# 12th Physics Unit 18 Chapter Wise Past Papers MCQs

12th Physics unit 18 electronics chapter-wise past papers MCQs. All MCQs from Intermediate Boards papers from 2014-2018. Download in pdf with answer keys.

## 12th Physics Unit 18 MCQs:

Rectification is the process of converting:
(A) D.C into A.C
(B) A.C into D.C

Automatic functioning of street lights can be done by the use of:
(A) Inductor
(B) Rectifier
(C) Comparator

In a photovoltaic cell, the current is directly proportional to:
(GRW. GI, 2014) (GRW. GII, 2015)
(A) Wavelength of light
(B)intensity of light
(C) frequency of light
(D) energy

Which is not a basic logic operation? (DGK. GI, 2014) (FBD. 2018)
(A) NOT
(B) AND
C) NAND
(D) OR

### Fsc Physics Part 2 Past Papers MCQs:

The truth table of logic function: (BWP. GI, 2016)
(A) Summarize its output values only
(B) Tabulates all its input conditions only
© Display all its input and output possibility
(D) Is not base on logic algebra.

Light-emitting diodes (LED) are made from semiconductors.
(LHR. GII, 2015)
(A) Silicon
(B) Germanium
(C) Carbon
(D) Gallium arsenide

A light-emitting diode (LED) emits light only when: (LHR. GI, 2015)
(A) Reverse biased
(B) Forward biased
(C) Unbiased
(D) None of these

The output of two-input OR gate is zero only when its: (AJK. GI, 2016)
(A) Both inputs are Zero
(B) Either input is zero
(C) Both inputs are one
(D) Either input is one

Logic gates can control some physical parameters like: (MLN. GII, 2017)
(A). Temperature, Pressure
(B) Resistance, Inductance
(C) Capacitance, Impedance
(D) Current, Voltage

#### Physics Chapter 18 Electronics:

The color of the light emitted by a LED depends on: (. GI, 2016)
(A) Its forward biase
(B) Its reverse biased
(C) Amount of forwarding current
(D) The type of semiconductor material used

Photo diode is used for detection of: (RWP. GI, 2017)
(A) Heat
(B) Magnet
(C) Current
(D) Light

The output of exclusive OR gate is X. (LHR. GII, 2014)
(B) AB+AB
(C) AB+ AB
(D) A.B + A.B

The Boolean equation for exclusive OR-gate is given by: (SWL. 2018)
(A) X = A.B + AB
(B) X= A.B + Ā.B
(C) X = A.B + A.B
(D) X = A.B + A.B

The number of terminals in a semiconductor diode is: (RWP. GI, 2017)
(A) 2
(B) 3
(C) 4
(D) 5

Which diode works at reverse biasing? (DGK. GII, 2017)
(A) LED
(B) Photo-voltaic cell
(C) Photo diode
(D) Silicon diode

#### 12th Physics Electronics Past Papers MCQs:

The boolean expression of NAND gate is: (FBD. GI, 2017)
(A) X = A.B
(B) X=Ā.B
(C) X = A.B
(D) X-A.B

The term invertor is used for: (MLN. GII, 2017)
(A) NOR gate
(B) NAND gate
(C) XNOR gate

A photo diode can turn its current ON and OFF: (MLN. GI, 2017)
(A) Micro seconds
(B) Mega seconds
(C) Nano seconds
(D) Milli seconds

Photo diode detects: (GRW. GI, 2017) (MLN. 2018)
(A) Visible light