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5421 quizzes
A student cannot read the internal resistance of a cell directly. She finds its null point on a potentiometer wire at 518 cm, and then at 370 cm after placing a 5.0 Ω load across it. What is the internal resistance? New
High School (11–12) · Current Electricity
A-Level, AP, IB
StemPy LabStemPy Lab
Hard
An analyst oxidises 0.56 g of a sulphur-bearing solid with fuming nitric acid. Barium chloride then gives 0.93 g of barium sulphate, of molar mass 233 g/mol. What is the sulphur content of the solid, in per cent by mass? New
High School (11–12) · Purification and Analysis of Organic Compounds
A-Level, IB
StemPy LabStemPy Lab
Hard
The tangents at the two ends A and B of a diameter of a circle with centre O are parallel. A third tangent touches the circle at C and cuts them at D and E. What is the angle ∠ DOE? New
High School (9–10), General · Circles
SAT
StemPy LabStemPy Lab
Hard
Which description of bark is the most complete? New
High School (11–12) · Anatomy of Flowering Plants
A-Level, IB
StemPy LabStemPy Lab
Hard
Why does `curve_fit` need a first guess `p0` when it fits a sine? New
High School (11–12), High School (9–10), Undergraduate, General · Trigonometry and Waves by Computer
StemPy LabStemPy Lab
Medium
Which sentence is the best limit for a report on 20 winter days in one hill town?
Middle Stage (6–8), High School (9–10), High School (11–12), Undergraduate, General · Averages: Mean, Median and Mode
StemPy LabStemPy Lab
Easy
A potentiometer measures the emf of a cell more accurately than a voltmeter does, because at balance the potentiometer New
High School (11–12) · Current Electricity
A-Level, AP, IB
StemPy LabStemPy Lab
Medium
A colourless liquid holds only carbon and hydrogen, 92.3 % and 7.7 % by mass. Its vapour is 39 times as dense as hydrogen gas. Which is its molecular formula? New
High School (11–12) · Purification and Analysis of Organic Compounds
A-Level, IB
StemPy LabStemPy Lab
Medium
Two circles have radii 10 cm and 4 cm, and their centres are 10 cm apart. A straight line touches both circles and does not cross the line joining the centres. How long is the segment of this line between the two points of contact? New
High School (9–10), General · Circles
SAT
StemPy LabStemPy Lab
Hard
Under a lens, a student sees a ring with wide pale cells on its inner side and narrow dark cells on its outer side. Which part was made first in the year? New
High School (11–12) · Anatomy of Flowering Plants
A-Level, IB
StemPy LabStemPy Lab
Medium
A sensor takes 40 readings, one every 0.025 s. What does this code print for the gap between FFT frequencies, in Hz? `import numpy as np; print(np.fft.rfftfreq(40, d=0.025)[1])` New
High School (11–12), High School (9–10), Undergraduate, General · Trigonometry and Waves by Computer
StemPy LabStemPy Lab
Medium
A student writes: \"The mean highest temperature in the hill town was 12 °C, so every day was about 12 °C.\" What is wrong?
Middle Stage (6–8), High School (9–10), High School (11–12), Undergraduate, General · Averages: Mean, Median and Mode
StemPy LabStemPy Lab
Medium
Two cells balance on a potentiometer wire at 140 cm and 210 cm. What is the ratio of their emfs, first to second? New
High School (11–12) · Current Electricity
A-Level, AP, IB
StemPy LabStemPy Lab
Medium
Which compound cannot have all of its nitrogen found by the Kjeldahl method? New
High School (11–12) · Purification and Analysis of Organic Compounds
A-Level, IB
StemPy LabStemPy Lab
Medium
A parallelogram has all four of its sides touching one circle. What kind of parallelogram must it be? New
High School (9–10), General · Circles
SAT
StemPy LabStemPy Lab
Medium
A lightning strike burns out the whole centre of an old tree, but the tree keeps its leaves. Which statement explains this? New
High School (11–12) · Anatomy of Flowering Plants
A-Level, IB
StemPy LabStemPy Lab
Hard
An engineer wants to record a 70 Hz vibration without aliasing. How many readings each second must she take? New
High School (11–12), High School (9–10), Undergraduate, General · Trigonometry and Waves by Computer
StemPy LabStemPy Lab
Easy
In the hill town, the 3 snowy days had a mean highest temperature of 8.7 °C, and the other 17 days 12.5 °C. What may a report say?
Middle Stage (6–8), High School (9–10), High School (11–12), Undergraduate, General · Averages: Mean, Median and Mode
AP, IB
StemPy LabStemPy Lab
Medium
A student finds the resistance of a coil with a meter bridge. The coil is in the left gap and an 18 Ω box is in the right gap. The galvanometer reads zero when the jockey touches the wire at the 45 cm mark. What is the resistance of the coil? New
High School (11–12) · Current Electricity
A-Level, AP, IB
StemPy LabStemPy Lab
Medium
A food analyst digests 0.64 g of breakfast cereal by Kjeldahl's method. The ammonia given off uses up 32 mL of 0.14 mol/L hydrochloric acid. Find the nitrogen content of the cereal, in per cent by mass. New
High School (11–12) · Purification and Analysis of Organic Compounds
A-Level, IB
StemPy LabStemPy Lab
Medium
A round wire ring fits snugly inside a triangular frame with a right angle, touching all three bars. The two short bars are 12 cm and 35 cm and the long bar is 37 cm. What is the radius of the ring? New
High School (9–10), General · Circles
SAT
StemPy LabStemPy Lab
Medium
A forester looks at the bark of a young tree and sees many tiny, raised patches. Through them air can reach the living cells beneath. What are these patches? New
High School (11–12) · Anatomy of Flowering Plants
A-Level, IB
StemPy LabStemPy Lab
Easy
A string of length 0.45 m, fixed at both ends, carries waves of speed 63 m/s. What does this code print for its first three harmonics in Hz? `L, v = 0.45, 63.0; print([n * v / (2 * L) for n in (1, 2, 3)])` New
High School (11–12), High School (9–10), Undergraduate, General · Trigonometry and Waves by Computer
StemPy LabStemPy Lab
Medium
The chance of a snowy day is 0.15. If each day's weather did not depend on the day before, what would be the chance of two snowy days in a row?
Middle Stage (6–8), High School (9–10), High School (11–12), Undergraduate, General · Averages: Mean, Median and Mode
AP, IB
StemPy LabStemPy Lab
Hard
The measurement in a meter bridge is most accurate when the balance point is near New
High School (11–12) · Current Electricity
A-Level, AP, IB
StemPy LabStemPy Lab
Medium
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