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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Thomson’s plum pudding model shows the structure of what? A. nucleus B. DNA C. atom D. cell Answer:
C
sciq
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. An increase in what, across the periodic table, explains why elements go from metals to metalloids and then to nonmetals? A. protons B. neutrons C. temperature D. electrons Answer:
D
sciq
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What impact does humans changing animals habits have? A. inimical B. shameful C. positive D. happy Answer:
A
openbookqa
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What type of waves travel through the body of a planet? A. body waves B. gas waves C. energy waves D. vacuum waves Answer:
A
sciq
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Where would a greenhouse best be used? A. Bahamas B. Nebraska C. Florida D. Mexico Answer:
B
openbookqa
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Where is it most likely to rain? A. in the state of New Mexico B. at a seaside resort C. at a cabin in the desert D. on one's wedding day Answer:
B
openbookqa
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Tick the \textbf{true} assertion. In RSA \ldots A. \ldots decryption is known to be equivalent to factoring. B. \ldots key recovery is provably not equivalent to factoring). C. \ldots decryption...
A
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Let $\mathcal C_1$ be a linear code over $\mathbb F_3^n$, and let $\mathcal C_2$ be a linear code over $\mathbb F_2^n$. True or false: $\mathcal C_1 \cap \mathcal C_2$ is necessarily a linear co...
A
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. what can you find from an animal that indicates is used to live in that place? A. oceans B. limestone C. DNA D. bones E. food F. support G. h2o H. shells Answer:
D
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Human beings depend on learned behaviors more than any other? A. mammals B. Organisms C. Beings D. species Answer:
D
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. The group $\mathbb{Z}_{60}^*$ has \ldots A. 16 elements. B. 60 elements. C. 59 elements. D. 32 elements. Answer:
A
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. (Convex III) Let $f, g: \mathbb{R} \rightarrow \mathbb{R}$ be two convex functions. Then $h=f \circ g$ is always convex. A. True B. False Answer:
B
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Serious imbalances, cancer and other diseases can result when expression of what goes awry? A. gametes B. proteins C. ribosomes D. genes Answer:
D
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What are possible morphological analyses of "drinks"?(Penalty for wrong ticks) A. N+s B. drink+VERB+p C. drink+ADJ D. drink+N+p E. drink+VERB+3+Sing+Present+Indicative F. drinks+N+p Answer:
A
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Let $G$ be a set and $*$ a commutative operation on pairs of elements from $G.$ Suppose there exists an element $e\in G$ such that $a*e=e*a=a$ for all $a \in G.$ Also, suppose there exist elemen...
B
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Consider a public key cryptosystem. The channel used to transmit the public key has to be\dots A. \dots encrypted. B. \dots authenticated. C. \dots confidential. D. \dots authenticated and confi...
A
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. what have specialized reproductive organs A. flowers B. Conifers C. apples D. bushes E. insects F. ovaries G. Oak H. animals Answer:
D
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What can increase the amount of nutrients in the soil? A. roots B. wind C. worms D. Fungi E. Enzymes F. corn G. trees H. mussels Answer:
D
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Tick the \textbf{true} statement regarding RSA Cryptosystem. A. $(e,N,\varphi(N))$ are the public parameters. B. $e$ is a valid public key if $\gcd(e,N)=1$. C. Encryption and decryption are perf...
A
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. what do prokaryotes have? A. food B. rings C. alleles D. SO2 E. cilia F. alveoli G. nektar H. ovaries Answer:
E
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What term is used describe energy released during an earthquake? A. magnitude B. resonance C. seismic load D. blast Answer:
A
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What is a thick, dark brown or black liquid found in rock layers of the earth's crust? A. fossil fuel B. propane C. coal D. oil Answer:
D
sciq
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What can make the bottleneck effect occur in fish? A. increased habitat B. acid rain C. humans D. Winter E. increased food F. storms G. increased resources H. Toxicity Answer:
C
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Cactus store their liquids in their A. flowers B. lockers C. super market D. trunks Answer:
D
openbookqa
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What is the length in bits of the input and output of a DES S-Box respectively? A. 6 and 6 B. 4 and 6 C. 6 and 4 D. 4 and 4 Answer:
A
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Plants, algae and bacteria are all examples of what type of organism? A. unicellular B. microbes C. skeletal D. photosynthetic Answer:
D
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What grinds rocks over time? A. deltas B. erosion C. Time and energy D. weathering E. Echinoderm. F. deuterostomes G. amoebae H. bullfrogs Answer:
D
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What is caused by weathering? A. Water expanding B. fish C. loose dirt D. rainfall E. Rocks F. kale G. farms H. flooding Answer:
C
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What should I do to remain healthy A. Never move from my chair B. Never talk to anyone C. Eat burgers almost everyday D. Make sure to get some shut lids Answer:
D
openbookqa
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What role do proteins play in a biological reaction? A. antioxidants B. reverse hormones C. amino acid chains D. act as catalysts Answer:
D
sciq
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What do vertebrate chordates have? A. aerobic capacity B. primitive structures C. a spinal cord and nerves D. invertebrate structures E. Veins and arteries. F. cell walls G. characteristics H. p...
C
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. what is a prism used to refract? A. focusing a lens B. photons C. h2o D. glass E. oxygen F. rays or beams G. our nearest star H. an electron lens Answer:
F
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What is the branch of science that studies the physical world? A. botany B. social science C. physics D. Ecology Answer:
C
sciq
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Which of the following is true in the context of inverted files? A. Index merging compresses an inverted file index on disk and reduces the storage cost B. The trie structure used for index cons...
B
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. in order for the body to absorb nutrients, where does the food typically enter from? A. the mouth of the organism B. the skin of the organism C. the ear of the organism D. the anus of the organi...
A
openbookqa
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What are muscle cells in the muscles called? A. human fibers B. muscle fibers C. job fibers D. use fibers Answer:
B
sciq
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Which human body system system moves nutrients and other substances throughout the body? A. Muscular system B. Integumentary system C. Digestive system D. cardiovascular system Answer:
D
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. The amount of kinetic energy in a moving object depends directly on its mass and what else? A. direction B. volume C. density D. velocity Answer:
D
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What organelle contains the genetic material of the cell? A. nucleus B. gamete C. meiosis D. fetus Answer:
A
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Birds and insects perform what function for flowering plants? A. pollination B. vegetation C. irrigation D. condensation Answer:
A
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Tick the \textbf{incorrect} assertion. A. Solving the discrete logarithm in the group $\mathbb{Z}_N$ might help breaking the Rabin cryptosystem. B. Solving the factoring problem might help break...
A
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Let $p>2$ be a prime. Then \dots A. for any $x \in \mathbb{Z}_p^*$, we have $x^p \bmod{p} = 1$. B. the set of quadratic residues modulo $p$ form a field. C. the set of quadratic residues modulo ...
A
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Confidentiality means that: A. the message can be read by anyone. B. information should not leak to any unexpected party. C. the message should make clear who the author is. D. the information m...
A
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What requires nutrients to grow? A. birds B. metals C. computers D. dirt Answer:
A
openbookqa
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Which of the following circuits does not change an input difference. A. A XOR to a constant gate. B. An SBox. C. A shift of all bits by one position to the right. D. A non-linear circuit. Answer...
A
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. The force on a charged particle in a magnetic field is always perpendicular to both its velocity vector and the? A. gravity vector B. field vector C. position vector D. track vector Answer:
B
sciq
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What are sensitive to water quality? A. conditions B. salmon C. plants D. clams E. frost F. trout G. stones H. mussels Answer:
C
qasc
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. If an adversary mounts a chosen plaintext attack, it means he can\dots A. do nothing except for just observing the encrypted messages on the channel. B. ask the participants to decrypt any messa...
A
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. The test loss of logistic regression is always zero. A. TRUE B. FALSE Answer:
B
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What did Andrew and Fran have? A. support B. courtship C. Hail D. Snow E. Energy F. Shoes G. children H. food Answer:
E
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Precipitation and runoff can result in large bodies of what? A. drizzle B. erosion C. rain D. storm E. water F. hail G. liquid H. streams Answer:
E
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Viruses were assumed to exist before they were first seen with an electron microscope in which decade? A. 1960's B. 1940's C. 1890's D. 1930 ' s Answer:
D
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Earthworm bodies are: A. fertile B. segmented C. migrate D. allow growth E. revolving F. more abundant G. Loose H. Absorb light Answer:
B
qasc
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Tick the \textbf{true} assertion. A first preimage attack on a hash function H is \ldots A. \ldots given $x$ find $y$ such that $H(x)=y$ B. \ldots given $x$ find $x'\neq x$ such that $H(x)=H(x')...
A
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What are fungus-like protists? A. molds B. bacteria C. feces D. viruses Answer:
A
sciq
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Heat and light are forms of what, which refers to the ability to do work? A. waves B. fuel C. energy D. food Answer:
C
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What is the term for the smallest blood vessels? A. arteries B. Aortas C. capillaries D. muscles Answer:
C
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Something that shows that the earth changes is A. a city where a tree was B. a lake where a tree was C. a tree where a bird was D. a plant where a rock was Answer:
B
openbookqa
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Given this program snippet which is part of a large (> 10000 LoC) codebase, which of these statements are true, given that the contents of string "s" are attacker controlled, the attacke...
A
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Which would be the worst to wear out in a thunderstorm A. a large pair of rubber shoes B. a medallion made of plastic products C. a medallion made of ferrous metals D. a medallion made of crysta...
C
openbookqa
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What are materials that have a low resistance to electrical current called? A. electrical conductors B. resistors C. fast conductors D. electrons Answer:
A
sciq
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Consider an RSA encryption where the public key is published as $(m, e) = (35, 11)$. Which one of the following numbers is a valid decoding exponent? A. $11$ B. $7$ C. $5$ D. $17$ Answer:
A
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. what does electrocution cause harm to? A. cells B. pain C. amphibians D. animals E. Frogs F. electrons G. humans H. water Answer:
D
qasc
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Tapeworms are what type of flatworms? A. single-celled B. symbiotic C. endogenous D. parasitic Answer:
D
sciq
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. For each of the sub-questions of this question (next page), tick/check the corresponding box if the presented sentence is correct at the corresponding level (for a human). There will be a penalt...
A
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. In many cases, the alkali metal amide salt (mnh2) is not very soluble in liquid ammonia and does what? A. isolates B. evaporates C. precipitates D. settles Answer:
C
sciq
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Under certain conditions, maximizing the log-likelihood is equivalent to minimizing mean-squared error for linear regression. The mean-squared error can be defined as $\mathcal{L}_{m s e}(\mathb...
A
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. To reproduce, mammals attract a mate through what? A. Smell B. genes C. saliva D. eggs E. sex F. gametes G. fur H. warmth Answer:
A
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Why can amphibians easily absorb toxins? A. salamanders B. permeable skin C. hydrate their cells D. it needs them E. poisonous frogs F. Pesticides G. cold blooded H. bending light rays Answer:
B
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. what senses differences in temperature or pain? A. h2o B. the body's largest organ C. dead nerve cells D. Electric devices E. heat F. the skin G. sensory neurons H. mechanoreceptors Answer:
H
qasc
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What is the difference between C++'s \texttt{static\_cast} and \texttt{dynamic\_cast}? A. \texttt{static\_cast} does not perform any kind of runtime check, while \texttt{dynamic\_cast} performs ...
A
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What is the term for when clumped solids sink to the bottom of the water? A. sedimentation B. Foundation C. Clumping D. sediment Answer:
A
sciq
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Monatomic ions have an oxidation number equal to their what? A. charge B. cost C. length D. size Answer:
A
sciq
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Blood flows into the kidney through which artery? A. blood artery B. renal artery C. pulminary artery D. main artery Answer:
B
sciq
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What type of proteins are only temporarily associated with the membrane? A. sensitive rod proteins B. peripheral oxidation proteins C. peripheral membrane proteins D. visual membrane proteins An...
C
sciq
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Do the functions first and second return the same output for every possible input? def first(x: List[Int]): Int = x.head + first(x.tail) def second(x: List[Int]): Int = x.foldLeft(0)(_ + _) A. Y...
B
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Ovulation takes place in what organ and is part of the menstrual cycle? A. testes B. ovary C. fallopian tube D. uterus Answer:
B
sciq
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Plants cell walls are made of A. fiber B. keratin C. alveoli D. cations E. matter F. CO 2 G. porous H. Cane. Answer:
A
qasc
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What scientist constructed a tree diagram, separating living organisms into three domains? A. CT Fletcher B. Mendel C. Gibbs D. carl woese Answer:
D
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. The Time-Memory Tradeoff Attack ... A. is useful for finding a preimage within complexity $O\big(\big({\frac{2}{3}}\big)^N\big).$ B. is useful for finding a preimage within complexity $O(N^{\fra...
A
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. The test loss of the 1-nearest neighbor classifier is always zero. A. TRUE B. FALSE Answer:
B
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Tick the \emph{correct} assertion regarding GSM. A. In GSM, the communication is always encrypted. B. The integrity of GSM messages is well protected. C. GSM uses the GSME cipher to encrypt mess...
A
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Eyes are used by animals for seeing by sensing what? A. focusing a lens B. an electron microscope C. objects that have mass D. chemical messengers E. basic building blocks of life F. electromagn...
F
qasc
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. The period immediately following the transmission of an impulse in a nerve or muscle, in which a neuron or muscle cell regains its ability to transmit another impulse, is called the ______ perio...
B
sciq
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Given the distribution $P_0$ of a normal coin, i.e. $P_0(0)=P_0(1)=\frac{1}{2}$, and distribution $P_1$ of a biased coin, where $P_1(0)=\frac{1}{3}$ and $P_1(1) = \frac{2}{3}$ , the maximal adva...
A
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. The second leading cause of death is a disease in which A. immunities are destroyed B. an area swollen with pus C. plague clogs arteries D. deadly and devastating E. cause people to become sick....
G
qasc
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. A fully developed placenta is made up of a large mass of what? A. plant cells B. brain tissues C. blood vessels D. estrogen hormones Answer:
C
sciq
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What is the speed of the change in the characteristics of living things over time? A. Jet speed. B. Speed of light. C. long D. Slow. E. Mach speeds. F. slows G. speed H. years Answer:
D
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Let $n$ be a positive integer. The Fermat test most likely outputs ``prime'' \dots A. only when $n$ is prime. B. only when $n$ is non-prime. C. when $n$ is prime or when $n$ is not a Carmichael ...
A
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What is capable of altering the rate of time passing? A. strong gravitational fields B. strong magnetic fields C. strong planetary fields D. weak gravitational fields Answer:
A
sciq
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. A person wanting to avoid polluting the air will, when considering vehicles, choose A. a four-wheeler B. a truck C. a convertible D. a tricycle Answer:
D
openbookqa
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. The cytoplasm is all the contents of the cell inside the cell membrane, with the exception of what? A. molecules B. nucleus C. vacuole D. lysosome Answer:
B
sciq
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. transpiration happens in the leaves of what? A. rocks B. shrubbery C. cars D. animals Answer:
B
openbookqa
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What does a desert environment receive less of than a forest? A. visitors B. H2O fall C. wind D. recognition Answer:
B
openbookqa
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Because of the stem of plants, they are able to do what in the soil A. fly B. balance upright C. cry D. sing Answer:
B
openbookqa
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Where can one readily see the geologic history of an area? A. down B. scuba diving C. soils D. pastureland E. canyon F. driving G. Mountains H. mines Answer:
E
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The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What does gasoline release when it separates? A. kinetic energy B. heat energy C. Organic compounds D. Decrease bodily water E. water vapor F. Chemical energy G. hydrogen and oxygen H. carbon di...
C
qasc
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Which of the following congruence classes has a multiplicative inverse? A. $[3^{10} 2^5 14]_{19}$ B. $[126]_{147}$ C. $[60]_{15}$ Answer:
A
m1_preference
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. What is the term for the blockage of an artery by the buildup of fatty plaques? A. cancers B. atherosclerosis C. fibrosis D. clumps Answer:
B
sciq
The following are multiple choice questions (with answers) about knowledge and skills in advanced master-level STEM courses. Which of the following could make more people want to wear masks? A. A bicycle race with hundreds of participants B. the use of electric lawn mowers C. contaminated hamburger meat from the groce...
D
openbookqa