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

A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at

Question # 2

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

Question # 3

Peak value of alternative current is:

Question # 4

Electromagnetic waves transmit energy equal to

Question # 5

The time interval during which the Voltage source changes its polarity once is known as:

Question # 6

The alternative voltage of current is actually measured by:

Question # 7

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

Question # 8

SI unit of impedance is

Question # 9

The bridge circuit of full wave rectification uses

Question # 10

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

Question # 11

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

Question # 12

The output voltage of half wave rectification is in the form of

Question # 13

The entire wave form of sinusoidal voltage is actually a set of all the:

Question # 14

Transmitting antenna emits

Question # 15

Alternating current is produced by a voltage source which polarity:

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The output voltage of half wave rectification is in the form of
A. a smooth curve
B. a smooth wave
C. pulses
D. all of the above
2 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
3 At resonance, the impedance of RLC series circuit is
A. Maximum
B. Zero
C. Minimum
D. Determinate
4 A p-n junction is formed when a crystal of silicon is growth in such a way that its one half is doped with trivalent impurity and the other half with a impurity from
A. 2nd group
B. fourth group
C. fifth group
D. sixth group
5 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
6 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
7 Electromagnetic waves transmit energy equal to
A. 1/2 mv2
B. moc2
C. hf/c
D. hf
8 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
9 When the emitter-base junction of a transistor is reverse biased, collector current
A. Reverses
B. Increases
C. Decreases
D. Stops
10 During the negative half-cycle of the half-wave rectification, the diode
A. does not conduct
B. conducts
C. either of these
D. none of these

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