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MCQs

Total Questions : 219 | Page 3 of 22 pages
Question 21. In the case of direct current
  1.    Magnitude and direction of current remains constant
  2.    Magnitude and direction of current changes with time
  3.    Magnitude of current changes with time
  4.    Magnitude of current remains constant
 Discuss Question
Answer: Option A. -> Magnitude and direction of current remains constant
Question 22. In a lamp load when more than one lamp are switched on the total resistance of the load
  1.    Increases
  2.    Decreases
  3.    Remains same
  4.    None of the above
 Discuss Question
Answer: Option B. -> Decreases
Question 23. Electric pressure is also called
  1.    Resistance
  2.    Power
  3.    Voltage
  4.    Energy
 Discuss Question
Answer: Option C. -> Voltage
Question 24. A 3 Q resistor having 2 A current will dissipate the power of
  1.    2 watts
  2.    4 watts
  3.    6 watts
  4.    8 watts
 Discuss Question
Answer: Option C. -> 6 watts
Question 25. The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other?
  1.    18 Q
  2.    36 Q
  3.    48 Q
  4.    64 Q
 Discuss Question
Answer: Option B. -> 36 Q
Question 26. The hot resistance of the bulb's filament is higher than its cold resistance because the temperature coefficient of the filament is
  1.    Zero
  2.    Negative
  3.    Positive
  4.    About 2 ohms per degree
 Discuss Question
Answer: Option C. -> Positive
Question 27. With rise in temperature the resistance of pure metals
  1.    Increases
  2.    Decreases
  3.    First increases and then decreases
  4.    Remains constant
 Discuss Question
Answer: Option A. -> Increases
Question 28. Voltage dependent resistors are used
  1.    For inductive circuits
  2.    To suppress surges
  3.    As heating elements
  4.    As current stabilizers
 Discuss Question
Answer: Option B. -> To suppress surges
Question 29. Which of the following statement is correct?
  1.    A semiconductor is a material whose conductivity is same as between that of a conductor and an insulator
  2.    A semiconductor is a material which has conductivity having average value of conductivity of metal and insulator
  3.    A semiconductor is one which conducts only half of the applied voltage
  4.    A semiconductor is a material made of alternate layers of conducting material and insulator
 Discuss Question
Answer: Option A. -> A semiconductor is a material whose conductivity is same as between that of a conductor and an insulator
Question 30. Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct?
  1.    100 W lamp will glow brighter
  2.    40 W lamp will glow brighter
  3.    Both lamps will glow equally bright
  4.    40 W lamp will fuse
 Discuss Question
Answer: Option B. -> 40 W lamp will glow brighter

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