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

Electromagnetic waves transmit energy equal to

Question # 2

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

Question # 3

When the emitter-base junction of a transistor is reverse biased, collector current

Question # 4

The Instantaneous value of alternative current maybe:

Question # 5

Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:

Question # 6

If 250V is the RMS value of alternative voltage, then its peak value Vowill be:

Question # 7

A signal is amplified at the output without any change of phase, if it is applied at the

Question # 8

The highest value reached by the voltage or current:

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

In frequency modulation (FM), the carrier waves amplitude

Question # 13

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

Question # 14

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

Question # 15

A digital system deals with quantities or variables which have

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ECAT Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 The value of output resistance of OP-AMOP is of the order of
A. few ohms
B. few hundred ohms
C. several kilo ohms
D. several mega ohms
3 Which of the following has a great concentration of impurity
A. base
B. emitter
C. collector
D. none of these
4 In a transistor, the central region is called
A. collector
B. emitter
C. base
D. none of them
5 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
6 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
7 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°
8 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
9 In a transistor, if the central region is n-type, then this type of transistor is known as
A. n-p-n transistor
B. p-n-p transistor
C. either of these
D. none of these
10 When the p-n junction is forward biased its resistance is of the order of
A. few mega ohms
B. few kilo ohms
C. few ohms
D. few milli ohms

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