Karnatak University 2007 Science - Question Paper

electrolytic refining ?
(A) Both Cathode and Anode are pure Copper plates
(B) Only Anode is made up of pure Copper
(C) Only Cathode is an impure Copper plate
(D) Impure Copper is Anode and pure Copper is Cathode.
Ans :
30. Copper + Zinc + Nickel — This composition of metals is helpful in producing
(A) Surgical instruments
(B) Resistance coils
(C) Heating coils
(D) Cutting tools.
Ans :
31. The substance that acts as an insulator at 0 K, but conducts electric current as the
temperature increases is
(A) Carbon (B) Indium
(C) Germanium (D) Phosphorus.
Ans :
32. Compound of Silicon used in glass cutting is
(A) Silicon carbide
(B) Silicon dioxide
(C) Sodium silicate
(D) Calcium silicate.
Ans :
33. Which 1 of the subsequent is the covalent structure ( structural formula ) of benzene ?
(A)
H|
C|
H
=
H|
C|
H
(B) H –
H|
C|
H
–
H|
C|
H
–
H|
C|
H
– H
(C)
C
C
H H
H H
H
H
H
H
H
H
H
H
C
C
|
C
C
|
(D)
C
C
H
H
H
H
C
C
|
C
C
| |
H
H
Ans :

34. For the production of glass that absorbs radiation, which 1 of the subsequent is
used ?
(A) Aluminium oxide
(B) Lead oxide
(C) Boron
(D) Carbon.
Ans :
35. Which 1 of the subsequent is made up of a plastic that does not turn soft or melt on
heating ?
(A) Plastic bucket
(B) Plastic insulation on electric wires
(C) Plastic water pipes
(D) Handle of the electric iron.
Ans :
36. Which of the subsequent is prepared by synthetic material ?
(A) Gravel
(B) Wooden chair
(C) Window rods
(D) Fuse box.
Ans :
37. Which 1 of the subsequent is not accurate with respect to the use of hard water ?
(A) Clothes are easily washed when used with soap and hard water
(B) Pulses are not cooked properly in hard water
(C) Hard water used for bathing makes the skin dry and leaves whitish residue on
skin

Earning:   Approval pending.