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Home » GAT Subject » Computer Science » Aptitude Test - 38
1.The logic 1 in positive logic system is represented by:
A. zero voltage
B. lower voltage level
C. higher voltage level
D. zero voltage
2.The number of two-input NAND gates required to produce the two-input OR function is
A. 1
B. 2
C. 3
D. 1
3.Which of the following is not functionally a complete set?
A. AND, OR
B. NAND
C. NOR
D. AND, OR
4.The fan-out capability of a digital building block can be defined as
A. the number of inputs that one output can transmit to
B. the amount of cooling required for fanning the hear out
C. the number of inputs that can transmit to one input
D. the number of inputs that one output can transmit to
5.Conversion of an octal number 738 to binary number is
A. 1101112
B. 1111002
C. 1100102
D. 1101112
6.Conversion of binary number 11000012 to hexadecimal is
A. 5716
B. 6116
C. 5116
D. 5716
7.The main advantage of hexadecimal numbers is the case of conversion from hexadecimal to _____ and vice versa.
A. decimal
B. binary
C. ASCE
D. decimal
8.Which of the following TTL subfamily is the fastest
A. standard TTL
B. high-speed TTL
C. schottky TTL
D. standard TTL
9.The leading bit stands for the _____ and the remaining bits for the _____ is known as signed binary numbers.
A. sign, remainder
B. sign, magnitude
C. value, sign
D. sign, remainder
10.A multiplexer is also known as
A. coder
B. decoder
C. data selector
D. coder
11.Standard TTL has a multiple emitter input transistor and a _____ output
A. totem-pole
B. bipolar
C. register
D. totem-pole
12.A shift register moves the _____ left or right. Serial loading means storing a word in a shift register by entering _____ bit per clock pulse. With parallel or broadside loading, it takes only one _____ pulse to load the input word.
A. light, eight, clock
B. right, eight, clock
C. bits, one, register
D. light, eight, clock
13.A flip-flop can store:
A. 1 bits of data
B. 2 bits of data
C. 3 bits of data
D. 1 bits of data
14.A logic circuit which is used to change a BCD number into an equivalent decimal number is
A. decoder
B. encoder
C. multiplexer
D. decoder
15.Cyclic codes are used in
A. data transfer
B. continuously varying signal representation
C. arithmetic and logical computation
D. data transfer
16.The digits used in a binary number system are _____ and _____
A. 9 and 0
B. 0 and 1
C. 1 and 2
D. 9 and 0
17.The 2-input XOR gate has a high output only when the input bits are _____
A. even
B. different
C. low
D. even
18.Conversion of binary number 10010102 to to its decimal number is
A. 7410
B. 9710
C. 7210
D. 7410
19.A combinational logic circuit which generates particular binary word or number is
A. decoder
B. multiplexer
C. encoder
D. decoder
20.Conversion of binary number 1100002 to hexadecimal is
A. 3016
B. 4016
C. 4316
D. 3016
21.Conversion of an octal number 1068 to binary number is
A. 11100102
B. 10001102
C. 11001102
D. 11100102
22.Conversion of binary number 1000112 to an octal number is
A. 438
B. 478
C. 498
D. 438
23.What is the hexadecimal equivalent of a binary number 10101111
A. AF
B. 9E
C. 8C
D. AF
24.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.
A. SSI, MSI
B. MSI, LSI
C. SSI, LSI
D. SSI, MSI
25.Small-scale integration, abbreviated _____ refers to fewer than 12 gates on the same chip. Medium-scale integration (MSI) means 12 to 100 gates per chip. And large-scale integration (LSI) refers to more than _____ gates per chip.
A. SSI, 75
B. SSI, 100
C. SSI, 1000
D. SSI, 75
26.How many outputs signals can a gate have?
A. one
B. more than one
C. two only
D. one
27.Conversion of an octal number 1258 to its decimal number is
A. 9010
B. 8510
C. 8710
D. 9010
28.What is the main advantage of using MOSFET rather than bipolar transistor circuitary in ICs?
A. much greater complexity (more components) than bipolar circuits : better economy
B. higher operating speed than bipolar circuits
C. fewer power supply connections are required with MOS ICs
D. much greater complexity (more components) than bipolar circuits : better economy
29.The term sum-of-products in boolean algebra means
A. The AND function of several OR functions
B. The OR function of several AND functions
C. The OR function of several OR functions
D. The AND function of several OR functions
30.A shift register can be used for:
A. parallel to serial conversion
B. serial to parallel conversion
C. digital delay line
D. parallel to serial conversion
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