Question 1
Digital ElectronicsNumber Systems
What is the binary equivalent of decimal number 10?
Correct Answer: B. 1010
Explanation: Decimal 10 equals 8 + 2, which is 1010 in binary.
Reference: Binary number system fundamentals
DRDO MCQs
Practice questions are arranged in pages of up to 100 MCQs.
Question 2
Communication SystemsAnalog Modulation
In amplitude modulation, which carrier parameter is varied according to the message signal?
Correct Answer: C. Amplitude
Explanation: In conventional amplitude modulation, the amplitude of the carrier varies with the instantaneous message signal.
Reference: Amplitude modulation fundamentals
Question 3
Signals & SystemsSampling
According to the sampling theorem, a band-limited signal should be sampled at a rate of at least?
Correct Answer: C. Twice the highest signal frequency
Explanation: For ideal reconstruction, the sampling frequency must be at least twice the highest frequency component of the band-limited signal.
Reference: Nyquist sampling theorem
Question 4
Microprocessors & Microcontrollers8085 Microprocessor
The 8085 microprocessor has an address bus of how many bits?
Correct Answer: C. 16 bits
Explanation: The 8085 has a 16-bit address bus, allowing it to address 2^16 or 64 KB of memory locations.
Reference: 8085 architecture
Question 5
Control SystemsStability
For a stable continuous-time linear system, poles of the closed-loop transfer function should generally lie in which region of the s-plane?
Correct Answer: B. Left half-plane
Explanation: For an asymptotically stable continuous-time LTI closed-loop system, its poles lie in the left half of the s-plane.
Reference: Classical control-system stability criterion
Question 6
Digital ElectronicsLogic Gates
Which logic gate gives a HIGH output only when all its inputs are HIGH?
Correct Answer: C. AND gate
Explanation: An AND gate produces logic HIGH only when all of its inputs are HIGH.
Reference: Standard digital electronics principle