Major Competitive Exams

Q. In a communication system, if the signal-to-noise ratio (SNR) is 20 dB, what is the linear SNR?
  • A. 10
  • B. 20
  • C. 100
  • D. 200
Q. In a communication system, what does 'multiplexing' refer to?
  • A. Combining multiple signals into one
  • B. Separating signals
  • C. Amplifying signals
  • D. Encoding signals
Q. In a communication system, what does 'noise' refer to?
  • A. The desired signal
  • B. Unwanted disturbances that affect the signal
  • C. The modulation technique used
  • D. The bandwidth of the channel
Q. In a communication system, what does 'signal-to-noise ratio' (SNR) measure?
  • A. The strength of the signal relative to background noise
  • B. The total power of the signal
  • C. The bandwidth of the communication channel
  • D. The efficiency of the modulation technique
Q. In a compound microscope, which lens is the eyepiece?
  • A. Convex lens
  • B. Concave lens
  • C. Bifocal lens
  • D. Plano-convex lens
Q. In a compound microscope, which lens is the objective lens?
  • A. The lens closest to the eye
  • B. The lens closest to the object
  • C. The lens with the longer focal length
  • D. The lens with the shorter focal length
Q. In a concentration cell, if the concentration of one half-cell is 0.1 M and the other is 1 M, what is the cell potential?
  • A. 0.059 V
  • B. 0.118 V
  • C. 0.0591 V
  • D. 0.1181 V
Q. In a concentration cell, the potential difference arises due to:
  • A. Different temperatures
  • B. Different concentrations
  • C. Different pressures
  • D. Different materials
Q. In a conical pendulum, if the angle of the string with the vertical is increased, what happens to the horizontal component of the tension?
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes zero
Q. In a cyclic process, the change in internal energy is:
  • A. Positive
  • B. Negative
  • C. Zero
  • D. Depends on the path taken
Q. In a cyclic process, the change in internal energy of the system is:
  • A. Positive
  • B. Negative
  • C. Zero
  • D. Depends on the work done
Q. In a cyclic process, the net work done by the system is equal to:
  • A. The net heat added to the system
  • B. The change in internal energy
  • C. The heat lost by the system
  • D. Zero
Q. In a cyclic process, the net work done is equal to the:
  • A. Change in internal energy
  • B. Heat added to the system
  • C. Heat removed from the system
  • D. Net heat transfer
Q. In a cyclic process, the net work done is equal to: (2020)
  • A. Net heat added
  • B. Change in internal energy
  • C. Zero
  • D. Net heat removed
Q. In a cyclic process, what is the net change in internal energy of the system?
  • A. Positive
  • B. Negative
  • C. Zero
  • D. Depends on the path taken
Q. In a cyclic process, what is the net change in internal energy?
  • A. Positive
  • B. Negative
  • C. Zero
  • D. Depends on the process
Q. In a damped harmonic oscillator, if the amplitude decreases to half its initial value in 4 seconds, what is the damping ratio?
  • A. 0.25
  • B. 0.5
  • C. 0.75
  • D. 1.0
Q. In a damped harmonic oscillator, if the damping coefficient is increased, what happens to the amplitude of oscillation?
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes zero
Q. In a damped harmonic oscillator, if the damping coefficient is increased, what happens to the time period of oscillation?
  • A. Time period increases
  • B. Time period decreases
  • C. Time period remains the same
  • D. Time period becomes zero
Q. In a damped harmonic oscillator, if the mass is doubled while keeping the damping coefficient constant, what happens to the damping ratio?
  • A. Doubles
  • B. Halves
  • C. Remains the same
  • D. Increases by a factor of √2
Q. In a damped harmonic oscillator, what effect does increasing the damping coefficient have on the oscillation?
  • A. Increases amplitude
  • B. Decreases amplitude
  • C. Increases frequency
  • D. Decreases frequency
Q. In a damped harmonic oscillator, what happens to the amplitude of oscillation over time?
  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Oscillates
Q. In a damped harmonic oscillator, what happens to the amplitude over time? (2023)
  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Oscillates
Q. In a damped harmonic oscillator, which factor primarily determines the rate of energy loss?
  • A. Mass of the oscillator
  • B. Spring constant
  • C. Damping coefficient
  • D. Frequency of oscillation
Q. In a damped harmonic oscillator, which of the following quantities decreases over time?
  • A. Amplitude
  • B. Frequency
  • C. Angular frequency
  • D. Phase constant
Q. In a damped harmonic oscillator, which of the following statements is true?
  • A. Energy is conserved
  • B. Amplitude decreases over time
  • C. Frequency increases over time
  • D. Phase remains constant
Q. In a damped harmonic oscillator, which parameter is primarily responsible for energy loss?
  • A. Mass
  • B. Spring constant
  • C. Damping coefficient
  • D. Driving force
Q. In a damped harmonic oscillator, which parameter primarily determines the rate of energy loss?
  • A. Mass of the oscillator
  • B. Spring constant
  • C. Damping coefficient
  • D. Driving force
Q. In a damped oscillator, if the energy decreases to 25% of its initial value in 10 seconds, what is the damping ratio?
  • A. 0.1
  • B. 0.2
  • C. 0.3
  • D. 0.4
Q. In a Daniell cell, which metal acts as the anode?
  • A. Copper
  • B. Zinc
  • C. Silver
  • D. Lead
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