Undergraduate

Q. In a heat engine, if the input heat is 500 J and the work done is 300 J, what is the efficiency? (2023) 2023
  • A. 60%
  • B. 50%
  • C. 40%
  • D. 70%
Q. In a lottery, there are 10 tickets, and 2 are winning tickets. What is the probability of picking a winning ticket?
  • A. 1/5
  • B. 1/10
  • C. 1/2
  • D. 2/10
Q. In a lottery, there are 10 tickets, and 3 are winning tickets. What is the probability of picking a winning ticket? (2022)
  • A. 1/3
  • B. 1/4
  • C. 1/5
  • D. 1/2
Q. In a measurement, if the uncertainty is ±0.5 cm, what is the range of the measurement 10.0 cm? (2023)
  • A. 9.5 cm to 10.5 cm
  • B. 9.0 cm to 11.0 cm
  • C. 10.0 cm to 10.5 cm
  • D. 10.0 cm to 11.0 cm
Q. In a p-n junction, what happens when the junction is forward biased? (2019)
  • A. Depletion region widens
  • B. Depletion region narrows
  • C. No current flows
  • D. Reverse current increases
Q. In a parallel circuit with two resistors of 6Ω and 3Ω, what is the total current if a 12V battery is connected? (2021)
  • A. 2A
  • B. 4A
  • C. 6A
  • D. 8A
Q. In a parallel circuit with two resistors of 6Ω and 3Ω, what is the total resistance? (2019)
  • A.
  • B.
  • C. 1.5Ω
  • D.
Q. In a parallel RLC circuit, if R = 50 ohms, L = 0.2H, and C = 50μF, what is the total admittance? (2023)
  • A. 0.02 S
  • B. 0.04 S
  • C. 0.06 S
  • D. 0.08 S
Q. In a parallel RLC circuit, if R = 50Ω, L = 0.2 H, and C = 50μF, what is the quality factor Q? (2015)
  • A. 1
  • B. 2
  • C. 3
  • D. 4
Q. In a PN junction diode, what happens when it is forward biased? (2019)
  • A. Depletion region widens
  • B. Depletion region narrows
  • C. No current flows
  • D. Reverse current increases
Q. In a PN junction, what is formed at the junction of p-type and n-type materials? (2021)
  • A. Electric field
  • B. Magnetic field
  • C. Thermal field
  • D. Gravitational field
Q. In a predator-prey relationship, what is the primary effect of an increase in the prey population? (2021)
  • A. Decrease in predator population
  • B. Increase in predator population
  • C. Decrease in prey population
  • D. No effect on predator population
Q. In a predator-prey relationship, which of the following is true? (2022)
  • A. Predators are always larger than their prey.
  • B. Prey populations are always larger than predator populations.
  • C. Predators help control prey populations.
  • D. Prey can never escape predators.
Q. In a purely capacitive AC circuit, the current leads the voltage by how many degrees? (2022)
  • A.
  • B. 90°
  • C. 180°
  • D. 270°
Q. In a purely capacitive AC circuit, the current leads the voltage by how much phase angle? (2023)
  • A. 0 degrees
  • B. 90 degrees
  • C. 180 degrees
  • D. 270 degrees
Q. In a reaction A → B, if the concentration of A decreases from 0.8 M to 0.4 M in 20 minutes, what is the average rate of reaction? (2019)
  • A. 0.02 M/min
  • B. 0.04 M/min
  • C. 0.1 M/min
  • D. 0.05 M/min
Q. In a reaction at equilibrium, if the concentration of a reactant is increased, what will happen to the equilibrium position? (2019)
  • A. Shift to the right
  • B. Shift to the left
  • C. No change
  • D. Depends on temperature
Q. In a reaction, if the concentration of reactant A is halved, and the rate constant remains the same, how does the rate change for a first-order reaction? (2021)
  • A. Doubles
  • B. Halves
  • C. Remains the same
  • D. Quadruples
Q. In a reaction, if the concentration of reactant A is halved, and the rate of reaction decreases to one-fourth, what is the order of the reaction? (2020)
  • A. Zero
  • B. First
  • C. Second
  • D. Third
Q. In a redox reaction, which of the following statements is true? (2020)
  • A. Oxidation involves gain of electrons
  • B. Reduction involves loss of electrons
  • C. Oxidation state of an element decreases during oxidation
  • D. Reduction involves gain of electrons
Q. In a reversible reaction, if the concentration of products increases, what happens to the equilibrium position? (2021) 2021
  • A. It shifts to the left
  • B. It shifts to the right
  • C. It remains unchanged
  • D. It shifts to the center
Q. In a reversible reaction, if the concentration of products increases, what happens to the equilibrium position? (2021)
  • A. It shifts to the left
  • B. It shifts to the right
  • C. It remains unchanged
  • D. It shifts to the center
Q. In a reversible reaction, if the concentration of products increases, what happens to the rate of the forward reaction? (2021)
  • A. It increases
  • B. It decreases
  • C. It remains constant
  • D. It becomes zero
Q. In a reversible reaction, if the concentration of reactants is increased, what will happen to the equilibrium position? (2021)
  • A. It will shift to the right
  • B. It will shift to the left
  • C. It will remain unchanged
  • D. It will shift to the center
Q. In a reversible reaction, if the concentration of reactants is increased, what will happen to the position of equilibrium? (2021)
  • A. It will shift to the right
  • B. It will shift to the left
  • C. It will remain unchanged
  • D. It will shift to the center
Q. In a reversible reaction, if the forward reaction is exothermic, what can be said about the reverse reaction? (2022)
  • A. It is also exothermic
  • B. It is endothermic
  • C. It has no effect on equilibrium
  • D. It is spontaneous
Q. In a second-order reaction, if the initial concentration is 0.1 M and the rate constant is 0.05 M⁻¹s⁻¹, what is the time taken to reach half the initial concentration? (2020)
  • A. 10 s
  • B. 20 s
  • C. 5 s
  • D. 15 s
Q. In a series circuit with a 9V battery and three resistors of 1Ω, 2Ω, and 3Ω, what is the total resistance? (2019)
  • A.
  • B.
  • C.
  • D.
Q. In a series RLC circuit, at resonance, the impedance is equal to which of the following? (2020)
  • A. Zero
  • B. R
  • C. XL
  • D. XC
Q. In a series RLC circuit, if R = 10 ohms, L = 0.1H, and C = 100μF, what is the resonant frequency? (2021)
  • A. 159.15 Hz
  • B. 100 Hz
  • C. 50 Hz
  • D. 200 Hz
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