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Quizzes

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Exam:
3815 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
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
Board Exam, AP, A-Level, IB
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
Board Exam, A-Level, IB
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
NEET, Board Exam
StemPy LabStemPy Lab
Medium
Inflated pods (I) are dominant over constricted ones (i). A function says "inflated" if g == "II" else "constricted". What ratio does it report for the boxes of Ii with Ii? New
High School (11–12), High School (9–10), Undergraduate, General · Biology by Computer, Simulation and Randomness
Board Exam, PCEP (Python Institute)
StemPy LabStemPy Lab
Medium
According to Bohr, what is the angular momentum of the electron in the nth orbit?
High School (11–12) · Atoms and Atomic Spectra
Board Exam, IB
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
Board Exam, AP, A-Level, IB
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
Board Exam, A-Level, IB
StemPy LabStemPy Lab
Medium
Which of these mammals lays eggs? New
High School (11–12) · Chordates and Vertebrates
Board Exam
StemPy LabStemPy Lab
Medium
Green pods (G) are dominant over yellow (g). What gametes does this line list? print(list("Gg")) New
High School (11–12), High School (9–10), Undergraduate, General · Biology by Computer, Simulation and Randomness
Board Exam, PCEP (Python Institute)
StemPy LabStemPy Lab
Easy
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
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
Board Exam, AP, A-Level, IB
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
Board Exam, A-Level, IB
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
Board Exam
StemPy LabStemPy Lab
Easy
One logistic step for a pond of algae. What does it print? r, K, N, dt = 0.25, 1500, 375, 2; N = N + r * N * (1 - N / K) * dt; print(N) New
High School (11–12), High School (9–10), Undergraduate, General · Biology by Computer, Simulation and Randomness
Board Exam, PCEP (Python Institute)
StemPy LabStemPy Lab
Medium
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
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
Board Exam, AP, A-Level, IB
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
Board Exam, A-Level, IB
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
Board Exam
StemPy LabStemPy Lab
Medium
Counting times for a growth experiment, in minutes. What does this print? import numpy as np; t = np.arange(0, 61, 15); print(len(t), t[-1]) New
High School (11–12), High School (9–10), Undergraduate, General · Biology by Computer, Simulation and Randomness
Board Exam
StemPy LabStemPy Lab
Easy
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
A salt dissolves with Δ H = +31 kJ/mol and Δ S = +97 J/(K mol). Above what temperature does it dissolve spontaneously? New
High School (11–12) · Entropy, Gibbs Energy and Spontaneity
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
Arun marks 12 dots on a page. Four of the dots sit in a straight row along a ruler's edge, and no other three dots are in a row. How many triangles can he draw with corners at the dots? New
High School (11–12) · Permutations and Combinations
Board Exam, A-Level, IB
StemPy LabStemPy Lab
Medium
In a toad, which single chamber receives the food canal, the urinary ducts and the reproductive ducts? New
High School (11–12) · Chordates and Vertebrates
Board Exam
StemPy LabStemPy Lab
Easy
A culture of 160 cells doubles every 35 min. What does this print? print(160 * 2 ** (105 / 35)) New
High School (11–12), High School (9–10), Undergraduate, General · Biology by Computer, Simulation and Randomness
Board Exam, PCEP (Python Institute)
StemPy LabStemPy Lab
Easy
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