A 4 bit ripple counter starts in 0000 state. When the counter reads 0010 the number of clock pulses which have occurred is

A)
2
B)
18
C)
2 or 18
D)
2 or 18 or 34

Correct Answer : Option (D) :   2 or 18 or 34

Explanation : At pulse 1 the state changes to 0001 and at pulse 2 it changes to 0010 Since it has a total of 16 states, the counter returns to 0000 after 16 and 32 pulses.

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Two 16 : 1 and one 2 : 1 multiplexers can be connected to form a
A)
8 : 1 multiplexer
B)
16 : 1 multiplexer
C)
32 : 1 multiplexer
D)
64 : 1 multiplexer

Correct Answer :   32 : 1 multiplexer

If interrupt service request have been received from all of the following interrupts, then which one will be serviced last?
A)
RST 5.5
B)
RST 6.5
C)
RST 7.5
D)
None of the above

Correct Answer :   RST 5.5

Which liquid crystal is used for LCD display?
A)
Mercury
B)
Aqua regia
C)
Liquid boron
D)
Pneumatic fluid

Correct Answer :   Pneumatic fluid

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