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Quizzes

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Exam:
1792 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
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
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
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
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 assertEqual(0.1 + 0.2, 0.3) fail, while assertAlmostEqual(0.1 + 0.2, 0.3) passes?
High School (11–12), High School (9–10), Undergraduate, General · Testing and Debugging
A-Level, 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
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
add(a, b) has a bug: it returns a - b. Which test would let the bug slip through?
High School (11–12), High School (9–10), Undergraduate, General · Testing and Debugging
A-Level, IB
StemPy LabStemPy Lab
Medium
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
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
A linked list has 6 nodes. How many next links does a walk from the head follow to reach node 6?
High School (11–12), High School (9–10), Undergraduate, General · Data Structures
A-Level, IB
StemPy LabStemPy Lab
Medium
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
A salt of the type AB dissolves to 8.0 × 10⁻⁵ mol/L in water at 25 °C. What is its Ksp? New
High School (11–12) · Buffers, Salt Hydrolysis and Solubility Product
A-Level, AP, IB
StemPy LabStemPy Lab
Easy
For which value of x are x, x + 3 and x + 9 three terms of a geometric progression, in that order? New
High School (11–12) · Sequences and Series
A-Level, IB
StemPy LabStemPy Lab
Medium
Which structure has nine triplets of microtubules round the edge and no central pair? New
High School (11–12) · Cell Structure and Organelles
A-Level, AP, IB
StemPy LabStemPy Lab
Medium
5, 2 and 8 are inserted into an empty binary search tree. Where is 8?
High School (11–12), High School (9–10), Undergraduate, General · Data Structures
A-Level, IB
StemPy LabStemPy Lab
Easy
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