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Question: Find all c in Z_3 such that Z_3[x]/(x^2 + c) is a field.
A. 0
B. 1
C. 2
D. 3
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 0 |
Question: Statement 1 | If aH is an element of a factor group, then |aH| divides |a|. Statement 2 | If H and K are subgroups of G then HK is a subgroup of G.
A. True, True
B. False, False
C. True, False
D. False, True
Answer: A
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 1 |
Question: Statement 1 | Every element of a group generates a cyclic subgroup of the group. Statement 2 | The symmetric group S_10 has 10 elements.
A. True, True
B. False, False
C. True, False
D. False, True
Answer: A
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 2 |
Question: Statement 1| Every function from a finite set onto itself must be one to one. Statement 2 | Every subgroup of an abelian group is abelian.
A. True, True
B. False, False
C. True, False
D. False, True
Answer: A
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 3 |
Question: Find the characteristic of the ring 2Z.
A. 0
B. 3
C. 12
D. 30
Answer: A
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 4 |
Question: What is the embryological origin of the hyoid bone?
A. The first pharyngeal arch
B. The first and second pharyngeal arches
C. The second pharyngeal arch
D. The second and third pharyngeal arches
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 0 |
Question: Which of these branches of the trigeminal nerve contain somatic motor processes?
A. The supraorbital nerve
B. The infraorbital nerve
C. The mental nerve
D. None of the above
Answer: C
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 1 |
Question: The pleura
A. have no sensory innervation.
B. are separated by a 2 mm space.
C. extend into the neck.
D. are composed of respiratory epithelium.
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 2 |
Question: In Angle's Class II Div 2 occlusion there is
A. excess overbite of the upper lateral incisors.
B. negative overjet of the upper central incisors.
C. excess overjet of the upper lateral incisors.
D. excess overjet of the upper central incisors.
Answer: C
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 3 |
Question: Which of the following is the body cavity that contains the pituitary gland?
A. Abdominal
B. Cranial
C. Pleural
D. Spinal
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 4 |
Question: You are pushing a truck along a road. Would it be easier to accelerate this truck on Mars? Why? (Assume there is no friction)
A. It would be harder since the truck is heavier on Mars.
B. It would be easier since the truck is lighter on Mars.
C. It would be harder since the truck is lighter on Mars.
D. It would be the same no matter where you are.
Answer: C
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 0 |
Question: Where do most short-period comets come from and how do we know?
A. The Kuiper belt; short period comets tend to be in the plane of the solar system just like the Kuiper belt.
B. The Kuiper belt; short period comets tend to come from random directions indicating a spherical distribution of comets called the Kuiper belt.
C. The asteroid belt; short period comets have orbital periods similar to asteroids like Vesta and are found in the plane of the solar system just like the asteroid belt.
D. The Oort cloud; short period comets tend to be in the plane of the solar system just like the Oort cloud.
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 1 |
Question: Say the pupil of your eye has a diameter of 5 mm and you have a telescope with an aperture of 50 cm. How much more light can the telescope gather than your eye?
A. 10000 times more
B. 100 times more
C. 1000 times more
D. 10 times more
Answer: C
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 2 |
Question: Why isn't there a planet where the asteroid belt is located?
A. A planet once formed here but it was broken apart by a catastrophic collision.
B. There was not enough material in this part of the solar nebula to form a planet.
C. There was too much rocky material to form a terrestrial planet but not enough gaseous material to form a jovian planet.
D. Resonance with Jupiter prevented material from collecting together to form a planet.
Answer: C
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 3 |
Question: Why is Mars red?
A. Because the surface is covered with heavily oxidized ("rusted") minerals.
B. Because the atmosphere scatters more light at bluer wavelengths transmitting mostly red light.
C. Because Mars is covered with ancient lava flows which are red in color.
D. Because flowing water on Mars's surface altered the surface minerals several billion years ago.
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 4 |
Question: Which of the following represents an accurate statement concerning arthropods?
A. They possess an exoskeleton composed primarily of peptidoglycan.
B. They possess an open circulatory system with a dorsal heart.
C. They are members of a biologically unsuccessful phylum incapable of exploiting diverse habitats and nutrition sources.
D. They lack paired, jointed appendages.
Answer: D
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 0 |
Question: In a given population, 1 out of every 400 people has a cancer caused by a completely recessive allele, b. Assuming the population is in Hardy-Weinberg equilibrium, which of the following is the expected proportion of individuals who carry the b allele but are not expected to develop the cancer?
A. 1/400
B. 19/400
C. 20/400
D. 38/400
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 1 |
Question: The presence of homologous structures in two different organisms, such as the humerus in the front limb of a human and a bird, indicates that
A. the human and bird are polyphyletic species
B. a human's and bird's evolution is convergent
C. the human and bird belong to a clade
D. the human and bird developed by analogy
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 2 |
Question: According to the pressure-flow model of movement of phloem contents, photosynthate movement from source to sink is driven by
A. an ATP-dependent pressure-flow pump
B. a water-pressure potential gradient
C. transpiration
D. apoplastic diffusion
Answer: A
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 3 |
Question: Which of the following contain DNA sequences required for the segregation of chromosomes in mitosis and meiosis?
A. Telomeres
B. Centromeres
C. Nucleosomes
D. Spliceosomes
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 4 |
Question: Which of the following statements about the lanthanide elements is NOT true?
A. The most common oxidation state for the lanthanide elements is +3.
B. Lanthanide complexes often have high coordination numbers (> 6).
C. All of the lanthanide elements react with aqueous acid to liberate hydrogen.
D. The atomic radii of the lanthanide elements increase across the period from La to Lu.
Answer: C
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 0 |
Question: A 0.217 g sample of HgO (molar mass = 217 g) reacts with excess iodide ions according to the reaction shown above. Titration of the resulting solution requires how many mL of 0.10 M HCl to reach equivalence point?
A. 1.0 mL
B. 10 mL
C. 20 mL
D. 50 mL
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 1 |
Question: Predict the number of lines in the EPR spectrum of a solution of 13C-labelled methyl radical (13CH3•), assuming the lines do not overlap.
A. 4
B. 3
C. 6
D. 24
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 2 |
Question: 3 Cl−(aq) + 4 CrO_4^2−(aq) + 23 H+(aq) → 3 HClO2(aq) + 4 Cr3+(aq) + 10 H2O(l). In the reaction shown above, Cl−(aq) behaves as
A. an acid
B. a base
C. a catalyst
D. a reducing agent
Answer: A
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 3 |
Question: Which of the following lists the hydrides of group-14 elements in order of thermal stability, from lowest to highest?
A. PbH4 < SnH4 < GeH4 < SiH4 < CH4
B. PbH4 < SnH4 < CH4 < GeH4 < SiH4
C. CH4 < SiH4 < GeH4 < SnH4 < PbH4
D. CH4 < PbH4 < GeH4 < SnH4 < SiH4
Answer: D
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 4 |
Question: Which of the following regular expressions is equivalent to (describes the same set of strings as) (a* + b)*(c + d)?
A. a*(c + d)+ b(c + d)
B. a*(c + d)* + b(c + d)*
C. a*(c + d)+ b*(c + d)
D. (a + b)*c +(a + b)*d
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 0 |
Question: A certain pipelined RISC machine has 8 general-purpose registers R0, R1, . . . , R7 and supports the following operations.
ADD Rs1, Rs2, Rd Add Rs1 to Rs2 and put the sum in Rd
MUL Rs1, Rs2, Rd Multiply Rs1 by Rs2 and put the product in Rd
An operation normally takes one cycle; however, an operation takes two cycles if it produces a result required by the immediately following operation in an operation sequence. Consider the expression AB + ABC + BC, where variables A, B, C are located in registers R0, R1, R2. If the contents of these three registers must not be modified, what is the minimum number of clock cycles required for an operation sequence that computes the value of AB + ABC + BC?
A. 5
B. 6
C. 7
D. 8
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 1 |
Question: The Singleton design pattern is used to guarantee that only a single instance of a class may be instantiated. Which of the following is (are) true of this design pattern?
I. The Singleton class has a static factory method to provide its instance.
II. The Singleton class can be a subclass of another class.
III. The Singleton class has a private constructor.
A. I only
B. II only
C. III only
D. I, II, and III
Answer: D
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 2 |
Question: A compiler generates code for the following assignment statement.
G := (A + B) * C - (D + E) * F
The target machine has a single accumulator and a single-address instruction set consisting of instructions load, store, add, subtract, and multiply. For the arithmetic operations, the left operand is taken from the accumulator and the result appears in the accumulator. The smallest possible number of instructions in the resulting code is
A. 5
B. 6
C. 7
D. 9
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 3 |
Question: Consider a computer design in which multiple processors, each with a private cache memory, share global memory using a single bus. This bus is the critical system resource. Each processor can execute one instruction every 500 nanoseconds as long as memory references are satisfied by its local cache. When a cache miss occurs, the processor is delayed for an additional 2,000 nanoseconds. During half of this additional delay, the bus is dedicated to serving the cache miss. During the other half, the processor cannot continue, but the bus is free to service requests from other processors. On average, each instruction requires 2 memory references. On average, cache misses occur on 1 percent of references. What proportion of the capacity of the bus would a single processor consume, ignoring delays due to competition from other processors?
A. 1/50
B. 1/27
C. 1/25
D. 2/27
Answer: D
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 4 |
Question: Let V be the set of all real polynomials p(x). Let transformations T, S be defined on V by T:p(x) -> xp(x) and S:p(x) -> p'(x) = d/dx p(x), and interpret (ST)(p(x)) as S(T(p(x))). Which of the following is true?
A. ST = 0
B. ST = T
C. ST = TS
D. ST - TS is the identity map of V onto itself.
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 0 |
Question: A tank initially contains a salt solution of 3 grams of salt dissolved in 100 liters of water. A salt solution containing 0.02 grams of salt per liter of water is sprayed into the tank at a rate of 4 liters per minute. The sprayed solution is continually mixed with the salt solution in the tank, and the mixture flows out of the tank at a rate of 4 liters per minute. If the mixing is instantaneous, how many grams of salt are in the tank after 100 minutes have elapsed?
A. 2
B. 2 - e^-2
C. 2 + e^-2
D. 2 + e^-4
Answer: A
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 1 |
Question: Let A be a real 2x2 matrix. Which of the following statements must be true?
I. All of the entries of A^2 are nonnegative.
II. The determinant of A^2 is nonnegative.
III. If A has two distinct eigenvalues, then A^2 has two distinct eigenvalues.
A. I only
B. II only
C. III only
D. II and III only
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 2 |
Question: Suppose that f(1 + x) = f(x) for all real x. If f is a polynomial and f(5) = 11, then f(15/2)
A. -11
B. 0
C. 11
D. 33/2
Answer: A
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 3 |
Question: Let A be the set of all ordered pairs of integers (m, n) such that 7m + 12n = 22. What is the greatest negative number in the set B = {m + n : (m, n) \in A}?
A. -5
B. -4
C. -3
D. -2
Answer: A
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 4 |
Question: A refracting telescope consists of two converging lenses separated by 100 cm. The eye-piece lens has a focal length of 20 cm. The angular magnification of the telescope is
A. 4
B. 5
C. 6
D. 20
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 0 |
Question: For which of the following thermodynamic processes is the increase in the internal energy of an ideal gas equal to the heat added to the gas?
A. Constant temperature
B. Constant volume
C. Constant pressure
D. Adiabatic
Answer: D
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 1 |
Question: One end of a Nichrome wire of length 2L and cross-sectional area A is attached to an end of another Nichrome wire of length L and cross- sectional area 2A. If the free end of the longer wire is at an electric potential of 8.0 volts, and the free end of the shorter wire is at an electric potential of 1.0 volt, the potential at the junction of the two wires is most nearly equal to
A. 2.4 V
B. 3.3 V
C. 4.5 V
D. 5.7 V
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 2 |
Question: A refracting telescope consists of two converging lenses separated by 100 cm. The eye-piece lens has a focal length of 20 cm. The angular magnification of the telescope is
A. 4
B. 5
C. 6
D. 20
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 3 |
Question: The muon decays with a characteristic lifetime of about 10^-6 second into an electron, a muon neutrino, and an electron antineutrino. The muon is forbidden from decaying into an electron and just a single neutrino by the law of conservation of
A. charge
B. mass
C. energy and momentum
D. lepton number
Answer: D
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 4 |
Question: SHA-1 has a message digest of
A. 160 bits
B. 512 bits
C. 628 bits
D. 820 bits
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 0 |
Question: _____________ can modify data on your system – so that your system doesn’t run correctly or you can no longer access specific data, or it may even ask for ransom in order to give your access.
A. IM – Trojans
B. Backdoor Trojans
C. Trojan-Downloader
D. Ransom Trojan
Answer: D
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 1 |
Question: What is ethical hacking?
A. "Hacking" ethics so they justify unintended selfish behavior
B. Hacking systems (e.g., during penetration testing) to expose vulnerabilities so they can be fixed, rather than exploited
C. Hacking into systems run by those whose ethics you disagree with
D. A slang term for rapid software development, e.g., as part of hackathons
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 2 |
Question: Exploitation of the Heartbleed bug permits
A. overwriting cryptographic keys in memory
B. a kind of code injection
C. a read outside bounds of a buffer
D. a format string attack
Answer: C
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 3 |
Question: The ____________ is anything which your search engine cannot search.
A. Haunted web
B. World Wide Web
C. Surface web
D. Deep Web
Answer: D
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 4 |
Question: Compared with the mass of a uranium atom undergoing fission, the combined masses of the products after fission are
A. less
B. more
C. the same
D. zero
Answer: A
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 0 |
Question: Things that are equivalent according to the equivalence principle are
A. space and time.
B. a traveling twin and a stay-at-home twin.
C. gravity and acceleration.
D. mass and energy.
Answer: D
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 1 |
Question: Colors in a soap bubble result from light
A. converted to a different frequency
B. deflection
C. interference
D. polarization
Answer: C
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 2 |
Question: A model airplane flies slower when flying into the wind and faster with wind at its back. When launched at right angles to the wind a cross wind its groundspeed compared with flying in still air is
A. the same
B. greater
C. less
D. either greater or less depending on wind speed
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 3 |
Question: Which of these three elements has the most mass per nucleon?
A. Hydrogen
B. Iron
C. Uranium
D. Same in each
Answer: C
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 4 |
Question: In an SR latch built from NOR gates, which condition is not allowed
A. S=0, R=0
B. S=0, R=1
C. S=1, R=0
D. S=1, R=1
Answer: A
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 0 |
Question: In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of conductors is 100. Find the total resistance
A. 200Ω
B. 100Ω
C. 50Ω
D. 10Ω
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 1 |
Question: The coil of a moving coil meter has 100 turns, is 40 mm long and 30 mm wide. The control torque is 240*10-6 N-m on full scale. If magnetic flux density is 1Wb/m2 range of meter is
A. 1 mA.
B. 2 mA.
C. 3 mA.
D. 4 mA.
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 2 |
Question: Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per meter of length of each conductor will be
A. 100 N.
B. 0.1 N.
C. 1 N.
D. 0.01 N.
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 3 |
Question: A point pole has a strength of 4π * 10^-4 weber. The force in newtons on a point pole of 4π * 1.5 * 10^-4 weber placed at a distance of 10 cm from it will be
A. 15 N.
B. 20 N.
C. 7.5 N.
D. 3.75 N.
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 4 |
Question: The population of the city where Michelle was born is 145,826. What is the value of the 5 in the number 145,826?
A. 5 thousands
B. 5 hundreds
C. 5 tens
D. 5 ones
Answer: D
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 0 |
Question: Olivia used the rule "Add 11" to create the number pattern shown below. 10, 21, 32, 43, 54 Which statement about the number pattern is true?
A. The 10th number in the pattern will be an even number.
B. The number pattern will never have two even numbers next to each other.
C. The next two numbers in the pattern will be an even number then an odd number.
D. If the number pattern started with an odd number then the pattern would have only odd numbers in it.
Answer: A
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 1 |
Question: A total of 30 players will play basketball at a park. There will be exactly 5 players on each team. Which statement correctly explains how to find the number of teams needed?
A. Add 5 to 30 to find 35 teams.
B. Divide 30 by 5 to find 6 teams.
C. Multiply 30 and 5 to find 150 teams.
D. Subtract 5 from 30 to find 25 teams.
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 2 |
Question: A store sells 107 different colors of paint. They have 25 cans of each color in storage. The number of cans of paint the store has in storage can be found using the expression below. 107 × 25. How many cans of paint does the store have in storage?
A. 749
B. 2,675
C. 2,945
D. 4,250
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 3 |
Question: Which expression is equivalent to 5 x 9?
A. (5 x 4) x (6 x 5)
B. (5 x 5) + (5 x 4)
C. (5 x 5) + (5 x 9)
D. (5 x 9) x (6 x 9)
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 4 |
Question: Which of the following is not a way to form recombinant DNA?
A. Translation
B. Conjugation
C. Specialized transduction
D. Transformation
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 0 |
Question: A mutation in a bacterial enzyme changed a previously polar amino acid into a nonpolar amino acid. This amino acid was located at a site distant from the enzyme’s active site. How might this mutation alter the enzyme’s substrate specificity?
A. By changing the enzyme’s pH optimum
B. By changing the enzyme’s location in the cell
C. By changing the shape of the protein
D. An amino acid change away from the active site cannot alter the enzyme’s substrate specificity.
Answer: D
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 1 |
Question: In animal cells, which of the following represents the most likely pathway that a secretory protein takes as it is synthesized in a cell?
A. Plasma membrane–Golgi apparatus–ribosome–secretory vesicle–rough ER
B. Ribosome–Golgi apparatus–rough ER–secretory vesicle–plasma membrane
C. Plasma membrane–Golgi apparatus–ribosome–secretory vesicle–rough ER
D. Ribosome–rough ER–Golgi apparatus–secretory vesicle–plasma membrane
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 2 |
Question: Which of the following is not known to be involved in the control of cell division?
A. Cyclins
B. Protein kinases
C. Checkpoints
D. Fibroblast cells
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 3 |
Question: Homologous structures are often cited as evidence for the process of natural selection. All of the following are examples of homologous structures EXCEPT
A. the wings of a bird and the wings of a bat
B. the flippers of a whale and the arms of a man
C. the pectoral fins of a porpoise and the flippers of a seal
D. the forelegs of an insect and the forelimbs of a dog
Answer: D
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 4 |
Question: Which of the following is considered an acid anhydride?
A. HCl
B. H2SO3
C. SO2
D. Al(NO3)3
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 0 |
Question: Which of the following is expected to be a polar molecule?
A. PCl4F
B. BF3
C. CO2
D. Si(CH3)4
Answer: A
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 1 |
Question: From the solubility rules, which of the following is true?
A. All chlorides, bromides, and iodides are soluble
B. All sulfates are soluble
C. All hydroxides are soluble
D. All ammonium-containing compounds are soluble
Answer: A
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 2 |
Question: A new compound is synthesized and found to be a monoprotic acid with a molar mass of 248 g/mol. When 0.0050 mol of this acid are dissolved in 0.500 L of water, the pH is measured as 3.89. What is the pKa of this acid?
A. 3.89
B. 7.78
C. 5.78
D. 2.33
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 3 |
Question: A solution contains 2.00 mole of acetic acid, CH3COOH, and 1.00 mole of calcium acetate, Ca(CH3COO)2. The solution is able to resist the addition of a small amount of strong acid or strong base with only minor changes in the pH of the solution. Larger quantities of strong acid or strong base can cause a significant change in pH. How many moles of nitric acid, HNO3, may be added before the pH begins to change significantly?
A. 0.500 mole
B. 1.00 mole
C. 2.00 mole
D. 3.00 mole
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 4 |
Question: Which of the following is an example of the use of a device on the Internet of Things (IoT) ?
A. A car alerts a driver that it is about to hit an object.
B. A hiker uses a G P S watch to keep track of her position.
C. A refrigerator orders milk from an online delivery service when the milk in the refrigerator is almost gone.
D. A runner uses a watch with optical sensors to monitor his heart rate.
Answer: C
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 0 |
Question: Many Web browsers allow users to open anonymous windows. During a browsing session in an anonymous window, the browser does not record a browsing history or a list of downloaded files. When the anonymous window is exited, cookies created during the session are deleted. Which of the following statements about browsing sessions in an anonymous window is true?
A. The activities of a user browsing in an anonymous window will not be visible to people who monitor the user's network, such as the system administrator.
B. Items placed in a Web store's shopping cart for future purchase during the anonymous browsing session will not be saved on the user's computer.
C. A user will not be able to log in to e-mail or social media accounts during the anonymous browsing session.
D. A user browsing in an anonymous window will be protected from viruses launched from any web sites visited or files downloaded.
Answer: A
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 1 |
Question: What is the output of "abc"[::-1] in Python 3?
A. Error
B. abc
C. cba
D. c
Answer: C
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 2 |
Question: In the program below, the initial value of x is 5 and the initial value of y is 10.
IF (X < O)
{
DISPLAY ("Foxtrot")
}
ELSE
{
IF (X > y)
{
DISPLAY ("Hotel")
}
ELSE
{
IF (y > O)
{
DISPLAY ("November")
}
ELSE
{
DISPLAY ("Yankee")
}
}
}
What is displayed as a result of running the program?
A. Foxtrot
B. Hotel
C. November
D. Yankee
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 3 |
Question: A list of numbers has n elements, indexed from 1 to n. The following algorithm is intended to display the number of elements in the list that have a value greater than 100. The algorithm uses the variables count and position. Steps 3 and 4 are missing.
Step 1: Set count to 0 and position to 1.
Step 2: If the value of the element at index position is greater
than 100, increase the value of count by 1.
Step 3: (missing step)
Step 4: (missing step)
Step 5: Display the value of count.
Which of the following could be used to replace steps 3 and 4 so that the algorithm works as intended?
A. Step 3: Increase the value of position by 1.
Step 4: Repeat steps 2 and 3 until the value of count is greater than 100.
B. Step 3: Increase the value of position by 1.
Step 4: Repeat steps 2 and 3 until t he value of position is greater than n.
C. Step 3: Repeat step 2 until the value of count is greater than 100.
Step 4: Increase the value of position by 1.
D. Step 3: Repeat step 2 until the value of position is greater than n.
Step 4: Increase the value of count by 1.
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 4 |
Question: Joe was in charge of lights for a dance. The red light blinks every two seconds, the yellow light every three seconds, and the blue light every five seconds. If we include the very beginning and very end of the dance, how many times during a seven minute dance will all the lights come on at the same time? (Assume that all three lights blink simultaneously at the very beginning of the dance.)
A. 3
B. 15
C. 6
D. 5
Answer: C
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 0 |
Question: Five thousand dollars compounded annually at an $x\%$ interest rate takes six years to double. At the same interest rate, how many years will it take $\$300$ to grow to $\$9600$?
A. 12
B. 1
C. 30
D. 5
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 1 |
Question: The variable $x$ varies directly as the square of $y$, and $y$ varies directly as the cube of $z$. If $x$ equals $-16$ when $z$ equals 2, what is the value of $x$ when $z$ equals $\frac{1}{2}$?
A. -1
B. 16
C. -\frac{1}{256}
D. \frac{1}{16}
Answer: A
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 2 |
Question: Simplify and write the result with a rational denominator: $$\sqrt{\sqrt[3]{\sqrt{\frac{1}{729}}}}$$
A. \frac{3\sqrt{3}}{3}
B. \frac{1}{3}
C. \sqrt{3}
D. \frac{\sqrt{3}}{3}
Answer: A
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 3 |
Question: Ten students take a biology test and receive the following scores: 45, 55, 50, 70, 65, 80, 40, 90, 70, 85. What is the mean of the students’ test scores?
A. 55
B. 60
C. 62
D. 65
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 4 |
Question: Which of the following conditions will ensure that angular momentum is conserved? I. Conservation of linear momentum II. Zero net external force III. Zero net external torque
A. I and II only
B. I and III only
C. II and III only
D. III only
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 0 |
Question: A pipe full of air is closed at one end. A standing wave is produced in the pipe, causing the pipe to sound a note. Which of the following is a correct statement about the wave’s properties at the closed end of the pipe?
A. The pressure is at a node, but the particle displacement is at an antinode.
B. The pressure is at an antinode, but the particle displacement is at a node.
C. The pressure and the particle displacement are both at nodes.
D. The pressure and the particle displacement are both at antinodes.
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 1 |
Question: A photocell of work function ϕ = 2eV is connected to a resistor in series. Light of frequency f = 1 × 10^15 Hz hits a metal plate of the photocell. If the power of the light is P = 100 W, what is the current through the resistor?
A. 2:00 AM
B. 6:00 AM
C. 12:00 AM
D. 24 A
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 2 |
Question: A microwave oven is connected to an outlet, 120 V, and draws a current of 2 amps. At what rate is energy being used by the microwave oven?
A. 10 W
B. 30 W
C. 60 W
D. 240 W
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 3 |
Question: A point charge, Q = +1 mC, is fixed at the origin. How much work is required to move a charge, Q = +8 µC, from the point (0, 4 meters) to the point (3 meters, 0)?
A. 3.5 J
B. 6.0 J
C. 22.5 J
D. 40 J
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 4 |
Question: Which of the following is a correct statement about correlation?
A. If the slope of the regression line is exactly 1, then the correlation is exactly 1.
B. If the correlation is 0, then the slope of the regression line is undefined.
C. Switching which variable is called x and which is called y changes the sign of the correlation.
D. The correlation r is equal to the slope of the regression line when z-scores for the y-variable are plotted against z-scores for the x-variable.
Answer: D
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 0 |
Question: Suppose X and Y are random variables with E(X) = 37, var(X) = 5, E(Y) = 62, and var(Y) = 12. What are the expected value and variance of the random variable X + Y?
A. E(X + Y) = 99, var(X + Y) = 8.5
B. E(X + Y) = 99, var(X + Y) = 13
C. E(X + Y) = 99, var(X + Y) = 17
D. There is insufficient information to answer this question.
Answer: A
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 1 |
Question: After a frost warning was issued, the owner of a large orange grove asked his workers to spray all his trees with water. The water was supposed to freeze and form a protective covering of ice around the orange blossom. Nevertheless, the owner suspected that some trees suffered considerable damage due to the frost. To estimate the proportion of trees that suffered more than 50 percent damage due to the frost, he took a random sample of 100 trees from his grove. What is the response variable in this experiment?
A. The proportion of trees that suffered more than 50 percent damage due to frost.
B. The number of trees affected by the frost.
C. The number of trees sampled from the grove.
D. For each sampled tree, whether it suffered more than 50 percent damage or at most 50 percent damage.
Answer: A
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 2 |
Question: A new smartwatch is manufactured in one part of a factory, then secured for shipping in another, independent part of the factory. The weight of the smartwatch has a mean of 62 grams and a standard deviation of 1.0 grams. The weight of the packaging (box, user's guide, bubble wrap, etc.) has a mean of 456 grams and a standard deviation of 6 grams. Together, the distribution of the weight of the smartwatch and its packaging would have the following mean and standard deviation:
A. Mean 518 grams; standard deviation 7.0 grams
B. Mean 518 grams; standard deviation 3.5 grams
C. Mean 518 grams; standard deviation 6.1 grams
D. Mean 394 grams; standard deviation 6.1 grams
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 3 |
Question: Which of the following sets has the smallest standard deviation? Which has the largest?
I: {1,2,3}
II: {-10,10}
III: {100}
A. I, II
B. II, III
C. III, I
D. III, II
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 4 |
Question: A 6-sided die is rolled 15 times and the results are: side 1 comes up 0 times; side 2: 1 time; side 3: 2 times; side 4: 3 times; side 5: 4 times; side 6: 5 times. Based on these results, what is the probability of side 3 coming up when using Add-1 Smoothing?
A. 2.0/15
B. 1.0/7
C. 3.0/16
D. 1.0/5
Answer: A
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 0 |
Question: Which image data augmentation is most common for natural images?
A. random crop and horizontal flip
B. random crop and vertical flip
C. posterization
D. dithering
Answer: A
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 1 |
Question: You are reviewing papers for the World’s Fanciest Machine Learning Conference, and you see submissions with the following claims. Which ones would you consider accepting?
A. My method achieves a training error lower than all previous methods!
B. My method achieves a test error lower than all previous methods! (Footnote: When regularisation parameter λ is chosen so as to minimise test error.)
C. My method achieves a test error lower than all previous methods! (Footnote: When regularisation parameter λ is chosen so as to minimise cross-validaton error.)
D. My method achieves a cross-validation error lower than all previous methods! (Footnote: When regularisation parameter λ is chosen so as to minimise cross-validaton error.)
Answer: D
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 2 |
Question: To achieve an 0/1 loss estimate that is less than 1 percent of the true 0/1 loss (with probability 95%), according to Hoeffding's inequality the IID test set must have how many examples?
A. around 10 examples
B. around 100 examples
C. between 100 and 500 examples
D. more than 1000 examples
Answer: A
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 3 |
Question: Traditionally, when we have a real-valued input attribute during decision-tree learning we consider a binary split according to whether the attribute is above or below some threshold. Pat suggests that instead we should just have a multiway split with one branch for each of the distinct values of the attribute. From the list below choose the single biggest problem with Pat’s suggestion:
A. It is too computationally expensive.
B. It would probably result in a decision tree that scores badly on the training set and a testset.
C. It would probably result in a decision tree that scores well on the training set but badly on a testset.
D. It would probably result in a decision tree that scores well on a testset but badly on a training set.
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 4 |
Question: Select the best translation into predicate logic: No people drive on Mars.
A. ~Pd
B. (∀x)(Px ∨ ~Dx)
C. (∀x)(Px ⊃ ~Dx)
D. ~Dp
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 0 |
Question: Select the best translation into predicate logic.George borrows Hector's lawnmower. (g: George; h: Hector; l: Hector's lawnmower; Bxyx: x borrows y from z)
A. Blgh
B. Bhlg
C. Bglh
D. Bghl
Answer: B
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 1 |
Question: Select the best English interpretation of the given arguments in predicate logic.
Dm
(∀x)(Wx ⊃ ~Dx)
(∀x)Wx ∨ Ag / (∃x)Ax
A. Marina is a dancer. Some weaklings are not dancers. Either everything is a weakling or Georgia plays volleyball. So something plays volleyball.
B. Marina is a dancer. No weakling is a dancer. Everything is either a weakling or plays volleyball. So something plays volleyball.
C. Marina is a dancer. Some weaklings are not dancers. Everything is either a weakling or plays volleyball. So something plays volleyball.
D. Marina is a dancer. No weakling is a dancer. Either everything is a weakling or Georgia plays volleyball. So something plays volleyball.
Answer: D
Question: Is the answer correct?
A. Yes
B. No
Answer: | A | 2 |
Question: Construct a complete truth table for the following pairs of propositions. Then, using the truth tables, determine whether the statements are logically equivalent or contradictory. If neither, determine whether they are consistent or inconsistent. Justify your answers.
E ⊃ (F · E) and ~E · F
A. Logically equivalent
B. Contradictory
C. Neither logically equivalent nor contradictory, but consistent
D. Inconsistent
Answer: A
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 3 |
Question: Which of the given formulas of PL is the best symbolization of the following sentence?
Turtles live long lives and are happy creatures, unless they are injured.
A. (L • H) ≡ I
B. (L • H) ∨ I
C. L • (H ∨ I)
D. L • (H ⊃ R)
Answer: C
Question: Is the answer correct?
A. Yes
B. No
Answer: | B | 4 |
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