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MCQ
3621. An external resistance R is connected to a cell of internal resistance r. The maximum current flows in the external resistance when-
R<r
R=r
R>r
None of the above
3622. The total resistance of circuit by connecting 50 resistance of 1/4 Ω in parallel is---
50/4Ω
200Ω
4/50Ω
1/200Ω
3623. The internal resistance of a cell of e.m.f 2V is 0.1Ω It is connected to a resistance of 3.9Ω. The voltage across the cell is-
0.5V
1.9V
1.95V
2V
3624. Two resistors of 18Ω and 5Ω are connected in series to a 230 volt supply. The current is-
12A
10A
10.5A
9.5A
3625. Kirchhoff's current law is applicable to only-
junctions
closed loop
electronic circuit
electrical circuit
3626. মাইক্রোওয়েভ ওভেনের কুকিং সুইচ অন করলে কী কী সক্রিয় হয়?
ব্লোয়ার মোটর
কুকিং রিলে
ম্যাগনেট্রন টিউব
সবগুলো
3627. Kirchhoff's current law at a junction deals with-
Conversation of energy
Conversation of momentum
Conversation of charge
Conversation of angular momentum
ব্যাখ্যা: Kirchhoff's Current Law (KCL) is Kirchhoff's first law deals with the conservation of charge entering and leaving a junciton
3628. Two equal resistances are connected in series across a certain supply. If the resistances are now connected in parallel, the power produced will become-
two-times
four times
one-half
one-fourth
ব্যাখ্যাঃ if two equal resistance connected in series across a certain supply are now connected in parallel across the same supply, the power produced will be four times that of series connection.
3629. Three resistance 14.5Ω, 25.5Ω and 60Ω are connected in series across 200V. What will be the voltage drop across 14.5Ω?
29V
14V
13.5V
18V
3630. What will be the internal resistance of cell, if it supplies 0.9A current through 2Ω resistor and 0.3A current through 7Ωresistor?
0.9Ω
1.2Ω
0.5Ω
1Ω
3631. A 50V battery is connected across 10Ω resistor. The current is 4.5 A. The internal resistance of the battery is-
zero
0.5Ω
5Ω
1.1Ω
3632. Electrical appliances are connected in parallel because it-
Is a simple circuit
Draws less current
Results in reduced power loss
Makes the operation of appliances independent of each other
3633. A wire has a resistance of 122. It is bent in the form of a circle. The effective resistance between the two points on any diameter of the circle is--
6Ω
12Ω
3Ω
24Ω
3634. ডি-হিউমিডিফায়ারের কাজ কী?
বাতাসের আর্দ্রতা কমায়
তাপমাত্রা নিয়ন্ত্রণ করে
উভয় কাজ করে
কোনোটিই না
ইলেকট্রিক ডিহিউমিডিফায়ারের কাজ হলো বাতাসের জলীয়কণা শোষণ করে এবং আর্দ্রতাকে কমিয়ে ঘর, আসবাবপত্র ও যন্ত্রপাতিকে রক্ষা করা।
3635. What will be the current in 2 seconds from a wire of having 10 mC charge flow and 2.5mm cross sectional area?
25mA
5mA
20mA
4mA
3636. Permeability in a magnetic circuit corresponds to--in electric circuit.
conductivity
conductance
resistivity
resistance
3637. Kirchhoff's voltage law deals with—
Conversation of energy
Conversation of momentum
Conversation of charge
Conversation of angular momentum
3638. । মাইক্রোওয়েভ ওভেনে কোন ধরনের মোটর ব্যবহার করা হয়?
ইন্ডাকশন মোটর
সিনক্রোনাস মোটর
ব্লোয়ার মোটর
সিরিজ মোটর
3639. The true statement for a series and a parallel de circuit is--
powers are additive
current are additive
element have individual current
voltage are additive
ব্যাখ্যা: Powers are additive in both series and Parrallel. Currents are additive in parallel circuits whereas voltages are additive in series circuit.
3640. What happens if an electric bulb rated at 220V is connected to 220V, 5 Hz ac source? The bulb-
does not glow
fuses
glows continuously
glows intermittently
ব্যাখ্যাঃ When you give 5Hz supply, frequency is too low. Normally when 50 Hz (50 times a second AC is given, it will get max volts twice in each cycle, that is it gets varing voltage from 0 to 220'a hundred times a second, in negative and positive cycles), the white hot blulb filament has no time to cool. Hence it appears to us as glowing continuously. But when you drastically reduce to 5 Hz it has times to cool off and again get white when hot. You will observe the blub will flash at rate of 10 times per seconde