UNIT TEST IN SCIENCE UNIT TEST IN SCIENCE

UNIT TEST.

1. 4 th UNIT TEST SCIENCE 9

2. MULTIPLE CHOICE . Directions: Read and understand the question carefully. Write the letter of the best answer.

3. 1) A sepak takraw that is kicked from a height of two meters follows a path that is____________. A. circular B. linear C. hyperbolic D. parabolic

4. 2 ) What happens to the horizontal velocity of an object as it travels through the air? A. changes continuously B. gradually decreasing C. gradually increasing D. remains the same

5. 3) If you throw a baseball straight up, what is its vertical velocity at the highest point? A. 0 m/s B. 0 m/s² C. 9.8 m/s D. -9.8m/s²

6. 4) What force enables objects to reach the ground? A. Frictional Force B. Magnetic Force C. Gravitational Force D. Tension Force

7. 5 ) 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? A. Charges continually B. Gradually decreasing C. Gradually increasing D. Remains the same

8. 6) Which of the following describes momentum? A. Mass times its velocity B. Force times the time interval C. Force times its acceleration D. Mass times its acceleration

9. 7) Which of these is the quantity of matter in an object? A. force B. mass C. motion D. time

10. For questions 8 and 9 , refer to the table below: Vehicle Mass (kg) Velocity(m/s) Jeepney 2000 10 Motorcycle 300 20 8) In the table above, what is the momentum of the jeepney? A. 200 kg-m/s C. 20,000 kg-m/s B. 2 ,000 kg-m/s D. 3,000 kg-m/s 9 ) Which has greater momentum, the jeepney or the motor cycle? A. jeepney C. both have the same momentum B. motorcycle D. cannot be determined

11. 10) Two billiard balls approach each other at equal speed. If they collide in a perfectly elastic collision, what would be their velocities after collision? A. zero B. same in magnitude and direction C. same in magnitude but opposite in direction D. different in magnitude and opposite in direction

12. 11) What is the unit for momentum? A. kgm /s B. Nkg C. kg m/s² D. Nm/s

13. 12) Mechanical energy is defined as the sum of both the potential energy and the kinetic energy of an object. According to the law of conservation of energy, what happens to mechanical energy if the potential energy of an object decreases? A. mechanical energy increases B. mechanical energy decreases C. mechanical energy increases then decreases D. mechanical energy remains unchanged

14. 13) Which best describes potential energy? A. Energy of motion B. Energy as heat C. Stored energy D. Energy that is doing work

15. 14) What is the energy of a motorcycle moving down the hill? A. entirely kinetic B. entirely potential C. entirely gravitational D. both kinetic and potential

16. 15) Which of the following are two types of Mechanical Energy? (ME) A. Kinetic and Potential Energy B. Kinetic and Nuclear Energy C. Potential and Chemical Energy D. Thermal and Kinetic Energy

17. 16) Which example best represents kinetic energy? A. stretched rubber band B. glass of milk C. a computer D. a flying kite

18. 17) What is a measure of how hot or cold an object is compared to a reference point? A. Conductor B. Temperature C. Thermodynamics D. Thermometer

19. 18) Which represents the SI unit for work? A. Calorie B. Joule C. Newton D. Watts 

20. 19) How does heat and work affect a system? A. heat and work both contribute to the total internal energy of a system B. heat and work do not affect to the total internal energy of a system C. without heat and work, there will be no internal energy of the system D. heat and work affects the system in a negligible impact

21. 20) Which of the following is an example of work converted into heat? A. heat engine B. hand rubbing C. gas stove D. hot air balloon

22. 21) Which of the following is not correct? A. Heat and work are related. B. Heat is a form of energy. C. Heat cannot be completely converted into work. D. Work is measured in Joules

23. 22) 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? A. Internal energy is zero. B. The amount of heat is equal to the work done. C. Both A and B D. Work done is greater than the heat added.

24. 23) When the work is done upon the object, that object gains energy. What type of energy is acquired by the objects upon which work is done? A. electrical energy B. heat energy C. mechanical energy D. work energy

25. 24) What energy transformation takes place in a generator? A. chemical to electrical B. electrical to mechanical C. heat to mechanical D. mechanical to electrical

26. 25) w hat do you call a facility that produces electricity from energy sources? a. generator b. national grid c. power plant d. transformer

27. 26) Where does geothermal energy come from? A. wind B. rivers C. sunlight D. heat from the earth

28. 27) What does it mean when we say that geothermal energy is “sustainable”? A. That it generates greenhouse gases. B. That it will not be used up. C. That there is a limited supply. D. That it can be used anywhere on earth.

29. 28) What potential environmental issue can occur when building a geothermal energy plant? A. The burning of fossil fuels B. Water pollution from the chemicals. C. Toxic gases can be released when drilling D. All of the above

30. 29) Geothermal power plants can generate ________ by using hot water and steam from deep in the earth. A. air conditioning B. greenhouse gases C. electricity D. hydropower

31. 30) According to International Geothermal Association (IGA), worldwide, the Philippines ranks ___________ to the United States of America in producing Geothermal Energy. A. First B. Second C. Third D. Fourth