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ডিসি সার্কিট MCQ
42. 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
43. 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
44. 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
45. A 40W bulb is connected in parallel with room heater. What will happen if we turn off bulb?
Heater output will increase
Heater output will decrease
Heater output will remains same
None of the above
46. 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
48. If a galvanometer is open circuited in a balanced Wheatstone bridge, the current in various resistors of Wheatstone bridge will---
Increase
Decrease
Not change
Cannot say anything
49. The resistance of each arm of Wheatstone bridge is 10 Ω. A resistance of 10Ω is connected in series with the galvanometer. The equivalent resistance across the battery will be-
40 Ω
20 Ω
30 Ω
10 Ω
51. 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--
12Ω
24Ω
52. Kirchhoff's voltage law deals with—
Conversation of energy
Conversation of momentum
Conversation of charge
Conversation of angular momentum
54. 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
55. 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
56. Kirchhoff's current law at a junction deals with-
Conversation of energy
Conversation of momentum
Conversation of charge
Conversation of angular momentum
57. 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
59. 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