1) A motocross rider rested at the top of a hill. After some time, he left his motorcycle on the road as he took pictures of the scenery. If the motorcycle’s mass is 100 kg and the height of the hill is 30 m above sea level, what will be its total mechanical energy? a) 40 J b) 125 J c) 2500 J d) 29400 J 2) How much kinetic energy does a softball, with a mass of 0.15kg, have if it is traveling with a velocity of 40m/s? a) 80 J b) 100 J c) 120 J d) 160 J 3) The melting of the ice cube is a classic example of this law of thermodynamics. Which law of thermodynamics states that energy is conserved? a) Zeroth Law of Thermodynamics b) First Law of Thermodynamics c) Second Law of Thermodynamics d) Third Law of Thermodynamics 4) Can an electric current passing through a heater do work on the heater? a) Only in circuits with high resistance. b) No, electricity cannot do work on a heater. c) Only if the electric current is strong enough. d) Yes, as it could also be used to raise the weight by passing through an electric motor. 5) How is kinetic energy converted to heat energy when a car slows down? a) The driver applies a force that produces heat. b) The brakes create friction, which produces heat. c) The air resistance against the car produces heat. d) The car's rubber tires produce heat as they skid on the road. 6) A mother asks the child to boil some water for their breakfast. What will happen to the temperature of the water if it continues to boil? a) The temperature will start to decrease. b) The temperature continuously increases c) The temperature stays the same while boiling. d) The temperature will increase and decrease from time to time. 7) Work done by a gas is at 500 J in its environment. It is added with 1000 J of heat. What is the internal energy change of the gas? a) 250 J b) 500 J c) 1000 J d) 1500 J 8) One of the stages of electrical power supply is distribution. How much transmitted electrical voltage is reduced from the distribution substation? a) 2,400 - 19, 920 volts b) 13,200 - 24, 000 volts c) 34, 500 - 138, 000 volts d) 138, 765, 000 volts 9) In buying a refrigerator and freezer, which efficiency guide would a buyer consider? a) EEF - 200 b) EEF -300 c) EEF -400 d) EEF -500 10) How is electricity transmitted over long distances? a) Using fiber optic cables. b) Through underground cables. c) The use of wireless communications. d) Transmission lines supported on the tower or underground. 11) What is the purpose of the small transformer at the distribution pole? a) to increase the voltage of the power b) to further reduce the voltage of the power c) to provide a path for the power to the consumer d) to measure the amount of electrical energy used 12) How do power plants tap electricity from this renewable source? a) bathe in hot springs b) drill for fossil fuels c) drill into a steam reservoir d) build nuclear power plants 13) The Helios Solar Power Plant is a 132.5 MW solar power plant in Cadiz, Negros Occidental, Philippines. Why do scientists still try to harness solar energy and turn it into useful energy? a) It is a renewable resource that cannot be depleted when used. b) It is natural and, therefore, cheaper than the traditional utility. c) It is efficient, as none of the sun's energy is lost when solar cells are utilized. d) It is non-radiant with particles that resist vibration, making it relatively easy to procure. 14) Last month, the family’s electric meter reads 5760kWh. How much will they pay for power generation if the charge of the electric company per kWh is P 9.87, and the electric meter reads 6980 kWh? a) ₱ 12,041.40 b) ₱ 14,200.81 c) ₱ 87,600.00 d) ₱ 99,800.00 15) How is the voltage of the power reduced to a suitable level for distribution at the distribution substation? a) using longer transmission lines b) increasing the size of the transformer c) decreasing the voltage to a higher level d) stepping down the voltage with smaller transformers 16) A bullet with a velocity of 1000 m/s is fired horizontally at a height of 2.5 meters. Think there is no air resistance. How much time will it take for the bullet to hit the ground? (Use the formula of time that is t=√(2dy÷ag) ) a) 0.1 s b) 0.71 s c) 1.5 s d) 2.75 s 17) A boy throws a ball horizontally from the top of a building. The ball hits the ground 10 seconds later and lands 200 meters from the base of the building. How fast did the boy throw the ball? (Note that Vi = dx ÷ t) a) 10 m/s b) 20 m/s c) 200 m/s d) 2000 m/s 18) A huge boulder with an initial velocity of zero is dropped from a bridge above a river. After 5 s, the boulder strikes the water below the bridge. Approximately how fast is the boulder traveling when it strikes the water? (Note that acceleration due to gravity = 9.8 m/s or ≈ 10 m/s per 1 second) a) 30 m/s b) 50 m/s c) 70 m/s d) 90 m/s 19) A soccer ball is kicked at a 45-degree angle to the horizontal with an initial velocity of 30 m/s. Find out the maximum height of the soccerball. (Note that the formula is dymax=(〖vi〗^2 〖sinθ〗^2)/2g). a) 12.00 m b) 22.96 m c) 35.22 m d) 46.0 m 20) A 5.0-kilogram bowling ball is rolling at 3.0 m/s. What is its momentum? (Note that p = mv) a) 1.67 kg m/s b) 5.67 kg m/s c) 10 kg m/s d) 15 kg m/s

PART 2. Q4-G9-REVIEWER

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