# Practice Test: Question Set - 04

**1. Consider as RS flip-flops with both inputs set to 0. If a momentary '1' is applied at the input S, then the output**

- (A) Q will flip
from 0 to 1

- (B) Q will flip
from 0 to 1 and then back to 0

- (C) Q̅ will
flip from 0 to 1

- (D) Q̅ will
flip from 0 to 1 and then back to 0

**2. A half-adder adds _______ bits**

- (A) 2

- (B) 8

- (C) 10

- (D) 16

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

- (A) Low

- (B) High

- (C) Zero

- (D) None of the
above

**4. The functional capacity for LSI devices is**

- (A) 1 to 11
gates

- (B) 12 to 99
gates

- (C) 100 to
10,000 gates

- (D) More than
10,000 gates

**5. Conversion of decimal number 99**

_{10}to it's binary number equivalent is- (A) 1100011

_{2}

- (B) 100011

_{2}

- (C) 1110001

_{2}

- (D) 1111000

_{2}

**6. What logic function is obtained by adding an inverter to the output of an AND gate?**

- (A) OR

- (B) NAND

- (C) XOR

- (D) NOR

**7. Conversion of decimal number 61**

_{10}to it's binary number equivalent is- (A) 111101

_{2}

- (B) 111100

_{2}

- (C) 110011

_{2}

- (D) 001101

_{2}

**8. The main advantage of hexadecimal numbers is the case of conversion from hexadecimal to ________ and vice versa.**

- (A) Decimal

- (B) Binary

- (C) ASCE

- (D) BCD

**9. Conversion of decimal number 28**

_{10}to it's octal number equivalent is- (A) 32

_{8}

- (B) 40

_{8}

- (C) 34

_{8}

- (D) 36

_{8}

**10. BCD numbers are useful whenever _______ information is transferred into or out of a digital system.**

- (A) Decimal

- (B) Binary

- (C) ASCII

- (D) Hexadecimal

**11. Cyclic codes are used in**

- (A) Data
transfer

- (B) Continuously
varying signal representation

- (C) Arithmetic
and logical computation

- (D) None
of the above

**12. Instead of counting with binary numbers, a ring counter uses words that have a single high ________**

- (A) Bytes

- (B) Bit

- (C) Gate

- (D) Chip

**13. What is the 2's-complement representation of -24 in a 16-bit microcomputer?**

- (A) 0000 0000
0001 1000

- (B) 1111 1111
1110 0111

- (C) 1111 1111
1110 1000

- (D) 0001 0001
1111 0011

**14. Conversion of binary number 100011**

_{2}to an octal number is- (A) 43

_{8}

- (B) 47

_{8}

- (C) 49

_{8}

- (D) 50

_{8}

**15. With positive clocking the clock signal must be ________ for the flip-flop to respond.**

- (A) High

- (B) Low

- (C) Set

- (D) Race

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