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5030 quizzes
A steel wire is fixed between two rigid supports 0.80 m apart. It is stretched so that its strain is 1.6 × 10⁻³. Steel has a Young's modulus of 2.0 × 10¹¹ Pa and a density of 8000 kg/m³. What is the fundamental frequency of the wire? Give the answer in Hz. New
High School (11–12) · Superposition and Standing Waves
JEE Advanced, JEE Main
StemPy LabStemPy Lab
Hard
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
Tara pays ₹600000 for a delivery van. Its resale price drops by 15% of the current price every twelve months. What is the van worth two years after purchase? New
High School (11–12) · Sequences and Series
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
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 organ pipe has two neighbouring resonant frequencies of 500 Hz and 700 Hz, and no resonance between them. The speed of sound is 340 m/s. Neglect the end correction. How long is the pipe? Give the answer in cm. New
High School (11–12) · Sound Waves and Hearing
JEE Advanced, JEE Main
StemPy LabStemPy Lab
Hard
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
For two positive numbers a and b with arithmetic mean A and geometric mean G, which statement is always true? New
High School (11–12) · Sequences and Series
A-Level, IB
StemPy LabStemPy Lab
Easy
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
Why does a simulation of crosses call `random.seed(5)` at the top? New
High School (11–12), High School (9–10), Undergraduate, General · Biology by Computer, Simulation and Randomness
PCAP (Python Institute)
StemPy LabStemPy Lab
Easy
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
A source of sound of frequency 400 Hz moves at 20 m/s straight towards a large wall. A listener stands at rest behind the source, on the same line, so the source moves away from the listener. The speed of sound is 340 m/s. Which of the following statements are correct? New
High School (11–12) · Doppler Effect
JEE Advanced
StemPy LabStemPy Lab
Advanced
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
Two positive numbers have arithmetic mean 25 and geometric mean 20. What are they? New
High School (11–12) · Sequences and Series
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 plant is AAIi. What different gametes does this print? `from itertools import product; print(sorted(set("".join(p) for p in product("AA", "Ii"))))` New
High School (11–12), High School (9–10), Undergraduate, General · Biology by Computer, Simulation and Randomness
PCAP (Python Institute)
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 standing wave on a string is y = (6.0 mm) sin(10π x) cos(200π t), with x in metres and t in seconds. Which of the following statements are correct? New
High School (11–12) · Superposition and Standing Waves
JEE Advanced
StemPy LabStemPy Lab
Advanced
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
Which fraction equals the recurring decimal 0.63 = 0.636363…? New
High School (11–12) · Sequences and Series
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
How many gametes does this list for AaIi? `from itertools import product; print(len(list(product("Aa", "Ii"))))` New
High School (11–12), High School (9–10), Undergraduate, General · Biology by Computer, Simulation and Randomness
StemPy LabStemPy Lab
Easy
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 string 1.2 m long, with a linear mass density of 5.0 g/m, is fixed at both ends under a tension of 72 N. It vibrates in its third harmonic, and the amplitude at each antinode is 5.0 mm. What is the total energy of the vibration? New
High School (11–12) · Superposition and Standing Waves
JEE Advanced, Olympiad
StemPy LabStemPy Lab
Advanced
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