ECAT Pre Computer Science Chapter 16 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 16 Alternating Current

Try The MCQ's Test For ECAT Physics Chapter 16 Alternating Current

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ECAT Physics Chapter 16 Alternating Current

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Question # 1

At resonance, the phase angle for RLC series resonance circuit equals

Question # 2

At higher frequency of the alternating current, the capacitive reactance Xc

Question # 3

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

Question # 4

The sum of positive and negative peak values is called:

Question # 5

The average of A.C. current and voltage over a complete cycle is

Question # 6

In an A.C circuit with resistor only, the current and voltage have a phase angle of

Question # 7

Which of the following has a great concentration of impurity

Question # 8

The wave form of alternating voltage is the graph between:

Question # 9

A changing magnetic flux creates around itself

Question # 10

In frequency modulation (FM), the carrier waves amplitude

Question # 11

Transmitting antenna emits

Question # 12

When the pn-junction is in reversed biased, current flows through the junction due to the

Question # 13

In series RC circuit when R=Xc, then the phase angle is

Question # 14

In a transistor, if the central region is n-type, then this type of transistor is known as

Question # 15

Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The r.m.s. value of alternating current is equal to its maximum value at angle of
A. 60°
B. 45°
C. 30°
D. 90°
2 The basic circuit elements of A.C circuit are
A. Resistor
B. Inductor
C. Capacitor
D. All the three
3 Electromagnetic waves transmit energy equal to
A. 1/2 mv2
B. moc2
C. hf/c
D. hf
4 The value of the potential difference across the depletion region for the case of germanium is
A. 0.3 V
B. 0.5 V
C. 0.7 V
D. 0.9 V
5 For normal operation of transistor, the batteries
A. VCCis of much lower value than VBB
B. VCCis of much higher value than VBB
C. VCC is equal toVBB
D. none of these
6 Chock consumes externally small
A. Charge
B. Current
C. Power
D. Potential
7 Which of the following diode is used for the detection of light
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. all of them
8 At higher frequency of the alternating current, the capacitive reactance Xc
A. Increases
B. Decreases
C. Remains the same
D. Increases only when the voltage increases
9 The alternative voltage of current is actually measured by:
A. Its RMS value
B. Square root of its mean square value
C. Instantaneous value
D. Peak value
10 The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its
A. Icwill decrease
B. VCEwill increase
C. ICwill increase
D. VCCwill increase

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  • Iiqra Fatima

    Iiqra Fatima

    25 May 2018

    You should let us practice difficult mcqs ..These are too easy for ECAT level....Thanku

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