Science 2nd Quarter
Monthly electricity bills are based on kilowatt-hours (kWh), or the energy consumed in one hour at a rate of 1000 W. How many kWh are garnered in turning a 45 W lamp on for 6 hours?
0.27 kWh
Two identical bulbs are connected in series with a 120 V source. If each bulb has a resistance of 90 Ω, how much is the current flowing in each of it?
0.67 A
A light bulb with a resistance of 80 Ω is connected to a 120 V source. What is the current flowing through the light bulb?
1.5 A
Solve the amount of heat required to raise the temperature of a 300 g salt from 30˚C to 70˚C. The specific heat of salt is 0.879 J/(g∙oC).
10 548 J
What is the power consumed by a light bulb drawing a 2 A current from a 50 V source?
100 W
A 250 mL of lemonade contains 3000 cal of energy. How much energy in joules is consumed if you drink a 250 mL of lemonade?
12 552 J
A home air conditioner has a power rating of 3500 W. How much is the cost of turning the air conditioner for 5 hours if 1 kWh costs 7.50 pesos?
131.25 pesos
An coffee maker with a power rating of 787.5 W draws a 7.5 A of current from its source. How much is the resistance of the coffee maker?
14.00
You are tasked to find the mass of a marble heated with 23.5kJ of heat. In the heating process, the temperature was increased by 175oC. Calculate for the mass of the marble, if its specific heat is 0.879J(g∙oC).
152.77 g
The temperature of a 600g lead sample was increased by consuming a 10920J of heat. If the initial temperature of the lead was 15oC, find its final temperature. The specific heat of lead is 0.130J(g∙oC).
155 C
In one month, you incurred a meter reading of 220 kWh. How much if 1 kWh costs 7.25 pesos?
1595 pesos
How many typhoons, on average, hit the Philippines in a year?
20
A heater has a resistance of 11 Ω. What is the amount of current the heater draws if it is connected to a 220 V source?
20 A
An electric iron is plugged in a wall outlet that supplies a voltage of 210 V. If the current is 1.05 A, find the resistance of the electric iron
200 Ohms
What is the magnitude of the speed of light in a vacuum?
3.0 x 10 8 m/s
An orange light propagates at a frequency of 490 THz. How much energy does this orange light carry?
3.25 x 10 -21 J
A certain electromagnetic wave has a frequency of 5 x 10−19 Hz. How much energy does the wave carry?
3.3 x 10 -29 J
How much is the cost of turning a 30 W incandescent light bulb for a week, if 1 kWh costs 6.00 pesos?
30.24 pesos
Heat is measured in joules but it can also be defined in calories. How many calories are there in 150 J of heat?
35.85 cal
When you eat a 100 g of chocolate cake, you'll absorb an energy equivalent to 1 535 528 J. What is the calorie rating of a 100 g chocolate cake?
367 kcal
In the visible light spectrum, the range for the wavelength of the color green is from 480 - 560 nm. What is the frequency range for green?
5.36 x 10 14 - 6.25 x 10 14 Hz
Which of the following is the voltage across a circuit with a resistance of 100 Ω and a current of 0.5 A?
50 V
A low calorie food has a rating of 1.5 kcal. How much energy in joules will you absorb if upon eating the food?
6 276 J
X-rays are EM waves that have high frequencies which is used in scanning bones. What is the wavelength of an X-ray that propagates with a frequency of 4.6 x 10 18 Hz?
6.5 x 10 -11 m
At what frequency does a light propagate if it carries an energy of 4.5 x 10−19 J?
6.8 x 10 14 Hz
An electric heater has a resistance of 0.15 Ω. What is the power consumed by the heater if it draws a current of 20 A?
60 W
A 1.1kg copper was heated until it reached a temperature of 200oC. If its original temperature was 25oC, how much heat was required in heating the iron? The specific heat of copper is 0,390 j / g c
75 075
How much heat is required in melting a 2kg block of ice, until it reaches a temperature of 20oC? The specific heat of ice is 2.1J(g∙oC). The freezing point of water is 0oC. Select your answer.
84 000 J
A study of colorblindness was done on four different persons - 2 colorblind, and 2 with normal eyesight. The data relating to the number of rods and cones is summarized in the table.
A decrease in the number of cones lead to colorblindness
A forecast warns Locality X of a typhoon which will hit the area in the next 2 hours. Storm warning signal in the locality is raised to 2. What should the people expect?
A storm warning signal of 2 means that the intensities of winds and rain are capable of causing light to moderate damage to properties.
Which of the following statements about the relationship of wave energy and frequency is true?
A wave with a higher frequency has more energy
Which of the following should be done before a typhoon strikes?
All the choices except staying away from flood water are recommended to be done before typhoons.
Why can the devices connected in a parallel circuit function independently?
Because the current flowing is different for each device
In December 2004, Indonesia suffered a magnitude 9.3 earthquake. It is recorded as the third-largest ever recorded earthquake in a seismograph. What best describes a magnitude 9.3 earthquake?
Buildings are severely damaged
How does moving to landmasses weaken typhoons?
By moving landward, typhoon moves away from its source of fuel
In which of the following places or oceans do most typhoons form?
Caribbean
Which of the following statements is true?
Different materials warm up and cool off at different rates
Which of the following is false?
Dispersed light will only show red, orange, yellow, green, blue and violet colors
What are waves that do not need a medium to propagate?
Electromagnetic waves
What of the following should be done in case of threats of storm surge?
Evacuate in areas 500 meters away from the bay
The product of wavelength and frequency is a constant.
False
Wavelength and frequency are directly proportional
False
How are faults generally described?
Faults are generally described as breaks in the crust of Earth where slippage occurred.
Which of the following statements are true about faults?
Faults do not cause earthquakes. They are the locations where earthquakes happen as they are the breaks in rocks resulting from the movement of tectonic plates. Faults do not make the ground move.
Which of the following types of map will be most helpful during typhoon season?
Flood hazard map
The electromagnetic waves in the electromagnetic spectrum is characterized by which varying property?
Frequency
Which of the following statements is false about EM waves?
Gamma rays have the highest frequency and therefore, travels the fastest.
In a home kitchen setting, which of the following can be the most dangerous falling hazard?
Hanging pots and pans, especially knives, can pose very serious threats in times of earthquake activity.
Which of the following best describes hanging walls in dip-slip faults?
Hanging walls always immediately lie above the faults
Which of the following is the mathematical expression of Ohm's law?
I = v / r
An earthquake occurred and is reported to have destroyed few poorly built structures. In addition, people had a hard time standing. What is the intensity of the earthquake based modified Mercalli intensity scale?
Intensitivity VII
What happens to light as it passes through a transparent material?
It bends
Why would a cube of ice melt faster in a hot metal pan than in our hands?
It is because the temperature difference between the pan and the ice is greater than the temperature difference between our hands and the ice
Which of the following is true about a tropical cyclone?
It spins clockwise in the southern hemisphere and counter clockwise in the north
What is the unit for specific heat?
J / g C
When a strong earthquake occurs, what type of waves are recorded by the seismograph?
Large waves are recorded
Which of the following is true about latitude and longitude?
Latitude represents north-south value of a point while longitude is the east-west value
The S wave's velocity is higher at layer A. Its velocity slows down and approaches to zero as it reaches layer B. What can be inferred about the layers
Layer A is rigid while B is fluid
What happens to light in the formation of a rainbow?
Light gets refracted as it enters a water droplet, then reflected back as it hits the opposite end, then gets refracted back into the air
Which of the following will happen when light passes through a prism?
Light will be dispersed into band of colors
Current flows very easily in metals, but is restricted in plastics. What does this tell us regarding the relative resistances among metals and plastics?
Metals have lower resistances compared to plastics
Which of the following is true about tropical cyclones in eastern Asia and western Australia?
More typhoons occur in eastern Asia than in Western Australia
An exposed cut in the soil layers reveals two diagonal lines on the ground that resemble two sides of a triangle. Displacements with the layers were observed too. Which of the following is the likeliest scenario?
Multiple breaks in the soil layers that show slippage indicate the existence of more than one fault in the area.
Using the map below, in which of the following areas would a tropical cyclone hit if it forms over the Atlantic Ocean?
New Orleans
If the speed of light does not change as it enters a water droplet, will a rainbow still form?
No, because light needs to be refracted to separate light into its component colors
Just few minutes after intense rainfall and winds, Lafayette noticed calmness. He concluded that the typhoon is over. Is his conclusion correct? Why?
No, the calmness may just be a result of the eye passing the area
A typhoon, which made its landfall at Locality A and has weakened, now moves towards an ocean onto Locality B. The officials at Locality B told the people not to worry as the typhoon will not bring intense winds and rain. Is the statement of the officials correct?
No. The typhoon my regain strength if the ocean is warm and moist
What law states that the current flowing through a circuit is directly proportional to the voltage, and inversely proportional to the resistance?
Ohm's law
What is the unit for resistance?
Ohms (Ω)
Power is defined as the product of current and voltage. Which of the following equations provide a similar expression for power?
P = I2R
What type of body wave can travel through solids, liquids, and gases?
P wave
Which of the following waves can travel at significant speeds through the outer core?
P waves
Which of the following countries is/are located along path of tropical cyclone that form in the West Pacific ocean?
PH
Which type of circuit refers to the type of connection wherein there are more than one path for the current to take?
Parallel circuit
What does PAR in weather forecasting in the Philippines stand for?
Philippine Area of Responsibility
What does the acronym PAGASA stand for?
Philippine Atmospheric, Geophysical, and Astronomical Services Administration.
Jeff is constructing a traffic-light sensing robot. You have programmed it to stop when it sees the color red and to move when it sees the color green. Which pair of wavelengths would make the robot stop and go, respectively?
Red wavelengths range from 630-700 nm. Green ranges from 480-560 nm. Wavelengths in those ranges would make the robot stop and go.
How can seismic waves be used in oil exploration?
Seismic wave's velocity changes as passes through different rock layers which may house oil deposits.
What refers to the phenomenon where water piles up along coastlines during typhoons?
Storm surge
Which is true about Coriolis force and typhoons in the west Pacific?
Strength of Coriolis force is enough for typhoons to form in west Pacific
You are tasked to open a bottle with a metal lid that is impossibly tight. Which of the following will easily help you in your task?
Submerge the bottle in hot water
A magnitude 6.7 earthquake hit Surigao in February 2017. In which of the following faults might have moved and generated the earthquake?
Surigao segment of PHilippine Fault
Which of the following statements is true regarding the current in a circuit?
The current comes from the flow of electrons within the connecting wires
If the resistance in a circuit is kept constant, what will happen to the current if the voltage increases?
The current increases
In an electric current that is provided with a constant voltage source, how are the current and resistance related?
The current is inversely related to the resistance
If the resistance in a circuit is doubled, by how much factor does the current change? Assume that the voltage remains the same.
The current is reduced by half
A car with a tank filled with gasoline is parked under the scorching heat of the sun. Which of the following would explain a gasoline spill, considering that both the tank and the gasoline should expand?
The gasoline expanded at a rate faster than the tank
The sensation of warmth in an object given by the average kinetic energies of its molecules. If an object is being warmed, what happens to the velocities of its molecules?
The molecules move with increased velocities
What is the requirement for heat to flow among objects in thermal contact?
The objects must have different temperatures
What is the primary requirement for charges to flow from one object to another?
The objects must have different voltages.
What happens to a typhoon as it takes its landfall on a city?
The typhoon weakens
Which statement regarding a parallel circuit is true?
The voltage across each device in a parallel circuit is the same.
Why do plants appear green?
They absorb all colors except for green, or chlorophyll.
Which of the following refers to a wind system that circulates around a low pressure center?
Tropical cyclone
Which of the following refers to a tropical cyclone that has maximum wind speed of 62 to 88 kph?
Tropical storm
The frequency of an EM wave can be calculated once the wavelength is known.
True
The wavelength of an EM wave can be calculated once the frequency is known
True
Which of the following is not true about typhoons in the Philippines?
Typhoons in the country are fueled by west Pacific Ocean
Which of the following is true?
Violet has the greatest energy among colors
Which region/s in the electromagnetic spectrum are humans able to detect using one's senses?
Visible light
Which of the following EM wave frequencies are visible to humans?
Visible light ranges from 4.3 x 10^14 to 7.5 x 10^14 Hz.
In general, objects with higher specific heats would require longer amount time to warm up. If an iron warms faster than water, what does this say about their relative specific heats?
Water has a higher specific heat than iron. As such, water heats slower compared to iron.
Arrange the following EM waves in decreasing magnitude of wavelength.
Wavelength is inversely proportional to frequency. The higher the frequency, the lower the wavelength. Radio waves have the longest wavelength (lowest frequency), while gamma rays have the shortest wavelengths (highest frequency).
Why does a bird remain unharmed when resting on a high voltage wire?
When there is no voltage difference, current will not flow
Which of the following statements about EM waves is true?
While EM waves cover a wide range of frequencies, they all travel at the same speed. This is true, in a vacuum.
A new company is selling an X-ray machine. As the machine was turned on during a demo, a blue light shone through. The company representative said that the blue light is the X-ray. What can you conclude about the new X-ray machine?
X-rays have very high frequencies, well above the frequencies of visible light. X-rays are NOT visible to the human eye. Finish quiz
Which of the following statements explains the purpose of grounding?
a counter measure to prevent electric shock
How are typhoons in the Philippines named?
according to sequence of the local alphabets
Which of the following colors are present when light disperses?
all colors are present when light disperses
Which quantity really defines the danger, voltage or amperage?
amperage
What is the unit for current?
amperes
The speed of light is achieved when
an EM wave travels in a vacuum
Which of the following is NOT a phenomenon that illustrates dispersion?
apparent bending of pencil in water
Where is the hypocenter of an earthquake located?
below the surface, on the fault
A wavelength of 450 nm would correspond to what color?
blue
Which of the following correctly describes P and S waves?
both can travel through earth's interior, both are body waves
Which equation relates the wavelength and frequency of an electromagnetic wave?
c = wavelength f
What method of heat transfer involves the collision of molecules within a substance?
conduction
What type of materials can allow charges flow easily?
conductors
Which part of a circuit provides the pathway wherein the current will flow?
connecting wires
In what manner of heat transfer is the water in a kettle on a stove heated?
convection
The mechanism of a hot air balloon involves a heater that is used to warm the surrounding air. What method of heat transfer does the heater use to warm the air inside a hot air balloon?
convection
What is the outermost layer of Earth?
crust
Which quantity defines the flow of charge?
current
A tropical cyclone above Arabian sea has gained enough strength and was given a local name in the nearby region. Which of the following might be the name of the said tropical cyclone?
cyclonic storm Sookie
Which of the following is true about the Philippine Area of Responsibility?
designated area where PAGASA is tasked to monitor the occurrence of tropical cyclones.
It is the reflection of light in many directions.
diffuse reflection
What do you call the phenomenon when light separates into different colors?
dispersion
Which of the following provide another measure to counter electric shock?
double insulation
Which countries would a typhoon formed in the west Pacific and with a recurving path head into?
east of China, Taiwan, Japan, and Korea.
What do we call the energy associated to a charge's location?
electric potential energy
Which among the following is not an essential item in an emergency kit?
extra pair of shoes
What refers to the area in a tropical cyclone that has lowest central air pressure?
eye
In a tropical cyclone, what is the area where most intense winds form?
eyewall
What is the function of fuse in a circuit?
fuses are used to prevent overloading
In a series of normal faults, what do you call the portion that is down-dropped?
graben
What does the Japanese word tsunami literally translate into?
harbor waves
Which refers to the energy in transit between objects that are in thermal contact?
heat
Which among the following is the best place to seek shelter during a tsunami alert?
hills or mountains
Where would light travel fastest?
hot air
A fault has not moved for over 10 000 years and has been covered with a layer of new material on top. How do you classify this fault?
inactive fault
Which of the following is the best place to live in considering earthquake safety?
inlands, far from shorelines
Which medium cannot be penetrated by S wave?
inside a vacuum
What type of materials can restrict flow of charges?
insulators
What is the overall sum of energies within an object?
internal energy
Which of the following statements best describes the current rating of a fuse?
it indicates the maximum current allowed to flow in the circuit
What is the unit for power?
joule/second
What is the first step to surviving an earthquake?
keeping calm
In the molecular level, the molecules in all substances are always in motion. What type of energy arises from this motion of molecules?
kinetic energy
What does horizontal lines in a map, parallel to the equator, represent?
latitude
Which term refers to any device powered by a circuit?
load
What happens to the magnitude of an earthquake if measured from very far distances from where the earthquake has occurred?
magnitude remains the same
Which of the following causes an earthquake?
movement of tectonic plates
Which of the following can cause earthquakes.
moving tectonic plates
If a strike-slip fault located in the middle of the ocean generated an earthquake with a magnitude of 2.0 on the Richter scale, which of the following is most likely to happen?
no tsunami will form
A typhoon was seen to moving north of its origin for the past 12-hour tracking. Which of the following paths is the typhoon taking?
northward
Where would you not expect a fault?
on ice shelves
Where is the fault most likely located in an area struck by a tsunami?
on the sea floor
Which medium cannot be penetrated by S waves?
open waters
Which areas in the map should a tropical cyclone, which originated in the red area, move towards to prevent weakening?
other red areas
What do we call the event wherein the current flowing through a circuit exceeds the current capacity of the wires?
overloading
Which of the following refers to the rate at which electrical energy is delivered to the circuit?
power
Which of the following is true about public storm warning signals set by PAGASA?
put in effect prior to the onset of the meteorological condition.
By which method of heat transfer does the sun warm our planet?
radiation
What method of heat transfer requires the use of electromagnetic waves?
radiation
Issa is trying to shine a laser through a mirror at the end of the room to catch Ina's attention. Issa angled herself so that the angle at which the laser light bounces off the mirror is at the same angle to hit Ina. What kind of phenomenon is exhibited here?
reflection
Which of the following quantities restricts the movement of charges?
resistance
What do we call a device that is used to reduce the current flow in a circuit?
resistor
Which of the following may indicate an incoming tsunami?
retreat of seawater before huge tsunami waves arrive.
What kind of fault is most likely present in areas where two tectonic plates collide with each other?
reverse fault
What kind of fault is responsible for generating most tsunamis?
reverse fault
What instrument measures and records ground vibrations which may indicate the occurrence of earthquakes?
seismograph
In which type of circuit connection does the current take a single pathway?
series circuit
A weather report on the radio stated that a low pressure area with maximum speed of 111 kph is seen west of your region. Using PHIVOLC's classification, how should the tropical cyclone be called?
severe tropical storm
An earthquake is felt at a location that is close to the epicenter. What would most likely happen to the buildings if the magnitude of the earthquake measures 8.0 on the Richter scale?
severely damaged
Which refers to the condition wherein the path of the current in a circuit is shortened, resulting to a decrease in the overall resistance of the circuit?
short circuit
A typhoon is expected to hit Locality A. Its winds speed is expected to be up to 160 kph. What storm signal fits the typhoon?
signal number 3
What is the speed of a tsunami generated from the shoreline relative to the average speed as it leaves the bay further away from the shore?
slower
What type of surface reflects light well?
smooth, shiny and polished materials
Which quantity defines the amount of heat required to change the temperature of a unit mass by one degree?
specific heat
Which of the following paths is described as westbound, heading towards Philippines and Taiwan?
straight path
Which type of seismic wave can only penetrate at shallow depths?
surface wave
Which part of a circuit can either allow or cut off the flow of current?
switch
What term is used to quantify how warm or cold an object is?
temperature
What will probably happen to a bird resting on a high voltage wire if it reaches another wire nearby?
the birds will probably get electrocuted.
Cracks appeared in the walls of your house after an earthquake. Other neighboring houses do not have cracks on their walls. No ground rupture was seen. What is the best explanation for this?
the earthquake's hypocenter is directly below your house
Which of the following is true about normal faults?
the hanging wall slides down footwall
The voltage in a circuit is doubled. By how much factor should the resistance change, such that the same amount of current flows through the circuit?
the resistance should also be doubled.
What happens to the total current in a parallel circuit if more devices are added?
the total current increases
In a series circuit, what happens to the overall resistance as more devices are connected?
the total resistance increases
What happens to the volume of a material when it is heated?
the volume expands
What happens to the flow of current when one of the devices in a series circuit malfunctions?
the whole circuit stops.
Which of the following devices is driven by the concept of expansion?
thermometer
Why is it better to store canned food in the emergency kit instead of fresh meals?
they do not easily rot
Scientists believe that other terrestrial planets have the same internal layers as Earth's. Which of the following did they use, together with others, to come up with the idea?
through their densities and composition of other bodies in the solar system
In 2015, a magnitude 8.3 earthquake in Chile generated a tsunami that was observed in the Pacific regions. Which among the following faults and plates might have been responsible for the tsunami?
thrust faulting between Nazca and South America plates
In constructing bridges and railways, small gaps are often left on the joins of the structures. Why are these gaps important?
to accommodate expansion and contraction
Why is it necessary to know where the nearest faults in your area lie?
to be able to plan where is it safest to live in. To be able to plan safe escape routes
Why are circuit breakers connected in series with the power supply?
to cut off the entire current in the circuit.
Which of the following is a correct arrangement of tropical cyclone with increasing wind speed?
tropical depression to tropical storm to typhoon
What do you call a giant wave that is triggered by an earthquake during night time and a full moon is present?
tsunami
How do landmasses move along a strike-slip fault?
two landmasses move against each other sideways in opposite directions.
Which of the following may not be responsible for triggering a tsunami?
typhoons
What quantity defines the amount of electric potential energy per unit charge?
voltage
Which of the following may strengthen a typhoon?
warm swampland
What explains the absence of tropical cyclones near the equator?
weak Coriolis force
What is the usual direction of typhoons that form in the West Pacific ocean?
westward
This may be used in locating members of the family in case anyone gets lost.
whistle
What would result if all colors of the spectrum are combined?
white light