Second Year Physics Chapter 16 Online MCQ Test for 2nd Year Physics Chapter 16 Alternating Current Preparation

FSC Part 2 Physics
Chapter 16 Test

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Physics FSC Part 2 Chapter 16 Online MCQ's Test

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Question # 1

If the frequency of A.C. supplied is doubled then the capacitive reactance becomes.

Question # 2

In LR circiut which one of the following statements is correct?

Question # 3

The A.M. transmission frequencies range from

Question # 4

In frequency modulation which factor changed.

Question # 5

In Pakistan the frequency of A.C. supply is.

Question # 6

The phase difference between the current and voltage at resonce is:

Question # 7

The power factor of RL series circuit is.

Question # 8

The resonance frequency is given by:

Question # 9

The wave form of alternating voltage is a

Question # 10

Which consumes small power.

Question # 11

The highest value reached by the voltage or current is one cycle is called:

Question # 12

In purely resistive A.C circuit, instantaneous value of voltage and current:

Question # 13

The peak to peak value of alternating voltage is

Question # 14

In pure capacitor A.C. circuit, the current I and charge q are.

Question # 15

XL=

Question # 16

An in cudutor may store energy in

Question # 17

An A.C. voltmeter reads 220 V, its peak value will be

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FSc Part II Physics Chapter 0 Important MCQ's

Sr.# Question Answer
1 In LR circiut which one of the following statements is correct?
A. L and R opposes each other
B. R value increases with frequency
C. The inductive reactance increases with frequency
D. The inductive reactance decreases with frequency
2 In A.C circuit of inductor which one is true
A. Voltage leads current by phase angle π/2
B. Voltage lags current by π/2
C. Current leads voltage by π/2
D. Both remain in phase
3 In three phase voltage across any two lines is about.
A. 220 V
B. 230 V
C. 400 V
D. 430 V
4 When 10 V are applied to an A.C circuit, the current flowing in it is 100 mA. It impedance is.
A. 100 Ohm
B. 10 Ohm
C. 1000 Ohm
D. 1 Ohm
5 The A.M. transmission frequencies range from
A. 540 KHz to 1000 KHz
B. 540 Khz to 1600 KHz
C. 520 KHz TO 1600 KHz
D. 520 KHz TO 1400 KHz
6 The main reason for world wide use of A.C is because:
A. It is very high power 
B. It can be transmitted over long distance
C. It is cheaper to use
D. ALl of above
7 Power dissipation in A.C circuit is expressed as:
A. P =Irms x Vrms Sinθ
B. IxVCosθ
C. IrmsxVrmsCosθ
D. Irms x Vrms Sin2θ
8 The expression P = VI hold only when current and voltage are.
A. In phase
B. Out of phase
C. At right angle to each other
D. At angle of 120 o
9 The most common source of an A.C. Voltage is.
A. Motor
B. Cell
C. Generator
D. Thermo couple
10 Average value of current and voltage over a complete cycle is.
A. Positive
B. Negative
C. Zero
D. Infinite

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