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A choke coil is used to control current in an AC circuit. It is preferred over a resistor because it

Decreases the current without power loss

The transformer works on the principle of

Mutual induction and self-induction both

In a step-up transformer, the number of turns in the secondary coil is

Not related to the primary coil

The efficiency of a transformer is defined as the ratio of

Output voltage to input voltage

Input voltage to output voltage

Pharm-D Entry Test (D Pharmacy) Physics Practice MCQs Solved Online

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Pharm-D Entry Test (D Pharmacy) Physics Practice sample MCQs

Q1. The rms value of an AC is defined as the value of that DC which produces the same heating effect in a given resistance.
- A) Average power dissipation
- B) Peak current
- C) Root mean square current
- D) Instantaneous current
Answer: Root mean square current
Q2. In an AC circuit, the opposition to the flow of current is called
- A) Resistance
- B) Reactance
- C) Impedance
- D) Conductance
Answer: Impedance
Q3. A capacitor in an AC circuit has a reactance given by Xc = 1 / (2πfC). What happens to Xc when frequency is doubled?
- A) It doubles
- B) It halves
- C) It remains the same
- D) It becomes zero
Answer: It halves
Q4. The unit of inductance is
- A) Henry
- B) Farad
- C) Ohm
- D) Tesla
Answer: Henry
Q5. The power factor of an AC circuit is given by
- A) cosφ
- B) sinφ
- C) tanφ
- D) cotφ
Answer: cosφ
Q6. An inductor is connected to an AC source. If the frequency of the source is doubled, the reactance of the inductor
- A) Remains the same
- B) Doubles
- C) Halves
- D) Becomes zero
Answer: Doubles
Q7. The average power dissipated in an AC circuit is maximum when the power factor is
- A) 0
- B) 0.5
- C) 1
- D) -1
Answer: 1
Q8. The resonance frequency of an LC circuit is given by
- A) 1 / (2π√LC)
- B) 1 / (2πLC)
- C) √(L/C)
- D) √(C/L)
Answer: 1 / (2π√LC)
Q9. The quality factor (Q) of an LC circuit is a measure of its
- A) Bandwidth
- B) Resonance frequency
- C) Selectivity
- D) Power factor
Answer: Selectivity
Q10. In an AC circuit, the voltage and current are in phase when the circuit contains only
- A) Resistance
- B) Inductance
- C) Capacitance
- D) Impedance
Answer: Resistance
Q11. The impedance of a series RLC circuit at resonance is
- A) R
- B) Xl
- C) Xc
- D) √(R^2 + (Xl - Xc)^2)
Answer: R
Q12. The rms value of a sinusoidally varying quantity is
- A) 1/√2 times its peak value
- B) 1/2 times its peak value
- C) Equal to its peak value
- D) √2 times its peak value
Answer: 1/√2 times its peak value
Q13. A choke coil is used to control current in an AC circuit. It is preferred over a resistor because it
- A) Increases the current
- B) Decreases the current without power loss
- C) Increases the power factor
- D) Decreases the impedance
Answer: Decreases the current without power loss
Q14. The power dissipated in a pure inductor or capacitor is
- A) Maximum
- B) Minimum
- C) Zero
- D) Average
Answer: Zero
Q15. The current in an AC circuit is wattless when the circuit contains only
- A) Resistance
- B) Inductance or capacitance
- C) Impedance
- D) Conductance
Answer: Inductance or capacitance
Q16. The transformer works on the principle of
- A) Mutual induction
- B) Self-induction
- C) Electromagnetic induction
- D) Mutual induction and self-induction both
Answer: Mutual induction
Q17. In a step-up transformer, the number of turns in the secondary coil is
- A) Less than the primary coil
- B) Equal to the primary coil
- C) More than the primary coil
- D) Not related to the primary coil
Answer: More than the primary coil
Q18. The efficiency of a transformer is defined as the ratio of
- A) Output power to input power
- B) Input power to output power
- C) Output voltage to input voltage
- D) Input voltage to output voltage
Answer: Output power to input power
Q19. The core of a transformer is laminated to reduce
- A) Hysteresis loss
- B) Eddy current loss
- C) Copper loss
- D) Flux leakage
Answer: Eddy current loss
Q20. In an LCR circuit, the sharpness of resonance is determined by
- A) Resistance
- B) Inductance
- C) Capacitance
- D) Quality factor
Answer: Quality factor