science 8 quarter 1 examination review for students

exam review

1. Look at the boys playing tug of war below. Assuming that each of the boys can exert a 20N force, who will win the game? A. Only one boy B. The two boys C. No one won the game D. Cannot be determined

2. Look at the boys playing tug of war below. Assuming that each of the boys can exert a 20N force, who will win the game? A. Only one boy B. The two boys C. No one won the game D. Cannot be determined

3. If you double the velocity of a moving bike, what will happen to its kinetic energy? A. It is zero B. It is halved C. It is doubled D. It increased four times

4. If you double the velocity of a moving bike, what will happen to its kinetic energy? A. It is zero B. It is halved C. It is doubled D. It increased four times

5. Which factor would cause the potential energy of a student walking on the ground to become zero? A. Its mass since it is constant. B. Its velocity since it is always changing. C. The gravitation since it is constantly fluctuating. D. Its elevation (height) since it is leveled on the ground.

6. Which factor would cause the potential energy of a student walking on the ground to become zero? A. Its mass since it is constant. B. Its velocity since it is always changing. C. The gravitation since it is constantly fluctuating. D. Its elevation (height) since it is leveled on the ground.

7. Which of the following given situations DOES NOT indicate Newton’s Third Law of Motion? A. The upward movement when a rocket ship takes off. B. Recoiling of a cannon after firing a shot. C. A car speeding up. D. Rowing a boat.

8. Which of the following given situations DOES NOT indicate Newton’s Third Law of Motion? A. The upward movement when a rocket ship takes off. B. Recoiling of a cannon after firing a shot. C. A car speeding up. D. Rowing a boat.

9. Lake Sebu is one of the tourist attractions because of its natural scenery and cultural landscape. The place is cold with an average air temperature of 24 ̊ C. Given this air temperature, what could be the speed of sound? V= 331m/s + 0.6 m/s/ ̊ C (T) A. 322 2 m/s C. 345.4 m/s B. 335.3 m/s D. 355.5 m/s

10. Lake Sebu is one of the tourist attractions because of its natural scenery and cultural landscape. The place is cold with an average air temperature of 24 ̊ C. Given this air temperature, what could be the speed of sound? V= 331m/s + 0.6 m/s/ ̊ C (T) A. 322 2 m/s C. 345.4 m/s B. 335.3 m/s D. 355.5 m/s

11. When white light enters into a prism, what color appears on top? A. Blue C. Red B. Green D. Violet

12. When white light enters into a prism, what color appears on top? A. Blue C. Red B. Green D. Violet

13. What did you observe about wavelengths and frequencies of the different colors of light? A. As the wavelength increases the frequency also increases. B. As the wavelength decreases the frequency also decreases. C. As the wavelength increases the frequency decreases. D. None of the choices.

14. What did you observe about wavelengths and frequencies of the different colors of light? A. As the wavelength increases the frequency also increases. B. As the wavelength decreases the frequency also decreases. C. As the wavelength increases the frequency decreases. D. None of the choices.

15. Find speed of the wave with the frequency of 3 Hz or 1/s with a wavelength of 30 m. v= fʎ A. 10 m/s C. 33 m/s B. 27 m/s D. 90 m/s

16. Find speed of the wave with the frequency of 3 Hz or 1/s with a wavelength of 30 m. v= fʎ A. 10 m/s C. 33 m/s B. 27 m/s D. 90 m/s

17. When red light and green light shine on the same place on a piece of white paper, the spot appears to be _____. A. black C. white B. brown D. yellow

18. When red light and green light shine on the same place on a piece of white paper, the spot appears to be _____. A. black C. white B. brown D. yellow

19. What is used when measuring the amount of voltage that flows in the circuit? A. Ammeter C. Richter scale B. Thermometer D. Voltmeter

20. What is used when measuring the amount of voltage that flows in the circuit? A. Ammeter C. Richter scale B. Thermometer D. Voltmeter

21. What does the letter 'Ω' stand for in Ohm's Law? A. Current C. Resistance B. Inductance D. Voltage

22. What does the letter 'Ω' stand for in Ohm's Law? A. Current C. Resistance B. Inductance D. Voltage

23. Ohm's Law is a formula used to calculate the relationship between voltage, current and resistance in an electrical circuit.

24. In Ohm’s Law, _______ is directly proportional to ________. ampere; voltage current; resistance current; voltage D. voltage; resistance

25. In Ohm’s Law, _______ is directly proportional to ________. ampere; voltage current; resistance current; voltage D. voltage; resistance

26. Refer to the diagram below: Which of the following schematic diagrams above correctly represents a simple circuit?

27. Refer to the diagram below: Which of the following schematic diagrams above correctly represents a simple circuit?

28. Refer to the diagram below: Which two elements are connected in parallel? A. A and B C. C and D B. B and C D. A and D

29. Refer to the diagram below: Which two elements are connected in parallel? A. A and B C. C and D B. B and C D. A and D

30. For components connected in series, the total resistance of two components is __________. more than one path lower than each component sum of the resistance of each component D. sum of the currents of each component

31. For components connected in series, the total resistance of two components is __________. more than one path lower than each component sum of the resistance of each component D. sum of the currents of each component

32. What is the voltage across a 6-ohm resistor when 3 amperes current passes through it? V=IR A. 3 V C. 18V B. 9V D. 36V

33. What is the voltage across a 6-ohm resistor when 3 amperes current passes through it? V=IR A. 3 V C. 18V B. 9V D. 36V

34. What is the amount of current that flows in the circuit with an amount of voltage equal to 50 volts and the resistance of 10 ohms? A. 3 A B. 5 A C. 10 A D. 12 A

35. What is the amount of current that flows in the circuit with an amount of voltage equal to 50 volts and the resistance of 10 ohms? A. 3 A B. 5 A C. 10 A D. 12 A

36. What is the name of this part that opens and closes an electric circuit? A. Load C. Switch B. Power source D. Wire

37. What is the name of this part that opens and closes an electric circuit? A. Load C. Switch B. Power source D. Wire

38. Which of the following electrical devices protect the user of the appliance from an electrical shock by preventing any possibility of the external casing becoming live? A. Circuit breaker B. Double insulation C. Earth ground D. Fuse

39. Which of the following electrical devices protect the user of the appliance from an electrical shock by preventing any possibility of the external casing becoming live? A. Circuit breaker B. Double insulation C. Earth ground D. Fuse

40. The primary purpose of double insulation is to protect the user from the risk of electric shock . If the first layer insulation fails for any reason, the second layer acts as a backup, preventing any live parts from becoming exposed.

41. One of the basic differences between a fuse and a circuit breaker is that a fuse is a metal piece that melts when there is excess current due to overload, while a circuit breaker has an internal switch that gets tripped when there is excess current in the circuit from an overload or short circuit.

42. Which of the following statements is NOT considered as safety practice in using electrical outlet? A. Overloading outlet with too many appliances. B. Electrical outlets are used away from the water. C. Electrical outlets are free from damages or cracks. D. Electrical outlets have tampered resistant receptacle to protect the children .

43. Which of the following statements is NOT considered as safety practice in using electrical outlet? A. Overloading outlet with too many appliances. B. Electrical outlets are used away from the water. C. Electrical outlets are free from damages or cracks. D. Electrical outlets have tampered resistant receptacle to protect the children .