science exam 4th

70問 • 2年前

問題一覧

1. Which of the following is true about the relationship of angle of release to the height in a projectile motion?

The greater the angle of release the higher the height of projectile motion.

2. How does the angle of release affect the range of projectile?

The maximum range is attained if the angle of release is 45°, range decreases as the angle of release decreases or increases from 45°.

3. A basketball player has thrown the ball at an angle of 30.0° and travels 10.0 m. If the ball is thrown at the same speed, at what other angle will the ball be allowed to travel 10.0 m?

60.0°

4. Four balls are thrown with the same initial velocity, but at different angles above the ground. Which diagram represents the initial velocity of the projectile have the maximum range?

30°

5. You are a beginner in playing basketball and it's hard for you to throw the ball to reach the ring. What must you do?

Position your hand in a greater angle before shooting the ball.

6. Long jump sports require a firm body to be able to jump high and project their body perfectly to get the longest distance for them to win. The following are some of the good qualities of a player except_______.

Arrogant

7. What is impulse?

The change in momentum of an object

8. Which of the following statements is NOT true about momentum?

It is a scalar quantity.

9. Two identical cars are moving at different speeds and collided with a tree as shown in the figure. Car A caused greater damage on the tree than car B. Why is this so?

Car A is moving faster therefore its impact force is higher.

10. If you were to catch a raw egg with your hands while playing egg catch and throw, how would you do it without breaking the egg?

Move the hands backward when the starts touching our hands.

11. Which of the following energy resources use heat from Earth's interior to produce steam that turns large turbines to generate electricity?

geothermal

12. Geothermal and hydroelectric power plants are facilities that produce electricity using heat and water, respectively. What is the energy transformation that takes place in electrical power plants?

mechanical energy to electrical energy.

13. Electrical energy generation involves various processes. These processes are chronologically arranged. Which of the following is the correct process in electrical energy generation? I. Energy is transferred to the consumers from substation. II. Transformers increased and decreased voltage from the power station. III. Electrical energy from power plants is distributed through substations. IV. Electrical energy is carried by high tension wires to the different substations.

II, IV, III, I

14. Various sources of energy are utilized to provide electricity to power our households. This is then carried along lines to the distribution systems located near local service area. Which of the following distribution systems is in-charge in Metro Manila?

MERALCO

15. The above figure is the typical components of a power system. What component is responsible for carrying electricity which are generated at the power plants?

Transmission

16. In the Philippines, what component are National Power Corporation (NAPOCOR), Philippine National Oil Company-Energy Development Corporation (PNOC-EDC), Aboitiz Power and First Gen Corporation belong?

Generation

17. This type of transformer has less loops in the secondary coil than in the primary coil.

Step-down

18. Transformers are classified into two types based on what they do to voltage and current. Which of the following statements is TRUE?

Step-up transformers increase voltage and decrease the current.

19. What is the best to do if you want to reduce losses in generation of electrical power?

Replace old equipment

20. You are a social media influencer and an ambassador for energy conservation. What practice should you share to save electricity and conserve energy?

Purchase energy efficient products and appliances.

21. Which of the following statements is TRUE about an object in uniformly accelerate motion? I. Velocity is constant. II. Acceleration is not zero. III. Acceleration changes slowly. IV. Velocity changes at constant rate.

II and I

22. Which scenario or object DOES NOT exhibit uniformly accelerated motion?

a barking dog

23. Objects at free fall exhibit uniformly accelerated motion. What is the value of its acceleration due to gravity?

9.8 m/s2

24. A car starts from rest and reaches a speed of 40 m/s in 10 seconds. What is the acceleration of the car?

4 m/s2

25. What is referred to as an object that is given an initial velocity and is then acted solely upon by gravitational force?

Projectile

26. If a stone is horizontally launched at a certain height, how do you describe the magnitude of its vertical velocity as it approaches the ground?

Gradually increasing

27. Analyze the following activities at home. Which of the following is not associated with projectile motion?

Mopping the floor while cleaning the house.

28. Based on the illustration what does H show?

Height

29. A projectile is launched at an angle of 300 above the horizontal. Neglecting air resistance, what are the projectile's horizontal and vertical accelerations when it reaches its maximum height?

The horizontal acceleration is zero and the vertical acceleration is -9.81 m/s2.

30. In the absence of air resistance, what must be the angle at which an object can be thrown the farthest?

45°

31. Heat is added in our body by metabolizing food, and our body does work in breathing, walking, and other activities. If we return in the same state at the end of the day, how will you describe the work and heat of our body?

The amount of heat is equal to the work done

32. Which of the following statements is NOT true about internal energy? I. Heat and internal energy are the same. II. Phase change is also a change in internal energy. III. Internal energy is the product of molecular PE and KE. IV. When heat is added to a system, its internal energy increases.

I and III

33. What is the happens to internal energy when both heat transfer (Q) and work done (W) are equal?

The internal energy remains the same.

34. How does heat and work affect a system?

Heat and work both contribute to the total internal energy of a system.

35. A heat engine absorbs 4000J of heat energy from a hot reservoir and discards 2500J into the environment. How much work is performed by the heat engine?

1500J

36. If 500 J of heat entered an engine that does not apply external work, by how much will the internal energy of the engine be raised?

500 J

37. Which statement is TRUE about work and heat transfer?

When work is done, the temperature of the system increases.

38. A heat engine absorbs 152J of heat energy from a hot reservoir and discards 43J. How much work is performed by this heat engine?

109J

39. What is the efficiency of the heat engine in questions number 38?

72%

40. It is stated that there is no 100% efficient engine because of some factors including the energy transformation of heat. Solve for the maximum efficiency of this stem engine: Suppose a steam engine receives steam at 600K. The engine uses a part of this thermal energy for work. It exhausts the rest to a condenser at a temperature of 350K.

58.33%

41. What is the momentum of the two cars after collision if its momentum before collision is 50 kgm/s?

50 kgm/s

42. A car traveling along the highway needs a certain amount of force to be brought to rest. A large force is required when a car has _______.

higher momentum.

43. A boxer quickly leans his head backward when he sees he is going to receive a jab to the head. What does this head motion indicate?

Increased contact time and decreased force. of impact.

44. In the figure, kinetic energy is being converted into potential energy from

point 2 to point 3

45. As the car moves from point 1, to point 2, and finally to point 3, the total energy of the car

stays the same, but is converted between potential and kinetic energy

46. Which event illustrates the direct transformation of potential to kinetic energy?

The wide-open spring door closes slowly.

47. Mechanical energy is defined as the sum of both the potential energy and the kinetic of an object. According to the law of energy conservation of energy, what happens to mechanical energy if the potential energy of an object decreases?

Mechanical energy remains unchanged.

48. The following activities illustrate the law of conservation of mechanical energy, EXCEPT: A. Carpenter hammering a nail.

Jerselle made a car to a stop by friction on level ground.

49. The figure above shows the energy transformation in a hydroelectric power plant. It has three main parts EXCEPT:

Spring

50. What energy is being generated when the power of the rushing water spins the turbine, which in turn spins the coils of wire inside a ring of magnets?

Kinetic energy

51. It is important for motorists to know the speed of their vehicles when driving. Which device is used to determine the speed of a moving vehicle?

speedometer

52. At what axis in the cartesian coordinate system is horizontal motion usually associated?

x-axis

53. What do you call the path followed by a projectile?

Trajectory

54. Which of the following would describe momentum?

p-mv

55. A mini dump truck full of abaca fiber collides with a motorcycle or habal-habal. The velocity of the truck and the motorcycle is the same. Which has a greater impulse? Why?

The mini dump truck because it has larger change in momentum.

56. How much is the momentum if a 2000 kg truck is traveling at 20 m/s East?

40,000 kg m/s East

57. What is the momentum of the two cars after collision if its momentum before collision is 50 kgm/s?

50 kgm/s

58. What is the unit for momentum?

kg⚫m/s

59. What word can best describe the total momentum in an isolated system?

conserved

60. The potential energy of the object at the highest point compared to its Kinetic energy at the lowest point is

greater

61. The total mechanical energy of the object at the highest point compared to its total mechanical energy at the lowest point is

equal

62. Which best describes potential energy?

Stored energy

63. What is the happens to internal energy when both heat transfer (Q) and work done (W) are equal?

The internal energy remains the same.

64. How does heat and work affect a system?

Heat and work both contribute to the total internal energy of a system.

65. Which of the following energy resources use heat from Earth's interior to produce steam that turns turbines to generate electricity?

geothermal

66. The above figure is the typical components of a power system. What component is responsible for carrying electricity which are generated at the power plants?

Transmission

67. This type of transformer has less loops in the secondary coil than in the primary coil.

Step-down

68. Transformers are classified into two types based on what they do to voltage and current. Which of the following statements is TRUE?

Step-up transformers increase voltage and decrease the current.

69. What is the best to do if you want to reduce losses in generation of electrical power?

Replace old equipment

70. You are a social media influencer and an ambassador for energy conservation. What practice should you share to save electricity and conserve energy?

Purchase energy efficient products and appliances.

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問題一覧

1. Which of the following is true about the relationship of angle of release to the height in a projectile motion?

The greater the angle of release the higher the height of projectile motion.

2. How does the angle of release affect the range of projectile?

The maximum range is attained if the angle of release is 45°, range decreases as the angle of release decreases or increases from 45°.

3. A basketball player has thrown the ball at an angle of 30.0° and travels 10.0 m. If the ball is thrown at the same speed, at what other angle will the ball be allowed to travel 10.0 m?

60.0°

4. Four balls are thrown with the same initial velocity, but at different angles above the ground. Which diagram represents the initial velocity of the projectile have the maximum range?

30°

5. You are a beginner in playing basketball and it's hard for you to throw the ball to reach the ring. What must you do?

Position your hand in a greater angle before shooting the ball.

Arrogant

7. What is impulse?

The change in momentum of an object

8. Which of the following statements is NOT true about momentum?

It is a scalar quantity.

9. Two identical cars are moving at different speeds and collided with a tree as shown in the figure. Car A caused greater damage on the tree than car B. Why is this so?

Car A is moving faster therefore its impact force is higher.

10. If you were to catch a raw egg with your hands while playing egg catch and throw, how would you do it without breaking the egg?

Move the hands backward when the starts touching our hands.

11. Which of the following energy resources use heat from Earth's interior to produce steam that turns large turbines to generate electricity?

geothermal

mechanical energy to electrical energy.

II, IV, III, I

MERALCO

15. The above figure is the typical components of a power system. What component is responsible for carrying electricity which are generated at the power plants?

Transmission

Generation

17. This type of transformer has less loops in the secondary coil than in the primary coil.

Step-down

18. Transformers are classified into two types based on what they do to voltage and current. Which of the following statements is TRUE?

Step-up transformers increase voltage and decrease the current.

19. What is the best to do if you want to reduce losses in generation of electrical power?

Replace old equipment

20. You are a social media influencer and an ambassador for energy conservation. What practice should you share to save electricity and conserve energy?

Purchase energy efficient products and appliances.

II and I

22. Which scenario or object DOES NOT exhibit uniformly accelerated motion?

a barking dog

23. Objects at free fall exhibit uniformly accelerated motion. What is the value of its acceleration due to gravity?

9.8 m/s2

24. A car starts from rest and reaches a speed of 40 m/s in 10 seconds. What is the acceleration of the car?

4 m/s2

25. What is referred to as an object that is given an initial velocity and is then acted solely upon by gravitational force?

Projectile

26. If a stone is horizontally launched at a certain height, how do you describe the magnitude of its vertical velocity as it approaches the ground?

Gradually increasing

27. Analyze the following activities at home. Which of the following is not associated with projectile motion?

Mopping the floor while cleaning the house.

28. Based on the illustration what does H show?

Height

29. A projectile is launched at an angle of 300 above the horizontal. Neglecting air resistance, what are the projectile's horizontal and vertical accelerations when it reaches its maximum height?

The horizontal acceleration is zero and the vertical acceleration is -9.81 m/s2.

30. In the absence of air resistance, what must be the angle at which an object can be thrown the farthest?

45°

The amount of heat is equal to the work done

I and III

33. What is the happens to internal energy when both heat transfer (Q) and work done (W) are equal?

The internal energy remains the same.

34. How does heat and work affect a system?

Heat and work both contribute to the total internal energy of a system.

35. A heat engine absorbs 4000J of heat energy from a hot reservoir and discards 2500J into the environment. How much work is performed by the heat engine?

1500J

36. If 500 J of heat entered an engine that does not apply external work, by how much will the internal energy of the engine be raised?

500 J

37. Which statement is TRUE about work and heat transfer?

When work is done, the temperature of the system increases.

38. A heat engine absorbs 152J of heat energy from a hot reservoir and discards 43J. How much work is performed by this heat engine?

109J

39. What is the efficiency of the heat engine in questions number 38?

72%

58.33%

41. What is the momentum of the two cars after collision if its momentum before collision is 50 kgm/s?

50 kgm/s

42. A car traveling along the highway needs a certain amount of force to be brought to rest. A large force is required when a car has _______.

higher momentum.

43. A boxer quickly leans his head backward when he sees he is going to receive a jab to the head. What does this head motion indicate?

Increased contact time and decreased force. of impact.

44. In the figure, kinetic energy is being converted into potential energy from

point 2 to point 3

45. As the car moves from point 1, to point 2, and finally to point 3, the total energy of the car

stays the same, but is converted between potential and kinetic energy

46. Which event illustrates the direct transformation of potential to kinetic energy?

The wide-open spring door closes slowly.

Mechanical energy remains unchanged.

48. The following activities illustrate the law of conservation of mechanical energy, EXCEPT: A. Carpenter hammering a nail.

Jerselle made a car to a stop by friction on level ground.

49. The figure above shows the energy transformation in a hydroelectric power plant. It has three main parts EXCEPT:

Spring

50. What energy is being generated when the power of the rushing water spins the turbine, which in turn spins the coils of wire inside a ring of magnets?

Kinetic energy

51. It is important for motorists to know the speed of their vehicles when driving. Which device is used to determine the speed of a moving vehicle?

speedometer

52. At what axis in the cartesian coordinate system is horizontal motion usually associated?

x-axis

53. What do you call the path followed by a projectile?

Trajectory

54. Which of the following would describe momentum?

p-mv

55. A mini dump truck full of abaca fiber collides with a motorcycle or habal-habal. The velocity of the truck and the motorcycle is the same. Which has a greater impulse? Why?

The mini dump truck because it has larger change in momentum.

56. How much is the momentum if a 2000 kg truck is traveling at 20 m/s East?

40,000 kg m/s East

57. What is the momentum of the two cars after collision if its momentum before collision is 50 kgm/s?

50 kgm/s

58. What is the unit for momentum?

kg⚫m/s

59. What word can best describe the total momentum in an isolated system?

conserved

60. The potential energy of the object at the highest point compared to its Kinetic energy at the lowest point is

greater

61. The total mechanical energy of the object at the highest point compared to its total mechanical energy at the lowest point is

equal

62. Which best describes potential energy?

Stored energy

63. What is the happens to internal energy when both heat transfer (Q) and work done (W) are equal?

The internal energy remains the same.

64. How does heat and work affect a system?

Heat and work both contribute to the total internal energy of a system.

65. Which of the following energy resources use heat from Earth's interior to produce steam that turns turbines to generate electricity?

geothermal

66. The above figure is the typical components of a power system. What component is responsible for carrying electricity which are generated at the power plants?

Transmission

67. This type of transformer has less loops in the secondary coil than in the primary coil.

Step-down

68. Transformers are classified into two types based on what they do to voltage and current. Which of the following statements is TRUE?

Step-up transformers increase voltage and decrease the current.

69. What is the best to do if you want to reduce losses in generation of electrical power?

Replace old equipment

70. You are a social media influencer and an ambassador for energy conservation. What practice should you share to save electricity and conserve energy?

Purchase energy efficient products and appliances.