Ohm's Law Multiple choice Question (Electrical Mcqs) and Answer Part 7
Electrical Engineering Objective Question and Answer
121- The number 3 in colour code is
(A) Blue
(B) Orange
(C) Grey
(D) Violet
Answer: (B)
122-
The Ohm's law condition is
(A) Temperate at positive end should be more than the temperature at negative end
(B) current should be proportional to the size of resistance
(C) resistance must be wire wound type
(D) resistance must be uniform
Answer: (D)
123- Which figure is according to Ohm's law
Answer: (B)
124- Production of heat due to current is related by which law
(A) Ohm's law
(B) Joule's law
(C) Kelvin's Law
(D) Maxwell's law
Answer: (B)
125- A fixed resistance r is connected across a DC voltage source, if the voltage is gradually and uniformally increased , the relationship between voltage and resistance is correctly represented by which figure
Answer: (A)
126- The load in given circuit can have maximum power of
(A) 3 watts
(B) 6 watts
(C) 6.75 watts
(D) 13.5 watts
Answer: (C)
127- The resistance of variable resistance connected in a circuit having a source voltage V, which figure represent the true relationship between R and I,
Answer: (B)
128- A resistor of 1 kilo watt with a resistance of 1 kilo ohm can have maximum current of
(A) 30 mA
(B) 100 mA
(C) 150 mA
(D) 500 mA
Answer: (A)
129- The copper wire resistance with flow of current
(A) Increases as the length of wire decreases
(B) decreases as the diameter of wire decreases
(C) increases as the length of wire increases
(D) decreases as the length of wire increases
Answer: (C)
130- if the voltage is same ,than the following ratio will become
(A) 1
(B) 4
(C) 16
(D) 1/4
Answer: (D)
131-
The Voltage drop across a resistor of 100 ohm is 10 volts. the wattage of the resistor must be
(A) 1/2 W
(B) 1 W
(C) 2 W
(D) 4 W
Answer: (B)
132- A 100 volt bulb has resistance of 500 ohm. The number of hours it can work for every KWh of energy consumed will be
(A) 20
(B) 40
(C) 50
(D) 60
Answer: (C)
133- Semi conductor is defined as
(A) one which conducts only half of the applied voltage
(B) A material whose conductivity is same as between that of a conductor and an insulator
(C) A material made of alternate layers of conducting material and insulator
(D) A material which has conductivity having average value of conductivity of metal and insulator
Answer: (B)
134- Two resistors R 1 = 47 kilo ohm , 1 watt and R 2 = 0 ohm , 1 W are connected in parallel , The combined value will be
(A) 47 kilo ohm, 1 watt
(B) 47 kilo ohm , 2 watt
(C) 47 kilo ohm ,1/2 W
(D) 0 k ohm , 1 W
Answer: (D)
135- The difference between Rheostat and potentometer in the respect that
(A) rheostat has large number of turns
(B) rheostat has large number of tapping
(C) rheostat has lower wattage rating
(D) rheostat has higher wattage ratings
Answer: (D)
136- The equivalent resistance between X 1 and X 2 is
(A) 60 ohm
(B) 40 ohm
(C) 80 ohm
(D) 20 ohm
Answer: (B)
137- For the same electrical resistance, the weight of aluminium conductor as compared to copper conductor of identical cross-section is
(A) 85%
(B) 50%
(C) 20%
(D) 120%
Answer: (B)
138- A drawn wire of resistance 25 ohm is further drawn so that its diameter becomes on fifth.Its resistance will now be
(A) 625 ohm
(B) 125 ohm
(C) 25 ohm
(D) 1 ohm
Answer: (A)
139- Which have negative resistance
(A) wire wound resistance
(B) Metals
(C) Non-metals
(D) Thermistor
Answer: (D)
140- The current through a circuit as function of t is given by
i(t) = -3 +t
The total charge passing a point between t =99 and t = 102 sec will be
(A) 112 coulombs
(B) 242.5 coulombs
(C) 292.5 coulombs
(D) 345.6 coulombs
Answer: (C)
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