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WorksheetsPRE-SUMMATIVE TEST 4.1
Total questions: 70
Worksheet time: 40mins
The diagram shows a research vessel using sonar to map the ocean floor.
Upon which basic behavior of sound waves does this technology depend on?
absorption
compression
reflection
refraction
Which part of the radio separate and amplifies one selected frequency from other frequencies?
tuner
speaker
amplifier
demodulator
How are events around the world sent and received in our respective communication devices such as mobile phones?
by means of radio waves that are sent through high antennae
by means of radio waves that are sent back through man-made satellites
by means of radio waves that are made to pass through under the ocean cables
by means of radio waves that are sent through the lower part of the atmosphere
Which of the following is the best transmitter of sound?
air
steel
water
rubber
Where do sound waves travel the fastest?
vacuums
liquids
gases
solids
Which of the following is correctly paired using the principles governing sound?
slower vibration = lower pitch
faster vibration = lower pitch
thicker string = higher pitch
longer string = higher pitch
How is ocean depth best determined?
an altimeter at the ocean floor
a light beam and reflecting it at the bottom of the ocean
an anchor tied to a rope and lowering it to the ocean floor
a sonar to measure length of time it takes sound to travel from the ocean floor
What property of sound where the pitch of a sound is higher than normal when the source is approaching to the listener?
doppler effect
reflection
Diffraction
Huygen's principle
In what sound intensity does threshold of pain starts?
60 dB
110 dB
120 dB
130 dB
Which of the following animals can detect ultrasonic sound?
whales
dogs
dolphins
cats
Why does sound travel faster in WARM air?
air molecules move around faster
Increase of energy transfer
particles vibrates faster
all of the above
What sound waves diffracts more?
low frequency sound waves
high frequency waves
low frequency sound waves, because of its longer wavelengths
high frequency sound waves, because of its shorter wavelengths
Where is the direction of sound waves during night time?
refracted towards the sky
refracted towards the ground
Why do diamond glitters and twinkles?
because it can polarized light
because it absorbs all the colors of whit light
because it has a low refractive index
because it has a very high refractive index
What makes laser beams different from ordinary light beams?
lasers are moderate and incoherent
lasers are polychromatic and coherent
lasers are monochromatic and coherent
lasers are monochromatic and moderate
Marty and Jonas are spending the week at the beach. The ultraviolet rays on their skin are electromagnetic waves, and the ocean waves in which they swim are mechanical waves. What is the main difference between a mechanical wave and an electromagnetic wave?
Electromagnetic waves transfer matter, and mechanical waves do not.
Mechanical waves transfer energy, and electromagnetic waves do not.
Electromagnetic waves have more energy than mechanical waves.
Mechanical waves require a medium, and electromagnetic waves do not.
What happens to the light particles when light hits an uneven surface.
They are reflected off in a straight line.
They are scattered in many directions.
They are absorbed by the surface.
They pass through the surface.
What light in the EM spectrum enables us to see things?
visible
gamma
ultraviolet
What is the correct order of waves on the EMS from low to high energy?
Gamma, X-ray, Ultra, Vis, Infra, Micro, Radio
Vis, Micro, Infra, Ultra, X-ray, Gamma, Radio
Micro, Radio, Vis, Infra, Ultra, X-ray, Gamma
Radio, Micro, Infra, Visible, Ultra, X-ray, Gamma
Which has the LONGEST wavelength and, therefore, the LOWEST frequency/energy?
infrared rays
gamma rays
ultraviolet
visible Light
How are Electromagnetic waves different from Mechanical waves?
EM waves have very short wavelengths
EM waves transmit energy instead of matter
EM waves can change direction by reflection
EM waves can travel through the vacuum of space (without particles)
Which type of electromagnetic radiation is used extensively in communications?
radio waves
gamma rays
infrared rays
X-rays
Which fields can microwaves be applied in?
I. Medicine
II. Communications
III. Culinary
IV. All of the above
I. and III.
I. and III.
II. and III.
IV.
What wave helps the skin make Vitamin D and helps the body absorb calcium?
Infrared
Visible light
Microwave
Ultraviolet Rays
How do Microwaves cook food?
The electromagnetic waves cause the molecules to vibrate quicker. This creates friction and heats/cooks food
The electromagnetic waves heat up the food molecules in a similar way as a conventional oven
The electromagnetic waves create a dry heat that warms the molecules in the food
The electromagnetic waves send heat to the molecules which makes them begin to vibrate and cook
Which of the following uses radio waves?
Mobile phones
Satellites
Televisions
ALL OF THE ABOVE
Which of the following are the advantages of optical fibers over the copper wires in telecommunication?
optical fibers are much cheaper
optical fibers have much clearer reception
optical fibers weigh much less than a comparable copper wire cable
ALL OF THE ABOVE
Who discovered the radioactive elements, polonium and radium?
Enrico Fermi
James Maxwell
Marie and Pierre Curie
Heinrich Rudolf Hertz
Which of the following are the benefits derived from the use of nuclear radiation?
I. Carbon Dating
II. Cure of Cancer Cells
III. Source of Energy
IV. Prolonged Storage of Agricultural Products
I and II only
I, III, and IV only
II, III, and IV only
I, II, III, and IV
What type of EM radiation is the most harmful to human body because it has the highest energy and frequency?
gamma ray
x-ray
visible light
microwave
What type of mirror used in a convenience store to provide a wide angle view to detect shoplifters?
Plane
Convex
Concave
Type of mirror used by a dentist to get magnified view of a patient's teeth...
Plane
Convex
Concave
Which of the following are the characteristics formed by plane mirror?
Virtual, Inverted, Laterally inverted, Same Size, Same Distance
Virtual, Upright, Laterally inverted, Same Size, Same Distance
Real, Inverted, Laterally inverted, Same Size, Same Distance
According to the law of reflection the angle of incidence is ____________ the angle of reflection.
less than
greater than
equal to
All of the following are examples of concave mirrors except one, what is it?
make up mirrors
dental mirrors
side mirrors
inward scoop of spoon
How does a concave lens differ from a convex lens?
A convex lens is another way to describe a plane mirror; a concave lens is curved
A concave lens is curved inward on both sides; a convex lens is on only one side
A convex lens has a thick center and thin edges, a concave lens has a thin center and thicker edges
A convex lens has a thin center and thick edges. a concave lens has a thick center and thinner edges
A telescope is a tool that helps people observe distant objects. In the simplest telescope design, incoming light hits a lens and is focused to a single point. This focused image is then magnified by a second lens so that it is roughly the same size as an observer's pupil. Which of the following wave behaviors plays the most important role in the functioning of this type of telescope?
refraction
interference
resonance
reflection
Which of the following made a great contribution in the better understanding of electricity and its advancement that we are currently enjoying now?
Alessandro Volta and his first electric battery "voltaic pile"
Benjamin Franklin and his lighting rod
Charles Coulomb and his Torsion balance
Michael Faraday and his electric motor
ALL OF THE ABOVE
What type of transformer should be connected to a radio with a rating of 110 volts if it is to be used in a house with a voltage line of 220 volts?
Step-up Transformer
Step-down Transformer
Transistor
Capacitor
In a transformer, the primary coil has 100 turns while the secondary coil has 200 turns. If the input voltage is 100 volts, then the output voltage should be ….
200 Volts
100 Volts
50 Volts
2000 Volts
When connected to a 110-V power supply, how much current exists in a light bulb that has a resistance of 220 Ohms?
0.50 Ampere
0.5 Ampere
2.00 Amperes
220 Ampere
Which of the following diagrams shows the magnetic field between two like poles?
If a stream of electrons are moving from left to right between the poles of a UNIFORM MAGNETIC FIELD, in what direction will electrons be deflected?
toward the South pole
toward the North pole
perpendicularly inward
no deflection of electrons
Which of the following materials that show NO ELECTRICAL RESISTANCE even at low temperatures and is widely used for long distance electric power transmissions life levitated trains?
semiconductors
superconductors
conductors
insulators
Diodes are essential electrical component of an Integrated circuit especially in radios and computers because....
it allows the current to flow in one direction
it regulates the amount of voltage supplied
it cuts off power when short circuits happen
it stores charges
Why does a compass needle move when placed beside a live wire or current carrying wire?
because of the wire itself
because of the magnetic field of the magnet inside the compass
because of the magnetic field of the Earth
because of the magnetic field around the wire
It is a semiconductor wafer on which thousands or millions of tiny
RESISTORS, CAPACITORS, DIODES, TRANSISTORS are fabricated.
electric circuit
integrated circuit
regulating circuit
amplifying circuit
Coulomb's Law states that the force of attraction or repulsion between the 2 electrically charged bodies is directly proportional to the product of their changes and ...
inversely proportional to the square of the distance between them.
inversely proportional to the distance between them.
directly proportional to the square of the distance between them.
directly proportional to the distance between them.
Which LOGIC GATE is illustrated by the picture given? (connected in series circuits)
OR gate
NOT gate
AND gate
NOR gate
Which of the following graphs best describes the RELATIONSHIP of CURRENT and VOLTAGE as explained and stated in OHM's law?
Which of the following pair of label and symbol of electronic component is NOT correct?
What device whose function is to change electrical energy to mechanical energy?
generator
motor
transformer
transistor
Why is electric current fatal to human even if it just carries a small amount of charge?
it can cause strong convulsive muscle stiffness
it can interfere nerve impulses and processes in the heart causing irregular heartbeat
it can damage the tissues and bones in the body
it can burn the body
Which of the following factors affect the amount of capacitance to store charges?
the area of the plates
the distance between the plates
the ability of the insulator to support static force
ALL OF THE ABOVE
A device that is made of primary and secondary coils or windings in which the electrical energy in the primary coil is transferred to the secondary coil through electromagnetic induction is called
transformer
refrigerator
generator
motor
A parallel circuit of 3 resistors is supplied by a 12-ampere current from the battery. How much current will each resistor have?
0 AMPERE
12 AMPERES
4 AMPERES
36 AMPERES
Which of the following is not an equation to solve for the POWER rating or POWER dissipated in a circuit?
P = IV
P = I2R
P = IR/V
P = W/t
What logic gate is used if the input is 0, the output is 1 and if the input is 1, the output is 0?
AND gate
OR gate
INVERTER gate
NOR gate
When object A and B are brought near each other, THEY ATTRACT. Which of the following statements is NOT TRUE about their attraction?
Object A and B are oppositely charged
Object A and B are positively charged
Object A is neutral, and object B is positively charged
Object A is neutral, and object B is negatively charged
Michael Faraday discovered that if a wire is moved to cut across magnetic lines of force, then
the wire is deflected
the magnetic field is amplified
the electric current is induced in the wire
the resistance of the wire is increased
What safety device should be installed at home to interrupt an electric circuit when the current produced exceed from what is specified?
galvanometer
transformer
circuit breaker
volage regulator
An electric heater draws a current of 0.50 A when connected to 220 V. Calculate the power rating of the kettle.
0.50 W
110 W
220 W
130, 000 W
What would happen with the magnets in the picture above?
They would repel
Nothing
They would attract
They would repel and then attract
Why are electromagnets better than permanent magnets?
they can attract all metals, not just iron
they can attract copper, permanent magnets can't
They can be turned on and off.
they can never run out of energy, because they don't run on electricity
When running a current through a wire, what do the blue lines represent?
The wire spinning
magnetic field
electric field
magnetic flux
