Technical SI 2018 - Question 63

Any radiation of appropriate wavelength fall on the depletion layer of a p-n junction develops a potential difference between the junction is working principle of

a) Hall effect sensor

b) Proximity sensor

c) Light sensor

d) All the above

Correct Answer: Option C

Photodiodes generates electric current whenever light of appropriate wavelength falls on the junction. These type of diodes are used as photodetectors or light sensors. (e.g) PIN diode, Avalanche photodiode.

Technical SI 2018 - Question 63

Any radiation of appropriate wavelength fall on the depletion layer of a p-n junction develops a potential difference between the junction is working principle of

a) Hall effect sensor

b) Proximity sensor

c) Light sensor

d) All the above

Correct Answer: Option C

Photodiodes generates electric current whenever light of appropriate wavelength falls on the junction. These type of diodes are used as photodetectors or light sensors. (e.g) PIN diode, Avalanche photodiode.

TECHNICAL SI 2018 - Question 62

The function on an oscilloscope that 'locks in' waveforms so that they do not scroll horizontally across the screen is called the

a) Horizontal sync

b) Time base

c) Beam finder

d) Trigger

Correct Answer: Option D

Trigger function freezes the waveform that is getting displayed in the CRO screen. 

TECHNICAL SI 2018 - Question 62

The function on an oscilloscope that 'locks in' waveforms so that they do not scroll horizontally across the screen is called the

a) Horizontal sync

b) Time base

c) Beam finder

d) Trigger

Correct Answer: Option D

Trigger function freezes the waveform that is getting displayed in the CRO screen. 

TECHNICAL SI 2018 - Question 61

In superconductivity, the electrical resistance of material becomes

a) zero

b) infinite

c) finite

d) unity

Correct Answer: Option A 

Superconductivity - property of certain materials to conduct DC current without energy loss when they are cooled below certain temperature (critical temperature). 

No energy loss means, $I^2\;R\;t=0$. Here, $I$ and $t$ can't be zero. Hence $R=0$

TECHNICAL SI 2018 - Question 61

In superconductivity, the electrical resistance of material becomes

a) zero

b) infinite

c) finite

d) unity

Correct Answer: Option A 

Superconductivity - property of certain materials to conduct DC current without energy loss when they are cooled below certain temperature (critical temperature). 

No energy loss means, $I^2\;R\;t=0$. Here, $I$ and $t$ can't be zero. Hence $R=0$

Technical SI 2018 - Question 64

Superposition theorem is applicable for

a) Non linear circuits only

b) Linear circuits only

c) Linear and non linear circuits

d) None of these

Correct Answer: Option B

Technical SI 2018 - Question 64

Superposition theorem is applicable for

a) Non linear circuits only

b) Linear circuits only

c) Linear and non linear circuits

d) None of these

Correct Answer: Option B