Major Competitive Exams

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Q. If a capacitor is charged and then short-circuited, what happens to the charge on the capacitor?
  • A. It remains the same
  • B. It is discharged
  • C. It increases
  • D. It becomes zero
Q. If a capacitor is charged to 12V and has a capacitance of 6μF, what is the stored energy? (2022)
  • A. 0.432 mJ
  • B. 0.072 mJ
  • C. 0.864 mJ
  • D. 0.216 mJ
Q. If a capacitor is charged to a voltage of 10V and has a capacitance of 5μF, what is the charge on the capacitor? (2022)
  • A. 50μC
  • B. 100μC
  • C. 10μC
  • D. 5μC
Q. If a capacitor is charged to a voltage of 5 V and then disconnected from the battery, what happens to the charge on the capacitor if the voltage is increased to 10 V? (2023)
  • A. Charge increases
  • B. Charge decreases
  • C. Charge remains the same
  • D. Charge becomes zero
Q. If a capacitor is charged to a voltage V and then connected in parallel with an uncharged capacitor, what will be the final voltage across both capacitors?
  • A. V
  • B. V/2
  • C. 2V
  • D. 0
Q. If a capacitor is charged to a voltage V and then connected to a resistor R, what is the time constant of the circuit?
  • A. RC
  • B. R/C
  • C. C/R
  • D. 1/RC
Q. If a capacitor is charged to a voltage V and then short-circuited, what happens to the energy stored in the capacitor?
  • A. It is conserved
  • B. It is dissipated as heat
  • C. It increases
  • D. It becomes zero
Q. If a capacitor is charged to a voltage V and then short-circuited, what happens to the charge on the capacitor?
  • A. It remains the same
  • B. It becomes zero
  • C. It doubles
  • D. It halves
Q. If a capacitor is connected to a DC voltage source, what will happen to the current over time?
  • A. It remains constant
  • B. It increases
  • C. It decreases to zero
  • D. It oscillates
Q. If a capacitor is connected to an AC source, how does the current behave?
  • A. It is constant
  • B. It leads the voltage
  • C. It lags the voltage
  • D. It is zero
Q. If a capacitor is fully charged and then short-circuited, what happens to the stored energy?
  • A. It is released as heat
  • B. It is stored in the circuit
  • C. It remains in the capacitor
  • D. It is lost
Q. If a capacitor is fully discharged and then connected to a voltage source, what is the initial current through the circuit?
  • A. Zero
  • B. Maximum
  • C. Depends on resistance
  • D. Infinite
Q. If a capacitor of capacitance 4μF is connected to a 12V battery, what is the charge on the capacitor?
  • A. 48μC
  • B. 12μC
  • C. 4μC
  • D. 24μC
Q. If a capacitor of capacitance C is charged to a voltage V, what is the energy stored in the capacitor?
  • A. 1/2 CV^2
  • B. CV
  • C. V^2 / C
  • D. C / V
Q. If a capacitor of capacitance C is connected to a voltage source V, what is the charge on the capacitor?
  • A. C/V
  • B. V/C
  • C. CV
  • D. V^2/C
Q. If a capacitor with capacitance C is connected to a voltage V, what is the charge stored in the capacitor?
  • A. C/V
  • B. V/C
  • C. C * V
  • D. C + V
Q. If a capillary tube has a radius of 0.5 mm and the surface tension of the liquid is 0.072 N/m, what is the height of the liquid column in the tube? (Assume density = 1000 kg/m³)
  • A. 0.0144 m
  • B. 0.072 m
  • C. 0.0288 m
  • D. 0.036 m
Q. If a car accelerates from rest at a rate of 2 m/s², what will be its speed after 5 seconds? (2023)
  • A. 5 m/s
  • B. 10 m/s
  • C. 15 m/s
  • D. 20 m/s
Q. If a car accelerates from rest to 20 m/s in 5 seconds, what is its acceleration?
  • A. 2 m/s²
  • B. 4 m/s²
  • C. 5 m/s²
  • D. 10 m/s²
Q. If a car accelerates from rest to a speed of 20 m/s, and its mass is 1000 kg, what is the kinetic energy of the car at that speed? (2020)
  • A. 200 J
  • B. 1000 J
  • C. 2000 J
  • D. 4000 J
Q. If a car accelerates from rest to a speed of 20 m/s, and its mass is 1000 kg, what is the kinetic energy gained by the car? (2021)
  • A. 200,000 J
  • B. 100,000 J
  • C. 50,000 J
  • D. 400,000 J
Q. If a car accelerates from rest to a speed of 20 m/s, what is the kinetic energy of the car if its mass is 1000 kg?
  • A. 200,000 J
  • B. 100,000 J
  • C. 50,000 J
  • D. 400,000 J
Q. If a car accelerates from rest to a speed of 25 m/s in 5 seconds, what is its acceleration?
  • A. 2 m/s²
  • B. 3 m/s²
  • C. 4 m/s²
  • D. 5 m/s²
Q. If a car accelerates uniformly from rest to a speed of 25 m/s in 10 seconds, what is the distance covered during this time? (2023)
  • A. 125 m
  • B. 150 m
  • C. 200 m
  • D. 250 m
Q. If a car accelerates uniformly from rest to a speed of 72 km/h in 10 seconds, what is its acceleration? (2023)
  • A. 2 m/s²
  • B. 3 m/s²
  • C. 4 m/s²
  • D. 5 m/s²
Q. If a car consumes 8 liters of fuel for every 100 km, how much fuel is needed for a 250 km trip?
  • A. 15 liters
  • B. 16 liters
  • C. 18 liters
  • D. 20 liters
Q. If a car covers 240 km in 3 hours, what is its average speed?
  • A. 70 km/h
  • B. 80 km/h
  • C. 90 km/h
  • D. 100 km/h
Q. If a car covers a distance of 150 km in 3 hours, what is its speed in km/h?
  • A. 45
  • B. 50
  • C. 55
  • D. 60
Q. If a car covers a distance of 240 km in 3 hours, what is its speed in km/h? (2020)
  • A. 70 km/h
  • B. 80 km/h
  • C. 90 km/h
  • D. 100 km/h
Q. If a car does 2000 J of work in moving a distance of 50 m, what is the average force exerted? (2023)
  • A. 40 N
  • B. 50 N
  • C. 60 N
  • D. 30 N
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