.
Which of the above is/are correct a boutiron?

(A) Only 1
(B) 2 and 3
(C) 1 and 3
(D) 1, 2 and 3

Entropy change of a system and its surroundings in equilibrium

(A) increases
(B) decreases
(C) remains constant
(D) either increases or decreases

Match the Column I with the Column II .
Column I
Column II
A . Primary battery
B . Secondary battery
C . Electrochemical cell
D . Daniell cell
1 . Reaction between Zn and Cu ions to produce an electric current
2 .Change of chemical energy to electrical energy
3 .Lead storage battery
4 .Leclanche cell
Codes
ABCD

(A) 4 3 2 1
(B) 3 2 1 4
(C) 2 1 4 3
(D) 1 4 3 2

The long form of Periodic Table is based on

(A) electro negativity
(B) mass of the atom
(C) shape of the atom
(D) atomic number

Which one of the following is an important ore of magnesium?

(A) Cassiterite
(B) Malachite
(C) Carnalite
(D) Galena

Dead burnt is

(A) anhydrous Na2S04
(B) Na2C03 which is useful for softening.
(C) CaS04 which is not useful for softening.
(D) anhydrous CuS04

MatchColumn I (Thermodynamic Relation/Law) with Column II (Related Term/Concept) and select the correct answer using the codes given below the columns .
Column I
A . First law of thermodynamics
B . Equation of state of an ideal gas
C . Thermodynamic disorder
Column II
1 . Universal gas constant
2 . Coefficient of thermal expansion
3 . Conservation of energy
4 . Entropy
Codes
ABC

(A) 3 4 1
(B) 2 1 4
(C) 3 1 4
(D) 2 4 1

Assertion (A) For a galvanic cell, oxidation takes place at anode and reduction at cathode.
Reason (R) Electrons in the external circuit move from anode to cathode.

(A) Both A and R are individually true and R is the correct explanation of A.
(B) Both A and R are individually true, but R is not the correct explanation of A.
(C) A is true, but R is false.
(D) A is false, but R is true.

Match Column I with Column II .
Column I- Column II
A . Element with smallest atomic radius 1 . Cs
B . Element with largest atomic radius 2 . F
C . Element with highest electron affinity 3 . Br
D . Element with negative electron affinity 4 . Cl
Codes
ABCD

(A) 3 2 1 4
(B) 2 1 4 3
(C) 1 4 3 2
(D) 4 3 2 1