BPSC Tre 4.0 Digtial Electronics Quiz Practice Set 1 30th October 2026 Share On Que: (1). Digital circuit can be made by the repeated use of the _________. Asked in BPSC TRE 3.0 NOR gate B. AND gate C. NAND gate A. More than one of the above D. None of the above E. Check Answer Open question page Que: (2). Which of the following gates is known as a Universal Gate? NAND gate C. OR gate B. AND gate A. XOR gate D. None of the above E. Check Answer Open question page Que: (3). Which of the following logic gates produces an output of 1 only when all its inputs are 1? NOR gate C. OR gate A. AND gate B. XOR gate D. None of the above E. Check Answer Open question page Que: (4). Which logic gate gives an output of 1 when at least one input is 1? OR gate C. NOT gate B. AND gate A. XNOR gate D. None of the above E. Check Answer Open question page Que: (5). Which logic gate is also known as an inverter? AND gate A. XOR gate C. OR gate B. NOT gate D. NAND gate E. Check Answer Open question page Que: (6). What is the output of an XOR gate when both inputs are the same? 0 A. Undefined C. 1 B. More than one of the above D. None of the above E. Check Answer Open question page Que: (7). What is the Boolean expression of a NAND gate? A + B B. A · B A. (A · B)' C. (A + B)' D. None of the above E. Check Answer Open question page Que: (8). According to De Morgan's first theorem, (A + B)' is equal to: A · B C. A' + B' A. A' · B' B. A + B D. None of the above E. Check Answer Open question page Que: (9). How many select lines are required for a 16-to-1 multiplexer? 3 B. 4 C. 2 A. 5 D. None of the above E. Check Answer Open question page Que: (10). Which flip-flop is commonly used as a basic memory element in sequential circuits? AND gate A. OR gate B. NOT gate C. SR flip-flop D. XOR gate E. Check Answer Open question page Que: (11). Which of the following is correct for Digital Circuits? Asked in BPSC TRE 3.0 They process information using continuous voltage levels B. They are not suitable for high speed operations C. They use analog signals for communication A. More than one of the above D. None of the above E. Check Answer Open question page Que: (12). Which number system is predominantly used in digital electronic circuits? Octal C. Binary B. Decimal A. Hexadecimal D. None of the above E. Check Answer Open question page Que: (13). How many bits are required to represent one hexadecimal digit? 2 bits A. 3 bits B. 4 bits C. 8 bits D. None of the above E. Check Answer Open question page Que: (14). What is the decimal equivalent of the binary number 1011? 11 C. 9 A. 10 B. 12 D. None of the above E. Check Answer Open question page Que: (15). Which of the following is the main advantage of digital circuits over analog circuits? No requirement of power supply C. Higher noise immunity A. Unlimited continuous signal values B. Complete absence of errors D. None of the above E. Check Answer Open question page Que: (16). What does logic HIGH represent in a positive logic digital system? Binary 1 B. Both 0 and 1 C. Binary 0 A. Neither 0 nor 1 D. None of the above E. Check Answer Open question page Que: (17). Which of the following is an example of a combinational logic circuit? Register B. Multiplexer C. Counter A. Flip-flop D. None of the above E. Check Answer Open question page Que: (18). Which type of circuit has memory and depends on both present inputs and previous states? Sequential circuit B. Combinational circuit A. Analog circuit C. Linear circuit D. None of the above E. Check Answer Open question page Que: (19). What is the smallest unit of information in a digital system? Bit C. Byte A. Nibble B. Word D. None of the above E. Check Answer Open question page Que: (20). Which of the following devices converts an analog signal into a digital signal? Multiplexer C. ADC B. DAC A. Demultiplexer D. None of the above E. Check Answer Open question page Que: (21). Which of the following is an example of a digital Electronic? Asked in BPSC TRE 3.0 Digital cameras C. Mobile phones B. Computers A. More than one of the above D. None of the above E. Check Answer Open question page Que: (22). Which of the following is commonly used as a semiconductor material in digital electronic devices? Copper A. Silicon B. Aluminium C. Iron D. None of the above E. Check Answer Open question page Que: (23). Which electronic component is used as the basic building block of modern integrated circuits? Transistor C. Capacitor B. Resistor A. Inductor D. None of the above E. Check Answer Open question page Que: (24). What is the full form of IC in digital electronics? Internal Circuit A. Internet Connection C. Integrated Circuit B. Intelligent Component D. None of the above E. Check Answer Open question page Que: (25). Which device is primarily responsible for executing instructions in a computer? Monitor A. Keyboard B. CPU C. Printer D. None of the above E. Check Answer Open question page Que: (26). Which memory is commonly used to store firmware in digital electronic devices? ROM B. Cache C. RAM A. Register D. None of the above E. Check Answer Open question page Que: (27). Which of the following is an example of a non-volatile memory? DRAM B. ROM C. SRAM A. Cache memory D. None of the above E. Check Answer Open question page Que: (28). Which technology is commonly used to manufacture modern microprocessors? Vacuum tube technology A. Mechanical technology C. VLSI technology B. Hydraulic technology D. None of the above E. Check Answer Open question page Que: (29). Which of the following is an example of an embedded digital system? Traditional typewriter C. Washing machine controller A. General-purpose desktop computer B. Mechanical wall clock D. None of the above E. Check Answer Open question page Que: (30). Which of the following is a major application of digital electronics in communication systems? Only mechanical signal transmission B. Only hydraulic transmission C. Digital data transmission A. Only manual communication D. None of the above E. Check Answer Open question page Que: (31). An OR gate has 4 inputs. The number of words in truth table will be _______. Asked in BPSC TRE 3.0 8 B. 16 C. 4 A. More than one of the above D. None of the above E. Check Answer Open question page Que: (32). A digital circuit has 5 input variables. How many possible input combinations are there? 25 B. 16 A. 32 C. 64 D. None of the above E. Check Answer Open question page Que: (33). How many rows are present in the truth table of a 3-input AND gate? 4 A. 8 C. 6 B. 16 D. None of the above E. Check Answer Open question page Que: (34). How many different Boolean functions can be defined using 2 input variables? 4 A. 8 B. 16 C. 32 D. None of the above E. Check Answer Open question page Que: (35). What is the maximum number of minterms for a Boolean function having 4 variables? 8 B. 4 A. 16 C. 32 D. None of the above E. Check Answer Open question page Que: (36). Which Boolean algebra law states that A + 0 = A? Identity law B. Commutative law C. Complement law A. Distributive law D. None of the above E. Check Answer Open question page Que: (37). According to the idempotent law of Boolean algebra, what is the value of A + A? A C. 0 A. 1 B. A' D. None of the above E. Check Answer Open question page Que: (38). What is the output of a 2-input NOR gate when both inputs are LOW? Undefined C. 1 B. 0 A. High impedance D. None of the above E. Check Answer Open question page Que: (39). How many possible output combinations can be represented by 3 output bits? 6 B. 3 A. 8 C. 16 D. None of the above E. Check Answer Open question page Que: (40). Which of the following represents the complement of the Boolean expression A · 1? A A. A' B. 1 C. None of the above E. Check Answer Open question page Que: (41). When does a negative level triggered flip-flop in Digital Electronics changes its state? Asked in BPSC TRE 3.0 When the inputs are all zero C. When the clock is Positive B. When the clock is Negative A. More than one of the above D. None of the above E. Check Answer Open question page Que: (42). What is the main characteristic of an edge-triggered flip-flop? It responds continuously to input changes A. It does not require a clock signal C. It changes state only at a specified clock edge B. It stores multiple bytes D. None of the above E. Check Answer Open question page Que: (43). What is the name of the transition of a clock signal from LOW to HIGH? Negative edge B. Rising edge C. Falling edge A. Trailing edge D. None of the above E. Check Answer Open question page Que: (44). Which flip-flop has no invalid input condition in its basic operation? D flip-flop C. SR flip-flop A. JK flip-flop B. Both B and C D. None of the above E. Check Answer Open question page Que: (45). What happens when both J and K inputs are HIGH in a JK flip-flop? Output toggles C. Output becomes permanently 0 A. Output becomes permanently 1 B. Output remains unchanged D. None of the above E. Check Answer Open question page Que: (46). Which flip-flop is commonly used in shift registers? D flip-flop A. JK flip-flop only C. SR flip-flop B. T flip-flop only D. None of the above E. Check Answer Open question page Que: (47). What is the primary function of a T flip-flop? Analog signal amplification C. Data storage only A. Frequency division and toggling B. Voltage regulation D. None of the above E. Check Answer Open question page Que: (48). How many flip-flops are required to construct a MOD-16 binary counter? 2 A. 3 B. 4 C. 16 D. None of the above E. Check Answer Open question page Que: (49). What is the main difference between a latch and a flip-flop? Both are purely combinational circuits C. Latch is edge-triggered and flip-flop is level-triggered A. Latch is level-sensitive and flip-flop is generally edge-triggered B. Latch cannot store binary data D. None of the above E. Check Answer Open question page Que: (50). What is the race-around condition in a JK flip-flop? When J and K are both HIGH and the clock pulse is too wide B. When J and K are both LOW A. When the clock is disconnected C. When the output is permanently HIGH D. None of the above E. Check Answer Open question page Que: (51). What is the result of the operation 1010 AND 1100 in binary? Asked in BPSC TRE 3.0 1110 B. 100 C. 1000 A. More than one of the above D. None of the above E. Check Answer Open question page Que: (52). What is the result of the binary OR operation 1010 OR 1100? 1000 A. 1010 C. 1110 B. 1100 D. None of the above E. Check Answer Open question page Que: (53). What is the result of the binary XOR operation 1010 XOR 1100? 0110 C. 1000 A. 1110 B. 0010 D. None of the above E. Check Answer Open question page Que: (54). What is the 1's complement of the binary number 101100? 010100 C. 010011 A. 101011 B. 110011 D. None of the above E. Check Answer Open question page Que: (55). What is the 2's complement of the binary number 0101? 1100 C. 1011 B. 1010 A. 1110 D. None of the above E. Check Answer Open question page Que: (56). What is the decimal equivalent of the binary number 11010? 25 B. 26 C. 24 A. 28 D. None of the above E. Check Answer Open question page Que: (57). What is the binary equivalent of decimal number 25? 11100 C. 11001 A. 10101 B. 10011 D. None of the above E. Check Answer Open question page Que: (58). What is the result of the binary addition 1011 + 0101? 10100 C. 10000 B. 1110 A. 11000 D. None of the above E. Check Answer Open question page Que: (59). What is the result of the binary subtraction 1101 - 0101? 0110 C. 1010 B. 1000 A. 1110 D. None of the above E. Check Answer Open question page Que: (60). What is the result of left shifting the binary number 0011 by 2 positions? 0011 A. 1100 C. 0110 B. 11000 D. None of the above E. Check Answer Open question page Que: (61). In a half-adder circuit, what are the outputs? Asked in BPSC TRE 3.0 Sum and Difference C. Sum and Carry A. Difference and Borrow B. More than one of the above D. None of the above E. Check Answer Open question page Que: (62). Which logic gate is used to generate the Sum output of a half-adder? AND gate A. OR gate B. XOR gate C. NOR gate D. None of the above E. Check Answer Open question page Que: (63). Which logic gate is used to generate the Carry output of a half-adder? AND gate B. XOR gate A. NOT gate C. NAND gate D. None of the above E. Check Answer Open question page Que: (64). How many input bits are used in a half-adder circuit? Three C. One A. Two B. Four D. None of the above E. Check Answer Open question page Que: (65). How many input bits are used in a full-adder circuit? Two B. One A. Three C. Four D. None of the above E. Check Answer Open question page Que: (66). Which of the following are the outputs of a full-adder circuit? Difference and Borrow B. Sum and Carry A. Input and Output C. More than one of the above D. None of the above E. Check Answer Open question page Que: (67). Which of the following is a limitation of a half-adder circuit? It cannot generate Sum A. It cannot generate Carry B. It cannot accept a Carry-in input C. It requires three input bits D. None of the above E. Check Answer Open question page Que: (68). A full-adder circuit can be constructed using which combination of logic circuits? Two half-adders and one AND gate B. Two half-adders and one OR gate A. One half-adder and one NOT gate C. Two OR gates and one NOT gate D. None of the above E. Check Answer Open question page Que: (69). What are the outputs of a half-subtractor circuit? Difference and Borrow B. Sum and Carry A. Sum and Borrow C. Carry and Difference D. None of the above E. Check Answer Open question page Que: (70). Which Boolean expression represents the Borrow output of a half-subtractor? A XOR B B. A' AND B C. A AND B A. A OR B D. None of the above E. Check Answer Open question page Que: (71). Which of the following is the type of Read Only Memory (ROM)? Asked in BPSC TRE 3.0 EPROM B. MROM C. PROM A. More than one of the above D. None of the above E. Check Answer Open question page Que: (72). Which type of ROM can be programmed by the user only once? EPROM A. EEPROM C. PROM B. Flash ROM D. None of the above E. Check Answer Open question page Que: (73). Which type of ROM is erased using ultraviolet light? PROM A. MROM B. EPROM C. EEPROM D. None of the above E. Check Answer Open question page Que: (74). Which type of ROM can be electrically erased and reprogrammed? MROM B. PROM A. EPROM C. EEPROM D. None of the above E. Check Answer Open question page Que: (75). Which type of memory is programmed by the manufacturer during the manufacturing process? PROM A. EPROM B. MROM C. EEPROM D. None of the above E. Check Answer Open question page Que: (76). Which of the following is a non-volatile memory? SRAM A. ROM C. DRAM B. Cache memory D. None of the above E. Check Answer Open question page Que: (77). Which memory is commonly used to store the firmware of a computer system? ROM B. Cache C. RAM A. Register D. None of the above E. Check Answer Open question page Que: (78). What is the main characteristic of Flash Memory? It can be electrically erased and reprogrammed B. It can only be programmed once C. It is volatile memory A. It requires continuous power to retain data D. None of the above E. Check Answer Open question page Que: (79). Which type of ROM allows erasing and rewriting data without removing the chip from the circuit? EEPROM C. PROM B. MROM A. Mask ROM D. None of the above E. Check Answer Open question page Que: (80). Which of the following statements about ROM is correct? Traditional ROM retains data without power C. ROM is generally non-volatile A. ROM is used to store firmware B. More than one of the above D. None of the above E. Check Answer Open question page Que: (81). What is a PLA? Asked in BPSC TRE 3.0 Programmable Logic Architecture C. Programmable Logic Application A. Programmable Logic Array B. More than one of the above D. None of the above E. Check Answer Open question page Que: (82). Which two arrays are programmable in a PLA? OR array and XOR array C. AND array and OR array A. AND array and NOT array B. NAND array and NOR array D. None of the above E. Check Answer Open question page Que: (83). What is the full form of PAL in digital electronics? Programmable Array Logic A. Parallel Array Logic C. Programmed Arithmetic Logic B. Programmable Application Logic D. None of the above E. Check Answer Open question page Que: (84). Which array is fixed in a standard PAL device? AND array A. Both AND and OR arrays C. OR array B. Neither AND nor OR array D. None of the above E. Check Answer Open question page Que: (85). Which programmable logic device has a fixed AND array and a programmable OR array? PLA A. PAL B. PROM C. Multiplexer D. None of the above E. Check Answer Open question page Que: (86). Which programmable logic device provides greater flexibility by allowing both AND and OR arrays to be programmed? Fixed ROM C. PLA B. PAL A. Encoder D. None of the above E. Check Answer Open question page Que: (87). What type of logic functions are commonly implemented using PLA? Combinational logic functions A. Only sequential logic functions C. Only arithmetic functions B. Only memory storage functions D. None of the above E. Check Answer Open question page Que: (88). Which of the following correctly compares PLA and PAL? PLA has a fixed AND array, while PAL has both programmable arrays B. Both PLA and PAL have fixed AND and OR arrays C. PLA has both programmable arrays, while PAL has a programmable AND array and fixed OR array A. PLA has a programmable OR array only, while PAL has a programmable AND array only D. None of the above E. Check Answer Open question page Que: (89). What is the primary purpose of a programmable logic device (PLD)? To implement digital logic functions A. To convert analog signals into sound C. To increase the physical size of a circuit B. To store only multimedia files D. None of the above E. Check Answer Open question page Que: (90). Which of the following is an example of a programmable logic device? CPLD C. PAL B. PLA A. More than one of the above D. None of the above E. Check Answer Open question page Que: (91). How many select lines are required for an 8-to-1 multiplexer? Asked in BPSC TRE 3.0 3 B. 2 A. 4 C. More than one of the above D. None of the above E. Check Answer Open question page Que: (92). How many input lines are present in a 4-to-1 multiplexer? 2 A. 8 C. 4 B. 16 D. None of the above E. Check Answer Open question page Que: (93). How many select lines are required for a 16-to-1 multiplexer? 2 A. 3 B. 4 C. 5 D. None of the above E. Check Answer Open question page Que: (94). What is the main function of a multiplexer? Many inputs to one output B. Converts digital signals into analog signals C. One input to many outputs A. Stores binary data permanently D. None of the above E. Check Answer Open question page Que: (95). How many output lines are present in a 1-to-8 demultiplexer? 1 A. 4 C. 2 B. 8 D. None of the above E. Check Answer Open question page Que: (96). How many select lines are required for a 1-to-16 demultiplexer? 4 C. 3 B. 2 A. 5 D. None of the above E. Check Answer Open question page Que: (97). Which digital circuit performs the reverse operation of a multiplexer? Demultiplexer C. Decoder B. Encoder A. Comparator D. None of the above E. Check Answer Open question page Que: (98). How many select lines are required for a 32-to-1 multiplexer? 3 A. 5 C. 4 B. 6 D. None of the above E. Check Answer Open question page Que: (99). A multiplexer is classified as which type of digital circuit? Sequential circuit B. Memory circuit C. Combinational circuit A. Clocked storage circuit D. None of the above E. Check Answer Open question page Que: (100). How many select lines are required for a 64-to-1 multiplexer? 5 B. 4 A. 6 C. 7 D. None of the above E. Check Answer Open question page Que: (101). Convert the decimal number 1234 to binary, octal, and hexadecimal. Which of the following options correctly represents these conversions? Asked in BPSC TRE 3.0 Binary: 11001110010, Octal: 1712, Hexadecimal: 72A B. Binary: 11100110010, Octal: 1642, Hexadecimal: 3CD C. Binary: 10011010010, Octal: 2322, Hexadecimal: 4D2 A. More than one of the above D. None of the above E. Check Answer Open question page Que: (102). Convert the decimal number 45 into binary, octal and hexadecimal. Binary: 101101, Octal: 55, Hexadecimal: 2D A. Binary: 110101, Octal: 65, Hexadecimal: 3D C. Binary: 101011, Octal: 54, Hexadecimal: 2C B. Binary: 111101, Octal: 57, Hexadecimal: 2F D. None of the above E. Check Answer Open question page Que: (103). What is the hexadecimal equivalent of the decimal number 255? EF A. FF C. FE B. F0 D. None of the above E. Check Answer Open question page Que: (104). What is the decimal equivalent of the binary number 101101? 45 C. 44 B. 43 A. 46 D. None of the above E. Check Answer Open question page Que: (105). What is the decimal equivalent of the octal number 157? 111 C. 107 A. 109 B. 117 D. None of the above E. Check Answer Open question page Que: (106). What is the decimal equivalent of the hexadecimal number 2A? 42 C. 40 A. 41 B. 43 D. None of the above E. Check Answer Open question page Que: (107). Convert the binary number 11010110 into hexadecimal. C6 A. E6 C. D6 B. D5 D. None of the above E. Check Answer Open question page Que: (108). Convert the octal number 725 into binary. 110010101 B. 111010101 A. 111100101 C. 101010111 D. None of the above E. Check Answer Open question page Que: (109). What is the binary equivalent of the hexadecimal number 3F? 00111110 A. 00110111 C. 00111111 B. 00111101 D. None of the above E. Check Answer Open question page Que: (110). What is the octal equivalent of the binary number 1101011? 152 B. 153 C. 151 A. 157 D. None of the above E. Check Answer Open question page Que: (111). What is Booth’s algorithm used for? Asked in BPSC TRE 3.0 Binary multiplication C. Decimal to binary conversion B. Binary to decimal conversion A. More than one of the above D. None of the above E. Check Answer Open question page Que: (112). Which number representation is commonly used by Booth’s algorithm for signed binary multiplication? 2’s complement representation C. 1’s complement representation B. Sign-magnitude representation A. BCD representation D. None of the above E. Check Answer Open question page Que: (113). Which register stores the multiplier in the standard Booth’s multiplication algorithm? Accumulator (A) A. Multiplicand register (M) C. Multiplier register (Q) B. Sequence counter (SC) D. None of the above E. Check Answer Open question page Que: (114). In Booth’s algorithm, what operation is performed when the bit pair (Q₀, Q₋₁) is 01? Perform no arithmetic operation C. Add multiplicand to accumulator A. Subtract multiplicand from accumulator B. Complement the accumulator D. None of the above E. Check Answer Open question page Que: (115). In Booth’s algorithm, what operation is performed when the bit pair (Q₀, Q₋₁) is 10? Subtract multiplicand from accumulator B. Add multiplicand to accumulator A. Perform no arithmetic operation C. Clear the accumulator D. None of the above E. Check Answer Open question page Que: (116). What operation is performed when the bit pair (Q₀, Q₋₁) is 00 in Booth’s algorithm? Add multiplicand A. Subtract multiplicand B. No addition or subtraction C. Complement multiplier D. None of the above E. Check Answer Open question page Que: (117). Which type of shift is performed in each iteration of the standard Booth’s algorithm? Arithmetic right shift C. Logical right shift B. Logical left shift A. Circular left shift D. None of the above E. Check Answer Open question page Que: (118). How many iterations are generally required by Booth’s algorithm to multiply two n-bit binary numbers? 2n iterations B. n iterations A. n² iterations C. 2ⁿ iterations D. None of the above E. Check Answer Open question page Que: (119). What is the 2’s complement representation of -5 using 8 bits? 11111011 C. 00000101 A. 11111010 B. 10000101 D. None of the above E. Check Answer Open question page Que: (120). What is the result of multiplying binary numbers 101 and 11? 1011 C. 1000 B. 1111 A. 1101 D. None of the above E. Check Answer Open question page Que: (121). Which of the following is error detection code used in digital logic? Asked in BPSC TRE 3.0 Cyclic redundancy check (CRC) B. Hamming code A. Checksum C. More than one of the above D. None of the above E. Check Answer Open question page Que: (122). What is the primary purpose of a parity bit? To detect errors in transmitted data B. To compress data A. To encrypt data C. To increase transmission speed D. None of the above E. Check Answer Open question page Que: (123). In even parity, what should be the total number of 1s including the parity bit? Always even B. Always odd A. Always zero C. Always one D. None of the above E. Check Answer Open question page Que: (124). In odd parity, what should be the total number of 1s including the parity bit? Always odd B. Always even A. Always zero C. Always two D. None of the above E. Check Answer Open question page Que: (125). Which error detection technique uses polynomial division? Cyclic Redundancy Check (CRC) C. Checksum B. Parity checking A. Hamming distance D. None of the above E. Check Answer Open question page Que: (126). Which code is commonly used for both error detection and single-bit error correction? Hamming code B. BCD C. ASCII A. Gray code D. None of the above E. Check Answer Open question page Que: (127). How many parity bits are required for a standard Hamming code with 4 data bits? 1 A. 3 C. 2 B. 4 D. None of the above E. Check Answer Open question page Que: (128). What is the minimum Hamming distance required to detect up to 2-bit errors? 4 C. 3 B. 2 A. 5 D. None of the above E. Check Answer Open question page Que: (129). Which of the following statements about checksum is correct? It is commonly calculated using data units B. It is used to detect errors in data A. The receiver can recalculate and compare the checksum C. More than one of the above D. None of the above E. Check Answer Open question page Que: (130). What is the Hamming distance between the binary strings 10101 and 11100? 1 A. 2 B. 3 C. 4 D. None of the above E. Check Answer Open question page Que: (131). When performing BCD addition, what is the maximum value that can be represented in a single BCD digit? Asked in BPSC TRE 3.0 2 A. 10 B. 15 C. More than one of the above D. None of the above E. Check Answer Open question page Que: (132). How many bits are required to represent one decimal digit in standard BCD? 4 C. 2 A. 3 B. 8 D. None of the above E. Check Answer Open question page Que: (133). Which of the following is an invalid 8421 BCD code? 0101 A. 1010 C. 1001 B. 0011 D. None of the above E. Check Answer Open question page Que: (134). What is the BCD representation of decimal number 25? 11001 A. 0001 1001 C. 0010 0101 B. 0101 0010 D. None of the above E. Check Answer Open question page Que: (135). What correction value is added in BCD addition when the binary sum exceeds 1001 or generates a carry? 0110 C. 0011 A. 0101 B. 1000 D. None of the above E. Check Answer Open question page Que: (136). What is the BCD result of adding decimal 7 and decimal 5? 0000 1100 B. 0001 0001 C. 0001 0010 A. 0010 0000 D. None of the above E. Check Answer Open question page Que: (137). Which of the following decimal numbers has the BCD representation 1001 0010? 82 B. 92 C. 29 A. 90 D. None of the above E. Check Answer Open question page Que: (138). How many invalid combinations are present in a 4-bit 8421 BCD code? 6 C. 5 B. 4 A. 8 D. None of the above E. Check Answer Open question page Que: (139). Which number system is used in the standard 8421 BCD code? Weighted binary representation B. Gray code representation C. Pure binary representation A. Excess-3 representation D. None of the above E. Check Answer Open question page Que: (140). What is the BCD representation of decimal number 59? 111011 A. 0011 1011 C. 0101 1001 B. 1001 0101 D. None of the above E. Check Answer Open question page Que: (141). Convert the binary number 1011.1101 to itsdecimal equivalent. Which of the following isthe correct decimal value? Asked in BPSC TRE 3.0 12.125 B. 13.5 C. 11.75 A. More than one of the above D. None of the above E. Check Answer Open question page Que: (142). Convert the binary number 0.1011 into its decimal equivalent. 0.625 A. 0.6875 B. 0.75 C. More than one of the above D. None of the above E. Check Answer Open question page Que: (143). What is the decimal equivalent of the binary number 110.101? 6.5 B. 6.625 C. 6.25 A. 7.625 D. None of the above E. Check Answer Open question page Que: (144). Convert the decimal number 10.625 into binary. 1010.011 B. 1010.101 A. 1011.101 C. 1100.101 D. None of the above E. Check Answer Open question page Que: (145). What is the decimal equivalent of the binary number 101.011? 5.125 A. 5.25 B. 5.375 C. 5.5 D. None of the above E. Check Answer Open question page Que: (146). Convert the decimal number 13.3125 into its binary equivalent. 1101.0101 B. 1101.0011 A. 1011.0101 C. 1110.0101 D. None of the above E. Check Answer Open question page Que: (147). Find the decimal equivalent of the binary fraction 0.01101. 0.375 A. 0.4375 C. 0.40625 B. 0.5 D. None of the above E. Check Answer Open question page Que: (148). What is the decimal value of the binary number 111.0011? 7.1875 B. 7.25 C. 7.125 A. 7.375 D. None of the above E. Check Answer Open question page Que: (149). What is the binary representation of the decimal fraction 0.375? 0.011 B. 0.101 A. 0.110 C. 0.111 D. None of the above E. Check Answer Open question page Que: (150). Convert the binary number 1001.1001 into its decimal equivalent. 9.5 B. 9.5625 C. 9.25 A. 9.625 D. None of the above E. Check Answer Open question page Que: (151). What is De Morgan’s theorem used for indigital logic? Asked in BPSC TRE 3.0 Performing binary addition C. Simplifying Boolean expressions A. Implementing NAND gates B. More than one of the above D. None of the above E. Check Answer Open question page Que: (152). According to De Morgan’s theorem, what is the complement of A + B? A · B C. A' + B' A. A' · B' B. A + B D. None of the above E. Check Answer Open question page Que: (153). Which Boolean expression is equivalent to (A · B)'? A + B C. A' · B' B. A' + B' A. A · B D. None of the above E. Check Answer Open question page Que: (154). Which gate is equivalent to an OR gate followed by a NOT gate? NAND gate B. NOR gate C. AND gate A. XOR gate D. None of the above E. Check Answer Open question page Que: (155). Which gate is equivalent to an AND gate followed by a NOT gate? NAND gate A. OR gate C. NOR gate B. XOR gate D. None of the above E. Check Answer Open question page Que: (156). Using De Morgan’s theorem, simplify the expression ((A + B)')'. A · B B. A + B C. A' + B' A. A' · B' D. None of the above E. Check Answer Open question page Que: (157). Which Boolean expression represents a NAND gate with inputs A and B? (A + B)' C. A + B A. (A · B)' B. A · B D. None of the above E. Check Answer Open question page Que: (158). Which Boolean expression represents a NOR gate with inputs A and B? A + B C. (A · B)' B. A · B A. (A + B)' D. None of the above E. Check Answer Open question page Que: (159). How many inputs are required to apply De Morgan’s theorem to a Boolean expression? Exactly three inputs B. Exactly two inputs A. Only one input C. Any number of inputs D. None of the above E. Check Answer Open question page Que: (160). Which Boolean law states that the complement of a complemented variable is the original variable? Double complement law C. Commutative law A. Associative law B. Distributive law D. None of the above E. Check Answer Open question page Que: (161). What is the purpose of the “don’t care”condition in digital logic? Asked in BPSC TRE 3.0 To indicate that the value of a variable does not affect the output A. To prioritize certain inputs over others B. To ensure that all possible input combinations are covered in truth tables C. More than one of the above D. None of the above E. Check Answer Open question page Que: (162). Which symbol is commonly used to represent a don’t-care condition in a Karnaugh map? 0 A. X C. 1 B. Z D. None of the above E. Check Answer Open question page Que: (163). How can a don’t-care condition be treated during Boolean expression simplification? Only as 0 A. Only as 1 B. As either 0 or 1 C. It must always be ignored D. None of the above E. Check Answer Open question page Que: (164). What is the main advantage of using don’t-care conditions in Karnaugh maps? Simplifying Boolean expressions B. Reducing the number of input variables A. Increasing the number of logic gates C. Increasing the number of truth table rows D. None of the above E. Check Answer Open question page Que: (165). When should a don’t-care condition be used as 1 in a Karnaugh map? When it creates isolated 0s C. When it increases the number of variables B. When it helps form larger groups of 1s A. It must always be treated as 1 D. None of the above E. Check Answer Open question page Que: (166). In a digital circuit, unused input combinations are commonly represented as which type of conditions? Don’t-care conditions B. Carry conditions C. Parity conditions A. Overflow conditions D. None of the above E. Check Answer Open question page Que: (167). Is it necessary to use every don’t-care cell while simplifying a Karnaugh map? Only corner cells must be used C. Yes, every cell must be used A. No, only useful don’t-care cells need to be used B. Only cells containing 0 must be used D. None of the above E. Check Answer Open question page Que: (168). For Product of Sums (POS) simplification, how can a don’t-care cell be used? It cannot be used in POS simplification C. As 1 to form larger groups of 1s A. As 0 to form larger groups of 0s B. It must always be ignored D. None of the above E. Check Answer Open question page Que: (169). Which of the following statements about don’t-care conditions is correct? They always represent a fixed output of 1 B. They can be assigned either 0 or 1 for simplification C. They always represent a fixed output of 0 A. They are used only in binary addition D. None of the above E. Check Answer Open question page Que: (170). Which of the following can be reduced by effectively using don’t-care conditions? Number of logic gates A. Hardware implementation cost C. Complexity of Boolean expressions B. More than one of the above D. None of the above E. Check Answer Open question page
