46 .A ray of white light strikes the surface of an object. If all the colours are reflected the surface would appear:
A.  Black
B.  White
C.  Grey
D.  Opaque
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47 .Quality of musical note depends on
A.  fundamental frequency
B.  harmonics present
C.  amplitude of the wave
D.  velocity of sound in medium
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48 .A switch is always connected to the
A.  earth wire
B.  neutral wire
C.  line wire
D.  None of these
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49 .The heating element of an electric heater should be made of a material having
A.  high specific resistance and high melting point
B.  high specific resistance and low melting point
C.  low specific resistance and low melting point
D.  low specific resistance and high melting point
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50 .White clothes are cooler than black ones because they
A.  Absorb all the light tha reaches them
B.  reflect all the light that reaches them
C.  will nt allow the light to penetrate
D.  cool the sun light completely
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51 .One astronomical unit is the average distance between:
A.  Earth and the sun
B.  Earth and the Moon
C.  Jupiter and the Sun
D.  Pluto and the Sun
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52 .What type of mixture is smoke?
A.  Solid mixed with a gas
B.  Gas mixed with a gas
C.  Liquid mixed with a gas
D.  Gas mixed with a liquid and soli
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53 .Which among the following is symbiosis Nitrogern - fixing bacteria?
A.  Pseudomoria
B.  Rhizobium
C.  Azotobacter
D.  Xanthomonas
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54 .The freezer in a refrigerator is located at the top section so that:
A.  the entire chamber of the refrigerator is cooled quickly due to convection
B.  the motor is not heated
C.  the heat gained from the environment is high
D.  the heat gained from the environment is low
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55 .An intrinsic semiconductor at absolute zero temperature is a
A.  Superconductor
B.  good conductor
C.  Perfect insulator
D.  none
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56 .A one - way relationship where one species benefits at the expense of another is called _____.
A.  Commensalism
B.  Competative exclusion
C.  Parasitism
D.  An obligatory relationship
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57 .With the increase in temperature, frequency of the sound from on organ pipe
A.  decreases
B.  increases
C.  remain unchanged
D.  changes erractically
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58 .The chipko Movement1. was an environmental movement toprevent cutting down of trees2. Raised the questions of ecological andeconomic exploitation3. Is a movement against alcoholism as itsbradened agenda?4. Demanded that local communitiesshould have control over their naturalresourcesSelect the correct answer using the codegiven below.
A.  1 and 2 only
B.  2 and 3 only
C.  1, 3 and 4 only
D.  1, 2, 3 and 4
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59 .The main source of enrgy in Sun is:
A.  Nuclear fusion
B.  Nuclear fission
C.  Chemical reaction
D.  Mechanical energy
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60 .The primary cell is a
A.  secondary cell
B.  primary cell
C.  both ( a ) and ( b )
D.  None of these
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