# Practice Test: Question Set - 01

**1. Which of the following Boolean algebra statements represent commutative law**

- (A) (A+B)+CA+(B+C)

- (B) A.(B+C)(A.B)+(A.C)

- (C) A+BB+A

- (D) A+AA

**2. A logic circuit which is used to change a BCD number into an equivalent decimal number is**

- (A) Decoder

- (B) Encoder

- (C) Multiplexer

- (D) Code
converter

**3. The 2's compliment of binary number 010111.1100 is**

- (A) 101001.1100

- (B) 101000.0100

- (C) 010111.0011

- (D) 101000.0011

**4. Conversion of an octal number 142**

_{8}to binary number is- (A) 1100010

_{2}

- (B) 110110

_{2}

- (C) 1100011

_{2}

- (D) 1101101

_{2}

**5. A combinational logic circuit which generates particular binary word or number is**

- (A) Decoder

- (B) Multiplexer

- (C) Encoder

- (D) De-multiplexer

**6. A byte is consist of ________ bits**

- (A) Two

- (B) Four

- (C) Eight

- (D) Ten

**7. Subtraction of 100101100**

_{2}from 1110101010_{2}is- (A) 1001011110

_{2}

- (B) 0110100001

_{2}

- (C) 1111000001

_{2}1111000001

_{2}

- (D) 1111011111

_{2}

**8. 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) ECL, DTL

**9. The NOR gate is logically equivalent to an OR gate followed by an ________**

- (A) AND

- (B) XAND

- (C) XOR

- (D) Inverter

**10. _______is an abbreviation for binary digit.**

- (A) 0 and 1

- (B) Base

- (C) Bit

- (D) None
of the above

**11. 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 AND functions

**12. How many full adders are required to construct an m- bit parallel adder?**

- (A) m/2

- (B) m-1

- (C) m

- (D) m+1

**13. The number of input words in a truth table always equals _______ where n is the number of inputs bits.**

- (A) 10

^{n}

- (B) 2

^{n}

- (C) 4

^{n}

- (D) 8

^{n}

**14. Conversion of binary number 10000000000**

_{2}to decimal number is- (A) 1024

_{10}

- (B) 1034

_{10}

- (C) 1124

_{10}

- (D) 1037

_{10}

**15. Conversion of hexadecimal number 6B2**

_{16}to it's binary number equivalent is- (A) 1111000110111

_{2}

- (B) 011010110010

_{2}

- (C) 0110011001111

_{2}

- (D) 11111111

_{2}

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