basic electrical Mcqs
101. One newton meter is same as_____________?
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A. one watt

B. one joule second

C. five joules

D. one joule
102. Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as________?
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A. 25:04:00

B. 2 : 5

C. 5:02

D. 4:25

103. 1 angstrom is equal to______________?
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A. 10-8 mm

B. 10?10 m

C. 10?6 cm

D. 10~14 m

104. An open resistor, when checked with an ohm-meter reads_____________?
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A. low but not zero

B. zero

C. infinite

D. high but within tolerance

105. The condition for the validity under Ohms law is that_______________?
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A. current should be proportional to the size of the resistance

B. resistance must be wire wound type

C. temperature at positive end should be more than the temperature at negative end

D. resistance must be uniform
106. A rheostat differs from potentiometer in the respect that it_____________?
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A. offers large number of tapping

B. has large number of turns

C. has higher wattage rating

D. has lower wattage rating

107. Which method can be used for absolute measurement of resistances _______________?
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A. Lorentz method

B. Releigh method

C. Ohms law method

D. Wheatstone bridge method

108. All good conductors have high____________?
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A. conductance

B. resistance

C. reluctance

D. thermal conductivity

109. An electric filament bulb can be worked from____________?
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A. All above

B. Battery supply only

C. A. C. supply only

D. D. C. supply only

110. Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be_________________?
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A. 9 times

B. 3 times

C. 1/9 times

D. 1/3 times

111. When a voltage of one volt is applied, a circuit allows one micro ampere current to flow through it. The conductance of the circuit is___________?
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A. 106 mho

B. 1 n-mho

C. none of the above

D. 1 milli-mho

112. Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners ___________?
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A. 8/3 Q

B. 6 Q

C. 3/2 Q

D. 4 Q
113. In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains______________?
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A. length of heating element should be decreased

B. length of heating element should be increased

C. length of heating element has no effect on heating if water

D. none of the above

114. The ratio of mass of proton to that of electron is nearly_____________?
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A. 1840

B. 4

C. 1840

D. 30

115. With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals_____________?
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A. 20 W

B. 40 W

C. 60 W

D. 10 W

116. If the efficiency of a machine is to be high, what should be low __________?
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A. Ratio of output to input

B. Losses

C. kWh consumed

D. Input power

E. True component of power

117. Voltage dependent resistors are usually made from________________?
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A. Nichrome

B. Graphite

C. Charcoal

D. Silicon Carbide
118. Electric current passing through the circuit produces_____________?
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A. luminous effect

B. all above effects

C. chemical effect

D. thermal effect

E. magnetic effect

119. The number of electrons in the outer most orbit of carbon atom is___________?
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A. 3

B. 7

C. 4

D. 6

120. When electric current passes through a bucket full of water, lot of bubbling is observeD. This suggests that the type of supply is____________?
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A. D. C.

B. any of above two

C. A. C.

D. none of the above