PYP 001 Final Exam Code: Term: 141 Thursday, January 8, 2015 Page: 1

Transcription

1 Term: 141 Thursday, January 8, 2015 Page: 1 *Read the following (30) questions and choose the right answer: 1 Which of the following statements is TRUE? A) Methane (CH 4 ) is a pure substance. B) Dreams and thoughts are examples of invisible matter. C) An element is made up of molecules. D) Matter can be classified as a homogeneous mixture or a heterogeneous mixture. E) In a mixture, substances always combine in a specific ratio. 2 Boiling is a. A) physical change. B) chemical change. C) physical property. D) chemical property. E) sign of a chemical change. 3 Which of the following statements is wrong about gases? A) The volume of a gas is inversely proportional to its temperature at constant pressure. B) Gases have the property of diffusion. C) The volume of a gas is inversely proportional to its pressure at constant temperature. D) A Gas has neither a definite volume nor a definite shape. E) When a substance is in gaseous state, it has more thermal energy than when it is in liquid or in solid state.

2 Term: 141 Thursday, January 8, 2015 Page: 2 4 About three out of four chlorine atoms are chlorine-35, and about one out of four are chlorine-37. What is the average atomic mass of chlorine? A) 35.5 amu. B) 26.3 amu. C) 9.25 amu. D) 37.0 amu. E) 36.0 amu. 5 The isotope cesium-137, which has a half-life of 30 years, is a product of nuclear power plants. How long will it take for this isotope to decay to half of its original value? A) 30 years. B) 0 years. C) 15 years. D) 60 years. E) 90 years.

3 Term: 141 Thursday, January 8, 2015 Page: 3 6 Figure (1) represents the motion of a swimmer during a 30-minute workout. What is the average speed of the swimmer during his workout? A) 47 m/min. B) 60 m/min. C) 80 m/min. D) 140 m/min. E) Zero. 7 A car was initially moving with 100 km/h southward accelerates northward by 5 km/h.s. What is the velocity of the car after 40 seconds? A) 100 km/h, northward. B) Zero C) 100 km/h, southward. D) 200 km/h, southward. E) 200 km/h, northward.

4 Term: 141 Thursday, January 8, 2015 Page: 4 8 A skydiver experiences an air resistance of 1480 N when his parachute is open. If the mass of the skydiver and his parachute is 100 kg, what is his acceleration? A) 5.0 m/s 2, upward. B) 5.0 m/s 2, downward. C) 9.8 m/s 2, downward. D) 9.8 m/s 2, upward. E) 13.8 m/s 2, upward. 9 The mass of planet Jupiter is about 300 times the mass of Earth and its radius is about 10 times the radius of Earth. Compared to your weight at the surface of Earth, your weight at the surface of Jupiter would be A) 3 times as large. B) 300 times as large. C) 30 times as large. D) 3 times as small. E) 30 times as small. 10 A 20-kg object dropped from a height of 5 meters hits the ground after 1.01 seconds. What is the work done by gravity on the object during its fall? A) 980 J B) 100 J C) 196 J D) Zero J E) 970 J 11 A 9-kg object falls through air and reaches a terminal speed of 5 m/s. What is the power delivered by the gravitational force to the object while it is falling at this terminal speed? A) 441 W. B) 45 W. C) 88 W. D) Zero. E) 49 W.

5 Term: 141 Thursday, January 8, 2015 Page: 5 12 A pendulum swings to a height (h) above the ground at the highest points and is practically touching the ground at the lowest point, as in Figure (2). If the maximum speed of the pendulum is 1.40 m/s, what would be its maximum height (h)? (Hint: You may use the law of conservation of energy) A) m B) m C) m D) m E) 1.40 m 13 A wave is propagating along a string as in Figure (3). What is the amplitude of this wave? A) 1.0 cm. B) 2.0 cm. C) 4.0 cm. D) 3.0 cm. E) Zero.

6 Term: 141 Thursday, January 8, 2015 Page: 6 14 For a given wave, if the frequency is doubled, its wavelength A) is halved. B) doubles. C) becomes four times larger. D) remains the same. E) is reduced by four times. 15 When the motion of the medium is at right angles to the wave s direction, the wave is called A) a transverse wave. B) a longitudinal (compressional) wave. C) a mechanical wave. D) an electromagnetic wave. E) None of these. 16 Water waves are approaching a lighthouse at a rate of 1 wave every 1.2 s. The distance between adjacent crests is 7.0 m. What is the speed of the waves? A) 5.8 m/s B) 8.4 m/s C) 0.17 m/s D) 4.2 m/s E) 2.9 m/s 17 Sound travels fastest in A) steel. B) water. C) air at 20 C. D) air at 0 C. E) outer space.

7 Term: 141 Thursday, January 8, 2015 Page: 7 18 The Doppler effect occurs A) whenever there is a relative motion between a source of sound and a listener. B) only when a source of sound moves toward a listener. C) only when a listener moves toward a source of sound. D) only when a listener and a source of sound move away from each other. E) only when a listener and a source of sound move toward each other. 19 A 30-dB sound is louder (more intense) than a 10-dB sound. A) 100 times. B) 10 times. C) 20 times. D) 1000 times. E) 2 times. 20 Which one of the following light sources produces a coherent light? A) Lasers. B) Incandescent lights. C) Neon lights. D) Tungsten-Halogen lights. E) Fluorescent lights. 21 What type of electromagnetic waves is used by the plants in the process of photosynthesis? A) Visible light. B) Infrared waves. C) Ultraviolet. D) Radio waves. E) Microwaves.

8 Term: 141 Thursday, January 8, 2015 Page: 8 22 A lightbulb with a resistance of 10.0 Ω allows a 1.20 A current to flow when connected to a battery. What is the power of the lightbulb? A) 14.4 W. B) 12.0 W. C) 120 W. D) 8.33 W. E) 1.20 W. 23 When a certain battery is used to power a 5.0-W flashlight bulb, it is dead after 2.0 hours of use. How many batteries will you throw away when your flashlight consumes a total of 1.0-kW.h of electrical energy? A) 100 B) 10 C) 1000 D) 50 E) The electric force between a pair of charged objects is A) directly related to the magnitude of the charges of the objects. B) directly related to the distance between objects. C) inversely related to the magnitude of the charges of the objects. D) directly related to the masses of the objects. E) inversely related to the masses of the objects.

9 Term: 141 Thursday, January 8, 2015 Page: 9 25 Which of the following statements is wrong? A) The magnetosphere protects Earth from dangerous electromagnetic waves, like X rays and gamma rays. B) Organized groups of atoms lined up with their magnetic poles pointing in the same direction are called magnetic domains. C) When a compass points toward the north, it is actually tilted about 11º from the geographic north pole. D) A permanent magnet can lose its magnetism if it gets very hot. E) Magnetic induction is the process by which a magnetic field is created in a material as a result of aligning the material s domains. 26 Figure (4) shows the magnetic field lines produced by a bar magnet. At which point the magnetic field is strongest? A) point 3 B) point 2 C) point 1 D) point 4 E) point 5

10 Term: 141 Thursday, January 8, 2015 Page: A transformer is plugged into an electric outlet, and an 8-Ω lightbulb is plugged into the transformer as shown in Figure (5). What is the electric current in the lightbulb? A) 1.38 A B) A C) 88.0 A D) 27.5 A E) Zero 28 Which of the following statements is FALSE? A) Galvanometer is a device that converts mechanical energy into electricity. B) Increasing the speed with which a magnet moves through a wire coil increases the amount of current produced in the wire coil. C) DC (direct current) cannot be used in the primary coil of a transformer. D) When a current-carrying wire is bent into a loop, the magnetic field inside the loop is stronger than the magnetic field surrounding a straight, current-carrying wire. E) Unlike regular magnets, the poles in an electromagnet can be reversed.

11 Term: 141 Thursday, January 8, 2015 Page: Which of the following statements is FALSE? A) A well is a point or an opening where groundwater naturally flows out of the ground. B) About 97.5% of the water on Earth is salt water. C) Most liquid fresh water on Earth is groundwater. D) Fresh water is a renewable resource. E) A confined aquifer that is under pressure is an artesian aquifer. 30 Most of worldwide use of freshwater is for A) irrigation. B) industry. C) household purposes. D) environmental purposes. E) recreation.

12 ID: A *Read the following (30) questions and choose the right answer: Answer Section MULTIPLE CHOICE 1 ANS: A PTS: 1 2 ANS: A PTS: 1 3 ANS: A PTS: 1 4 ANS: A PTS: 1 5 ANS: A PTS: 1 6 ANS: A PTS: 1 7 ANS: A PTS: 1 8 ANS: A PTS: 1 9 ANS: A PTS: 1 10 ANS: A PTS: 1 11 ANS: A PTS: 1 12 ANS: A PTS: 1 13 ANS: A PTS: 1 14 ANS: A PTS: 1 15 ANS: A PTS: 1 16 ANS: A PTS: 1 17 ANS: A PTS: 1 18 ANS: A PTS: 1 19 ANS: A PTS: 1 20 ANS: A PTS: 1 21 ANS: A PTS: 1 22 ANS: A PTS: 1 23 ANS: A PTS: 1 24 ANS: A PTS: 1 25 ANS: A PTS: 1 26 ANS: A PTS: 1 27 ANS: A PTS: 1 28 ANS: A PTS: 1