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5280 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
StemPy LabStemPy Lab
Hard
A strip of lead is dipped into copper sulphate solution. Use E°(Pb²⁺/Pb) = -0.13 V and E°(Cu²⁺/Cu) = +0.34 V. What happens? New
High School (11–12) · Redox Reactions
StemPy LabStemPy Lab
Medium
The expansion of (x³ + 2/x²)⁵ has a constant term. What is its value? New
High School (11–12) · Algebra
StemPy LabStemPy Lab
Medium
What decides the amount and the taste of the honey from an apiary? New
High School (9–10) · Biology in Human Welfare
StemPy LabStemPy Lab
Medium
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
StemPy LabStemPy Lab
Medium
Potassium has E° = -2.93 V, silver +0.80 V and chlorine, as Cl₂/Cl⁻, +1.36 V. Which of these is the strongest reducing agent? New
High School (11–12) · Redox Reactions
StemPy LabStemPy Lab
Easy
Which are the middle terms of the expansion of (a + b)¹⁵? New
High School (11–12) · Algebra
StemPy LabStemPy Lab
Medium
Kavita's farm has 700 laying birds. Each morning, 65 in every 100 of them have laid. If this stays the same, how many eggs does she collect over 5 mornings? New
High School (9–10) · Biology in Human Welfare
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
StemPy LabStemPy Lab
Medium
Meera finds the cell potential of an aluminium and copper cell as E°(anode) - E°(cathode) and gets -2.00 V. She says the cell cannot work. What is her mistake? New
High School (11–12) · Redox Reactions
StemPy LabStemPy Lab
Medium
The expansion of (a + b)ⁿ has 25 terms. Which term is the middle term? New
High School (11–12) · Algebra
StemPy LabStemPy Lab
Medium
Which honeybee has been brought to India to raise honey yield, because it collects much honey, stings little and breeds well? New
High School (9–10) · Biology in Human Welfare
StemPy LabStemPy Lab
Medium
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
StemPy LabStemPy Lab
Medium
A hydrogen and oxygen fuel cell runs the reaction 2H₂ + O₂ → 2H₂O, which transfers 4 mol of electrons, with E° = 1.23 V. What is Δ G° for the reaction as written? New
High School (11–12) · Redox Reactions
StemPy LabStemPy Lab
Medium
Which term of the expansion of (x² + 1/x)¹² contains x⁶? New
High School (11–12) · Algebra
StemPy LabStemPy Lab
Medium
In composite fish culture, which fish feeds at the bottom of the pond? New
High School (9–10) · Biology in Human Welfare
StemPy LabStemPy Lab
Medium
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
StemPy LabStemPy Lab
Medium
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