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Home » GAT Subject » Computer Science » Aptitude Test - 35
1.Address 200H contains the byte 3FH. What is the decimal equivalent of 3FH
A. 63
B. 32
C. 16
D. 63
2.Conversion of an octal number 1128 to hexadecimal number is
A. 4A16
B. 5A16
C. 1516
D. 4A16
3.The functional difference between SR flip-flop and JK flip-flop is that
A. JK flip-flop is faster than SR flip-flop
B. JK flip-flop has a feed back path
C. JK flip-flop accepts both inputs 1
D. JK flip-flop is faster than SR flip-flop
4.The inverter OR gate and AND gate are called decision-making elements because they can recognize some input _____ while disregarding others. A gate recognizes a word when its output is _____
A. words, high
B. bytes, low
C. bytes, high
D. words, high
5.A positive AND gate is also a negative
A. NAND gate
B. NOR gate
C. AND gate
D. NAND gate
6.In which code the successive code characters differ in only one bit position?
A. gray code
B. excess 3 code
C. 8421 code
D. gray code
7.Conversion of binary number 1011012 to hexadecimal is
A. 3716
B. 2D16
C. 2E16
D. 3716
8.ASCII and EBCDIC differ in
A. their efficiency in storing data
B. the random and sequential access method
C. the number of bytes used to store characters
D. their efficiency in storing data
9.A p- channel enhancement type MOSFET performs much the same function as a PNP transistor, except that
A. it operates much faster
B. it is considerably larger
C. it is controlled by voltage rather than by current, so that it requires very little current at the control terminal
D. it operates much faster
10.What logic function is produced by adding an inverter to each input and the output of an AND gate?
A. NAND
B. NOR
C. OR
D. NAND
11.When a transistor is cut off or saturated, transistor _____ have almost no effect
A. wave
B. variations
C. stage
D. wave
12.Express -7 as 16-bit signed binary numbers.
A. 0000 0000 0000 0111
B. 1000 0000 0000 0111
C. 0111 0000 0000 0001
D. 0000 0000 0000 0111
13.With an RS latch a high S and low R sets the output to _____ ; a low S and a high R _____ the output to low.
A. No change, set
B. Race, high
C. high, reset
D. No change, set
14.Flip-flop outputs are always
A. complimentary
B. the same
C. independent of each other
D. complimentary
15.The output 0 and 1 levels for TTL logic family is approximately
A. 0.1 and 5 V
B. 0.6 and 3.5 V
C. 0.9 and 1.75V
D. 0.1 and 5 V
16.A _____ TTL device can sink up to 16mA and can source up to 400 MA.
A. Low-power
B. high-power
C. Standard
D. Low-power
17.Digital design often starts by constructing a _____ table.
A. Standard
B. Two-stage
C. Truth
D. Standard
18.The hexadecimal digits are 0 to 9 and A to _____
A. E
B. F
C. G
D. E
19.The ASCII
A. is a subset of 8-bit EBCDIC
B. is used only in Western Countries
C. is version II of the ASC Standard
D. is a subset of 8-bit EBCDIC
20.An OR gate has 6 inputs. What is the only input word that produces a 0 output?
A. 0
B. 111
C. 111000
D. 0
21.A diagram that illustrates the ore (Logic) of functions in a program called a
A. Flowchart
B. Sequence of steps
C. Direction of flow
D. Flowchart
22.The Gray code for decimal 7 is
A. 111
B. 1011
C. 100
D. 111
23.The time required for a pulse to decrease from 90 to 10 percent of its maximum value is known as
A. rise time
B. decay time
C. binary level transition period
D. rise time
24.Conversion of binary number 1010000101112 to hexadecimal number is
A. D8F916
B. A8B916
C. A1716
D. D8F916
25._____dominates the LSI field, and _____ is used extensively where lowest power consumption is necessary.
A. NMOS, PMOS
B. PMOS, CMOS
C. NMOS, CMOS
D. NMOS, PMOS
26.Conversion of an octal number 1438 to its decimal number is
A. 9010
B. 97110
C. 9910
D. 9010
27.How many inputs signals can a gate have?
A. one
B. more than one
C. two only
D. one
28.A combinational logic circuit which is used when it is desired to send data from two or more source through a single transmission line is known as
A. encoder
B. decoder
C. multiplexer
D. encoder
29.Conversion of binary number 10010012 to hexadecimal is
A. 4016
B. 3916
C. 4916
D. 4016
30.Which logic family dissipates the minimum power?
A. DTL
B. TTL
C. ECL
D. DTL
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