test questions

1. 1
Masbate City Division
MASBATE NATIONAL COMPREHENSIVE HIGH SCHOOL
Quezon St., Masbate City
NAME:______________________________ SECTION:___________ DATE:________ Total Score:____
Direction: Write the CAPITAL letter of the correct answer on the space provided for.
Knowledge:
For questions 1-5, consider the given situation.
Maria throws a ball straight up with an initial velocity of 10m/s. See figure on the right.
_______1. What is its velocity at the highest point?
_______2. What is its velocity when it returned to the elevation from where it was thrown?
_______3. What is its acceleration at the highest point?
_______4. What is its acceleration just before it hits the ground?
_______5. After 1 second, what is the acceleration of the ball?
a. 0 m/s
b. 0 m/s 2
c. 9.8 m/s2
d. – 9. 8 m/s2
e. 10 m/s2
f. 10 m/s
g. Cannot be determined
_______6. Work done = Force x _______
a.distance b. acceleration c. velocity d. speed
_______7. Which form of energy does the flowing water possess?
a.gravitational potential energy c. electrical energy
b.potential energy d. kinetic energy
________8. The P.E. of a body at a certain height is 200 J. The kinetic energy possessed by it when
it just touches the surface of the earth is__________
a. > P.E b. < P.E. c. = P.E d. no P.E.
________9. Who among the following scientists discovered the relationship between electricity and
magnetism?
a. Andrei Marie Ampere c. Hans Christian Oersted
b. Michael Faraday d. Alessandro Volta
________10. In which of the following units is electrical consumption measured by electric companies
for our household consumption in our homes?
a. Kilowatt b. Volt c. Megawatt d. Kilowatt Hour
________11. Transformers are used to raise the voltage along substations and lower it for residential
consumption. What kind of transformer is used to raise the voltage?
a. Step-up b. Step-down c. Neither d. Both
Process:
________12. The S.I. unit of force is
a. Erg b. Joule c. Newton d. Dyne
________13. A passenger in a moving train tosses a coin which falls behind him. It means that the
motion of the train is:
a. accelerated b. uniform c. along a circular track d. all of these
________14. A body of mass 20 kg moves with an acceleration of 2 m/s2. The rate of change of
momentum in SI unit is:
a. 40 b. 10 c. 4 d. 1
________15. The net force acting on a body of mass 1 kg acting with a uniform velocity of 5 m/s is
a. 5 N b. 0.5 N c. 0 N d. none of these
________16. When a constant force is applied on a body, it moves with constant______________.
a. Speed b. Velocity c. Momentum d. Acceleration
________17. When an object undergoes acceleration
a. Its speed always increases c. it always falls towards the earth
b. Its velocity always increases d. a force must be acting on it
________18. If an object speeds up from 20m/s to 100m/s in 4s, what is its acceleration?
a.20 m/s2 b. 25 m/s2 c. 200m/s2 d. 30 m/s2
________19. A and B are two objects with masses 100 kg and 75 kg respectively, then ________
a. both will have the same inertiac. A will have more inertia
b. will have more inertia d. both will have less inertia
K:_____
P:_____
U:_____

2. 2
________20. In power stations generating electricity, power is measured in__________________
a. Joule b. Kilojoule c. Kilowatt d. Megawatt
________21. What energy transformation takes place in a generator?
a. electrical to mechanical c. mechanical to electrical
b. heat to mechanical d. chemical to mechanical
________22. If a 100W light bulb is lit for 8 hours each day for 20 days in a month, how many
kilowatt-hours will the bulb consume?
a. 16 b. 160 c. 1600 d. 16000
________23. A heat engine absorbs 1000kJ of heat and releases 350k into the cold reservoir. What
is the efficiency of the heat engine?
a. 35% b. 50% c. 65% d. 285%
________24. A heat engine with an efficiency of 30.0% performs 2500J of work. How much heat is
discharged to the lower temperature reservoir?
a. 5749 J b. 5833 J c. 11499 J d. cannot be determined
________25. A heat pump that uses an underground water reservoir as a heat source extracts 2.1 x
105 J each cycle, while requiring 3.0 x 104 J of work to do so. How much heat is
delivered to the inside of the house?
a. 2.4 x 103 J b. 2.4 x 104 J c. 2.4 x 105 J d. 2.4 x 106 J.
________26. In a geothermal power plant, what role does the natural heat of the Earth have in the
production of electrical energy?
a. It is directly converted into electrical energy by means of a converter.
b. It moves turbines attached to generators thus producing electricity.
c. It creates a force that moves generators to produce electricity.
d. It boils water into steam which turns turbines attached to generators that produce
electrical energy.
________27. A step-up transformer can be found in all wind turbines. Why should there be step-up
transformers right below the wind turbines?
a. The electricity produced is stored in these transformers for later use.
c. The voltage of the electricity generated by turbines has to be increased so that it can
travel to transmission lines and not be dissipated along the way.
d. The current of the electricity generated by the turbines has to be increased so that it
can travel to transmission lines and not be dissipated along the way.
e. These transformers simply store the electricity and then transfer it to another station
________28. In which of the following units is electrical consumption measured by
electric companies for our household consumption in our homes?
a. kilowatt c. megawatt
b. volt d. kilowatt hour
________29. In power stations generating electricity, power is measured in _________.
a. joule c. kilowatt
b. kilojoule d. megawatt
Understanding:
________30. A sepak takraw that is kicked from a height of 2 meters follows a path that is a ______.
a. Circular b. Linear c. hyperbolic d. parabolic
________31. When a force of 1N acts on a mass of 1kg that is free to move, the object moves with
a. a speed of 1 m/s c. an acceleration 10 m/s2
b. a speed of 1 km/s d. an acceleration of 1 m/s2
________32. The physical quantity, which is equal to rate of change of momentum, is
a. Displacement b. Acceleration c. Force d. Impulse
________33. The gravitational force of earth acting on a body of mass 1 kg is _______.
a. 8.9 N b. 9.8 N c. 980 N d. 1 N
________34. The momentum of a toy bus of 0.01 kg moving with a velocity of 5 m/s is
a. 0.005 kg m/s b. 0.05 kg m/s c. 0.005 N s d. 0.5 kg m/s
________35. What is the momentum of a man of mass 100 kg when he walks with a uniform velocity
of 2 m/s?
a. 200 kg m/s b. 200N c. 250 kg m/sd. 50 kg m/s
________36. Momentum of a massive object at rest is _______.
a. Very large b. Very small c. Zero d. None of these
________37. When collision between the bodies in a system is inelastic in nature then for the system,
a. Momentum changes but KE remain conserved
b. KE changes but momentum remain conserved
c. Both momentum and KE changes

3. 3
d. Both momentum and KE remain conserved
________38. Why would a power plant operate more efficiently at the North Pole than at the
Equator? Assume the power plant burns fossil fuel, and the fuel always is burned at the
same temperature, regardless of location.
a. Lubricants would not be easily diminished in that region owing to a colder
temperature.
b. There is less friction in the North Pole owing to the fact that there is more ice in that
region of the Earth.
c. There is an abundant source of fossil fuels in the North Pole which are stored right
under the frozen land mass.
d. The outside temperature is much lower than the input temperature thus TC/TH will be
much lower making the efficiency higher.
________39. Why do power stations generate AC and not DC?
a. It is easier to generate, safer and more economical to transmit AC than DC.
b. Transformers work with AC
c. AC is used in mobile devices and gadgets.
d. AC is more efficient and economical.
________40. What is the energy of a motorcycle moving slowly at the top of a hill?
a. entirely kinetic c. entirely potential
b. entirely gravitational d. both kinetic and potential
________41.Which form of energy does the flowing water possess?
a. gravitational b. potential c. kinetic d. electrical
________42. A power plant has been proposed that would make use of the temperature gradient in
the ocean. The system is to operate between 20°C (surface water temperature) and 5°C
(water temperature at a depth of about 1km). This plant works with an efficiency of
5.1% while producing 75MW of power. What compensating factor would make this
proposal of interest despite its low efficiency?
a. It produces a lot of energy. c. The maintenance cost is not so high.
b. The temperature difference is small. d. There is a lot of seawater
________43. Which of the following is the correct diagram of how a heat engine works?
a. b.
c. d.
________44. How are gasoline engines and steam turbines similar?
a. Both of these machines use work to transfer heat from a cold region to a hot region.
b. Both of these machines are perfectly efficient and are able to do their function.
c. Both of these machines use heat in order to do mechanical work.
d. Neither of these two operate at high temperatures which make them highly efficient.
________45. In the Agus VI Hydroelectric Power Plant, which energy transformation takes place?
a. electrical  mechanical  electrical
b. gravitational  potential kinetic  electrical
c. heat  mechanical  electrical
d. nuclear  heat  electrical
________46. You made an electric motor in school. When you tested it in using 4 dry cells, the
QHOT
ENGINE WORK
QCOLD
WORK
ENGINE
QHOT
QCOLD
QCOLD
ENGINE
QHOT
ENGINE
QHOT
QCOLD

4. 4
armature turned very fast. What should you do to make it turn slower?
a. use a bigger magnet
b. remove one of the dry cells
c. increase the number of turns in the coil of wire
d. decrease the distance between the magnetic poles
________47. How does a geothermal power plant utilize the natural heat coming from underneath the
Earth?
a. The heat from the earth is used by a turbine to create electricity.
b. The heat from the earth is directly converted to electricity by means of an inverter.
c. The heat from the earth is funneled into distribution pipes that is used to power
electrical appliances.
d. The heat from the earth boils water in a tank. When water turns to steam it rotates
the blades of a turbine. The turbine converts mechanical energy to electricity
________48. What function does the transformer near your house do?
a. It increases the voltage carried by the electricity that is suited for our home.
a. It increases the current carried by the electricity to suit the needs of our home.
b. It is a step down transformer that decreases the current to suit the needs of our
home.
c. It is a step down transformer that decreases the voltage to suit our home.
________49. Transformers are used to raise the voltage along substations and lower it for residential
consumption. What kind of transformer is used to raise the voltage?
a. Step-up b. Step-down c. Neither d. Both
_________50. In which case will electric current be induced in a coil of wire?
a. when it is connected to a galvanometer
b. when a magnet is held stationary inside the coil
c. when a magnet is rapidly inserted into and out of the coil
d. when a magnetic compass is held beside it
Preparedby:
Grade 9 Science Teachers
ovbc.sci.14_15