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7044 quizzes
A coil of 2 H has no resistance. It is joined across a capacitor of 8 µF that has been charged to 40 V. What is the largest current that flows? New
High School (11–12) · Alternating Current
A-Level, IB
StemPy LabStemPy Lab
Hard
An octahedral d⁴ ion is first bound to a weak ligand and shows 4 unpaired electrons. A stronger ligand then replaces it, and the complex shows 2 unpaired electrons. Which statement explains this? New
High School (11–12) · Bonding: Valence Bond and Crystal Field Theory
A-Level, IB
StemPy LabStemPy Lab
Hard
A hemispherical bowl of radius 10 cm stands with its flat rim on top, as in the picture. It holds water 4 cm deep at the middle. What volume of water does it hold? New
High School (11–12) · Application of Integrals
A-Level, AP, IB
StemPy LabStemPy Lab
Hard
A drug stops the spindle from forming in dividing cells. In which stage do the cells collect, and which checkpoint holds them? New
High School (11–12) · Cell Cycle and Cell Division
A-Level, AP, IB
StemPy LabStemPy Lab
Hard
A student types six expressions, one at a time, into a fresh Python session. Which of them give a value, instead of an error message? Choose every correct option. New
High School (9–10) · Errors and Exceptions
PCEP (Python Institute)
StemPy LabStemPy Lab
Hard
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
An inductor of 0.9 H and a capacitor of 10 µF are joined in a loop with no resistance. At what angular frequency does the charge oscillate? New
High School (11–12) · Alternating Current
A-Level, IB
StemPy LabStemPy Lab
Medium
Seven d electrons sit in a strong octahedral field, so the complex is low spin, with Δo = 190 kJ/mol. Find the stabilisation energy from the splitting alone. New
High School (11–12) · Bonding: Valence Bond and Crystal Field Theory
A-Level, IB
StemPy LabStemPy Lab
Medium
A cyclist rides for 6 hours. Her speed v(t) in km per hour is a continuous function of the time t in hours, and she covers 30 km in all. Which statement must be true? New
High School (11–12) · Application of Integrals
A-Level, AP, IB
StemPy LabStemPy Lab
Medium
After anaphase, the activity of the M cyclin and CDK complex falls sharply. What is the reason? New
High School (11–12) · Cell Cycle and Cell Division
A-Level, AP, IB
StemPy LabStemPy Lab
Hard
A loop prints a value in a try block. One item is the text "2", and only one kind of error is handled. What happens when the program runs? New
High School (9–10) · Errors and Exceptions
PCEP (Python Institute)
StemPy LabStemPy Lab
Advanced
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
An LC circuit has no resistance. Which statement describes the circuit at the instant when the capacitor holds no charge? New
High School (11–12) · Alternating Current
A-Level, IB
StemPy LabStemPy Lab
Medium
A student says that the high spin ion [Mn(H₂O)₆]²⁺ has a CFSE of -2.0 Δo, because all five d electrons go into the t_2g set. What is the mistake? New
High School (11–12) · Bonding: Valence Bond and Crystal Field Theory
A-Level, IB
StemPy LabStemPy Lab
Medium
A winding footpath follows the curve y = 2/3x^(3/2) from x = 0 to x = 8, with x and y in metres. The council wants to know the length of the path. How long is it? New
High School (11–12) · Application of Integrals
A-Level, AP, IB
StemPy LabStemPy Lab
Hard
When the Rb protein is not phosphorylated, it binds E2F. What is the effect? New
High School (11–12) · Cell Cycle and Cell Division
A-Level, AP, IB
StemPy LabStemPy Lab
Hard
A try statement has three except blocks, and the error fits more than one of them. What does the program print? New
High School (9–10) · Errors and Exceptions
PCEP (Python Institute)
StemPy LabStemPy Lab
Hard
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 cable of total resistance 6 Ω is fed with 36 kW at 4 kV. The power factor is 1. How much of the power is lost as heat in the cable? New
High School (11–12) · Alternating Current
A-Level, IB
StemPy LabStemPy Lab
Medium
Which of these complexes is expected to be colourless in solution? New
High School (11–12) · Bonding: Valence Bond and Crystal Field Theory
A-Level, IB
StemPy LabStemPy Lab
Medium
A farm tank in a dry region is filled by a pump. The rate of inflow is r(t) = 24 - 3t litres per minute, for 0 ≤ t ≤ 8 minutes, where t is the time since the pump started. How many litres enter the tank in the eight minutes? New
High School (11–12) · Application of Integrals
A-Level, AP, IB
StemPy LabStemPy Lab
Medium
One cell of a tissue culture divides every 8 h, and each new cell does the same. None dies. How many cells are there after 2 days? New
High School (11–12) · Cell Cycle and Cell Division
A-Level, AP, IB
StemPy LabStemPy Lab
Medium
A loop adds a note to a list before a statement that can fail. Two except blocks add other notes. What does the program print? New
High School (9–10) · Errors and Exceptions
PCEP (Python Institute)
StemPy LabStemPy Lab
Hard
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
Why is electric power sent over long distances at a very high voltage? New
High School (11–12) · Alternating Current
A-Level, IB
StemPy LabStemPy Lab
Medium
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