GENERAL SCIENCE CHEMISTRY ONE LINERS FOR TNPSC UPSC SSC SET 073

GENERAL SCIENCE CHEMISTRY ONE LINERS FOR TNPSC UPSC SSC SET 073

721). Match list I correctly with list II and select your answer using the codes given below:
List I                              List II
a) Dolomite                       1. Zinc
b) Calamine                      2. Magnesium
c) Malachite                      3. Copper
d) Cryolite                        4.Aluminium
                                       5.Lead

Codes:
a b c d
A). 1 2 4 5
B). 2 1 3 4
C). 1 1 4 3
D). 2 1 3 5

Answer: 2 1 3 4


   
722). Match list I correctly with list II and select your answer using the codes given below:
List l                          List Il
a) Brass              1) Copper and tin
b) Bronze            2) Copper and zinc
c) Solder             3) Steel and nickel
d) lnvar               4) Tin and lead
                          5) Copper and nickel

Codes:
a b c d
A). 2 1 5 3
B). 1 2 4 3
C). 2 1 4 5
D). 2 1 4 3

Answer: 2 1 4 3


   
723). Which of the following pair is / are matched?
1) Natural fibre - Cotton
2) Natural rubber - Thiokol
3) Synthetic fibre - Nylon
4) Synthetic detergent - Soap
A). 1 & 3
B). 2 & 3
C). 3 & 4
D). 2 & 4

Answer: 1 & 3

   
724). Which one of the following gases is readily soluble in water at room temperature?
A). chlorine
B). carbon dioxide
C). ammonia
D). nitrogen

Answer: ammonia


   
725). Which one of the following undergoes polymerisation to form a plastic?
A). methane
B). acetic acid
C). ethanol
D). ethylene

Answer: ethylene


726). Which by product is obtained in the manufacture of soap from oils?
A). fats
B). glycerine
C). sodium chloride
D). sodium hydroxide

Answer: glycerine


   
727). Which one of the following properties is not a characteristic of a metal?
A). it forms acidic oxides
B). it can be beaten into sheets
C). it is good conductor of heat
D). it forms positive ions by loss of electrons

Answer: it forms acidic oxides

   
728). Which one of the following combinations would liberate carbon dioxide gas?
A). calcium carbide + water
B). calcium carbonate + water
C). calcium carbonate + dilute hydrochloric acid
D). calcium hydroxide + dilute hydrochloric acid

Answer: calcium carbonate + dilute hydrochloric acid


   
729). Ethane and ethylene may be distinguished by using a few drops of
A). litmus solution
B). bromine water
C). lime water
D). dilute hydrochloric acid

Answer: bromine water

   
730). The percentage of oxygen present in air by volume is
A). 0.005
B). 0.205
C). 0.278
D). 0.785

Answer: 0.205