Physics Practice MCQ Page 39
Multiple Choice questions for Physics in the sets of 10 each on one page with questions and answers. All sets are useful in the preparation of subject tests for employment or admission.
Question: 3781 A freshly prepared radioactive source of half life 2 h emits radiation of intensity which is 64 times the permissible safe level. The minimum time after which it would be possible to work safely with this source is
- 6 h
- 12 h
- 24 h
- 128 h
Question: 3782 Unstable particles heavier than protons are
- leptons
- K-mesons
- strange particles
- hyperons
Question: 3783 Transuranic elements are those
- which have atomic number as 92
- which have atomic number more than 92
- which have atomic number less than 92
- none of the above
Question: 3784 A signal voltage is applied to the grid of a triode in a circuit containing plate load resistance, when the signal voltage applied to grid is at its maximum value?
- the plate current is maximum
- the plate current is zero
- the plate current is zero
- the voltage on the plate must be at its maximum instantaneous value
Question: 3785 In case of p-n junction diode at high value of reverse bias, current rises sharply. this value of reverse bias is called
- cut off voltage
- inverse voltage
- zener voltage
- critical voltage
Question: 3786 What will be the amplification factor of a triode valve, the valve of whose slopes of mutual and anode characteristics are 2.4 m AV-1 and sd0.05m AV respectively?
- 4.8
- 48
- 1480
- 0.48
Question: 3787 a typical acceptor atom in P-type germanium has how many valence electrons?
- 1
- 3
- 4
- 5
Question: 3788 In the active region operation of a transistor
- the collector and emitter junctions are forward biased
- the collector and emitter junctions are reverse biased
- the collector junction is forward biased and the emitter junction is reverse biased
- the collector junction is reverse biased and emitter junction forward biased
Question: 3789 In the operation of PNP transistor compared to that of a triode, the N base acts as
- emitter
- cathode
- grid
- plate
Question: 3790 In the active region operation of a transistor
- the collector and emitter junctions are forward biased
- the collector and emitter junctions are reverse biased
- the collector junction is forward biased and the emitter junction is reverse biased
- the collector junction is reverse biased and emitter junction forward biased
Question: 3791 In class A amplifiers, current load flows for
- full-cycle of the signal
- half-cycle of the signal
- one-fourth cycle of the signal
- all are true
Question: 3792 Which of the following electronic devices is used for digital displays in electronic calculators?
- photodiodes
- zener diodes
- LEDs
- SRCs
Answers to the questions of Physics on this page
Following list gives the correct choice for the answer of the Physics mcqs.
3781 . B
3782 . D
3783 . B
3784 . B
3785 . C
3786 . B
3787 . B
3788 . D
3789 . C
3790 . D
3791 . B
3792 . C
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MCQ for Practicing Subject Tests