MCQ
61. The power factor of a purely resistive circuit is---
Unity
Lagging
Zero
Leading
62. Kirchhoff's current law is applicable to only-
junctions
closed loop
electronic circuit
electrical circuit
63. Four capacitors each of 40µF are connected in parallel, the equivalent capacitance will be-
160µF
40µF
10µF
5µF
64. Ohm's Law is---
P = VI
V = IR
I^2R
P=V/R
65. A constant voltage is applied across the ends of a conductor. The heat produced is to--- length.
directly proportional
equal
inversely proportional
square
66. Rth নির্ণয়ের সময় সার্কিটে কনস্ট্যান্ট কারেন্ট সোর্সকে-
অপর ভোল্টেজ সোর্সের সাথে প্যারালেলে ব্যবহার করা হয়
সমতুল্য ভোল্টেজ সোর্সে রূপান্তরিত করা হয়
'শর্টস্' দ্বারা প্রতিস্থাপন করা হয়
'ওপেনস্' দ্বারা প্রতিস্থাপন করা হয়
67. 3V, 1Ω-এর একইরূপ দুটি ব্যাটারি একইরূপ পোলারিটিতে প্যারালেলে সংযোগ করা হলো। এ সমবায়ের নর্টন সমতুল্য সার্কিট হবে-
6Α, 1Ω
6Α, 0.5Ω
3Α, 0.5Ω
3Α, 1Ω
68. Two bulbs used at 25W, 110V and 100W, 110V are connected two series to a 230V supply. What will happend?
two bulb will burn out
two bulb will glow out
one bulb will glow out
one bulb will burn out
69. How much current flowing through a 100 ohmu resistor resulting 10 volt voltage drop?
0.1A
0.01A
10A
1000A
70. Kirchhoff's second law is based on law of conservation of-
charge
energy
momentum
mass
71. If de supply of 10V is fed to a differentiating circuits then output will be --
20V
0V
10V
none of the above
72. Two 10k Ω, 5W resistors in parallel have equivalent resistances of a 5ΚΩ and power rating of-
2.5W
5W
10W
25W
73. The r.m.s value of sinusoidal 100V peak to peak is-volt.
100/√2
50
50/√2
100
74. In a paralle ac circuit, power loss in due to--
conductance alone
susceptance alone
both conductance and susceptance
none of the above
75. Lamps used for house lighting are connected in-
series
mixed grouping
parallel
crossed
76. KCL is the conversion of-
voltage
current
energy
charge
77. A wire's resistance is 12 ohm. If it is divided into two parts and the parts are then connected in a parallel combination, what will be resistance?
3Ω
12Ω
24Ω
6Ω
78. The ratio of the resistance of a 100W, 220V lamp to that of a 100W 110V lamp will be nearly-
4
2
1/4
1/2
79. Four resistance of values 4, 8, 10 and 40 ohms respectively are joinedd in parallel. The equivalent resistance is ---
2.5Ω
2.0Ω
1.75Ω
2.25Ω
80. If the length and cross section of a piece of conductor are both doubled what will be its resistance (initial resistance R)?
4R
2R
R
1 /4 R