Reference no: EM131355424

Topic: Chemistry

Questions 1 to 25: Select the best answer to each question. Note that a question and its answers may be split across a page break, so be sure that you have seen the entire question and all the answers before choosing an answer.

1. A solution that contains a small amount of salt and a large amount of water is said to be a _______ solution.

A. saturated
B. concentrated
C. monounsaturated
D. dilute

2. _______ are atoms that carry an electric charge.

A. Ions
B. Electrolytes
C. Nonelectrolytes
D. Colloids

3. The measure of the number of atoms in one element that will combine with an atom of another element is

A. molecular number.
B. atomic charge.
C. atomic number.
D. valence.

4. Which one of the following statements about sulfuric acid is correct?

A. Sulfuric acid is dangerous to living organisms.
B. Sulfuric acid is a strong oxidizing agent.
C. Sulfuric acid is a known muriatic acid.
D. Sulfuric acid has little effect on metals.

5. The valence of aluminum is +3, and the valence of chlorine is -1. The formula for aluminum chloride iscorrectly written as

A. AlCl3
B. Al3Cl.
C. ClAl3
D. Cl3Al.

6. The factor that affects how easily an electron can be removed from an atom is the

A. surrounding atoms.
B. size of the atom.
C. structure of the atom.
D. temperature of the environment.

7. The molecular mass of sodium oxide (Na2O) is

A. 45.97954.
B. 38.98917.
C. 22.98977.
D. 61.97894.

8. An atom of chlorine has several valence electrons in its

A. second shell.
B. nucleus.
C. first shell.
D. third shell.

9. Salt is the product formed by a reaction in which _______ atoms of an acid are replaced by the atoms of a metal.

A. hydrogen
B. nitrogen
C. carbon
D. oxygen

10. Which one of the following chemical equations is balanced?

A. KOH + H2
SO4
 → KHSO4
+ H2O
B. NH3
+ H2O → 2NH4OH
C. 2Na + S → 2NaS
D. 2NaCl + H2
SO4
 → HCL + NaSO4

11. Which of the following is represented in the highest percentage by volume in dry air?

A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Hydrogen

12. A chemical reaction in which two elements or radicals change places with two other elements or radicals is a _______ reaction.

A. substitution
B. decomposition
C. double replacement
D. combination

13. In the process of electrolysis, current can flow through a liquid because

A. hydrogen is electrically neutralized in the solution.
B. negative ions are attracted to the anode.
C. water molecules become negatively charged.
D. cations of the electrolyte accumulate at the positive electrodes.

14. A chemical reaction in which two or more substances undergo a chemical union to form a more complex substance is a _______ reaction.

A. combination
B. double replacement
C. decomposition
D. substitution

15. The chemical symbol for sodium is

A. S.
B. N.
C. Na.
D. Sn.

16. The process of splitting an atom into two lighter atoms is called

A. nuclear fusion.
B. nuclear disintegration.
C. nuclear fission.
D. nuclear separation.

17. Which one of the following groups of chemical compounds is composed entirely of organic compounds?
A. C2H4O, CH2O, CaSO4
, C3H5
(OH)3
B. Ch3OCH3
, Ca3
(PO4
)2
, CO2
, H2CO3
C. C2H2
, CH4
, CaCl2
, CaCN2
D. C6H6
, C2H5OH, C6H5CH3
, C3H5
(NO3
)3

18. Based upon the pH scale, a vegetable with a pH of 5.3 would be

A. basic.
B. neutral.
C. ionic.
D. acidic.

19. A substance that contains hydrogen that may be replaced by a metal is a/an

A. colloid.
B. base.
C. nonmetal.
D. acid.

20. Which of the following is one way to prevent the corrosion of iron?

A. Paint exposed iron parts with protective paint.
B. Let the iron develop a natural coat of carbonate.
C. Add carbon to the iron.
D. Protect the iron from polluted air.

21. In the chemical equation Zn + 2HCL → ZnCl2 + H2 , the reactants are

A. zinc chlorate and water.
B. zinc and hydrogen carbonate.
C. zinc and hydrochloric acid.
D. zinc chloride and hydrogen.

22. Sodium is preferred over potassium in industrial applications because

A. sodium is produced more economically.
B. potassium oxidizes more slowly in air.
C. sodium salts are easily decomposed.
D. potassium has a higher melting temperature.

23. If water and oil are combined in a container, the resulting liquid is a(n)

A. mixture.
B. suspension.
C. solution.
D. emulsion.

24. The element fluorine is classified in the periodic table as a/an

A. alkali metal.
B. metalloid.
C. halogen.
D. metal.

25. The periodic table is based on an element's

A. molecular mass.
B. molecular size.
C. atomic number.
D. atomic mass.

Topic : Light

Questions 1 to 25: Select the best answer to each question. Note that a question and its answers may be split across a page break, so be sure that you have seen the entire question and all the answers before choosing an answer.

1. Which of the following occurs when light is reflected from a rough or unpolished surface?

A. The original pattern of the light is preserved.
B. The original pattern of the light is distorted.
C. The angle of reflection is greater than the angle of incidence.
D. The angle of reflection is less than the angle of incidence.

2. Rays of light incident on a lens and parallel to the principal axis of the lens converge

A. in back of the lens.
B. at the focal point of the lens.
C. in front of the lens.
D. at the center of curvature of the lens.

3. A virtual image produced by a lens is always

A. smaller than the object.
B. located in front of the lens.
C. larger than the object.
D. located in the back of the lens.

4. The shortest wavelength within the visible spectrum is _______ light.

A. violet
B. orange
C. red
D. blue

5. The term angle of deviation is used in reference to

A. a polarizer.
B. a prism.
C. a lens.
D. an analyzer.

6. When an object is placed 8 millimeters from a concave spherical mirror, a clear image can be projected on a screen 16 millimeters in front of the mirror. If the object has a height of 4 millimeters, the height of  the image is

A. 4 millimeters.
B. 12 millimeters.
C. 8 millimeters.
D. 2 millimeters.

7. A typical mirror in a person's house would be an example of a/an _______ mirror.

A. angular
B. convex
C. concave
D. plane

8. If the distance from a converging lens to the object is less than the focal length of the lens, the image will be

A. virtual, upright, and smaller than the object.
B. real, inverted, and smaller than the object.
C. virtual, upright, and larger than the object.
D. real, inverted, and larger than the object.

9. A material that transmits nearly all the light in a ray because it offers little resistance to the light is

A. transparent.
B. fluorescent.
C. opaque.
D. translucent.

10. When the image of a distant object is brought into focus in front of a person's retina, the defect is called

A. spherical aberration.
B. chromatic aberration.
C. farsightedness.
D. nearsightedness.

11. In any one material, all electromagnetic waves have the same

A. amplitude.
B. frequency.
C. velocity.
D. wavelength.

12. A failure of the red-sensitive nerves in the eye to respond to light properly causes

A. chromatic aberration.
B. color blindness.
C. farsightedness.
D. astigmatism.

13. If you're driving towards the sun late in the afternoon, you can reduce the glare from the road by wearing sunglasses that permit only the passage of light that's

A. dispersed in a spherical plane.
B. polarized in a vertical plane.
C. polarized in a horizontal plane.
D. dispersed in a vertical plane.

14. The image formed by a convex spherical mirror will always be

A. upright and larger than the object.
B. inverted and smaller than the object.
C. upright and smaller than the object.
D. inverted and larger than the object.

15. The longest wavelength within the visible spectrum is _______ light.

A. violet
B. red
C. orange
D. blue

16. When a simple magnifying glass is used properly, the image will be formed

A. about 250 millimeters in front of the lens.
B. about 500 millimeters behind the lens.
C. at the focal point of the lens.
D. just inside the focal length of the lens.

17. The portion of a light ray that falls on a surface is a/an

A. diffuse reflection.
B. incident ray.
C. specular reflection.
D. reflected ray.

18. In which of the following materials is the velocity of light greatest?

A. Fused quartz
B. Air
C. Crown glass
D. Water

19. The bending of light as it passes into a transparent material of different optical intensity is known as

A. aberration.
B. reflection.
C. conversion.
End of exam
D. refraction.

20. An object is located 51 millimeters from a diverging lens. The object has a height of 13 millimeters and the image height is 3.5 millimeters. How far in front of the lens is the image located?

A. 1.12 millimeters
B. 13.7 millimeters
C. 51 millimeters
D. 189 millimeters

21. If a 72-candela light source is located at a distance of 3 meters from a surface, the illuminance on the surface is

A. 8 lux.
B. 648 lux.
C. 24 lux.
D. 216 lux.

22. Which of the following values represents an index of refraction of an actual material?

A. 1 / 2
B. 1 / 4
C. 5 / 4
D. 0

23. Which one of the following scientists did not study the properties of light?

A. Einstein
B. Newton
C. Kepler
D. Maxwell

24. Compared to yellow light, orange light has

A. a faster wave velocity.
B. the same frequency.
C. a different polarization.
D. a longer wavelength.

25. Reflecting telescopes are popular because they're

A. more durable than a refracting telescope.
B. easier to build than a refracting telescope.
C. more powerful than a refracting telescope.
D. smaller than a refracting telescope.

Topic: Electricity and Electronics

Questions 1 to 25: Select the best answer to each question. Note that a question and its answers may be split across a page break, so be sure that you have seen the entire question and all the answers before choosing an answer.

1. An example of an atom that has no charge is one that has

A. 3 protons, 2 electrons, and 1 neutron.
B. 1 proton, 2 electrons, and 3 neutrons.
C. 3 protons, 1 electron, and 3 neutrons.
D. 2 protons, 2 electrons, and 1 neutron.

2. In a cathode ray tube, the number of electrons that reach the fluorescent screen is controlled by the

A. deflecting plate.
B. anode.
C. grid.
D. cathode.

3. To use your left hand to determine the direction of the voltage developed in a moving conductor in a stationary magnetic field, you must point your

A. thumb in the direction of the magnetic flux.
B. forefinger in the direction of the lines of force.
C. thumb in the direction of the electromagnetic force.
D. forefinger in the direction of the motion.

4. The grid in a high-vacuum triode is usually kept negatively charged with respect to the cathode so that the electrons may be

A. accelerated toward the anode.
B. accelerated toward the cathode.
C. attracted to the cathode instead of the grid.
D. attracted to the anode instead of the grid.

5. Which of the following does not affect the electrical resistance of a body?

A. Bodies directly surrounding the body
B. Material composing the body
C. Length of the body
D. Temperature of the body

6. If the resistance of an electric circuit is 12 ohms and the voltage in the circuit is 60 V, the current flowing through the circuit is

A. 720 A.
B. 5 A.
C. 60 A.
D. 0.2 A.
The following question is based on the figure below.

 

7. If you want to stop the current flow through Device 3 in the circuit shown above, which one of the following single switches should you open?

A. Switch S3
B. Switch S2
C. Switch S5
D. Switch S4

8. A body that offers little resistance to the movement of free electrons from one point to another is a/an

A. capacitor.
B. conductor.
C. coulomb.
D. insulator.

9. If a bar of copper is brought near a magnet, the copper bar will be

A. unaffected by the magnet.
B. attracted by the magnet.
C. made into an induced magnet.
D. repelled by the magnet.

10. When an electric current flows through a long conductor, each free electron moves

A. from one end of the conductor to the other end.
B. with a speed of 300,000,000 m/s.
C. through a relatively short distance.
D. back and forth between the ends of the conductor.

11. A circuit contains two devices that are connected in parallel. If the resistance of one of these devices is 12 ohms and the resistance of the other device is 4 ohms, the total resistance of the two devices is

A. 0.333 ohms.
B. 16 ohms.
C. 0.0625 ohms.
D. 3 ohms.

12. The relationship between a cathode and an anode involves

A. electrons.
B. neutrons.
C. diodes.
D. protons.

13. The ability to regulate the amount of charge flowing in a circuit is

A. direct current.
B. alternating current.
C. voltage.
D. resistance.

14. A transmission system at a radio station uses a/an _______ to convert a direct current into a high frequency alternating current.

A. modulator
B. demodulator
C. oscillator
D. transmitting antenna

15. The magnitude of the voltage induced in a conductor moving through a stationary magnetic field depends on the _______ and the _______ of the conductor.

A. color, capacitance
B. resistance, current
C. distance, circumference
D. length, speed

16. What bias conditions must be present for the normal operation of a transistor amplifier?

A. Both junctions must be reverse biased.
B. The emitter-base junction must be reverse biased, and the collector-base junction must be forward biased.
C. The emitter-base junction must be forward biased, and the collector-base junction must be reverse biased.
D. Both junctions must be forward biased.

17. The unit for measuring electric power is the

A. volt.
B. ampere.
C. ohm.
D. watt.

18. If an electrically uncharged body is contacted by an electrically charged body, the uncharged body will

A. remain a neutrally charged body.
B. neutralize the charged body.
C. develop the same charge as the charged body.
D. develop the opposite charge as the charged body.

19. The part of the atom that accounts for electricity is the

A. nucleus.
B. electron.
C. proton.
D. neutron.

20. When all parts of a circuit are composed of conducting materials, the circuit is said to be

A. open.
B. parallel.
C. closed.
D. shorted.

21. A battery consists of five dry cells connected in series. If the voltage developed by each cell is 1.5 V, the total voltage developed by the battery is

A. 1.5 V.
B. 5.0 V.
C. 7.5 V.
D. 0.3 V.

22. When an electron is displaced in a semiconductor, the hole that's left behind is

A. incapable of carrying a charge.
B. considered an impurity in the crystal.
C. attracted to the anode of the voltage source.
D. attracted to the negative terminal of the voltage source.

23. A transformer has a primary voltage of 115 V and a secondary voltage of 24 V. If the number of turns End of exam in the primary is 345, how many turns are in the secondary?

A. 1,653
B. 72
C. 690
D. 8

24. Including a full-wave rectifier in an AC circuit will yield a(n) _______ current.

A. intermittent direct
B. continuous direct
C. intermittent alternating
D. continuous alternating

25. A complete circuit contains two parallel-connected devices and a generator for providing the electromotive force. The resistance of the first device is 12 ohms, the resistance of the second device is 4 ohms, and the voltage developed by the generator is 40 V. What is the magnitude of the current flowing through the first device?

A. 13.32 A
B. 10 A
C. 8 A
D. 3.33 A