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# NATIONAL ACHIEVMENT TEST REVIEWER!

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## shonnel allocahi

on 2 March 2014

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#### Transcript of NATIONAL ACHIEVMENT TEST REVIEWER!

NATIONAL ACHIEVMENT TEST REVIEWER!
FIRST STEP

1. Which of the following explain/s why the ash has lower mass than the log after burning?
I. Some amount of mass can be associated with the formation of vapor and other gases during burning.
II. Small amount of mass can be associated with the change in energy that occurs during burning.
A. I only B. II only C. Both I and II D. Neither I nor II

2. If we burn the log in an enclosed system, how do the total mass-energy of the system before and after the burning compare?
A. The total mass-energy of the system before and after burning is the same.
B. B. The total mass-energy before burning is much greater than the total mass-energy after burning.
C. The total mass-energy after burning is much greater than the total mass-energy before burning.
D. The total mass-energy after burning is a little less than the total mass-energy before burning.

3.The image formed by a plane mirror is LATERALLY INVERTED. Which of the following examples best describes this?
A. When a boy moves toward the mirror, his image will move away from the mirror.
B. When a boy moves toward the mirror, his image will move at the side of the mirror.
C. When a girl raises her left hand, her image will also raise its left hand.
D. When a girl raises her left hand, her image will raise its right hand.

4.Which situation below correctly describes an example of an image formed by a plane mirror?
A. A boy waving his right hand is also waving his right hand in the mirror.
B. A bottle is seen inverted in a plane mirror.
C. The image of the girl is larger than her actual size.
D. A girl’s ribbon on the right side of her head is seen on the left side of her image.

5.The retina is the part of the eye where image is formed. What is its counterpart in the camera?
A. Film
B. Shutter
C. Aperture
D. Diaphragm

6.Which statement/s is/are TRUE?
I. The film regulates the amount of light that enters the camera by changing the size of the aperture.
II. The iris controls the amount of light that enters the eye by changing the size of the pupil
A. Only I is true
B. Only II is true
C. Both I and II are true
D. Neither I nor II is true
SECOND STEP
7. Which statement is TRUE about how concave and convex lenses can be used to correct a person’s eye sight defect?
A. They can be used to minimize the glare of light.
B. They can be used to adjust the size of the object.
C. They can be used to redirect the light rays so that they may land on the retina.
D. They can be used to increase or decrease the length of the rays so that they may land on the retina.

8. How can convex lenses correct farsightedness?
A. They select the light rays that can enter the eyes.
B. They allow the light rays to spread before entering the eyes.
C. They allow the light rays to pass in a straight line before entering the eyes.
D. They make the light rays bend towards each other before entering the eyes.

9.Which of the following situations exemplifies the dispersion property of light?
A. The swaying movement of a coin moving under water.
B. The rainbow in the sky after a rain shower.
C. The image of a flower in the mirror
D. The sparkling glow of a diamond ring.

10. What effect does interference of light waves have on the soap bubbles?
A. They become heavier.
B. The produce different colors at the surfaces.
C. They become larger.
D. The produce image of objects like a mirror.

11.Which of the following does NOT allow sound to pass through?
A. Air B. Wood C. Water D. Vacuum

12.The immediate or short term effect of exposure to large doses of ionizing radiation include the following EXCEPT . .
A. Frequent vomiting
B. Becoming prone to infection
C. Formation of cancerous tumors
D. Falling blood counts
THIRD STEP
13.How does irradiation helps in food preservation?
A. It maintains the natural color of food.
B. It adds more nutrients to food.
C. It hastens sprouting or growth of root crops.
D. It delays natural ripening of fruits.

14.Which of the following is a good medical practice when one is exposed to radiation?
A. Using gloves all the time.
B. Wearing mask while inside the hospital.
C. Drinking plenty of water before performing a radiological procedure

15.Given the same doses and time of exposure, which of the following types of radiation would have the greatest damage to human organs?
A. Beta
B. Alpha
C. Gamma
D. Options A, B, and C equally harm human organs

16.Current (I), voltage(V) and resistance(R) are related to Sir George Simon Ohm through Ohm’s Law. Which of the following is NOT true about this law?
A. I is directly proportional to V and inversely proportional to R.
B. V is directly proportional to I and inversely proportional to R.
C. R is directly proportional to V and inversely proportional to I.
D. Voltage is directly proportional to I and R.

FOURTH STEP
18.Based on the Coulombs Law equation below, what happens to the force(F) between two charged objects(Q1 and Q2)if their distances(d) are made twice farther from each other?
F= K.Q1.Q2
d2
A. It increases two times their original force.
B. It increases four times their original force
C. It decreases four times their original force.
D. It remains the same.

19.Draw the circuit of the following:
Resistors 1 and 2 are connected in parallel while resistor 3 and 4 are connected in series to the AC source

20.Draw the circuit of the following:
Resistors 1 and 2 are connected in series while resistor 3 and 4 are connected in parallel to the AC source.

FIFTH STEP
21. Which the given equation below, What will happen to the current (I) in the circuit if the power (P) becomes double and the voltage (V) remains the same.
I =P/V
A. It will double
B. It will decrease twice
C. It will increase four times
D. It will remains the same

22. Which part of the electrical line is responsible in reducing the voltage to 220 volts in residential places?
A. Industrial power plant
B. Distribution substation
C. Distribution transformer
D. Transmission substation

23.How can the magnetic field strength of an electromagnet be reduced?
A. Use iron as a core.
B. Increase the number of loops in the coil.
C. Decrease the number of loops in the coil.
D. Increase the current through the coil.
SIXTH STEP
24. Which of the following explains why it is important to switch off the electrical appliances first before cleaning them
A. Electrical appliances tend to malfunction when cleaned while switched on.
B. Electrical appliances may overheat and cause fire
C. Metal parts of electrical appliances may develop rust
D. Electric fields in the wirings are present when the appliances are switched on

25. In which of the following situations will an electromagnet loss its magnetic property?
A. When there is no current passing through it.
B. When there is no magnet connected to it.
C. When there is current passing through it.
D. When there is a magnet connected to it.

26. If ten (10) 40-watt bulbs were used for 8 hours a day, how much would it cost for 2 days if one KWh costs Php 5.50?
A. 1.76 B. 17.60 C. 22.00 D. 35.20
SEVENTH STEP
27. Which of the following describes the transformation of energy in an electric motor?
A. Mechanical energy Electrical energy
B. Electrical energy Mechanical energy
C. Chemical energy Mechanical energy
D. Chemical energy Electrical energy
28. Which of the following is NOT true about an electric motor?
A. It works on direct current.
B. It converts mechanical energy to electrical energy.
C. It involves the interaction of magnetic field and current-carrying conductors.
D. It operates on the same principles as generators
29. Which of the following statements is TRUE about the energy possessed by an old bell that is hanging on top of a tall tower?
A. It possesses its highest kinetic energy.
B. It possesses its maximum potential energy.
C. Its potential energy is equal to its kinetic energy.
D. Its energy is converted from kinetic to potential energy.

30.Which of the following situations correctly illustrates Newton’s Law of Acceleration?
A. The car moves slow due to the force exerted by the strong wind against its direction.
B. The boy is thrown forward when his motorcycle bumps on the hump.
C. The skateboard has slowed down on its own when the girl stopped pushing it.
D. The small box moves faster than the big box given the same amount of pulling force.
EIGHTH STEP
31. Which law of motion can be used to understand the effectiveness of using seatbelts to prevent injury?
A. Law of inertia
B. Law of interaction
C. Law of acceleration
D. Law of gravitational attraction

32. If you have the control over a moving object that is sure to collide with another object, which of the following should you do to lessen the impact of collision?
A. Decrease the momentum of the object over a short time.
B. Increase the momentum of the object over a short time.
C. Decrease the momentum of the object over a long time.
D. Increase the momentum of the object over a long time.

33. Most street barriers are made of hard rubber or plastic materials that easily give in or dent when hit. Why is this so?
A. To reduce the vehicle’s kinetic energy when it collides with the barriers.
B. To shore potential energy in the bumpers of vehicles.
C. To reduce the impact force when hit by a vehicle
D. To reduce the impact time when the barriers hit the vehicle.

VICTORY!
34. In a radio communication, which happens FIRST?
A. Signals from receiving antenna converts electronic signals into sound.
B. Sound is converted into audio-frequency (AF) signals.
C. The loudness or pitch of the sound is modulated.
D. High radio-frequency (RF) carriers are produced.

35. Through which of the following does sound travel fastest?
A. Air B. Wood C. Water D. Vacuum

36. Which of the following BEST
Explains why an internet is considered an information superhighway?
A. It is a network of networks connecting different countries through computers.
B. It allows machines to access date and information from computers.
C. It transmits different signals and information through computers.
D. It operates worldwide with the use of computers and electromagnetic waves even without signals
37. As we tune into our favorite radio TV station, which of the following events happens LAST to the modulated RF signals received by the receiving antenna?
A. The AF signals are energized in an amplifier.
B. The speaker converts the electronic signal into sound.
C. The microphone converts the sound into electronic signals.
D. The signals pass through the demodulator that separate the AR and RF signals.

38. LASER (Light Amplifier by Stimulated Emission of Radiation) helps improve telecommunications because of its following characteristics EXCEPT.
A. Being concentrated
B. Being extremely intense
C. Having highly parallel rays
D. Having the ability to produce continuous waves of different colors

39. The fiber optics is surrounded by material called “cladding” that reflects light back into the core, that is why the light signals can travel long distance. What property of light does it describe?
A. Diffraction B. Polarization C. Regulate reflection D. Total internal reflection

40. The effect of information superhighway on society may not always be positive. Some of its disadvantages are the following EXCEPT
A. Workforce is reduced
B. Social interaction is reduced
C. People become dependent on technology
D. The transfer of information takes place rapidly.

LAST STEP!
SONNY BOY BUCCAHI
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