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MCQs

Total Questions : 71 | Page 5 of 8 pages
Question 41. When P = Power, V = Voltage, I = Current, R = Resistance and G = Conductance, which of the following relation is incorrect?
  1.    V = √ (PR)
  2.    P = V2G
  3.    G = P / I2
  4.    I = √ (P / R)
 Discuss Question
Answer: Option C. -> G = P / I2


G = P / I2


Question 42. Four identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be
  1.    1 / 16 times
  2.    1 / 4 times
  3.    4 times
  4.    16 times
 Discuss Question
Answer: Option A. -> 1 / 16 times


1 / 16 times


Question 43. Three equal resistors connected in series across a source of emf together dissipate 10 watts of power. What would be the power dissipated in the same resistors when they are connected in parallel across the same source of emf?
  1.    10 watts
  2.    30 watts
  3.    90 watts
  4.    270 watts
 Discuss Question
Answer: Option C. -> 90 watts


90 watts


Question 44. Which of the following is a defined quantity?
  1.    Pressure
  2.    Polarity
  3.    Money
  4.    Length
 Discuss Question
Answer: Option D. -> Length


The SI units are based on 7 defined quantities namely length, mass, time, electric current, thermodynamic temperature, amount of substance and also on the luminous intensity.


Question 45. The basic unit for luminous intensity is
  1.    Ampere
  2.    Candela
  3.    Coulomb
  4.    Radian
 Discuss Question
Answer: Option B. -> Candela


The unit for luminous intensity is candela and its symbol is cd.


Question 46. Which of the following is a correct relation?
  1.    Giga>Mega>Tera
  2.    Mega>Tera>Giga
  3.    Tera>Mega>Giga
  4.    Tera>Giga>Mega
 Discuss Question
Answer: Option D. -> Tera>Giga>Mega


Tera “ 1012


Question 47. How much resistance is required to limit the current from a 12 V battery to 3.6 mA?
  1.    33 k
  2.    2.2 k
  3.    22 k
  4.    3.3 k
 Discuss Question
Answer: Option D. -> 3.3 k
Question 48. What is the voltage source for a circuit carrying 2 A of current through a 36 resistor?
  1.    18 V
  2.    72 V
  3.    1.8 V
  4.    7.2 V
 Discuss Question
Answer: Option B. -> 72 V
Question 49. How much voltage is needed to produce 2.5 A of current through a 200 resistor?
  1.    8 V
  2.    50 V
  3.    500 V
  4.    80 V
 Discuss Question
Answer: Option C. -> 500 V
Question 50. When there is 12 mA of current through a 1.2 k resistor, the voltage across the resistor is
  1.    1.4 V
  2.    10 V
  3.    100 V
  4.    14.4 V
 Discuss Question
Answer: Option D. -> 14.4 V

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