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MCQs

Total Questions : 219 | Page 10 of 22 pages
Question 91. The ratio of mass of proton to that of electron is nearly
  1.    1840
  2.    1480
  3.    30
  4.    4
 Discuss Question
Answer: Option A. -> 1840
Question 92. Three resistances of 10 ohms, 15 ohms and 30 ohms are connected in parallel.The total resistance of the combination is
  1.    5 ohms
  2.    10 ohms
  3.    15 ohms
  4.    55 ohms
 Discuss Question
Answer: Option A. -> 5 ohms
Question 93. Switching of a lamp in house produces noise in the radio. This is because switching operation produces
  1.    Arcs across separating contacts
  2.    Mechanical noise of high intensity
  3.    Both mechanical noise and arc between contacts
  4.    None of the above
 Discuss Question
Answer: Option A. -> Arcs across separating contacts
Question 94. Which of the following statement is true?
  1.    A galvanometer with low resistance in parallel is a voltmeter
  2.    A galvanometer with high resistance in parallel is a voltmeter
  3.    A galvanometer with low resistance in series is an ammeter
  4.    A galvanometer with high resistance in series is an ammeter
 Discuss Question
Answer: Option C. -> A galvanometer with low resistance in series is an ammeter
Question 95. The four bulbs of 40 W each are connected in series swift a battery across them, which of the following statement is true?
  1.    The current through each bulb in same
  2.    The voltage across each bulb is not same
  3.    The power dissipation in each bulb is not same
  4.    None of the above
 Discuss Question
Answer: Option A. -> The current through each bulb in same
Question 96. A glass rod when rubbed with silk cloth is charged because
  1.    It takes in proton
  2.    Its atoms are removed
  3.    It gives away electrons
  4.    It gives away positive charge
 Discuss Question
Answer: Option C. -> It gives away electrons
Question 97. Insulating materials have the function of
  1.    Preventing a short circuit between conducting wires
  2.    Preventing an open circuit between the voltage source and the load
  3.    Conducting very large currents
  4.    Storing very high currents
 Discuss Question
Answer: Option B. -> Preventing an open circuit between the voltage source and the load
Question 98. When electric current passes through a bucket full of water, lot of bubbling is observed. This suggests that the type of supply is
  1.    A.C.
  2.    D.C.
  3.    Any of above two
  4.    None of the above
 Discuss Question
Answer: Option B. -> D.C.
Question 99. A substance whose molecules consist of dissimilar atoms is called
  1.    Semiconductor
  2.    Super-conductor
  3.    Compound
  4.    Insulator
 Discuss Question
Answer: Option C. -> Compound
Question 100. If a parallel circuit is opened in the main line, the current
  1.    Increases in the branch of the lowest resistance
  2.    Increases in each branch
  3.    Is zero in all branches
  4.    Is zero in the highest resistive branch
 Discuss Question
Answer: Option C. -> Is zero in all branches

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