problem stringlengths 14 4.09k | solution stringlengths 1 802k | task_type stringclasses 3
values | problem_tokens int64 5 895 |
|---|---|---|---|
The following is a multiple choice question (with answers).
===Question
A galvanometer of resistance $100\Omega$ has $50$ divisions on its scale and has sensitivity of $20 \mu \ A$/division. It is to be converted to a voltmeter with three ranges, of $0-2 V, 0-10 V$ and $0-20 V$. The appropriate circuit to do so is :
=... | $$R_1 = 1900 \Omega$$
$$R_2 = 8000 \Omega$$
$$R_3 = 10000 \Omega$$ | general_qa | 324 |
The following is a multiple choice question (with answers).
===Question
In a certain gaseous reaction between $X$ and $Y$, $X+3Y\rightarrow X{Y}_{3}$. The initial rates are reported as follows-$[X]$$[Y]$Rate$0.1\ M$$0.1\ M$$0.002\ M{s}^{-1}$$0.2\ M$$0.1\ M$$0.002\ M{s}^{-1}$$0.3\ M$$0.2\ M$$0.008\ M{s}^{-1}$$0.4\ M$$0.... | $$r={[X]}^{o}{[Y]}^{3}$$ | general_qa | 331 |
The following is a multiple choice question (with answers).
===Question
Take a 2.00 ml sample solution of chloroethanol ($\mathrm{C_{2}H_{4}ClOH}$) and $\mathrm{HCl}$ in an Erlenmeyer flask, add $\mathrm{NaOH}$ and heat to convert organic chlorine into inorganic $\mathrm{Cl^{-}}$. In this acidic solution, add 30.05 ml ... | $$
7 0. 1 \%
$$ | general_qa | 398 |
The following is a multiple choice question (with answers).
===Question
A capacitor is initially connected to a battery of EMF $3$V. At $t=0$, switch is thrown to B state. Now charge on capacitor at any instant is given by.
===Choices
$$q=C(V-2V e^{-t/2RC})$$
$$q=C(V-2V e^{-t/RC})$$
q=C(V+2V e^{-t/RC})
$$q=C(V+2V e^{-... | $$q=C(V+2V e^{-t/2RC})$$ | general_qa | 171 |
The following is a multiple choice question (with answers).
===Question
In a certain irrigation district, wheat is planted, with an irrigation quota of $\mathrm{m=50 m^{3}/}$ mu, and the infiltration rate is moderate. From soil infiltration test data, it is known that the average infiltration rate within the first hour... | $$
5. 8 3 \ \mathrm{L} / ( \mathrm{s} \cdot\mathrm{m} )
$$ | general_qa | 449 |
The following is a multiple choice question (with answers).
===Question
Primigravida, 24 years old, 39 weeks pregnant, with normal appetite, was admitted to the hospital with abdominal paroxysm from 20:00 last night, and stayed awake all night after admission, this morning's checkup saw her mental fatigue, contractions... | pethidine 100mg intramuscular | general_qa | 269 |
The following is a multiple choice question (with answers).
===Question
What is included in the quaternary structure of proteins?
===Choices
The quaternary structure of a protein features multiple independent, unattached polypeptide sequences.
The quaternary structure of a protein contains two or more polypeptide chai... | The quaternary structure of a protein contains two or more polypeptide chains, all of which are folded into alpha-helices. | general_qa | 235 |
The following is a multiple choice question (with answers).
===Question
When there is little or no personal contact between customer and service provider, this is classified as:
===Choices
Low-contact service.
Remote-contact service.
High-contact service.
Minimal-contact service.
Zero-contact service.
Non-personal ser... | Low-contact service. | general_qa | 80 |
The following is a multiple choice question (with answers).
===Question
Determine the possible minimum solubility of nitrogen or other elements in molten iron standing under high vacuum. Temperature 1873 $\mathrm{K}$ iron's vapor pressure $p_{\mathrm{Fe}}^{*} \,=\, 5.89 \mathrm{Pa}$.
===Choices
$$
3. 4 8 \times1 0^{-3... | $$
1. 2 6 \times1 0^{-4} \%
$$ | general_qa | 279 |
The following is a multiple choice question (with answers).
===Question
Compute the integral:
$$
\int \frac{ \sqrt{4+x^2} }{ x } \, dx
$$
===Choices
C + \sqrt{4 + x^2} + \ln\left(\left|\frac{\sqrt{4 + x^2} + 2}{2 + \sqrt{4 + x^2}}\right|\right)
C + \sqrt{4 + x^2} + \ln\left(\left|\frac{\sqrt{4 + x^2} + 2}{2 - \sqrt{4 ... | C + \sqrt{4 + x^2} + \ln\left(\left|\frac{\sqrt{4 + x^2} - 2}{2 + \sqrt{4 + x^2}}\right|\right) | general_qa | 242 |
The following is a multiple choice question (with answers).
===Question
When the charterer and the shipowner stipulate the loading and unloading time, which of the following is favorable to the charterer but unfavorable to the shipowner?
===Choices
Calculated by cumulative 48-hour working days
Calculated by working ho... | Calculated by consecutive 24-hour good weather working days | general_qa | 151 |
The following is a multiple choice question (with answers).
===Question
Experiments show that the retractive force $f$ of polymeric elastomers as a function of tem- perature $T$ and expansion $L$ is approximately given by $f ( T, L )=a T ( L-L_{0} )$ where $a$ and $L_{0}$ are constants.
Use Maxwell relations to determi... | $$
S ( L )=\frac{-a ( L-L_{0} )^{2}} {2}
$$ | general_qa | 369 |
The following is a multiple choice question (with answers).
===Question
What is the temperature maintained in the Hall-Heroult process?
===Choices
850°-950° C
850°-890° C
870°-910° C
960°-1000° C
970°-1010° C
820°-860° C
940°-980° C
910°-950° C
880°-920° C
930°-970° C | 940°-980° C | general_qa | 142 |
The following is a multiple choice question (with answers).
===Question
From the biological standard half-cell potentials $E^{\oplus} ( \mathrm{O}_{2}, \mathrm{H}^{+}, \mathrm{H}_{2} \mathrm{O} )=+0. 8 2 \mathrm{V}$ and $E^{\oplus} ( \mathrm{N A D H^{+}, H^{+}, N A D H} )=-0. 3 2 \, \mathrm{V},$ calculate the standard ... | $$
{-4 4 0 \mathrm{~ k J ~ m o l^{-1}}}
$$ | general_qa | 371 |
The following is a multiple choice question (with answers).
===Question
In the float procession of a flower parade, there is a float with a front emblem shaped approximately like a disk with a diameter of $d = 2.0$ m. The float moves at a speed of 12.6 km/h against a headwind of 3 m/s. The local atmospheric temperature... | $$
3 3 4. 5 \mathbf{W}
$$ | general_qa | 291 |
The following is a multiple choice question (with answers).
===Question
We now define an algorithm: The definition of a(n) is the sequence of denominators obtained by listing the positive rational numbers less than or equal to 1 in simplest form with denominators in increasing order. Given the input x_list (a series of... | [15, 15, 15, 15, 16, 16, 16, 16, 16, 16] | general_qa | 518 |
The following is a multiple choice question (with answers).
===Question
A certain retaining wall has a height of 10.0m, with a vertical and smooth back face, and a horizontal fill surface behind the wall. A uniform load $q = 20 \mathrm{kPa}$ acts on the fill. The fill consists of two layers: the upper layer is medium s... | $$
3 1 5 \mathrm{k N / m}
$$
$$
80 \mathrm{k N / m}
$$ | general_qa | 541 |
The following is a multiple choice question (with answers).
===Question
What characterizes the geometric composition of a stationary structure?
===Choices
Geometrically consistent frameworks without additional constraints
Geometrically strict configurations without necessary constraints
Geometrically uniform designs w... | Geometrically invariant systems without redundant constraints | general_qa | 118 |
The following is a multiple choice question (with answers).
===Question
A pn junction diode is used as a voltage-controlled capacitor (varactor). When the reverse bias voltage is 2V, its variable capacitance is 200pF. Assuming the contact potential is 0.85V. What reverse bias voltage is needed to reduce its capacitance... | $$
1 0. 6 ( \mathrm{V} )
$$ | general_qa | 255 |
The following is a multiple choice question (with answers).
===Question
Consider the set B* of all strings over the alphabet set B = {0, 1} with the concatenation operator for strings ________
===Choices
forms a non-commutative group
needs additional mapping rules
does not form a group
does not have the right identity... | does not form a group | general_qa | 113 |
The following is a multiple choice question (with answers).
===Question
A bubble with a radius $a$ equal to 0.1 cm undergoes harmonic pulsation at its natural frequency in water at 20°C, with a surface amplitude of $\xi_{0} \,=\, 0.01 \, a$. Try to calculate the radiation power of the bubble.
===Choices
$$
6. 9 8 \tim... | $$
7. 9 8 \times1 0^{-5} {\mathrm{~ W}}
$$ | general_qa | 321 |
The following is a multiple choice question (with answers).
===Question
The distribution of certain soft soil foundation layers and each soil layer is known, with a foundation burial depth of 2.0m. A composite foundation with mixing piles is adopted, with the mixing pile length being $10.0 \mathrm{m}$, pile diameter 50... | 0.85m | general_qa | 203 |
The following is a multiple choice question (with answers).
===Question
When coastal Kelvin waves are in the Northern Hemisphere, which side do they always have the widest amplitude?
===Choices
Back side
Bottom side
Right side
Left side
Top side
Front side | Right side | general_qa | 54 |
The following is a multiple choice question (with answers).
===Question
What stage of chemical weathering is referred to as the phase in which chemical weathering dominates, with massive migration of Si and relative enrichment of A1?
===Choices
Final stage
Early stage
Transitional phase
Intermediate period
Late stage
... | Late stage | general_qa | 79 |
The following is a multiple choice question (with answers).
===Question
In geochemistry, which of the following elements has an important impact on global climate change?
===Choices
Carbon Dioxide
Hydrogen
Sulfur
Silicon
Magnesium
Oxygen
Nitrogen
Phosphorus
Carbon
Aluminum | Carbon | general_qa | 67 |
The following is a multiple choice question (with answers).
===Question
Rubber cells are located in the branches and leaves of Eucommia ulmoides( ).
===Choices
In the cambium layer
In the cortex
In the root hairs
Epidermis
In the phloem
In the epidermal cells
In the vascular bundle
In the leaf veins
In the stomata
In ... | In the phloem | general_qa | 88 |
The following is a multiple choice question (with answers).
===Question
Air flows out of the storage tank, with an internal pressure of Pa and a temperature of 288K. Given that the flow at the outlet is subsonic and the pressure is Pa, the outlet velocity is ____ m/s.
===Choices
250.6
252.6
251.6
248.6
256.6
247.6
253... | 251.6 | general_qa | 125 |
The following is a multiple choice question (with answers).
===Question
Variable worm gearing changes only the dimensions of (), while the dimensions of () remain unchanged.
===Choices
Worm wheel, worm gear
Worm gear, worm wheel
Chain, Sprocket
Bearings, Gears
Gear ring, bearings
Gear ring, chain
Gear, Gear Ring
Sproc... | Worm gear, worm wheel | general_qa | 91 |
The following is a multiple choice question (with answers).
===Question
The magnetic compass needle of the compass is arranged ________ to the NS axis of the compass scale.
===Choices
Asymmetrically Perpendicular
Equally Aligned
Symmetrically Parallel
Perpendicular
Asymmetrically Parallel
Symmetrically Perpendicular
I... | Symmetrically Parallel | general_qa | 78 |
The following is a multiple choice question (with answers).
===Question
To beaker containing $ 0.1 M \ HCl,$ a little pure solid AgCl is added. Both a silver and a hydrogen electrode $ (P_{H_{2}} = 1.0 $ bar) are then placed in the solution. What is the approximate value of EMF measured between the electrodes at $ 25^{... | 0.32 V | general_qa | 194 |
The following is a multiple choice question (with answers).
===Question
In putrefaction greenish discolouration is first seen in -
===Choices
Left iliac fossa
Loin
Abdomen
Upper limb
Epigastrium
Right iliac fossa
Lower limb | Right iliac fossa | general_qa | 60 |
The following is a multiple choice question (with answers).
===Question
$1$ mole of an ideal gas $\left( { C }_{ V }=12.55J{ K }^{ -1 }{ mol }^{ -1 } \right) $ at $300K$ compressed adiabatically and reversibly to one-fourth of its original volume. What is the final temperature of the gas?
===Choices
$$757 K$$
$$751 K$... | $$750 K$$ | general_qa | 154 |
The following is a multiple choice question (with answers).
===Question
The maximum speed with which a car can cross a convex bridge over a river with a radius of curvature 9.2 m is (centre of gravity of the car is 1 m above the bridge and g = 9.8 $m/s^2$)
===Choices
25 m/s
30 m/s
10 m/s
48 m/s
40 m/s
45 m/s
47 m/s
20... | 25 m/s | general_qa | 120 |
The following is a multiple choice question (with answers).
===Question
() is a multinucleate single-celled bacterium, only the nucleus divides, there is no increase in the number of cells.
===Choices
Multinucleate filamentous algae
Multinucleate unicellular green algae
Single-celled multinucleate cyanobacteria
Unicel... | Non-septate mycelium | general_qa | 122 |
The following is a multiple choice question (with answers).
===Question
Trade unions should weaken the constraints and strive to achieve ().
===Choices
decreasing the number of high-skilled workers
increasing the social demand for products
increasing the labor supply elasticity of wages
increasing the wage elasticity ... | reducing the wage elasticity of labor demand | general_qa | 120 |
The following is a multiple choice question (with answers).
===Question
From the late __ to the early __, the global continents drifted together to form a globally unified huge united continent (Pan-Continent), surrounded by the Pan-Ocean.
===Choices
Carboniferous Triassic
Jurassic Cretaceous
Permian Carboniferous
Per... | Permian Triassic | general_qa | 104 |
The following is a multiple choice question (with answers).
===Question
Estein Barr (EB) virus has been implicated in the following malignancies except -
===Choices
Burkitt's lymphoma
Chronic myeloid leukemia
Chronic lymphocytic leukemia
Multiple myeloma
Non Hodgkin's lymphoma
Hodgkin's disease
Nasopharyngeal carcinom... | Multiple myeloma | general_qa | 88 |
The following is a multiple choice question (with answers).
===Question
The replication start ori of the BR322 plasmid is derived from ().
===Choices
Low-density type replication origin point for the RSF1030 group (sourced from R1)
High-copy type replication starting point for the pMB1 family (derived from ColE1)
High... | High-copy type replication starting point for the pMB1 family (derived from ColE1) | general_qa | 244 |
The following is a multiple choice question (with answers).
===Question
What will be density ( in $g\ { mL }^{ -1 }$) of 3.60 molar sulphuric acid having 29% by mass?$(Molar\ mass\ =\ 98\ g\ { mL }^{ -1 })$
===Choices
1.76
1.72
1.53
1.92
1.84
1.69
1.64
1.45
1.22
1.88 | 1.88 | general_qa | 126 |
The following is a multiple choice question (with answers).
===Question
What is the device with a double-layer reaction zone in an anaerobic reactor?
===Choices
EGSB
UASB
Rotating Biological Contactor
Anaerobic Baffled Reactor
Fluidized Bed Reactor
Fixed Film Reactor
IC Reactor
Hybrid Reactor
Anaerobic Filter
Upflow R... | IC Reactor | general_qa | 85 |
The following is a multiple choice question (with answers).
===Question
Let the solubilities of $AgCl$ in water, in $0.01M CaCl_2$,in $0.01M NaCl$ and $0.05M AgNo_3$ be $S_1,S_2,S_3$ and $S_4$ respectively. Which of the following relationship between these quantities is correct?
===Choices
$$S_4 > S_2, > S_3 > S_1$$
$... | $$S_1 > S_2, > S_3 > S_4$$ | general_qa | 227 |
The following is a multiple choice question (with answers).
===Question
What is the cross and parallel air delivery system applicable to?
===Choices
Eight hot blast stoves
Four hot blast stoves
Two hot blast stoves
Seven hot blast stoves
Single hot blast stove
Three hot blast stoves
Ten hot blast stoves
Five hot blast... | Four hot blast stoves | general_qa | 87 |
The following is a multiple choice question (with answers).
===Question
The speed of sound in the sea surface is 1500 m/s, with a 60 m thick isothermal layer at the surface, and below it is a steep negative temperature gradient layer. Assuming a submarine is located just below the isothermal layer, find the minimum hor... | 3.32km | general_qa | 146 |
The following is a multiple choice question (with answers).
===Question
An ammeter and a voltmeter are connected in series to a battery with an emf $arepsilon=6.0 \ V$. When a certain resistance is connected in parallel with the voltmeter, the reading of the voltmeter decreases $2.0\ times$, whereas the reading of the ... | $$4V$$ | general_qa | 141 |
The following is a multiple choice question (with answers).
===Question
A cylindrical disturbed saturated clay sample, after being consolidated under a surrounding pressure of 100 kPa, is subjected to axial pressure for undrained shear until the sample fails. The pore water pressure coefficient at failure is measured a... | 15.4° | general_qa | 201 |
The following is a multiple choice question (with answers).
===Question
A body of mass $M\ kg$ is on the top of a smooth hemisphere of radius $5\ m.$ It is released to slide down the surface of the hemisphere.It leaves the surface when its velocity is $5\ m/s.$ At this instant the angle made by the radius vector of the... | $$45^\circ$$ | general_qa | 158 |
The following is a multiple choice question (with answers).
===Question
Consider two 5 year bonds: one has a 9% coupon and sells for 101.00; the other has a 7% coupon and sells for 93.20. What is the price of a 5-year zero-coupon bond.
===Choices
72.8
70.3
65.9
80.2
75.6
68.2
85.0
83.7
78.4
60.5 | 65.9 | general_qa | 123 |
The following is a multiple choice question (with answers).
===Question
Rising springs can be classified based on their origins into erosional rising springs, ____ and _____.
===Choices
volcanic springs, sediment springs
thermal springs, fracture springs
plateau springs, valley springs
geothermal spring, rock layer sp... | fault spring, contact zone spring | general_qa | 112 |
The following is a multiple choice question (with answers).
===Question
The periodic potential field of a two-dimensional square lattice can be expressed as follows: $$ V \left( {\bf x}, {\bf y} \right)=-4 U \operatorname{c o s} \left( \frac{2 \pi} {a} x \right) \operatorname{c o s} \left( \frac{2 \pi} {a} y \right) $$... | 2U | general_qa | 186 |
The following is a multiple choice question (with answers).
===Question
During the blowing process in a 300-ton pure oxygen top-blown converter, high-phosphorus hot metal is introduced, and the dephosphorization process is limited by the diffusion of $\mathrm{P}_{2} \mathrm{O}_{5}$ in the slag. Calculate the rate of de... | $$
4. 6 5 \times1 0^{-4} \% / \mathrm{s},148.89s
$$ | general_qa | 611 |
The following is a multiple choice question (with answers).
===Question
"In the art of war, to subdue the enemy without fighting is the supreme excellence. To win one hundred victories in one hundred battles is not the highest skill; to subdue the enemy without fighting is the highest skill." This passage mainly embodi... | Complete Victory | general_qa | 116 |
The following is a multiple choice question (with answers).
===Question
The radius of Mars is half of Earth's radius, and its mass is $1/9$ of Earth's mass. An astronaut has a mass of $72 \mathbf{kg}$. What is the gravitational force acting on him on Mars? The astronaut can lift a maximum weight of $100 \mathbf{kg}$ on... | 320N, 225kg | general_qa | 210 |
The following is a multiple choice question (with answers).
===Question
A type of solid heat storage device uses solar energy to heat rocks for thermal storage, with the rock temperature reaching $400 \mathrm{K}$. There is currently a rock bed with a volume of $2 \ \mathrm{m}^{3}$, where the rock density is $\rho = 275... | $$
81946.0 \mathrm{k J}
$$ | general_qa | 307 |
The following is a multiple choice question (with answers).
===Question
The density of woven fabric is the number of yarns within a unit length of the fabric. The unit length is ( ).
===Choices
17cm
20cm
19cm
10cm
15cm
8cm
16cm
30cm
24cm
50cm | 10cm | general_qa | 80 |
The following is a multiple choice question (with answers).
===Question
An uniform disk with mass $m$ and radius $R$ is placed on a rough horizontal table. It rotates around a vertical axis through its center with an initial angular velocity $\omega_{o}$. Given that the coefficient of friction between the disk and the ... | $$
\frac{3 \omega_{0} R} {4 \mu g}
$$ | general_qa | 301 |
The following is a multiple choice question (with answers).
===Question
Which of the following choices is sign of vitality in burn deaths?
===Choices
Heat Exposure, Thermal Injury, Heat Resistance
Fire Residue Contact, Flame Damage, Fire Resistance
Heat Contact, Burn Trauma, Thermal Absorption
Smoke Intake, Respirator... | Soot Particle Inhalation, Inhalation Trauma, Soot Particle Ingestion | general_qa | 156 |
The following is a multiple choice question (with answers).
===Question
What is the page replacement algorithm commonly used in request page management?
===Choices
Last-In-First-Out, Most Recently Used
Primary-Chance, Least Often Used
Random-Selection, Seldomly Used
Second-Chance, Least Frequently Used
First-Out-First... | First-In-First-Out, Least Recently Used | general_qa | 119 |
The following is a multiple choice question (with answers).
===Question
What type of front occurs when a cold air mass meets and overtakes a warm air mass?
===Choices
Cold air boundary
Cold pressure front
High-pressure ridge
Stationary front
Low-pressure ridge
Warm front
Warm pressure front
Warm air boundary
Occluded ... | Cold front | general_qa | 74 |
The following is a multiple choice question (with answers).
===Question
The principal axis of an optical device is along $y=-1$, image of a small body placed at ($-30, 3$) is formed at a point ($60, -3$). Then the optical device is:-
===Choices
A concave lens of focal length $20\ cm$
A convex mirror of focal length $6... | A convex lens of focal length $20\ cm$ | general_qa | 191 |
The following is a multiple choice question (with answers).
===Question
A water mass \( A \), with a temperature \( T_A = 5^\circ C \) and salinity \( S_A = 35.5 \, \text{ppt} \), is mixed with a water mass \( B \), with a temperature \( T_B = 2^\circ C \) and salinity \( S_B = 34.5 \, \text{ppt} \). The resulting wate... | \( V_A : V_B = 1:2 \) | general_qa | 293 |
The following is a multiple choice question (with answers).
===Question
What is the name of the botanist who first formally described *Dendrobium pugioniforme* in 1839?
===Choices
Robert Brown
Allan Cunningham
Joseph Dalton Hooker
John Cunningham
John Smith
John Banks
John Dalton
John Lindley
Joseph Banks | Allan Cunningham | general_qa | 78 |
The following is a multiple choice question (with answers).
===Question
What does oxygen represent for aquatic animals?
===Choices
Limiting Factor
Variable Element
Comprehensive Factor
Surplus Resource
Stimulating Factor
Neutral Influence
Substitute Factor
Supporting Component
General Ecological Factors
Prominent Indi... | Limiting Factor | general_qa | 64 |
The following is a multiple choice question (with answers).
===Question
The diagonals of kite WXYZ intersect at P. If XP = 8, PZ = 8, WP = 6, and PY = 24, find ZY.
===Choices
34.1
15.4
18.9
32.5
22.8
26.9
25.3
30.2
28.7
20.1 | 25.3 | general_qa | 105 |
The following is a multiple choice question (with answers).
===Question
What is the dip angle of the fault plane of the high-angle reverse fault?
===Choices
Exactly 60 °
Exactly 50 °
Between 40 ° and 45 °
Under 10 °
Exactly 45 °
Between 30 ° and 40 °
Between 20 ° and 30 °
Under 30 °
Over 45 °
Exactly 20 ° | Over 45 ° | general_qa | 107 |
The following is a multiple choice question (with answers).
===Question
Compute the integral:
$$
\int \frac{ 3 }{ 4 \cdot x^2 \cdot \sqrt{5 \cdot x^2-2 \cdot x+1} } \, dx
$$
===Choices
3/4 * (C - sqrt(5 + 1/x^2 - 2/x) - ln(abs(1/x + sqrt(5 + 1/x^2 - 2/x) - 3)))
3/4 * (C - sqrt(5 + 1/x^2 - 2/x) - ln(abs(1/x + sqrt(5 + ... | 3/4 * (C - sqrt(5 + 1/x^2 - 2/x) - ln(abs(1/x + sqrt(5 + 1/x^2 - 2/x) - 1))) | general_qa | 525 |
The following is a multiple choice question (with answers).
===Question
Assuming the effective masses of electrons and holes are equal, the band gap of silicon is 1.12 eV. The mobilities of electrons and holes are $0.135 \, \mathrm{cm}^2/\mathrm{(V \cdot s)}$ and $0.048 \, \mathrm{cm}^2/\mathrm{(V \cdot s)}$, respectiv... | $$
- 9 4 8 ( \mathrm{\mu V} / \mathrm{K} )
$$ | general_qa | 368 |
The following is a multiple choice question (with answers).
===Question
The 13C chemical shifts of benzene and chloroform are 128.4 ppm and 77.2 ppm respectively. What is the difference in the 13C NMR frequencies of the two compounds on a 600 MHz spectrometer?
===Choices
122 kHz
183.2 kHz
60.3 kHz
91.6 kHz
500 kHz
7.7... | 7.73 kHz | general_qa | 133 |
The following is a multiple choice question (with answers).
===Question
NAD+, FAD, and CoA are all derivatives of chemical ___.
===Choices
Flavin Adenine Dinucleotide
Cytosine Monophosphate
Adenosine Monophosphate
Thiamine Pyrophosphate
Riboflavin Phosphate
Cytidine Diphosphate
Nicotinamide Adenine Dinucleotide
Guanos... | Adenosine Monophosphate | general_qa | 110 |
The following is a multiple choice question (with answers).
===Question
Under standard conditions (298.2 K, 1 atm), a chemical reaction can generate \(44000\) C of charge through an electrochemical cell. What is the maximum electric work (in J) that this reaction can produce?
===Choices
4000J
41000J
44000J
43000J
4440... | 44000J | general_qa | 137 |
The following is a multiple choice question (with answers).
===Question
What is the formula for calculating the total alkalinity (ALK) in seawater?
===Choices
[HCO₃⁻] + [CO₃²⁻] + [H₃BO₃]
[HCO₃⁻] + 3[CO₃²⁻] + [H₃BO₃]
[HCO₃⁻] + 2[CO₃²⁻] + [H₃BO₃]
[HCO₃⁻] + 2[CO₃²⁻] + 2[H₃BO₃]
[HCO₃⁻] + [CO₃²⁻] + [B(OH)₄⁻]
[HCO₃⁻] + [CO₃... | [HCO₃⁻] + 2[CO₃²⁻] + [H₃BO₃] | general_qa | 205 |
The following is a multiple choice question (with answers).
===Question
MSAFP levels should generally be done at what gestational age?
===Choices
14 weeks
16 weeks
20 weeks
17 weeks
9 weeks
18 weeks
11 weeks
13 weeks
12 weeks
15 weeks | 15 weeks | general_qa | 68 |
The following is a multiple choice question (with answers).
===Question
The reaction of sodium salts of phenolic compounds with carbon dioxide to introduce a carboxyl group on the () is called the Kaulpe reaction.
===Choices
nucleic base
ammonia molecule
carbonyl group
heterocyclic core
alkyl chain
aryl ring
alkene gr... | aryl ring | general_qa | 94 |
The following is a multiple choice question (with answers).
===Question
Among the following methods, the one that can be used to test whether the probability of a specific network structure appearing is greater than the random probability is:
===Choices
QAP regression with correlation test
core-periphery model
QAP per... | ERGM model | general_qa | 112 |
The following is a multiple choice question (with answers).
===Question
Who is the director of the movie 'Momotaro's Divine Sea Warriors'?
===Choices
Chen Xiaolong
Xu Zhengyang
Zhang Yiming
Sun Yifan
Zhao Zhongxing
Li Weiguo
Wang Jianmin
Zhou Yutong
Liu Haoran
Huang Zijian | Zhao Zhongxing | general_qa | 87 |
The following is a multiple choice question (with answers).
===Question
____ refers to the unintentional capture of species while targeting other species.
===Choices
Ocean byproduct
Accidental catch
Non-target haul
Bycatch
Target misfire
Fish misplacement
Unsought take
Marine residue
Overfishing
Indirect capture | Bycatch | general_qa | 70 |
The following is a multiple choice question (with answers).
===Question
The flight of the aircraft is affected by (), affecting its normal, quasi-spot navigation.
===Choices
Certain meteorological conditions
Multiple mechanical malfunctions
Frequent electrical failures
Various astronomical phenomena
Particular wildlif... | Certain meteorological conditions | general_qa | 79 |
The following is a multiple choice question (with answers).
===Question
Air is flowing through a nozzle with a 90% efficiency and an expansion rate of 2.0 Kg/s. The inlet conditions are P = 550kPa and T = 680°K. If the exit pressure is 120kPa calculate the actual exit area, velocity and enthalpy. Assume K = 1.4.
===Ch... | Exit area = 3.37 × 10^-3m^2, Velocity = 658 m/s, Enthalpy = 465.8 KJ/kg | general_qa | 486 |
The following is a multiple choice question (with answers).
===Question
Find the directional derivative of $f(x,y,z) = x^2 + y \cdot z$ at $P(1,-3,2)$ in the direction of increasing $t$ along the path
$\vec{r}(t) = t^2 \cdot \vec{i} + 3 \cdot t \cdot \vec{j} + \left(1-t^3\right) \cdot \vec{k}$.
===Choices
11/sqrt(198)... | 11/sqrt(22) | general_qa | 190 |
The following is a multiple choice question (with answers).
===Question
The separation degree represents the () of two adjacent chromatographic peaks. A separation degree ≥ () is the standard for complete separation of the two peaks.
===Choices
Peak separation, 1.5
Amount of overlap, 1.5
Degree of separation, 1.5
Widt... | Degree of separation, 1.5 | general_qa | 134 |
The following is a multiple choice question (with answers).
===Question
Glacial acetic acid has a melting point of 16°C at a pressure of 1 atm. a) Calculate the melting point at its vapor pressure of 0atm, given that the acid has a heat of fusion of 2700 cal/mole and a molecular weight of 60. Solid and liquid acetic ac... | 15.993C, 10900 cal/mole | general_qa | 296 |
The following is a multiple choice question (with answers).
===Question
The selectivity of an ion exchange resin to an ion is usually expressed by the ( ) of an ion.
===Choices
exchange rate
binding constant
conductance level
ionization potential
mobility ratio
transfer coefficient
absorption rate
selection coefficien... | selection coefficient | general_qa | 73 |
The following is a multiple choice question (with answers).
===Question
A three-phase asynchronous motor is given with $P_{\mathrm{N}}=2 \, \mathrm{kW}$, $n_{\mathrm{N}}=2,840 \, \mathrm{r/min}$, $\lambda_{\mathrm{m}}=2$, $U_{\mathrm{N}}=380 \, \mathrm{V}$, $f_{N}=50 \, \mathrm{Hz}$. Find the expression for its charact... | $${\frac{2 6. 8} {{\frac{0. 1 9 8} {S}}+{\frac{S} {0. 1 9 8}}}}
$$ | general_qa | 589 |
The following is a multiple choice question (with answers).
===Question
During the restoration process of wooden artifacts, it is often necessary to isolate fragments for microscopic examination to determine what plant material the artifact is made from. Which of the following type of cell is observed, it can be determ... | Molecular Conduit | general_qa | 114 |
The following is a multiple choice question (with answers).
===Question
During the observation of the hydra slide, you can first focus on the areas where relevant cells are concentrated to clearly observe the structure of these cells. In the hydra, where are gland cells and nematocysts concentrated?
===Choices
Base, p... | Foundation, tentacles | general_qa | 111 |
The following is a multiple choice question (with answers).
===Question
A rancher, being owner in fee simpleconveyed the property by warranty deed to a woman. The woman gave her niece a mortgage on the ranch to secure a loan from the niece to the woman in the amount of $500,000. The mortgage was recorded immediately. T... | not succeed, because the farmer did not promise to pay the mortgage debt. | general_qa | 342 |
The following is a multiple choice question (with answers).
===Question
What is the apparent magnitude of the star HD 183387?
===Choices
6.27
6.29
6.24
6.25
6.28
6.23
6.26
6.22
6.20
6.30 | 6.25 | general_qa | 83 |
The following is a multiple choice question (with answers).
===Question
This question refers to the following information.
"Those whose condition is such that their function is the use of their bodies and nothing better can be expected of them, those, I say, are slaves of nature. It is better for them to be ruled thus.... | Christopher Columbus was not the first European to have explored North America. | general_qa | 525 |
The following is a multiple choice question (with answers).
===Question
'Ambra' an innovative open source platform (for publishing open access resource articles)is developed by().
===Choices
SAGE Publications
IEEE
Cambridge University Press
Oxford University Press
Wiley
Nature Publishing
Elsevier
Taylor & Francis
PLOS... | PLOS | general_qa | 73 |
The following is a multiple choice question (with answers).
===Question
The equilibrium moisture content of the material must be ().
===Choices
bound moisture
total moisture level
absolute water quantity
critical moisture content
fixed hydration level
free moisture
unbound water
essential water proportion
variable wat... | bound moisture | general_qa | 65 |
The following is a multiple choice question (with answers).
===Question
Which of the following is true for the reaction
${H}_{2}O(l)\rightleftharpoons {H}_{2}O(g)$ at ${100}^{o}C$ and $1$ atmosphere
===Choices
$$\Delta H = \Delta S$$
$$\Delta H = T \Delta V$$
$$\Delta H = \Delta V$$
$$\Delta H=0$$
$$\Delta H=\Delta ... | $$\Delta H=0$$ | general_qa | 163 |
The following is a multiple choice question (with answers).
===Question
If a $g$ is the mass of $NaHC_{2}O_{4}$ required to neutralize $100\ mL$ of $0.2\ M\ NaOH$ and $b\ g$ that required to reduce $100\ mL$ of $0.02\ M\ KMnO_{4}$ in acidic medium, then
===Choices
$$2a = b$$
$$a = 6b$$
$$a = 4b$$
$$a = 7b$$
$$a = 3b$$... | $$a = 2b$$ | general_qa | 160 |
The following is a multiple choice question (with answers).
===Question
Which of the following ferns has leaves with ligules?
===Choices
Osmunda
Dryopteris
Pteridium
Athyrium
Adiantum
Cystopteris
Blechnum
Selaginella
Polypodium
Asplenium | Selaginella | general_qa | 74 |
The following is a multiple choice question (with answers).
===Question
We now define an algorithm: The definition of a(n) is the Zeckendorf-like expansion of n using the recurrence f(n) = f(n-1) + f(n-4), which is represented in binary where the binary expansion matches the pattern ((0)*0001)*(0*). Given the input x_l... | [546, 1024, 1025, 1026, 1028, 1032, 1040, 1041, 1056, 1057] | general_qa | 729 |
The following is a multiple choice question (with answers).
===Question
The diameter of the circular pipe $d = 2.5 \mathrm{cm}$, equivalent roughness $\Delta = 0.4 \mathrm{mm}$, average flow velocity in the pipe $v = 2.5 \mathrm{m/s}$, kinematic viscosity of water $\nu = 0.01 \mathrm{cm}^{2}/\mathrm{s}$. Find the wall ... | $$
35.47 (N/m^{2})
$$ | general_qa | 258 |
The following is a multiple choice question (with answers).
===Question
Given the following information, determine which elementary reaction has the highest frequency (occurrence) with the lowest success of molecular collisions.Rate law$k(s^{-1})$.$1$.$rate = k[A]^{1}[B]^{3}[C]^{0}$$3.16\times 10^{-4}$.$2$.$rate = k[A]... | Reaction $1$. | general_qa | 209 |
The following is a multiple choice question (with answers).
===Question
The condition for the separation of the longitudinal and lateral-directional equations of the small disturbance equation is
===Choices
the reference motion aligns with the aircraft's longitudinal axis, the vertical plane, and partially with the sy... | In the reference motion, the symmetry plane, the vertical plane, and the motion plane of the aircraft coincide | general_qa | 230 |
The following is a multiple choice question (with answers).
===Question
The experiment shows that when the bulk density of the fiber layer is in the range of ____ (g/cm³), its thermal conductivity is the lowest, meaning the fiber layer has the best thermal insulation properties.
===Choices
0.03-0.05
0.04-0.07
0.025-0.... | 0.03-0.06 | general_qa | 165 |
The following is a multiple choice question (with answers).
===Question
Perform the division of the binary numbers 111101 by 1001 and determine the remainder.
===Choices
100
1000
1011
1100
1001
1010
11
110
None of the other choices
101 | 11 | general_qa | 87 |
The following is a multiple choice question (with answers).
===Question
The Self-Strengthening Movement achieved some success but ultimately declared bankruptcy. The reasons for its failure include ( )
===Choices
The Self-Strengthening Movement had feudal and corrupt characteristics
The Self-Strengthening Movement was... | The Self-Strengthening Movement had feudal and corrupt characteristics | general_qa | 224 |
The following is a multiple choice question (with answers).
===Question
$0.5\ mol\ NaCl$ is dissolved in $500\ g\ H_{2}O$. Then determine freezing point and boiling point of solution :
Given ($K_{f})_{H_{2}O}=1.8\ K\ kg/mol$
($K_{b})_{H_{2}O}=0.5\ K\ kg/mol$
===Choices
$$-3.6^{o}C,\ 100^{o}C$$
$$-1.8^{o}C,\... | $$-1.8^{o}C,\ 100.5^{o}C$$ | general_qa | 298 |
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