Online Computer Science Test - Digital Computer Electronics Test

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Total number of questions: 20.
Time allotted: 30 minutes.
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What logic function is obtained by adding an inverter to the inputs of an AND gate?

NAND

XOR

NOR

None of the above

[#]

An inverter is also called a _____ gate.

NOT

AND

NAND

None of the above

[#]

How many inputs signals can a gate have?

one

more than one

two only

both (a) and (b)

None of the above

[#]

An OR gate has 6 inputs. What is the only input word that produces a 0 output?

000000

000111

111000

111111

None of the above

[#]

The simplified form of the Boolean expression (X + Y + XY)(X + Z) is

X + Y + Z

XY + YZ

X + YZ

XZ + Y

None of the above

[#]

Conversion of decimal number 61₁₀ to it's binary number equivalent is

110011₂

11001110₂

111101₂

11111₂

None of the above

[#]

Conversion of decimal number 13₁₀ to it's octal number equivalent is

15₈

17₈

13₈

11₈

None of the above

[#]

Conversion of binary number 101101₂ to hexadecimal is

37₁₆

2D₁₆

2E₁₆

27₁₆

None of the above

[#]

In boolean algebra, the times sign stands for the _____ operation

AND

NAND

NOR

None of the above

[#]

10.

The memory cell of a dynamic RAM is simpler and smaller than the memory cell of a _____ RAM.

volatile

static

semiconductor

bipolar

None of the above

[#]

11.

A byte is consist of _____ bits

two

four

eight

ten

None of the above

[#]

12.

The OR gate has two or more input signals. If any input is _____ the output is high.

low

high

All of the above

None of the above

[#]

13.

How many outputs signals can a gate have?

one

more than one

two only

both (a) and (b)

None of the above

[#]

14.

The two basic technologies for digital ICs are bipolar and MOS. Bipolar technology is preferred for_____ and _____ whereas MOS technology is better suited to LSI.

SSI, MSI

MSI, LSI

SSI, LSI

ECL, DTL

None of the above

[#]

15.

The _____ is ultraviolet-light-erasable and electrically programmable. This allows the user to erase and store until programs and data are perfected.

EPROM

ROM

PROM

RAM

None of the above

[#]

16.

Which of the following is not functionally a complete set?

AND, OR

NAND

NOR

AND, OR, NOT

None of the above

[#]

17.

The octal equivalent of decimal 324.987 is

504.771

640.781

815.234

90.987

None of the above

[#]

18.

What is the ASCII code for T?

1010100

1011010

1011100

1011111

None of the above

[#]

19.

_____is an abbreviation for binary digit.

0 and 1

bingit

base

bit

None of the above

[#]

20.

Conversion of hexadecimal number 1D7F₁₆ to a decimal number is

7551₁₀

8771₁₀

5557₁₀

7781₁₀

None of the above

[#]

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Online Computer Science Test - Digital Computer Electronics Test

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