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MCQs

Total Questions : 150 | Page 14 of 15 pages
Question 131. If water in a lake were to behave like other liquids, then in extremely cold weather it would freeze
  1.    from top to bottom
  2.    from bottom to top
  3.    simultaneously throughout the depth
  4.    first on the surface, bottom and sides and then in the interior
 Discuss Question
Answer: Option B. -> from bottom to top
:
B
Option:(b)
Question 132. The atmosphere exerts enormous pressure on us. But we do not feel it because
  1.    we are used to it
  2.    our bones are very strong and can withstand this pressure
  3.    the surface area of our head is very small
  4.    our blood exerts a pressure slightly more than that of the atmosphere
 Discuss Question
Answer: Option D. -> our blood exerts a pressure slightly more than that of the atmosphere
:
D
Option:(d)
Question 133. Consider the following statements
1.Atom bomb is based upon the principle of uncontrolled nuclear fusion
2.Hydrogen bomb is based upon the principle of uncontrolled nuclear fission
3.Nuclear reactor is based upon the principle of controlled nuclear fission
Which of the statements given above is/are correct?
  1.    3 only
  2.    1 and 2
  3.    2 and 3
  4.    1, 2 and 3
 Discuss Question
Answer: Option A. -> 3 only
:
A
Option:(a)
Question 134. The quality of a sound depends upon the
I) size of the vibrating body
II) material of the vibrating body
III)overtones produced
IV) shape of the vibrating body
  1.    I, II and III
  2.    I, II, III and IV
  3.    I and II
  4.    II, III and IV
 Discuss Question
Answer: Option B. -> I, II, III and IV
:
B
Option:(b)
Question 135. When two mercury drops are brought into contact, they merge to form a bigger drop because liquids have a tendency to possess
  1.    minimum volume
  2.    maximum surface area
  3.    minimum surface area
  4.    maximum volume
 Discuss Question
Answer: Option C. -> minimum surface area
:
C
Option:(c)
Question 136. A stone is thrown into a deep lake. As it sinks deeper and deeper into the water, the upthrust acting on it
  1.    increases
  2.    decreases
  3.    first decreases then increases
  4.    remains constant
 Discuss Question
Answer: Option D. -> remains constant
:
D
Option:(d)
Question 137. Assertion (A) : The temperature of a metal wire rises when an electric current is passed through it.Reason (R) : Collision of metal atoms with each other releases heat energy.
  1.    Both A and R are true and R is the correct explanation of A
  2.    Both A and R are true and 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 A. -> Both A and R are true and R is the correct explanation of A
:
A
Option:(a)
Question 138. A ball is dropped from the top of a high building with a constant acceleration of 9.8 m/s2. What will be its velocity after 2s ?
  1.    9.8 m/s
  2.    19.6 m/s
  3.    29.4 m/s
  4.    39.2 m/s
 Discuss Question
Answer: Option C. -> 29.4 m/s
:
C
Option:(c)
Question 139. What is the approximate mean velocity with which the earth moves round the sun in its orbit?
  1.    20 km/s
  2.    30 km/s
  3.    40 km/s
  4.    50 km/s
 Discuss Question
Answer: Option B. -> 30 km/s
:
B
Option:(b)
Question 140. Strips of two metals A and B are firmly jointed together as shown in the figure.
Strips Of Two Metals A And B Are Firmly Jointed Together As ...On heating, A expands more than B does. If this jointed strip is heated, then it will appear as
 Discuss Question
Answer: Option B. -> 30 km/s
:
B
Option:(b)

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