GENERAL SCIENCE CHEMISTRY ONE LINERS FOR TNPSC UPSC SSC SET 035

GENERAL SCIENCE CHEMISTRY ONE LINERS FOR TNPSC UPSC SSC SET 035

341). Match List I (Particle) with List II(Approximate Rest Energy in MeV) and 
select the Answer:answer using the codes given below the Lists :
List I (Particle)       List II (App.Rest Energy in MeV)
1. Electron                       940
2. Neutrino                      140
3. Neutron                       0.5
4. Pi-Meson                      0

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

Answer: 3 4 1 2


   
342). The purest form of iron is
A). cast iron
B). pig iron
C). steel
D). wrought iron

Answer: wrought iron


   
343). Which one of the following elements does NOT have allotropic forms ?
A). Oxygen
B). Nitrogen
C). Sulphur
D). Phosphorus

Answer: Nitrogen


   
344). Which one of the following statements is NOT true ?
A). Oxidation state of oxygen can also be +2
B). H2O2 acts as a reducing agent towards O3
C). Oxidation state of S in S8 is zero
D). The change of PbO2 to Pb(NO3)2
is oxidation

Answer: The change of PbO2 to Pb(NO3)2 is oxidation


   
345). The process 28^56Fe^++ → 28^56Fe^+++ is appropriately classified as
A). ionization
B). oxidation
C). reduction
D). nuclear reaction

Answer: oxidation



346). With reference to their relative strengths, which one of the following 
sequences of the bases is Answer:?
A). HCO3^− > CH3COO^− > CIO4^− > OH−
B). CIO4^− < CH3COO^− > HCO3^− > OH−
C). OH− < HCO3^− < CIO4^− < CH3COO^−

 D). CIO4^− > CH3COO^− > OH− > HCO3^−

 
Answer: CIO4^− > CH3COO^− > OH− > HCO3^−


   
347). Which one of the following sequences of chemical elements is Answer:in terms  of the descending order of the atomic radius ?
A). B-C-N-O
B). C-B-O-N
C). N-O -B-C
D). O -N -C-B

Answer: B-C-N-O


   
348). Consider the following statements with regard to diamond and graphite :
1. Diamond and graphite are isotopes of carbon.
2. In diamond each carbon atom is sp3 hybridized whereas in graphite each carbon  atom is sp2 hybridized.
3. C-C bond length in diamond is greater than that in graphite.
4. Graphite is less reactive than diamond.
Which of these statements are Answer:?
A). 1 and 2
B). 2 and 3
C). 3 and 4
D). 2 and 4

Answer: 2 and 3


   
349). An atom has 7 electrons in its M-shell and contains 18 neutrons in its 
nucleus. What is its mass number ?
A). 25
B). 27
C). 35
D). 43

Answer: 35


   
350). Emission of a beta particle from an atom
A). increases the number of protons in the atom
B). increases the number of neutrons in the atom
C). decreases the number of protons in the atom
D). does not change the number of neutrons and protons in the atom

Answer: increases the number of protons in the atom