ECAT Pre Engineering Physics Chapter 16 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 16 Alternating Current

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

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Physics ECAT Pre Engineering Chapter 16 Alternating Current

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Question # 1

The input resistance of the OP-AMP is the resistance between the

Question # 2

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

Question # 3

SI unit of impedance is

Question # 4

The R1= infinity and R2= 0, then the gain of non-inverting amplifier is

Question # 5

Transmitting antenna emits

Question # 6

The device which allows only the flow of an A.C. through a circuit is

Question # 7

Alternating current is produced by a voltage source which polarity:

Question # 8

The impedance of RLC series resonance circuit at resonant frequency is

Question # 9

An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current

Question # 10

During the negative half-cycle of the half-wave rectification, the diode

Question # 11

In half wave rectification

Question # 12

In describing functions of digital systems, a closed switch will be shown as

Question # 13

Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length

Question # 14

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

Question # 15

OP-AMP has the following input terminals

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 If we connected the ordinary DC ammeter to measure alternating current, it would measure its:
A. Instantaneous value
B. RMS value
C. Value averaged over a cycle
D. Either (B) or (C)
2 Mathematical manipulation of the two quantized states can be best carried if they are represented by
A. high - low
B. yes - no
C. on - off
D. 0 - 1
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 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
5 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
6 Which of the following diode is used to derive the current in external circuit when light is incident in the circuit
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. none of these
7 When either L or C is increased, the resonant frequency of the RLC series circuit
A. Increases
B. Decreases
C. Remains the same
D. Becomes zero
8 Which one of the following waves belongs to electromagnetic spectrum
A. Radio and TV waves
B. Radar waves
C. Micro waves
D. All of them
9 During each cycle, alternating voltage reaches a peak value
A. One time
B. Two times
C. Four times
D. A number of times depending on the frequency
10 In free space, the speed of electromagnetic waves is
A. 3 x 108ms-1
B. 3 x 106ms-1
C. 4 x 107ms-1
D. 3 x 109ms-1

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