Checked by:_______________ Rechecked by:_____________ Sign Invigilator:_____________
Q1. Circle the correct answer. (10)
1.The process of emission of electrons from the hot metal surfaces is called:
a) electronic emission b) thermeonic emission c) field emission d) none of these
2.AND operation is represented by:
a) + b) – c) * d) x
3.Digital electronics are preferred to analogue electronics because of:
a) loss of strength of signal in analogue electronics b) excellent picture quality c) storage of large amountof data in a small d) all of these
4.Those quantities whose values vary non-continuous manner are called.
a) variable b) current c) analogue d) digital
5.Which of the following is a digital device:
a) a moving coil voltmeter b) a microphone generating current
c) central heating thermostat d) automatic traffic lights
6.X=A.B is read as:
a) X = A AND B b) X = A OR B c) X = A NOT B d) X = A NAND B
7.Which of the following is not an is example of an analogue quantities?
a) temperture b) time c) pressure d) none of these
8.The process of transforming information into ‘1s’ and ‘0s’ is called:
a) digitization b) ionization c) logic operation d) electricity
a) analogue into a digital signal b) digital into a analogue signal
c) conventional into actual current d) anode into cathode
10.Temperature is a ………………quantity.
a) digital b) analogue c) constant d) vector
Q2 .Write short answers to these questions: (15)
1.What is NOT operation? Write down its truth table and draw its symbol.
2.Explain briefly the working parts of CRO.
3.Write down the names of universal logic gates.
4.Considering an Oscilloscope, explain why filament is heated?
5.What happen when a narrow beam of electrons is passing through a uniform magnetic field.