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Quizzes

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4211 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
Tin(IV) chloride is a liquid that boils at 114 °C, while tin(II) chloride is a solid that melts at 247 °C. What explains this? New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds, Lewis Structures and Ionic Bonds
StemPy LabStemPy Lab
Medium
A shop sells 5 kites on its first day and the same number more on each day after. In 10 days it sells 185 kites. By how many kites does the daily sale rise? New
High School (9–10), General · Sequences and Series
StemPy LabStemPy Lab
Medium
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
In the best Lewis structure of the chlorate ion, ClO₃⁻, chlorine has two double bonds and one single bond, all made equal by resonance. What is the bond order of each Cl to O bond? New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds, Lewis Structures and Ionic Bonds
StemPy LabStemPy Lab
Medium
What is the sum of all the two-digit numbers that are multiples of 4? New
High School (9–10), General · Sequences and Series
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
Rank Cl₂O, H₂O and OF₂ by bond angle, from the largest. New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds, Lewis Structures and Ionic Bonds
StemPy LabStemPy Lab
Hard
Neha saves ₹100 in the first month and ₹25 more each month after that. How much has she saved after 12 months? New
High School (9–10), General · Sequences and Series
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
How many hydrogen atoms in a molecule of diborane are bonded to both boron atoms? New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds, Lewis Structures and Ionic Bonds
StemPy LabStemPy Lab
Medium
Ishaan says that the sum of the first 10 terms of an arithmetic progression is always 10 times its 5th term. What is the truth? New
High School (9–10), General · Sequences and Series
StemPy LabStemPy Lab
Hard
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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