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Quizzes

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4371 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. New
High School (11–12) · Dual Nature of Radiation and Matter
StemPy LabStemPy Lab
Medium
Isha looks up an isomerisation in a data book: its standard Gibbs energy change at 25 °C is -8.56 kJ/mol. Find the common logarithm of its equilibrium constant. New
High School (11–12) · Entropy, Gibbs Energy and Spontaneity
StemPy LabStemPy Lab
Medium
Codes of 3 different letters are made from the letters of PLANETS. Each code uses both vowels and one consonant. How many codes are there? New
High School (11–12) · Permutations and Combinations
StemPy LabStemPy Lab
Hard
A teacher shows her class the hearts of a magur, a bullfrog and a peacock. How many chambers do the three hearts have altogether? New
High School (11–12) · Chordates and Vertebrates
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
StemPy LabStemPy Lab
Medium
Which sentence is the best limit for a report on 20 winter days in one hill town? New
Middle Stage (6–8), High School (9–10), High School (11–12), Undergraduate, General · Averages: Mean, Median and Mode
StemPy LabStemPy Lab
Easy
According to Bohr, what is the angular momentum of the electron in the nth orbit? New
High School (11–12) · Atoms and Atomic Spectra
StemPy LabStemPy Lab
Easy
A reaction has Δ G° = +20 kJ/mol at 25 °C. What does the equilibrium mixture contain? New
High School (11–12) · Entropy, Gibbs Energy and Spontaneity
StemPy LabStemPy Lab
Medium
Zoya picks 2 of 8 novels and 3 of 5 books of poems to read this month. In how many ways can she pick? New
High School (11–12) · Permutations and Combinations
StemPy LabStemPy Lab
Medium
Which of these mammals lays eggs? New
High School (11–12) · Chordates and Vertebrates
StemPy LabStemPy Lab
Medium
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
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? New
Middle Stage (6–8), High School (9–10), High School (11–12), Undergraduate, General · Averages: Mean, Median and Mode
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? New
High School (11–12) · Atoms and Atomic Spectra
StemPy LabStemPy Lab
Medium
Kiran finds that, for one isomer turning into another in solution, Δ G° is exactly zero. Which value of the equilibrium constant goes with that? New
High School (11–12) · Entropy, Gibbs Energy and Spontaneity
StemPy LabStemPy Lab
Easy
From 5 boys and 3 girls, 3 children are chosen for a debate. How many choices include at least one girl? New
High School (11–12) · Permutations and Combinations
StemPy LabStemPy Lab
Medium
The long bones of a crow are hollow and full of air. What are such bones called? New
High School (11–12) · Chordates and Vertebrates
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
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? New
Middle Stage (6–8), High School (9–10), High School (11–12), Undergraduate, General · Averages: Mean, Median and Mode
StemPy LabStemPy Lab
Medium
A student says: Closing one end of an open pipe doubles its fundamental frequency. What is wrong? New
High School (11–12) · Superposition and Standing Waves
StemPy LabStemPy Lab
Medium
For a change in a closed flask, Anu finds Δ G = 0. What does this tell her? New
High School (11–12) · Entropy, Gibbs Energy and Spontaneity
StemPy LabStemPy Lab
Easy
A relay squad of 5 is picked from 9 swimmers, and the captain, Ojas, must be in it. How many squads are possible? New
High School (11–12) · Permutations and Combinations
StemPy LabStemPy Lab
Medium
Which reptile has a heart with two atria and two fully separate ventricles? New
High School (11–12) · Chordates and Vertebrates
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? New
Middle Stage (6–8), High School (9–10), High School (11–12), Undergraduate, General · Averages: Mean, Median and Mode
StemPy LabStemPy Lab
Hard
A string vibrates with 4 loops at 360 Hz. What is its fundamental frequency? New
High School (11–12) · Superposition and Standing Waves
StemPy LabStemPy Lab
Medium
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