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Quizzes

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Exam:
1654 quizzes
A cricket ball of 0.15 kg moves at 20 m/s. What is its de Broglie wavelength? Take h = 6.63 × 10⁻³⁴ J s.
High School (11–12) · Dual Nature of Radiation and Matter
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
Which pair is the main buffer that keeps the pH of human blood steady? New
High School (11–12) · Buffers, Salt Hydrolysis and Solubility Product
A-Level, AP, IB
StemPy LabStemPy Lab
Easy
How can cot A be written using only sin A, for an acute angle A? New
High School (9–10), General · Trigonometric Identities
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
A centrosome has two centrioles. How many microtubules are there in the peripheral fibrils of the two together? New
High School (11–12) · Cell Structure and Organelles
A-Level, AP, IB
StemPy LabStemPy Lab
Medium
Kavi simulates Gg with Gg for 12 plants and gets 5 with yellow pods. What should Kavi do before calling the 3 to 1 rule wrong? New
High School (11–12), High School (9–10), Undergraduate, General · Biology by Computer, Simulation and Randomness
AP
StemPy LabStemPy Lab
Medium
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 hydrogen lamp glows violet at one Balmer line, made by jumps from n = 5 down to n = 2. Taking hc = 1240 eV nm, what is its wavelength?
High School (11–12) · Atoms and Atomic Spectra
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
Calcium carbonate has Ksp = 3.3 × 10⁻⁹. Hard water has [Ca²⁺] = 2.0 × 10⁻⁴ mol/L and [CO₃²⁻] = 3.0 × 10⁻⁵ mol/L. What happens? New
High School (11–12) · Buffers, Salt Hydrolysis and Solubility Product
A-Level, AP, IB
StemPy LabStemPy Lab
Medium
Which equation holds for every angle A with 0° < A < 90°? New
High School (9–10), General · Trigonometric Identities
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
A small knob at the end of some chromosomes lies beyond a constriction that does not stain. What is the knob called? New
High School (11–12) · Cell Structure and Organelles
A-Level, AP, IB
StemPy LabStemPy Lab
Hard
A bug hides somewhere in 64 lines. About how many checks does bisection need to find its line?
High School (11–12), High School (9–10), Undergraduate, General · Testing and Debugging
AP, A-Level, IB
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
A student says: Closing one end of an open pipe doubles its fundamental frequency. What is wrong?
High School (11–12) · Superposition and Standing Waves
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
Arjun adds a few crystals of common salt to a clear, saturated solution of silver chloride. What does he see? New
High School (11–12) · Buffers, Salt Hydrolysis and Solubility Product
A-Level, AP, IB
StemPy LabStemPy Lab
Easy
An acute angle A has sec A = 5/4. Find tan A. New
High School (9–10), General · Trigonometric Identities
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
In which part of the nucleus is ribosomal RNA made in large amounts? New
High School (11–12) · Cell Structure and Organelles
A-Level, AP, IB
StemPy LabStemPy Lab
Easy
A list grows from 1000 to 2000 sorted items. How many more checks, at most, does binary search need?
High School (9–10), High School (11–12), Undergraduate, General · Searching and Sorting
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
A drawer has 3 black and 5 white socks. Two socks are taken without looking, and the first is not put back. What is the probability that both are black?
Middle Stage (6–8), High School (9–10), High School (11–12), Undergraduate, General · Probability and Chance
AP, IB
StemPy LabStemPy Lab
Hard
A string vibrates with 4 loops at 360 Hz. What is its fundamental frequency?
High School (11–12) · Superposition and Standing Waves
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
Magnesium hydroxide, of the type AB₂, dissolves to 2.0 × 10⁻⁴ mol/L in a sample of water. What is its Ksp? New
High School (11–12) · Buffers, Salt Hydrolysis and Solubility Product
A-Level, AP, IB
StemPy LabStemPy Lab
Medium
Simplify (1 - sin² A) sec² A for an acute angle A. New
High School (9–10), General · Trigonometric Identities
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
The two arms of a chromosome are of very different lengths, one of them tiny. What kind of chromosome is it? New
High School (11–12) · Cell Structure and Organelles
A-Level, AP, IB
StemPy LabStemPy Lab
Medium
Ice cream sales and the number of swimmers at a beach have a correlation of 0.9. What does this show?
High School (11–12), High School (9–10), Undergraduate, General · Graphs with matplotlib
AP
StemPy LabStemPy Lab
Medium
Kiran flips a coin four times for a game. If the coin is fair, how likely is she to see tails at least once?
Middle Stage (6–8), High School (9–10), High School (11–12), Undergraduate, General · Probability and Chance
AP, IB
StemPy LabStemPy Lab
Hard
An organ pipe, open at both ends, is 0.4 m long. If sound goes at 340 m/s, what is its lowest note?
High School (11–12) · Superposition and Standing Waves
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Easy
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