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NMAT REVIEW 2018 PHYSICS MODULE C DIRECTIONS: Select the best answer to each of the following questions and blacken the appropriate space on your answer sheet. 1. Waves transmit from one place to another by: A. mass B. amplitude C. wavelength D. energy 2. Which of the following factors is responsible from transmitting waves? A. Amplitude B. Wavelength C. Energy D. Mass 3. Which of the following will be the result if the number of lines in a diffraction grating of a given width is increased? A. The wavelengths can be diffracted will will be shorter B. The wavelengths that can be diffracted will be longer. C. The spectrum produced will be narrower. D. The spectrum produced will be broader.
10. What happens when a dielectric material is placed in an electric field? A. The material becomes a conductor conductor B. The material becomes polarized C. The material undergoes electrolysis D. The material remains electrically inert 11. An electric generator operates according to the principle of: A. electromagnetism C. electricity B. magnetism D. motion 12. If current flows in A, a current in wire B will be produced by: A. resistance C. insulation B. induction D. convection
4. When waves are refracted, which property changes? A. Frequency C. Speed B. Period D. Amplitude 13. If a force of electrical origin is exerted on a charged body placed at a point in space, which of the following exists at that point? A. a current B. an electrical field C. an isolated charge D. an electromotive force 5. The two waves shown travel in opposite directions. If points X and Y fall on the same vertical line when the waves meet, what is the combined amplitude of the waves? A. 36 cm B. 12 cm C. 6 cm D. 0 cm 6. An object has a positive electric charge whenever… A. it has an excess of electrons B. it has a deficiency of electrons C. the nuclei of its atoms are positively charged D. the electrons of its atoms are positively charged 7. Two charges of + are 1 cm apart. If one of the charges is replaced by a charge of - the magnitude of the force between them is… A. zero B. the same C. larger D. smaller 8. In hydroelectric plants, electric energy is generated by… A. Making the water evaporate B. Distilling the water C. Changing the water chemically D. Making the use of the power of a waterfall 9. Electroplating results in a better quality product by applying a relatively… A. Strong current for a shorter time B. Strong current for a longer time C. Moderate current for a shorter time D. Moderate current for a longer time
14. A single quantum of electromagnetic radiation is called: A. compton B. hyperon C. photon D. phonon 15. All of the following particles can be accelerated by an electric or magnetic field except: A. neutron B. proton C. electron D. deuteron OPTICS (LENSES AND MIRRORS) 16. When an object is reflected in a plane mirror, the image is always… A. enlarged C. left-right reversed B. inverted D. real 17. A converging lens may not have… A. positive focal length B. one plane surface C. a negative focal length D. one concave surface
18. In the diagram above, the focal length of the lens is F. No image will be projected on the screen if a candle is placed… A. At 2F C. Beyond 4F B. At 3F D. Between F and the lens
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19. A 10-meter object is placed at a distance of 175 meters in front of a lens whose focal length is 50 meters. Which of the following describes the image formed? A. It is 4 meters long and inverted B. It is 4 meters long and erect. C. It is 25 meters long and inverted D. It is 25 meters long and erect. 20. A certain solar cooker is made of a big concave mirror. To get the greatest amount of reflected sunlight, where should the food be placed? A. At the focus of the mirror B. At the center of the curvature of the mirror C. Between the focus and the center of curvature of the mirror D. Above the center of the curvature of the mirror 21. Parallel rays for light passing through a convex lens can be made parallel again by passing them through: A. a glass plate C. concave lens B. another convex lens D. a translucent paper 22. A concave mirror has a 10-cm focal length. If an object 5 cm. wide is placed 25 cm in front of the mirror, the image is: A. virtual and reduced C. real and reduced B. virtual and enlarged D. real and enlarged
28. Which of the following is an implication of the formula E= 2? A. Energy can be created from nothing B. Matter can be created from nothing C. Relatively large amounts of matter can be changed into relatively small amounts of energy D. Relatively large amounts of energy can be obtained from relatively small amounts of matter 29. The velocity of light in water is approximately: A. 2.25 x 108 C. 4.5 x 108 B. 3 x 108
D. 1.33 x 108
30. An electron is travelling at 1% the speed of light. What is its kinetic energy in joules? (Speed of light = 3 x 108 ) A. 4.000 x 10-18 J B. 4.098 x 1010 J
C. 4.098 x 10-18 J D. 4.000 x 1018 J
31. If the velocity and frequency of a wave are both reduced to one half, the wavelength is: A. half as large C. twice as large B. the same D. doubled Illustration for no. 32
23. When a large atom such as U splits into two smaller atoms, then the combined mass of the products resulting from the splitting will be A. One half of the original mass B. The same as the original mass C. One half more than the original mass D. Two times more than the original mass 24. When a certain nucleus gave off radiation, its mass decreased by 4 and its charge decreased by 2. What radiation was given off? A. x-ray C. beta radiation B. alpha radiation D. gamma radiation 25. Which statement about moving electrons is not true? A. they are deflected by a magnetic field B. they are deflected by an electric field C. their masses are independent of their speed D. they have energy and momentum 26. The maximum speed of electrons produced by incident photons on a metal depends only on the: A. temperature C. intensity of the incident light B. electric field D. frequency of the incident light 13 27. The atomic reaction where 13 6 becomes 7 results in the release of A. A neutron C. A beta particle B. An alpha particle D. A gamma particle
32. The current I2 in the circuit is: A. 32 amp C. 3.5 amp B. 7 amp D. 1 amp 33. A capacitor acquires 0.0008 coulomb when 50 volts is applied. Its capacitance is: A. 0.16 microfarad C. 1.60 microfarad B. 16.0 microfarad D. 160.0 microfarad 34. The power rating of an electric motor which draws a current of 50 amperes from a 240-volt line is: A. 12.0 kw B. 1.2 kw C. 48.0 w D. 4.8 w 35. A charge of 60 coulombs moves through a circuit in 0.60 seconds. How much current is flowing through the circuit? A. 6 A B. 6.6 A C. 100 A D. 10 A 36. You are using an electric iron drawing current of 6 amperes and has a resistance of 20 ohms. How much energy will be used by the iron in 60 s? A. 43,200 J B. 7,200 J C. 200 J D. 20,000 J
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37. If electrical energy costs PHP 0.50 per kilowatt-hour, how much will one pay to use a 2 HP air conditioner for 5 hours? (746 Watt = 1 HP) A. PHP 3.70 B. PHP 2.80 C. PHP 2.00 D. PHP 5.70
46. Which medium is the densest?
For the ff. numbers 38-40, in the circuit shown below:
A. medium 1 B. medium 2 C. medium 3 D. any of the above 38. What is the current in the 5.0-Ω resistor in the circuit? A. 0.42 A B. 0.67 A C. 1.5 A D. 2.4 A 39. What is the potential drops in the 3.0-Ω in the circuit? A. 2.5 V B. 4.5 V C. 6.5 V D. 8.5 V 40. An object that is placed in front of a converging mirror will never result to an image that is A. virtual, upright, maximized B. real, inverted, diminished C. real, inverted, maximized D. virtual, upright, diminished 41. Which of the following eye defects can be corrected using converging lens? A. myopia C. sore eyes B. astigmatism D. hyperopia 42. You have a normal vision if the image is exactly located at the retina of the eye. What is the eye defect when the image is formed behind the retina? A. astigmatism C. sore eyes B. hyperopia D. myopia
43. A 22-rifle bullet, traveling at 375 , strikes a wall,
which it penetrates to a depth of 0.075 m. The mass of the bullet is 1.75 grams. Assume a constant retarding force. How much time is required for the bullet to stop? A. 4 x 10-4 s C. 5 x 10-3 s -4 B. 3 x 10 s D. 4 x 10-5 s
47. At what location in front of a converging lens should you place the object in order to obtain no image? A. at the center of curvature B. beyond the center of curvature C. between the vertex and focal point D. at the focal point 48. An object that is placed in front of a diverging mirror will always result to an image that is A. Virtual, erect, diminished B. Virtual, inverted, maximized C. real, erect, diminished D. real, inverted, maximized 49. Which of the following eye defects can be corrected using diverging lens? A. hyperopia B. myopia C. sore eyes D. astigmatism 50. Light is a form of electromagnetic wave. Comparing the speed of light with other forms of electromagnetic waves, which of the following travels at the slowest speed in vacuum? A. Radio waves B. Infrared rays C. gamma rays D. all these travel at the same speed
44. A hypothetical atom has 3 energy levels: the ground level, 2.00 eV, and 5.00 eV above the ground level. Which frequency of the spectral lines cannot be emitted when excited?
( = . − ∙ ) A. 4.84 x 1014 Hz B. 7.25 x 1014 Hz
C. 9.67 x 10-14 Hz D. 12.1 x 1014 Hz
45. A 10-pound object is suspended by a string from an overhead support. A horizontal force of 5.8 pounds is applied on the object. The measure of the angle which the string makes with the horizontal is: A. 300 B. 450 C. 600 D. 900
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