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MCQs

Total Questions : 150 | Page 4 of 15 pages
Question 31. A simple machine helps a person in doing
  1.    less work
  2.    the same amount of work with lesser force
  3.    the same amount of work slowly
  4.    the same amount of work much faster
 Discuss Question
Answer: Option B. -> the same amount of work with lesser force
:
B
Option:(b)
Question 32. What does the term Dolby B or Dolby C printed on tape recorders and other sound systems refer to
  1.    Frequency Modulated System
  2.    Amplitude Modulated System
  3.    Noise Reduction Circuit
  4.    Both DC and AC power can be used
 Discuss Question
Answer: Option C. -> Noise Reduction Circuit
:
C
Option:(c)
Question 33. Domestic electrical wiring is basically a
  1.    series connection
  2.    parallel connection
  3.    combination of series and parallel connections
  4.    series connection within each room and parallel connection elsewhere
 Discuss Question
Answer: Option B. -> parallel connection
:
B
Option:(b)
Question 34. Assertion (A) : The boiling point of water decreases as the altitude increases,
Reason (R) : The atmospheric pressure increases with altitude.
  1.    Both A and R are true and R is the correct explanation of A
  2.    Both A and R are true but R is not a correct explanation of A
  3.    A is true but R is false
  4.    A is false but R is true
 Discuss Question
Answer: Option C. -> A is true but R is false
:
C
Option:(c)
Question 35. Match List I with List II and select the correct answer from the codes given below the lists.Match List I With List II And Select The Correct Answer From...   Codes:
  1.    A-2,B-1,C-3,D-4
  2.    A-3,B-4,C-2,D-1
  3.    A-4,B-3,C-1,D-2
  4.    A-4,B-3,C-2,D-1
 Discuss Question
Answer: Option C. -> A-4,B-3,C-1,D-2
:
C
Option:(c)
Question 36. What happens when water is cooled from 8°C to 0°C?
  1.    its volume decreases uniformly, becoming minimum at 0°C.
  2.    its density increases uniformly, attaining maximum value at 0°C.
  3.    its volume decreases up to 4°C and then increases.
  4.    its density decreases up to 4°C and then increases.
 Discuss Question
Answer: Option C. -> its volume decreases up to 4°C and then increases.
:
C
Option:(c)
Question 37. The temperature of the top of a frozen lake is -15°C. What is the temperature of the water in the lake in contact with the ice layer?
  1.    0°C
  2.    4°C
  3.    -15°C
  4.    -7.5°C
 Discuss Question
Answer: Option A. -> 0°C
:
A
Option:(a)
Question 38. In a sprayer the liquid rises in the tube due to
  1.    capillarity
  2.    evaporation
  3.    lower pressure at the upper end
  4.    unknown reasons
 Discuss Question
Answer: Option C. -> lower pressure at the upper end
:
C
Option:(c)
Question 39. Fish can survive inside a frozen lake because
  1.    fish are warm blooded animals
  2.    fish hibernate in ice
  3.    water near the bottom does not freeze
  4.    ice is a good conductor of heat
 Discuss Question
Answer: Option C. -> water near the bottom does not freeze
:
C
Option:(c)
Question 40. Inside an aeroplane, flying at a high altitude
  1.    the pressure is the same as that outside
  2.    normal atmospheric pressure is maintained by the use of air pumps
  3.    the pressure inside is less than the pressure outside
  4.    normal humidity and partial vacuum are maintained
 Discuss Question
Answer: Option B. -> normal atmospheric pressure is maintained by the use of air pumps
:
B
Option:(b)

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