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4530 quizzes
A refrigerator in a room at 27 °C (300 K) turns 1.0 kg of water, which starts at room temperature, into ice at 0 °C (273 K). It works reversibly at every stage, giving out its heat to the room. The specific heat of water is 4200 J/(kg K) and the latent heat of fusion is 3.36 × 10⁵ J/kg. What is the least work it must be given? New
High School (11–12) · Heat Engines, the Second Law and Entropy
JEE Advanced, Olympiad
StemPy LabStemPy Lab
Advanced
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
Three genes, A, B and C, control a polygenic trait in a plant, and each dominant allele adds the same amount to the phenotype. A plant AaBbCc is crossed with a plant aabbcc. How many phenotypic classes appear among the offspring, and what is the largest fraction of the offspring found in any one class? New
High School (11–12) · Heredity and Inheritance
NEET
StemPy LabStemPy Lab
Hard
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
AP
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
An ideal monatomic gas (γ = 5/3) is taken round the cycle shown in the figure. From state A, at temperature T₀, it expands at constant pressure to twice its volume (state B). It then expands adiabatically until its temperature is T₀ again (state C). Finally it is compressed at constant temperature back to A. Let n be the number of moles. Which of the following statements are correct? New
High School (11–12) · Thermodynamic Processes and Specific Heats of Gases
JEE Advanced
StemPy LabStemPy Lab
Advanced
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
Two statements about chromosomal disorders are given below. Statement I: A person with Klinefelter's syndrome has the karyotype 47, XXY and is a fertile female. Statement II: Down's syndrome was first described by Langdon Down in 1866. New
High School (11–12) · Heredity and Inheritance
NEET
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
PCAP (Python Institute)
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
An engine runs an ideal gas round an Otto-type cycle: an adiabatic compression, heating at constant volume, an adiabatic expansion, and cooling at constant volume. The lowest temperature in the cycle (at the start of the compression) is 300 K, and the highest (at the end of the heating) is 1200 K. The compression ratio is chosen so that the engine does the most work per cycle. What is then the efficiency of the cycle? New
High School (11–12) · Heat Engines, the Second Law and Entropy
JEE Advanced
StemPy LabStemPy Lab
Advanced
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
Match the terms in List-I with their meanings in List-II. List-I (Term) A. Law of dominance B. Law of segregation C. Law of independent assortment D. Test cross List-II (Meaning) I. In a dihybrid, the segregation of one pair of characters is independent of the other pair II. In a dissimilar pair of factors, one member of the pair dominates the other III. An organism with the dominant phenotype is crossed with the recessive parent to find its genotype IV. The two alleles of a pair separate, so a gamete receives only one of them New
High School (11–12) · Heredity and Inheritance
NEET
StemPy LabStemPy Lab
Medium
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
PCAP (Python Institute)
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
AP, IB
StemPy LabStemPy Lab
Medium
One mole of an ideal monatomic gas is at 300 K and 1.0 × 10⁵ Pa in a thermally insulated cylinder. The pressure outside the piston is suddenly raised to 2.0 × 10⁵ Pa and then kept steady, so the gas is squeezed quickly until it is again at rest, at 2.0 × 10⁵ Pa. Ignore friction and the mass of the piston, and take R = 8.314 J/(mol K). Which of the following statements are correct? New
High School (11–12) · Laws of Thermodynamics
JEE Advanced
StemPy LabStemPy Lab
Advanced
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
Phenylketonuria is an inborn error of metabolism, inherited as an autosomal recessive trait, and it is often given as an example of pleiotropy. Which statement explains why it is an example of pleiotropy? New
High School (11–12) · Heredity and Inheritance
NEET
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
AP, IB
StemPy LabStemPy Lab
Hard
An ideal monatomic gas expands slowly along a path on which PV^(1.2) stays constant. Which statement is correct for this expansion? New
High School (11–12) · Thermodynamic Processes and Specific Heats of Gases
JEE Advanced
StemPy LabStemPy Lab
Advanced
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