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Home » GAT Subject » Computer Science » Aptitude Test - 21
1.Convert 73116 to decimal:
A. 216.4
B. 985
C. 3D9
D. 216.4
2.Convert the following hexadecimal number to decimal. (B5)16 ?
A. 212
B. 197
C. 165
D. 212
3.Which of the following is the primary advantage of using the BCD code instead of straight binary coding?
A. Fewer bits are required to represent a decimal number with the BCD code.
B. The relative ease of converting to and from decimal.
C. BCD codes are easily converted to hexadecimal codes.
D. Fewer bits are required to represent a decimal number with the BCD code.
4.How many BCD code bits and how many straight binary bits would be required to represent the decimal number 643?
A. 12 BCD, 12 binary
B. 12 BCD, 10 binary
C. 12 BCD, 9 binary
D. 12 BCD, 12 binary
5.Hexadecimal letters A through F are used for decimal equivalent values from:
A. 1 through 6
B. 9 through 14
C. 10 through 15
D. 1 through 6
6.Convert the following decimal number to hexadecimal. 125:
A. 7D16
B. D716
C. 7C16
D. 7D16
7.The difference of 111 – 001 equals:
A. 100
B. 111
C. 001
D. 100
8.Even-parity 01101000 binary is ________in hexadecimal.
A. (C8)16
B. (68)16
C. (D0)16
D. (C8)16
9.In binary, the decimal number 93 converts to ________ digits.
A. seven
B. eight
C. 11
D. seven
10.The two's complement system is to be used to add the signed numbers 11110010 and 11110011. Determine, in decimal, the sign and value of each number and their sum:
A. –14 and –13; –27
B. –113 and –114; 227
C. –27 and –13; 40
D. –14 and –13; –27
11.The fast carry or look-ahead carry circuits found in most 4-bit parallel-adder circuits:
A. increase ripple delay
B. add a 1 to complemented inputs
C. reduce propagation delay
D. increase ripple delay
12.The selector inputs to an arithmetic-logic unit (ALU) determine the:
A. selection of the IC
B. arithmetic or logic function
C. data word selection
D. selection of the IC
13.Adding in binary, the decimal values 26 + 27 will produce a sum of:
A. 111010
B. 110110
C. 110101
D. 111010
14.In VHDL, the architecture declaration always begins with the ________ of variable signals or components that will be used in the concurrent description between BEGIN and END.?
A. type
B. vectors
C. functions
D. type
15.When decimal numbers with several digits are to be added together using BCD adders ________.?
A. a separated BCD adder is required for each digit position
B. the BCD adders must have the carry-outs grounded
C. the BCD's must be grouped in twos
D. a separated BCD adder is required for each digit position
16.The binary adder circuit is designed to add ________ binary number(s) at a time.?
A. 1
B. 3
C. 2
D. 1
17.The 74HC382 ALU can perform ________ operations.?
A. 2
B. 4
C. 8
D. 2
18.Subtraction of the 2's-complement system actually involves the operation of ________.?
A. subtraction
B. addition
C. multiplication
D. subtraction
19.FC48 – AB91 = ________.?
A. 5B77
B. 5267
C. 50B7
D. 5B77
20.In BCD addition, the value ________ is added to any invalid code group?
A. 0110
B. 100110
C. 0U812
D. 0110
21.In AHDL macrofunctions, the first thing that should go into any source file is ________ your code.?
A. a field of comments that documents
B. a library of
C. a function name of
D. a field of comments that documents
22.The binary addition of 1 + 1 = ________.?
A. sum = 1 carry = 1
B. sum = 0 carry = 0
C. sum = 1 carry = 0
D. sum = 1 carry = 1
23.A 74HC283 can be used to implement a(n) ________ adder?
A. 4-bit BCD
B. 8-bit BCD
C. 4-bit full
D. 4-bit BCD
24.The two's complement of 00001111 is ________.?
A. 11110001
B. 11111111
C. 11110000
D. 11110001
25.If [A] = 10 and [B] = 01, then [A] [b] = ________.?
A. [00]
B. 00
C. 11
D. [00]
26.Binary numbers can be added together in a basic parallel-adder circuit when ________.?
A. negative numbers are in 2's-complement form
B. negative numbers are in 1's-complement form
C. all carry pins are grounded
D. negative numbers are in 2's-complement form
27.Packages are used to contain ________ and other information that must be available to all entities in the design file.?
A. types
B. vectors
C. components
D. types
28.34FC + AD31 = ________.?
A. E31D
B. E22D
C. E21D
D. E31D
29.Solve this binary problem: 1001 × 1100 = ________.?
A. 01110001
B. 01111000
C. 01101110
D. 01110001
30.The contents of the A register after is ________.?
A. 0000
B. 1010
C. 0001
D. 0000
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