DIRECTION: Choose the letter
of the best answer.
1.
In which
of the following
units is electrical
consumption measured by electric companies four our household
consumption in our homes?
a. kilowatt c. megawatt
b. volt d.
kilowatt hour
2.
In power stations generating electricity, power is measured in _________.
a. joule c. kilowatt
b. kilojoule d. megawatt
3.
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.
4.
Transformers are used to raise the voltage along substations and lower it for
residential consumption. What kind of transformers is used to raise the voltage?
a. Step-up c. Neither of the two.
b. Step-down d.
Both.
5.
Shayne turned on a lamp switch in her room. Which of the following is the correct
path of electrical power that can be traced back to the source?
a. power plant àtransmission
substations àdistribution
substations àresidences
b. transmission substationsà power plants
àresidences àdistribution
substations
c.
residencesà
distribution substations àpower plantsàtransmission substations
d. distribution substationsàtransmission
substationsàpower
plantsàresidences
6.
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
7.
You made an electric motor in school. When you tested it in using 4 dry cells,
the 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
8.
What energy transformation takes place in a generator?
a. electrical to mechanical c.
mechanical to electrical
b. heat to mechanical d.
chemical to mechanical
9.
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
10.
If a 100 W 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
11.
Last month, Ms. Alcantara’s electric meter reads 8765 kWh. Howmuch will she
payfor power generation if the charge of electric company per kWh is 6.88
pesos
and her electric meter reads 9975 this month?
a. ₱8765.00 c. ₱1210.00
b. ₱8324.80 d. ₱3457.42
12.
Jaypeth paid ₱1250.00
for electric bill.
How much energy
(in kWh) is consumed if the electric company charges ₱6.88/kWh?
a. 186.81 c.
188.61
b. 181.69 d.
181.86
13. In
buying an appliance,
which of the
following efficiency guide
would you consider? Why?
14.
How is the energy efficiency ratio (EEF) related to the operating cost?
a.
the higher the EEF, the higher the operating cost
b.
the higher the EEF, the lower the operating cost
c.
the lower the EEF, the higher the operating cost
d.
the lower the EEF, the lower the operating cost
15.
Gemma wanted to improve the lighting condition of her room by buying a lamp.
What suggestions can you give her and why?
a.
Buy an incandescent bulb because it gives off more light.
b.
Buy a compact fluorescent lamp (CFL) or LED lamp because it is more energy
efficient.
c. Buy a fluorescent lamp because it is brighter
than an incandescent bulb.
d.
Buy an incandescent bulb because it is cheaper.
16.
A 60 watt bulb is connected to 120V plug. What is the current in the lighted
bulb?
a.
0.25 A b.
0.5 A c. 2 A
d. 4 A
17.
To reduce your electric bill
a.
make use of limited appliances
b.
put off appliances when not in use
c. put off main switch during the day
d.
connect appliances in series
18.
What is produced if the magnet and the conductor move relative to each other?
a.
voltage b. magnetic field c.
resistance d. current
19.
When there is a change in the magnetic field in a closed loop of wire,
a.
a voltage is induced in the wire.
b.
current is made to flow in the loop of wire.
c.
electromagnetic induction occurs.
d.
all of these
20.
All of the following power plants use steam to drive the turbines to produce electricity
except
a. hydropower b.
geothermal c. coal-fired d. nuclear
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