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Quizzes

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4221 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
A full bottle of water left in a freezer cracks. What do hydrogen bonds do as the water turns to ice? New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds
StemPy LabStemPy Lab
Medium
Which pair is the square roots of 3 + 4i? New
High School (11–12) · Complex Numbers, Quadratic Equations
StemPy LabStemPy Lab
Hard
A school has 1150 girls and 1250 boys. What is its sex ratio, as girls for every 1000 boys? New
High School (9–10), General · Human Reproduction
StemPy LabStemPy Lab
Medium
Across the first 36 elements, what is the sign of the correlation between atomic radius and first ionisation enthalpy? New
High School (11–12), High School (9–10), Undergraduate, General · Chemistry by Computer, Data Analysis with pandas
StemPy LabStemPy Lab
Easy
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
Only the 2s and 2p orbitals of two neighbouring atoms are combined. How many molecular orbitals result? New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds
StemPy LabStemPy Lab
Easy
Which numbers solve x² - 2x + 5 = 0? New
High School (11–12) · Complex Numbers, Quadratic Equations
StemPy LabStemPy Lab
Medium
Which method of preventing pregnancy works by stopping the release of eggs? New
High School (9–10), General · Human Reproduction
StemPy LabStemPy Lab
Medium
Rubidium, strontium, indium and tin, in order of Z. What does this print? `import pandas as pd; s = pd.Series([403, 549, 558, 709]); print(list(s.diff().dropna().astype(int)))` New
High School (11–12), High School (9–10), Undergraduate, General · Chemistry by Computer, Data Analysis with pandas
StemPy LabStemPy Lab
Medium
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
Which energy order fits the 2p molecular orbitals of N₂? New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds
StemPy LabStemPy Lab
Medium
Asha's quadratic has real coefficients, and -1 + 4i satisfies it. Which number must satisfy it as well? New
High School (11–12) · Complex Numbers, Quadratic Equations
StemPy LabStemPy Lab
Medium
HIV-AIDS is passed on through sexual contact. What causes it? New
High School (9–10), General · Human Reproduction
StemPy LabStemPy Lab
Easy
Strontium, barium and iodine are grouped by block. What does this print? `import pandas as pd; df = pd.DataFrame({"block": ["s", "s", "p"], "ie": [549, 503, 1008]}); print(df.groupby("block")["ie"].mean()["s"])` New
High School (11–12), High School (9–10), Undergraduate, General · Chemistry by Computer, Data Analysis with pandas
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
Steam distillation separates ortho-nitrophenol from para-nitrophenol. Which one comes over with the steam, and why? New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds
StemPy LabStemPy Lab
Medium
How far apart are 2 + 3i and -6 - 3i on the Argand plane? New
High School (11–12) · Complex Numbers, Quadratic Equations
StemPy LabStemPy Lab
Medium
Why does menstruation happen in a month when there is no pregnancy? New
High School (9–10), General · Human Reproduction
StemPy LabStemPy Lab
Medium
Which graph shows the first ionisation enthalpy of the first ten elements against Z? New
High School (11–12), High School (9–10), Undergraduate, General · Chemistry by Computer, Data Analysis with pandas
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? 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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