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MCQOPTIONS
This section includes 1271 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics & Communication Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 401. |
A number given in binary as 0101.01 is to be scaled up 4 times. The scaled up binary is |
| A. | 10101 |
| B. | 1.0101 |
| C. | 404.04 |
| D. | 10.101 |
| Answer» B. 1.0101 | |
| 402. |
How many different BCD number can be stored in a register containing 12 switches using an 8, 4, 2, 1 code? |
| A. | 99 |
| B. | 100 |
| C. | 999 |
| D. | 1000 |
| Answer» E. | |
| 403. |
In a RS flip-flop no change occurs during |
| A. | prohibited mode |
| B. | set mode |
| C. | reset mode |
| D. | disable mode |
| Answer» E. | |
| 404. |
A mod 4 counter will count |
| A. | from 0 to 4 |
| B. | from 0 to 3 |
| C. | from any number n to n + 4 |
| D. | none of the above |
| Answer» C. from any number n to n + 4 | |
| 405. |
A digital system is required to amplify a binary encoded audio signal. The user should be able to control the gain of the amplifier from a minimum to a maximum in 100 increments. The minimum number of bits required to encode, in straight binary is, |
| A. | 8 |
| B. | 6 |
| C. | 5 |
| D. | 7 |
| Answer» E. | |
| 406. |
A flip-flop circuit is |
| A. | monostable |
| B. | bistable |
| C. | multistable |
| D. | unstable |
| Answer» C. multistable | |
| 407. |
Assertion (A): In computers the data is stored in hexadecimal formReason (R): Hexadecimal representation is short as compared to binary representation. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is true, R is false |
| D. | A is false, R is true |
| Answer» E. | |
| 408. |
Assuming accumulator contain A 64 and the carry is set (1). What will register A and (CY) contain after SBI 0B7H? |
| A. | 12 H, 0 |
| B. | 12 H, 1 |
| C. | DDH, 0 |
| D. | DDH, 1 |
| Answer» E. | |
| 409. |
What is the memory word size of 8085 μp? |
| A. | 6 bits |
| B. | 8 bits |
| C. | 12 bits |
| D. | 16 bits |
| Answer» C. 12 bits | |
| 410. |
Computer ICs work reliably because |
| A. | they are based on two state design |
| B. | these are made from pure silicon |
| C. | these are maintained at two temperatures |
| D. | none of the above |
| Answer» B. these are made from pure silicon | |
| 411. |
In floating point representation the number of bits in exponent is |
| A. | 8 |
| B. | 7 |
| C. | 6 |
| D. | 5 |
| Answer» D. 5 | |
| 412. |
In a 7 segment display the segments a, c, d, f, g are lit. The decimal number displayed will be |
| A. | 9 |
| B. | 5 |
| C. | 4 |
| D. | 2 |
| Answer» C. 4 | |
| 413. |
T-flip-flop is commonly used as |
| A. | a delay switch |
| B. | a digital counter only |
| C. | a digital counter and frequency divider |
| D. | any of the above |
| Answer» D. any of the above | |
| 414. |
Bit is |
| A. | smallest piece of electronic hardware |
| B. | a drilling tool |
| C. | an abbreviation for binary digit |
| D. | the smallest number |
| Answer» D. the smallest number | |
| 415. |
A is even or B is true. Negation of above statement is |
| A. | A is odd or B is false |
| B. | A is odd and B is false |
| C. | A is even or B is false |
| D. | A is even and B is false |
| Answer» C. A is even or B is false | |
| 416. |
The seven bit Hamming code received is 0010001. If even parity has been used, the correct code is |
| A. | 10001 |
| B. | 1110001 |
| C. | 110001 |
| D. | 11001 |
| Answer» E. | |
| 417. |
In a NAND SR latch S = 0, R = 1 then |
| A. | Q = 0 |
| B. | Q = 1, Q = 0 |
| C. | it is race condition |
| D. | none of the above |
| Answer» C. it is race condition | |
| 418. |
The hexadecimal number system is |
| A. | widely used in analyzing and programming microprocessors |
| B. | an obsolete system no more in use |
| C. | used in calculators only |
| D. | none of the above |
| Answer» B. an obsolete system no more in use | |
| 419. |
What is the result for expression (map method)? ABC + AD + D (B + C) + AC + A D |
| A. | A + D + BC |
| B. | A + D |
| C. | A D + B C |
| D. | A + D + BC |
| Answer» C. A D + B C | |
| 420. |
The logic circuit of the given figure realizes the function |
| A. | (A + B + C)(D)(E) |
| B. | (A + B + C) (D)(E) |
| C. | (A + B = C) (D)(E) |
| D. | (A + B + C)(D)(E) |
| Answer» B. (A + B + C) (D)(E) | |
| 421. |
Which of the following are included in the architecture of computer? Addressing mode, design of CPUInstruction set, data formatSecondary memory, operating system Select the correct answer using the codes given below: |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 1 and 3 |
| D. | 1, 2 and 3 |
| Answer» B. 2 and 3 | |
| 422. |
In a 4 bit D/A converter, the offset error is the output voltage when input digital voltage is |
| A. | 1111 |
| B. | 0 |
| C. | either 1111 or 0000 |
| D. | none of the above |
| Answer» C. either 1111 or 0000 | |
| 423. |
The number of programmable 16 bit registers of 6800 are |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 424. |
The most commonly used logic family is |
| A. | CMOS |
| B. | PMOS |
| C. | master is clocked when clock is low |
| D. | slave is clocked when clock is high |
| Answer» C. master is clocked when clock is low | |
| 425. |
In 8085 microprocessor, how many lines are there in data bus? |
| A. | 6 |
| B. | 8 |
| C. | 2 |
| D. | 16 |
| Answer» C. 2 | |
| 426. |
Consider the following statements ECL has least propagation delayTTL has largest fan outCMOS has highest noise marginTTL has lowest power dissipation Which of these are correct? |
| A. | 1 and 3 |
| B. | 2 and 4 |
| C. | 3 and 4 |
| D. | 1 and 2 |
| Answer» B. 2 and 4 | |
| 427. |
Computers use RC circuit for edge triggering. |
| A. | 1 |
| B. | |
| C. | POS |
| D. | SOP |
| Answer» C. POS | |
| 428. |
Which one of the following is D/A conversion technique? |
| A. | Successive approximation |
| B. | Weighted resistor |
| C. | Dual slope |
| D. | Single slope |
| Answer» C. Dual slope | |
| 429. |
Binary multiplication 1 x 0 = |
| A. | 1 |
| B. | 0 |
| C. | 10 |
| D. | 11 |
| Answer» C. 10 | |
| 430. |
What is output 'Z' of an EX-OR gate, whose all inputs are set at A? |
| A. | Z = A |
| B. | Z = 1 |
| C. | Z = 0 |
| D. | Z = A |
| Answer» D. Z = A | |
| 431. |
Effective address is calculated by adding or subtracting displacement value to |
| A. | immediate address |
| B. | Relative address |
| C. | absolute address |
| D. | base address |
| Answer» E. | |
| 432. |
The term VLSI generally refers to a digital IC having |
| A. | more than 1000 gates |
| B. | more than 100 gates |
| C. | more than 1000 but less than 9999 gates |
| D. | more than 100 but less than 999 gates |
| Answer» D. more than 100 but less than 999 gates | |
| 433. |
In a positive edge triggered JK flip flop, J = 1, K = 0 and clock pulse is rising Q will |
| A. | be 0 |
| B. | be 1 |
| C. | show no change |
| D. | toggle |
| Answer» C. show no change | |
| 434. |
In a monolithic IC, resistors are formed from |
| A. | ceramic material |
| B. | manganin wire |
| C. | P-type semiconductor |
| D. | aluminium ribbon |
| Answer» D. aluminium ribbon | |
| 435. |
Which of these are two state devices? |
| A. | Lamp |
| B. | Punched card |
| C. | Magnetic tape |
| D. | All of the above |
| Answer» E. | |
| 436. |
Which device changes serial data to parallel data? |
| A. | Counter |
| B. | Multiplexer |
| C. | Demultiplexer |
| D. | Flip flop |
| Answer» D. Flip flop | |
| 437. |
Assuming accumulator contain A 64 and the carry is set (1). What will register A and (CY) contain after CMA? |
| A. | 6 AH, 1 |
| B. | 6 AH, 0 |
| C. | 59 H, 0 |
| D. | 9 H, 0 |
| Answer» D. 9 H, 0 | |
| 438. |
In the 8421 BCD code, the decimal number 125, is written as |
| A. | 1111101 |
| B. | 0001 0010 0101 |
| C. | 7 D |
| D. | none of these |
| Answer» B. 0001 0010 0101 | |
| 439. |
In 8085 microprocessor, in order to enable RST 5.5, RST 6.5 and RST 7.5 interrupts, which of the following instruction are needed? |
| A. | EI only |
| B. | SIM only |
| C. | EI and SIM both |
| D. | None |
| Answer» D. None | |
| 440. |
ECL can be used to high frequencies in the order of |
| A. | 500 kHz |
| B. | 1 MHz |
| C. | 100 MHz |
| D. | 500 MHz |
| Answer» E. | |
| 441. |
Inputs A and B of the given figure are applied to a NAND gate. The output is LOW |
| A. | from 0 to 6 |
| B. | from 0 to 2 |
| C. | from 0 to 1 and 2 to 3 |
| D. | from 1 to 2 and 3 to 4 |
| Answer» D. from 1 to 2 and 3 to 4 | |
| 442. |
In flip flops the duration of clock pulse is about |
| A. | 3 ns |
| B. | 10 ns |
| C. | 25 ns |
| D. | 50 ns |
| Answer» B. 10 ns | |
| 443. |
When a TTL is driving an CMOS gates it is necessary to ensure that |
| A. | VOL(for TTL) ≤ VIL (for CMOS) and V0H (for TTL) ≥ VIH (for CMOS) |
| B. | V0L (for TTL) ‚â• VIL (for CMOS) |
| C. | V0H (for TTL) ≤ VIH (for CMOS) |
| D. | V0L (for TTL) ≥ VIL (for CMOS) and V0H (for TTL) ≤ VIH (for CMOS) |
| Answer» B. V0L (for TTL) ‚â• VIL (for CMOS) | |
| 444. |
In JK flip flop toggle state exists if |
| A. | J = 0, K = 1 |
| B. | J = 1, K = 0 |
| C. | J = 0, K = 0 |
| D. | J = 1, K = 1 |
| Answer» E. | |
| 445. |
In a 4 input AND gate, the total number of High outputs for 16 input states are |
| A. | 16 |
| B. | 8 |
| C. | 4 |
| D. | 1 |
| Answer» E. | |
| 446. |
74HCT00 series is |
| A. | inverting IC |
| B. | NOR IC |
| C. | SUM |
| D. | CARRY |
| Answer» C. SUM | |
| 447. |
The amplifier used in bootstrap voltage sweep should have a gain of |
| A. | 1 |
| B. | +‚àû |
| C. | -1 |
| D. | -‚àû |
| Answer» D. -‚àû | |
| 448. |
If all the LEDs in a seven segment display are turned on, the number displayed is |
| A. | 1 |
| B. | 3 |
| C. | 0 |
| D. | 8 |
| Answer» E. | |
| 449. |
Assertion (A): 2's complement arithmetic is preferred in digital computers Reason (R): The hardware required to obtain 2's complement is simple. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is true, R is false |
| D. | A is false, R is true |
| Answer» D. A is false, R is true | |
| 450. |
Which of the following is best suited for parity checking and parity generation? |
| A. | AND, OR, NOT gates |
| B. | XOR, Exclusive NOR gate |
| C. | NAND gates |
| D. | NOR gates |
| Answer» C. NAND gates | |