Wednesday, November 30, 2011

MCQ


1              The radio isotope used in the treatment of cancer
                C-12                       Co-60                    I-31                        P-31
2              A nuclear reaction  must be balanced in terms of
                Mass                     Energy                  No of ele             Mass and energy
3              gamma rays are
                High energy electrons                                                    low energy ele.
                High energy electromagnetic  waves                     high energy positrons
4              H-Bomb is based on the principle of                       
                Nuclear fussion                 nuclear fission                  nuclear explosion            chemical reaction
5              In alfa decay
                N/P decreases                  N/P increases                    N/P constant                     None
6              half life period of a radio active element depends upon
                Amount of element        temp.                    pressure                              none
7              When U-238 is bombarded, it is converted in to
                Th                           U-235                    Pu-239                  Pb
8              20Ca40                  and  19K40   are
                Isomers                                isotopes               isobars                 isoelectronic
9              most power ful out of all the radioactive rays are
                Alpha rays           bita rays               gama rays            X rays
10           the sun is continuously releasing nuclear energy in the form of radiation. This
                Prevents it from collapsing under its own weight           
                Prevents light from other stars from reaching the sun
                Makes  it lighter                                                None of these
11           the reciprocal of radioactive decay constant is called
                Half life period                  whole life period              average life                        none

12           which of the following does not contain material particle
                Alfa rays               bita rays               anode rays                          gamma rays
13           a possible material for use in nuclear reactors as fuel is
                Thorium               Zr            Be           Pu
14           the SI unit of radioactivity is
                Curie                     micro curie                          Rutherford                         Becquerel          
15           the atomic no of element increases by one unit in
                Alpha emission                 bita emission                    gamma emission              elec. Capture
16           isotopes and isobars were first discovered in
                Balmer series                     radioactive series            lyman series                       none
17           the bond angle in water is about
90                                   180                                         105                                         75
18           which of the following   is linear compound
                Co2                                        No2                                        So2                         ClO2  or SiO2
19           H bond is absent in
                Water                   ammonia                             ethyl  alcohol                     diethyl  ether
20           the paramagnetic behaviour of oxygen is best explained by
                Molecular orbital theory              resonance theory            VSEPR theory                    V.B. theory
21           lateral overlapping expected in
                Sigma bond                        pie bond                              metallic bond                     none of these
22           a metallic bond is
                Ionic                      electrostatic                      polar covalent                   non-polar covalent
23        Epsom salt is:
(1) Sodium bicarbonate
(2) Hydrated calcium sulphate
(3) Hydrated magnesium sulphate
(4) Zinc sulphate
24. Which of the following solutes will produce temporary hardness in water?
(1) NaHCO3
(2) MgCI2
(3) Mg(HCO3)2
(4) NaCI.

25. Which form of carbon is good conductor?
(1) Amorphous
(2) Diamond
(3) Graphite
(4) Coal.

26. Nitrogen is obtained by the thermal decomposition of:
(1) AgNO3
(2) NH4NO3
(3) NH4NO2
(4) Pb(NO3)2
27  Which of the hydrohalic acid is inexpensive, strong and stable against oxidation?
(1) HI
(2) HF
(3) HCI
(4) HBr

28. The heat of neutralization is highest in the reaction between:
(1) NaOH-CH3COOH
(2) HNO3NH4OH
(3) HCI-NaOH
(4) NH4OH-CH2COOH

29. When k2Cr2O7 crystals are heated with concentrated HCI the gas evolved is:
(1) HCI
(2) O2
(3) CI2
(4) CrO2CI2


30. The indicator used in the titration of Iodine against sodium thiosulphate is:
(1) Strach
(2) KI
(3) K2CrO4
(4) K3Fe(CN)6


31. Liquid petroleum Gas (LPG) mostly contains:
(1) propene
(2) Methane
(3) Ethane
(4) Butane


32. Coal gas is a mixture of:
(1) CH4 and CO
(2) H2and CO
(3) H2,CO and CH4
(4) H2O and CO


33        The triple bond between the carbon atoms causes acetylene, C2H2, to have which of
the following shapes?
w) trigonal planar (pron: try-gon-al)
x) linear
y) tetrahedral
z) trigonal bipyramidal
ANSWER: X -- LINEAR
34        What is the EMPIRICAL formula for glucose?
ANSWER: CH2O (read: C - H - 2 - O)

35.       Which of the following four elements has the largest atomic radius? Is it:
w) strontium
x) francium
y) calcium
z) bromine
ANSWER: X -- FRANCIUM
36        Which of the following odors does the ester, methyl salicylate, produce? Is the odor
that of:
w) cinnamon
x) avocado
y) orange
z) oil of wintergreen
ANSWER: D -- OIL OF WINTERGREEN

37        What two chemical elements are found in sphalerite?
ANSWER: ZINC AND SULFUR (ZnS)

38        Periclase is composed of what two elements?
ANSWER: MAGNESIUM AND OXYGEN (MgO)

39        Who patented the common dry cell?
ANSWER: GEORGES LECLANCHÉ

40.       Ca(BrO3)2  is called:
w) calcium bromate
x) calcium bromite
y) calcium dibromite
z) calcium bromide
ANSWER: W -- CALCIUM BROMATE

41        What is the common oxidation state of Radium?
ANSWER: +2 (read: Plus two)

42        What is the pH of a solution that is 1000 times more acidic than pure water?
ANSWER: 4

43        which of the following are saturated aliphatic hydrocarbons?
w) alkanes
x) alkenes
y) alkynes
z) nixanes
ANSWER: W – ALKANES
44        Sucrose, ordinary table sugar, may be classified as a:
w) Monosaccharide
x) Disaccharide
y) Polysaccharide
z) Oligosaccharide
ANSWER: X -- DISACCHARIDE
45        Pure water is approximately what molar concentration:
w) .55 Molar
x) 5.5 Molar
y) 55 Molar
z) 550 Molar
ANSWER: Y -- 55 MOLAR
46        The rate at which dissolution occurs is LEAST dependent upon which one of the
following factors:
w) temperature
x) pressure
y) solution concentration
z) solute surface area
ANSWER: X -- PRESSURE
47        Name the person who developed a table of elements which revealed regularities in
elemental properties?
ANSWER: DMITRI MENDELEEV

48        Who was the first American chemist to receive a Nobel Prize? He was selected in
1914 for his precise determination of atomic weights.
w) Edward Frankland
x) Theodore Richards
y) John Bardeen
z) Paul Dirac
ANSWER: X -- THEODORE RICHARDS

49        What is the word that describes a substance that reacts with both strong acids and strong
bases?
ANSWER: AMPHOTERIC

50        Of the following, which has units of "Pascal".
w) force
x) volume
y) pressure
z) viscosity
ANSWER: Y -- PRESSURE
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