Download PYP001-122-Final Exam Solution [Choice A is the correct

PYP001-122-Final Exam Solution
[Choice A is the correct answer for all the questions]
Q1. Which of the following processes can be used to separate water (H2O) into its
individual elements?
A) Electrolysis.
B) Freezing.
C) Evaporation.
D) Boiling.
E) Filtering.
Q2. Which of the following statements is TRUE?
A) Thermal energy that is transferred from one substance to another is called heat.
B) The temperature of the melting point is the same as the temperature of
vaporization point for a substance.
C) All changes of state involve a change in color.
D) The change of state from a gas to a liquid is called sublimation.
E) Increasing pressure decreases the boiling point of a liquid.
Q3. A 200-gram sample of a radioactive substance decays such that its mass is
reduced to 25 grams in 18.6 hours. What is its half-life?
A) 6.2 hours.
B) 12.4 hours.
C) 2.3 hours.
D) 55.8 hours.
E) 9.3 hours.
Q4. The number of valence electrons in Halogens is
A) None of these.
B) One.
C) Five
D) Eight
E) Three.
Q5. Ordinary Chlorine is a mixture of 75.53% of the Chlorine-35 isotope (atomic
mass = 34.969 amu) and 24.47% of the Chlorine-37 isotope (atomic mass = 36.966
amu). What is the average atomic mass of Chlorine?
A) 35.458 amu
B) 36.966 amu
C) 34.969 amu
D) 36.500 amu
E) 35.968 amu
Q6. A radioactive nucleus has Z protons and N neutrons. When this nucleus decays
by the emission of a beta particle ( 01 e), this results in a new nucleus with
A) Z + 1 protons.
B) Z − 1protons.
C) Z protons.
D) N + 1 neutrons.
E) N neutrons.
Q7. How fast an object is moving in a certain direction is described by the object’s
A) Velocity
B) Speed.
C) Acceleration.
D) Momentum.
E) Kinetic energy.
Q8. The figure below shows the position-time graph for an object moving in a
straight line. What is the average speed of this object for the whole trip of 40
seconds?
Fig#
A) 7.5 m/s
B) 2.5 m/s
C) 10.0 m/s
D) 5.0 m/s
E) 25.0 m/s
Q9. Two identical balls (each with a mass of 1 kg) are moving toward each other
as shown in the figure below. The first ball is moving East at 4 m/s and the second
is moving West at 7 m/s. With no external forces acting, what is the total
momentum of the two balls after collision?
Fig#
East
West
A) 3 kg.m/s West.
B) 7 Kg.m/s West.
C) 11 kg.m/s East.
D) 3 kg.m/s East.
E) Zero kg.m/s.
Q10. 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 larger.
B) 300 times larger.
C) 30 times larger.
D) 3 times smaller.
E) 30 times smaller.
Q11. The figure below shows the velocity-time graph of an object moving in a
straight line. What is the acceleration of the object at t = 20 seconds?
Fig#
A) − 4 m/s2
B) − 2 m/s2
C) − 8 m/s2
D) + 4 m/s2
E) + 2 m/s2
Q12. A 2-kg object is dropped from a height of 15 meters above ground. What is
the kinetic energy of the object when it is 10 m above the ground?
A) 98 J
B) 196 J
C) 392 J
D) 294 J
E) 20 J
Q13. A skydiver is falling into the air. The speed-time graph of his motion is
shown in the figure below. At which point (a, b, c, d or e) did the skydiver open his
parachute?
Fig#
A) (c)
B) (a)
C) (b)
D) (d)
E) (e)
Q14. Which of the following statements is TRUE?
A) Electromagnetic waves with longer wavelength carry less energy.
B) The total energy of an object at rest must be zero.
C) Nerves use radiant energy to communicate with the body.
D) Electromagnetic waves are compressional waves.
E) Useful energy is always equal to wasted energy.
Q15. Which of the following statements is FALSE?
A) As the energy of a transverse wave increases, its amplitude decreases.
B) The amplitude of a compressional wave depends on how tightly the medium is
squeezed.
C) The frequency and period of a wave are inversely related.
D) An important property of waves is that they transfer energy, but not matter,
from place to place.
E) None of these.
Q16. A student shakes a rope back and forth to form waves. Compared to the rate
of the rope’s vibration, the rate at which crests and troughs form is
A) The same.
B) Twice as much.
C) Half as much.
D) Four times as much.
E) One-fourth as much.
Q17. If the speed of sound in a medium is 5100 m/s, this medium is a
A) Solid.
B) Liquid.
C) Gas.
D) Vacuum.
E) None of the others.
Q18. Compared to a 0-dB sound, a 20-dB sound is --------- times louder.
A) 100
B) 20
C) 200
D) 2
E) 10
Q19. Order the following electromagnetic waves as a function of their frequency,
smallest first.
A) Microwaves, Visible light, X rays.
B) Microwaves, X rays, Visible light.
C) X rays, Visible light, Microwaves.
D) X rays, Microwaves, Visible light.
E) Visible light, X rays, Microwaves.
Q20. Which type of electromagnetic wave from the Sun has the greatest intensity?
A) Visible light.
B) Infrared.
C) Ultraviolet.
D) X rays.
E) Microwaves.
Q21. Which of the following statements is TRUE?
A) None of these.
B) Like charges attract one another, but opposite charges repel each other.
C) Neutrons and electrons attract each other.
D) Electrons are found inside the nucleus of an atom.
E) Neutrons and protons repel each other.
Q22. Which of the following materials is a good insulator?
A) All of these.
B) Glass.
C) Air.
D) Plastic.
E) Rubber.
Q23. Which of the following statements is FALSE?
A) Magnets made of materials that are easy to magnetize, but lose their magnetism
easily, are called electromagnets.
B) Magnetic induction occurs when one magnet makes another material magnetic.
C) Magnets always have two poles.
D) Moving electric charges produce magnetic fields.
E) None of these.
Q24. Which of the following statements is FALSE?
A) None of these.
B) An electric current produces a magnetic field.
C) The magnetic field strength of an electromagnet can be altered by changing the
current through it.
D) An electric current is produced when there is relative movement between a wire
loop and a magnetic field.
E) Electromagnetic induction occurs when a changing magnetic field produces
forces that push electrons through a wire, creating a current.
Q25. Semiconductors are extremely important in electronic devices because
A) Their electrical conductivity can be altered and controlled.
B) They are cheap to produce.
C) Most elements of the periodic table are semiconductors.
D) They are safe to use.
E) None of these.
Q26. In cellular phones, the data are transmitted to and from a cell phone as
A) Microwaves.
B) Radio waves.
C) Infrared waves.
D) Sound waves
E) Light waves.
Q27. The physical principle upon which lasers are based is called
A) Stimulated emission.
B) Spontaneous emission.
C) Atomic emission.
D) Stimulated absorption.
E) None of these.
Q28. Which of the following figures represent(s) spontaneous emission?
Fig#
A) (b)
B) (a)
C) (c)
D) (b) and (c)
E) None of these.
Q29. Some of the largest dams in Saudi Arabia are located in the Wadi Jizan, Wadi
Fatima, Wadi Bisha and Najran. Water from these dams is mainly used for
A) Agriculture.
B) Industry.
C) Domestic use.
D) Recreation.
E) Fishing.
Q30. In the figure below, the area referred to by “X” is
Fig#
X
A) Artesian well.
B) Flowing artesian well.
C) Spring.
D) Swamp.
E) Dam.