Major Competitive Exams

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Q. A capacitor of capacitance C is charged to a voltage V. If the charge is then removed, what is the potential difference across the capacitor? (2023)
  • A. 0
  • B. V
  • C. C
  • D. CV
Q. A capacitor of capacitance C is charged to a voltage V. If the voltage is halved, what is the new energy stored in the capacitor?
  • A. U/4
  • B. U/2
  • C. U
  • D. 2U
Q. A capacitor of capacitance C is charged to a voltage V. What is the charge stored in the capacitor? (2023)
  • A. C/V
  • B. CV
  • C. V/C
  • D. C^2V
Q. A capacitor of capacitance C is connected to a battery of voltage V. If the battery is removed and the capacitor is connected to another capacitor of capacitance 2C, what is the final voltage across the combination?
  • A. V/3
  • B. V/2
  • C. V
  • D. 2V
Q. A capacitor stores 5 microfarads of charge at a voltage of 10 volts. What is the energy stored in the capacitor?
  • A. 0.25 mJ
  • B. 0.5 mJ
  • C. 0.75 mJ
  • D. 1 mJ
Q. A capillary tube is dipped in water. The height of the water column in the tube is determined by which of the following?
  • A. Surface tension and density of the liquid
  • B. Only surface tension
  • C. Only density of the liquid
  • D. Viscosity of the liquid
Q. A capillary tube is dipped in water. What is the shape of the water surface inside the tube?
  • A. Flat
  • B. Concave
  • C. Convex
  • D. Irregular
Q. A capillary tube is dipped into water. How high will the water rise in the tube if the radius is 1 mm?
  • A. 2.5 cm
  • B. 5 cm
  • C. 10 cm
  • D. 15 cm
Q. A capillary tube is dipped into water. The height to which water rises in the tube is determined by:
  • A. Surface tension and density of the liquid
  • B. Only surface tension
  • C. Only density of the liquid
  • D. Viscosity of the liquid
Q. A capillary tube is dipped into water. The water rises in the tube due to which of the following?
  • A. Surface tension and adhesion
  • B. Surface tension and cohesion
  • C. Only adhesion
  • D. Only cohesion
Q. A capillary tube is dipped into water. What will happen to the water level inside the tube?
  • A. It will rise
  • B. It will fall
  • C. It will remain the same
  • D. It will oscillate
Q. A capillary tube of radius 0.5 mm is dipped in water. What is the height of the water column raised in the tube? (Surface tension = 0.072 N/m, density of water = 1000 kg/m³)
  • A. 0.5 m
  • B. 0.1 m
  • C. 0.2 m
  • D. 0.3 m
Q. A car accelerates from rest at a constant rate of 2 m/s². How far does it travel in 5 seconds? (2021)
  • A. 10 m
  • B. 20 m
  • C. 25 m
  • D. 50 m
Q. A car accelerates from rest at a rate of 2 m/s². What is its speed after 5 seconds? (2023)
  • A. 5 m/s
  • B. 10 m/s
  • C. 15 m/s
  • D. 20 m/s
Q. A car accelerates from rest at a rate of 2 m/s². What is the net force acting on the car if its mass is 1000 kg?
  • A. 200 N
  • B. 500 N
  • C. 1000 N
  • D. 2000 N
Q. A car accelerates from rest to a speed of 100 km/h in 10 seconds. What is its acceleration? (2023)
  • A. 5 m/s²
  • B. 10 m/s²
  • C. 15 m/s²
  • D. 20 m/s²
Q. A car accelerates from rest to a speed of 20 m/s in 10 seconds. What is the distance covered by the car during this time?
  • A. 50 m
  • B. 100 m
  • C. 200 m
  • D. 400 m
Q. A car accelerates from rest to a speed of 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. A car accelerates from rest to a speed of 20 m/s. If its mass is 1000 kg, what is the kinetic energy of the car at this speed? (2000)
  • A. 200 J
  • B. 1000 J
  • C. 2000 J
  • D. 4000 J
Q. A car accelerates from rest to a speed of 20 m/s. If its mass is 1000 kg, what is the work done by the engine?
  • A. 200,000 J
  • B. 100,000 J
  • C. 50,000 J
  • D. 400,000 J
Q. A car accelerates from rest to a speed of 20 m/s. If its mass is 1000 kg, what is the work done on the car? (2022)
  • A. 200,000 J
  • B. 100,000 J
  • C. 50,000 J
  • D. 400,000 J
Q. A car accelerates from rest to a speed of 20 m/s. If its mass is 1000 kg, what is the kinetic energy of the car at that speed?
  • A. 200,000 J
  • B. 100,000 J
  • C. 50,000 J
  • D. 400,000 J
Q. A car accelerates from rest to a speed of 20 m/s. If the mass of the car is 1000 kg, what is the kinetic energy of the car at that speed? (2000)
  • A. 200 J
  • B. 1000 J
  • C. 2000 J
  • D. 4000 J
Q. A car accelerates from rest to a speed of 20 m/s. If the mass of the car is 1000 kg, what is the work done by the engine?
  • A. 200,000 J
  • B. 100,000 J
  • C. 50,000 J
  • D. 400,000 J
Q. A car accelerates from rest to a speed of 30 m/s in 10 seconds. What is the acceleration of the car? (2022)
  • A. 3 m/s²
  • B. 2 m/s²
  • C. 1 m/s²
  • D. 4 m/s²
Q. A car accelerates from rest to a speed of 30 m/s in 10 seconds. What is the distance covered by the car during this time?
  • A. 150 m
  • B. 300 m
  • C. 400 m
  • D. 600 m
Q. A car accelerates from rest to a speed of 30 m/s. If the mass of the car is 800 kg, what is the work done on the car?
  • A. 360,000 J
  • B. 480,000 J
  • C. 600,000 J
  • D. 720,000 J
Q. A car accelerates uniformly from rest to a speed of 20 m/s in 10 seconds. What is the distance covered by the car during this time?
  • A. 100 m
  • B. 200 m
  • C. 300 m
  • D. 400 m
Q. A car accelerates uniformly from rest to a speed of 25 m/s in 10 seconds. What is the distance covered by the car during this time?
  • A. 100 m
  • B. 125 m
  • C. 150 m
  • D. 200 m
Q. A car covers a distance of 240 km in 3 hours. What is its speed? (2022)
  • A. 70 km/h
  • B. 80 km/h
  • C. 90 km/h
  • D. 100 km/h
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