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

Which one of the following waves belongs to electromagnetic spectrum

Question # 2

The waveform of alternating voltage is a:

Question # 3

A digital system deals with quantities or variables which have

Question # 4

If we connected the ordinary DC ammeter to measure alternating current, it would measure its:

Question # 5

When either L or C is increased, the resonant frequency of the RLC series circuit

Question # 6

For normal operation of transistor, the batteries

Question # 7

The basic circuit element in D.C. circuit is:

Question # 8

The bridge circuit of full wave rectification uses

Question # 9

A diode characteristic curve is a plot between

Question # 10

Conversion of alternating current into direct current is called

Question # 11

When the p-n junction is forward biased its resistance is of the order of

Question # 12

The impedance of RLC series resonance circuit at resonant frequency is

Question # 13

Which of the following diode is used to derive the current in external circuit when light is incident in the circuit

Question # 14

A changing magnetic flux creates around itself

Question # 15

When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:
A. Peak value
B. RMS value
C. Instantaneous value
D. Peak-to-peak value
2 In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. all of them
3 Nowadays, Most of the electric energy is produced by the A.C. generators using:
A. Hydal water
B. Geothermal energy
C. Solar energy
D. Biomass
4 A signal is amplified at the output without any change of phase, if it is applied at the
A. inverting input
B. non-inverting input
C. at any of the input
D. none of these
5 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
6 When the pn-junction is forward biased. the current flows through it is of the order of
A. mili-amperes
B. amperes
C. nano-amperes
D. micro-amperes
7 When the pn-junction is connected reversed biased, its resistance is of the order of
A. few ohms
B. few kilo-ohms
C. few mega-ohms
D. few mili-ohms
8 In half wave rectification
A. both halves of the input voltage is used
B. only one half of the input voltage is used
C. either of these
D. none of these
9 An A.C varies as a function of
A. Current
B. Voltage
C. Time
D. Charge
10 In describing functions of digital systems, a closed switch will be shown as
A. 0
B. 1
C. low
D. any one of these

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