Uzbekistan National Certificate (Milliy sertifikat) Ā· Physics and Chemistry

Physics

56 practice questions, each with the answer and an explanation.

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All 56 questions

  1. What is the SI unit of force?
  2. What is the approximate speed of light in a vacuum?
  3. A car starts from rest and accelerates at 3 m/s. What is its speed after 5 s?
  4. A resistor of 4 ohms is connected to a 12 V battery. What current flows?
  5. What force acts on a 5 kg object that accelerates at 2 m/s?
  6. What is the kinetic energy of a 2 kg object moving at 3 m/s?
  7. What is the weight of a 10 kg mass on Earth, using m/s?
  8. A pendulum has a period of 0.02 s. What is its frequency?
  9. Which statement expresses Newton's third law?
  10. What happens to a ray of light entering glass from air at an angle?
  11. Two resistors of 3 ohms and 6 ohms are connected in series. What is the total resistance?
  12. A device draws 2 A from a 220 V supply. What is its power?
  13. A force of 20 N moves an object 3 m in the direction of the force. How much work is done?
  14. A stone is dropped from rest from a height of 45 m. Using m/s and ignoring air resistance, how long does it take to hit the ground?
  15. Resistors of 6 ohms and 3 ohms are connected in parallel. What is the equivalent resistance?
  16. A 2 kg cart moving at 3 m/s collides with a 1 kg cart at rest, and they stick together. What is their common speed?
  17. How much heat is needed to warm 0.5 kg of water by 10 K? (specific heat capacity 4200 J/(kg K))
  18. A force of 200 N acts on an area of 0.5 m. What is the pressure?
  19. What type of wave is sound in air?
  20. A ball is thrown vertically upward at 20 m/s. Taking m/s and ignoring air resistance, what is its maximum height?
  21. What force gives a mass of 18 kg an acceleration of 7 m/sĀ²?
  22. What is the kinetic energy of a 10 kg body moving at 13 m/s?
  23. A force of 20 N acts at 60Ā° to the horizontal and moves a body 4 m along the horizontal. How much work does it do?
  24. A machine does 1500 J of work in 20 s. What is its power?
  25. A machine takes in 500 J of energy and gives out 375 J of useful work. What is its efficiency?
  26. A spring of constant 200 N/m is stretched by 0.2 m. How much energy is stored in it?
  27. Two resistors of 15 Ī© and 10 Ī© are connected in parallel. What is their combined resistance?
  28. A device on a 220 V supply draws 0.5 A. What is its power?
  29. Two point charges of 1 Ī¼C and 4 Ī¼C are 0.2 m apart in air. What is the force between them? (k = 9 Ɨ 10ā¹ N mĀ²/CĀ²)
  30. A 2 Ī¼F capacitor is charged to 20 V. How much charge does it store?
  31. A wire 0.5 m long carries 5 A at right angles to a magnetic field of 2 T. What force acts on it?
  32. A transformer has 200 turns on the primary coil and 400 turns on the secondary. The primary voltage is 220 V. What is the secondary voltage?
  33. How much heat is needed to warm 5 kg of water by 20 Ā°C? (specific heat capacity of water = 4200 J/(kg Ā°C))
  34. A gas in a rigid container is at 200 kPa and 250 K. It is heated to 500 K. What is the new pressure?
  35. A body moves in a circle of radius 20 m at 20 m/s. What is its centripetal acceleration?
  36. A stone is dropped from a height of 45 m. How long does it take to reach the ground? (take g = 10 m/sĀ²)
  37. A body of volume 0.002 mĀ³ is fully immersed in a liquid of density 1000 kg/mĀ³. What is the upthrust? (take g = 10 m/sĀ²)
  38. A 6 kg trolley moving at 4 m/s hits a stationary 2 kg trolley and they stick together. What is their common speed?
  39. A body moving at 11 m/s accelerates uniformly at 7 m/sĀ² for 5 s. What is its final speed?
  40. What force gives a mass of 8 kg an acceleration of 6 m/sĀ²?
  41. What is the kinetic energy of a 2 kg body moving at 13 m/s?
  42. How much gravitational potential energy does a 10 kg mass gain when lifted 4 m? (take g = 10 m/sĀ²)
  43. A force of 100 N acts at 60Ā° to the horizontal and moves a body 8 m along the horizontal. How much work does it do?
  44. A machine does 600 J of work in 30 s. What is its power?
  45. A machine takes in 400 J of energy and gives out 300 J of useful work. What is its efficiency?
  46. What is the pressure due to a column of liquid of density 1000 kg/mĀ³ and depth 20 m? (take g = 10 m/sĀ²)
  47. A wave has a frequency of 200 Hz and a wavelength of 0.5 m. What is its speed?
  48. A device on a 24 V supply draws 5 A. What is its power?
  49. A wire 0.2 m long carries 2 A at right angles to a magnetic field of 2 T. What force acts on it?
  50. A transformer has 200 turns on the primary coil and 400 turns on the secondary. The primary voltage is 230 V. What is the secondary voltage?
  51. A gas in a rigid container is at 200 kPa and 300 K. It is cooled to 150 K. What is the new pressure?
  52. An object is placed 60 cm from a convex lens of focal length 20 cm. How far from the lens is the image?
  53. A body moves in a circle of radius 5 m at 10 m/s. What is its centripetal acceleration?
  54. A 10 kg load hangs 2 m from the pivot of a light uniform lever. What force at 0.5 m on the other side of the pivot balances it? (take g = 10 m/sĀ²)
  55. What is the kinetic energy of a 5 kg body moving at 6 m/s?
  56. A force of 100 N acts at 60Ā° to the horizontal and moves a body 13 m along the horizontal. How much work does it do?

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