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20 pt

units. Forces and motion. Work And energy. Momentum and collision. Electricity and magnetism. 10 pt. 10 pt. 10 pt. 10 pt. 10 pt. 20 pt. 20 pt. 20 pt. 20 pt. 20 pt. 30 pt. 30 pt. 30 pt. 30 pt. 30 pt. 40 pt. 40 pt. 40 pt. 40 pt. 40 pt. 50 pt. 50 pt. 50 pt.

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20 pt

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  1. units Forces and motion Work And energy Momentum and collision Electricity and magnetism 10 pt 10 pt 10 pt 10 pt 10 pt 20 pt 20 pt 20 pt 20 pt 20 pt 30 pt 30 pt 30 pt 30 pt 30 pt 40 pt 40 pt 40 pt 40 pt 40 pt 50 pt 50 pt 50 pt 50 pt 50 pt

  2. Q1:The basic SI units for measuring mass, time, and length are: Stop watch

  3. AnswerQ1: Kilogram(Kg) Second(s) Meter(m)

  4. Q2:What do the following symbols stand for? g mg t µm ms Stop watch

  5. Answer Q2: mass mass Time length time

  6. Q3:Write down the value of: 1750 g in kg 62µs in s Stop watch

  7. Answer Q3 1750/1000=1.750 kg 62/10000000=62x10^-6 s

  8. Q4:The 500 pages of a book have a mass of 2.50 kg. What is the mass of each page • in kg? • in mg? Stop watch

  9. answerQ4: a)2.5/500=5 x 10 ^-3 kg or 0.005 kg b)0.005 x 1000=5 mg

  10. Q5:Atankful of liquid has a volume of 0.2 m^3.what is the volume in a)Liters b)cm^3 c)ml Stop watch

  11. AnswerQ5: a) m^3=1000 liter So, 0.2 x 1000=200 liter B(m^3=1000000 cm^3 So, 0.2 x 10000000=2 x 10^5 cm^3 c)cm^3=ml So, 0.2 x 10000000=2 x 10^5 ml

  12. Q1:true or false: If a car moves 90 m in 3s,its average speed is 30 m/s? Stop watch

  13. Answer Q1 True: v=d/t:v=90/3=30 m/s

  14. Q2:how is velocity different from speed? Stop watch

  15. Answer Q2 Velocity is a vector quantity Speed is a scalar quantity

  16. Q3:what equation links resultant force , mass, and acceleration? Stop watch

  17. Answer Q3 F = m x a

  18. Q4:what the resultant force on the car below? 500 N total frictional force 1500 N force from engine Stop watch

  19. Answer Q4 Fnet = 1500-500=1000 N

  20. Q5:list three differences between mass and weight? Stop watch

  21. Answer Q5

  22. Q1: Work is done when a. the displacement is not zero. b. the displacement is zero. c. the force is zero. d. the force and displacement are perpendicular. Stop watch

  23. Answer Q1 ANS: A

  24. If the sign of work is negative, Q2:If the sign of work is negative, a. the displacement is perpendicular to the force. b. the displacement is in the direction opposite the force. c.the displacement is in the same direction as the force. d.no work is done. Stop watch

  25. Answer Q2 ANS: B

  26. Q3:What is the potential energy of a 1.0 kg mass 1.0 m above the ground? a.1.0 J b.10 J c.96 J Stop watch

  27. Answer Q3 ANS: B

  28. Q4:Which of the following is the rate at which work is done? a.potential energy b. kinetic energy c. mechanical energy d. power Stop watch

  29. Answer Q4 ANS: D

  30. Q5:A worker pushes a box with a horizontal force of 50.0 N over a level distance of 5.0 m. If a frictional force of 43 N acts on the box in a direction opposite to that of the worker, what net work is done on the box? Stop watch

  31. ANS Q5 : 35 J

  32. Q1:Which of the following equations can be used to directly calculate an object’s momentum, p? a. p = m v b. p=m/v. c. p = FΔt d. Δp = FΔt Stop watch

  33. Answer Q1 ANS: A

  34. Q2:What are the SI units for momentum? a. N·m b. J c. kg·m/s d. kg·m/s^2 Stop watch

  35. Answer Q2 ANS: C

  36. Q3:After colliding, objects are deformed and lose some kinetic energy. Identify the type of collision. a. Elastic b. nearly elastic c. inelastic d. perfectly inelastic Stop watch

  37. Answer Q3 ANS: C

  38. Q4 An ice skater initially skating at a velocity of 3 m/s speeds up to a velocity of 5 m/s. How does the momentum of the skater change? Stop watch

  39. Answer Q4 The skater’s momentum increases.

  40. Stop watch Q5 - -

  41. Answer Q5 m1 x v1f = -(m2 x v2f) V1f= -(m2 x v2f/m1) V1f=-(1.8 x 2/1.2) V1f = - 3 m/s

  42. Q1:What effect will be produced on a capacitor if the separation between the plates is increased? a. It will increase the charge. c. It will increase the capacitance. b. It will decrease the charge. d. It will decrease the capacitance. Stop watch

  43. Answer Q1 ANS: D

  44. Q2:How is current affected if the number of charge carriers decreases? a. The current increases. b. The current decreases. c. The current initially decreases and then is gradually restored. d. The current is not affected. Stop watch

  45. Answer Q2 ANS: B

  46. Q3:What type of electric current is shown in the figure above? Stop watch

  47. ANS Q3: direct current

  48. Q4:A 0.47 µF capacitor holds 1.0 µC of charge on each plate. What is the potential difference across the capacitor? Stop watch

  49. ANS Q4: 2.1 V

  50. Q5:If a 325 W heater has a current of 6.0 A, what is the resistance of the heating element? • 88 W • 54 W • c.9.0 W • d.4.5 W Stop watch

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