GENERAL SCIENCE CHEMISTRY ONE LINERS FOR TNPSC UPSC SSC SET 043

GENERAL SCIENCE CHEMISTRY ONE LINERS FOR TNPSC UPSC SSC SET 043

421). Which among the following is a chemical change?
A). A wet towel dries in the sun
B). Lemon juice added to tea causing its colour to change
C). Hot air rises over a radiator
D). coffee is brewed by passing steam through ground coffee

Answer: Lemon juice added to tea causing its colour to change


  
422). Which among the following is a element?
A). Alumina
B). Brass
C). Graphite
D). silica

Answer: Alumina

  
423). consider the following equation for the formation of ammonia from nitrogen and hydrogen:
N2+3H2=2NH3
How many hydrogen molecules are required to react with 100 molecules of nitrogen?
A). 100
B). 200
C). 300
D). 400

Answer: 300


  
424). Which one among the following is used as a moderator 1n nuclear reactors?
A). Ozone
B). Heavy hydrogen
C). Heavy water
D). Hydrogen peroxide

Answer: Heavy water


  
425). Which one of the following contains maximum percentage of nitrogen by mass?
A). Urea
B). Ammonium cyanide
C). Ammonium carbonate
D). Ammonium nitrate

Answer: Urea


426). Match List I with List II and select the correct answer using the code given below the lists:
List I (Substance)                     List II (Raw Material )
A. Glass                                1. Fat and caustic alkali
B. Soap                                 2. Cellulose fibre and gelatin
C. Paper                                3. Silicates of calcium and aluminium
D. Cement                             4. Silica

Below code is given ini order A B C D
A). 3 2 1 4
B). 4 2 1 3
C). 3 1 2 4
D). 4 1 2 3

Answer: 4 1 2 3


  
427). Two elements gallium and oxygen combine among the form a compound Ga2O3. Which among following is the valency of gallium?
A). 1
B). 2
C). 3
D). 4

Answer: 2


  
428). Vinegar is the trade name of
A). Acetic acid
B). Chloroform
C). Carbon tetrachlonde
D). Ethyl alcohol din

Answer: Acetic acid


  
429). Consider the following statements regarding diamond:
1. It is an allotrope of silicon.
2. It is a bad conductor of heat and electricity
3. It is the hardest substance.
4. It burns to produce carbon dioxide
Which of the statements given above are correct?
A). 1, 2, 3 and 4
B). 2, 3, and 4 only
C). 1 and 3 only
D). 1, 2 and 4 only

Answer: 2, 3, and 4 only


  
430). Which one of the following chemicals is used in Beauty Parlours for hair-setting?
A). Sulphur based
B). Phosphorus based
C). Silicon based
D). Iron based

Answer: Phosphorus based