Electronics and Communication Engineering - Digital Electronics

31. 

Which material is generally used for LED?

A. Compounds of silica
B. Compounds of gallium
C. Compounds of phosphorus
D. Compounds of sulphur

Answer: Option B

Explanation:

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32. 

The counter shown in the given figure is

A. Synchronous
B. Johnson
C. Ring
D. None of the above

Answer: Option D

Explanation:

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33. 

The number of bits in a nibble is

A. 8
B. 4
C. 2
D. 16

Answer: Option B

Explanation:

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34. 

When all the seven segments of a display are energized, the number shown is

A. 0
B. 1
C. 7
D. 8

Answer: Option D

Explanation:

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35. 

In digital computer programming, subroutines are used

A. to reduce program execution time at the expense of more memory
B. to reduce storage requirements
C. to increase programming ease and reduce storage requirements
D. because most of the functions are same

Answer: Option C

Explanation:

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