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Exam:
279 quizzes
A hydrogen atom in its ground state takes in a photon of 13.22 eV. To which level does the electron go? New
High School (11–12) · Atoms and Atomic Spectra
NEET, Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
Rank the oxygen species O₂⁺, O₂ and O₂⁻ by bond length, from the shortest. New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds
NEET, Board Exam
StemPy LabStemPy Lab
Medium
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
A wire is drawn out to 3 times its length, and its volume stays the same. What happens to its resistance? New
High School (11–12) · Current Electricity
NEET, Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
Analysis shows that a colourless gas is 30.4% nitrogen and 69.6% oxygen, and a gas-density test puts its molar mass at 92 g mol⁻¹. Which formula fits both results? New
High School (11–12) · Stoichiometry and Concentration, The Mole Concept
NEET, Board Exam, AP, 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
A 60 W and a 40 W bulb, both made for 220 V, are joined in series to a 220 V supply. Which glows brighter? New
High School (9–10) · Current Electricity
NEET, Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Hard
A balloon holds 4 g of hydrogen and 16 g of oxygen. A spark sets off 2H₂ + O₂ → 2H₂O. Which gas runs out, and how much water is made? New
High School (9–10), General · Chemical Equations
NEET, Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Hard
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 satellite flies at a height of half the Earth's radius above the ground. What is g there? (g = 9.8 m/s² on the ground) New
High School (9–10), General · Gravitation
NEET, Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Hard
Which line of He⁺ has the same wavelength as the first Balmer line of hydrogen, n = 3 → 2?
High School (11–12) · Light, Atomic Spectra and the Bohr Model
JEE Main, NEET, BITSAT, WBJEE, Board Exam
StemPy LabStemPy Lab
Hard
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
A steel wire 20 m long hangs down a mine shaft under its own weight. By how much does it stretch? (Density of steel 7800 kg/m³, Y = 2.0 × 10¹¹ Pa, g = 9.8 m/s².) New
High School (11–12) · Elasticity and Mechanical Properties of Solids
JEE Main, NEET, BITSAT, WBJEE, Board Exam
StemPy LabStemPy Lab
Hard
A laser gives out 2.0 mW of light at 620 nm. About how many photons leave it each second? (1 eV = 1.6 × 10⁻¹⁹ J.)
High School (11–12) · Light, Atomic Spectra and the Bohr Model
NEET, Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Hard
Assertion (A): Thalassemia is a qualitative problem, in which an incorrectly functioning globin is made. Reason (R): In β thalassemia, production of the β-globin chain is affected; it is controlled by a single gene, HBB, on chromosome 11. New
High School (11–12) · Heredity and Inheritance
NEET
StemPy LabStemPy Lab
Hard
A copper wire and a steel wire of the same length carry the same load and stretch by the same amount. What is the ratio of the copper wire's diameter to the steel wire's? (Y: steel 2.0 × 10¹¹ Pa, copper 1.1 × 10¹¹ Pa.) New
High School (11–12) · Elasticity and Mechanical Properties of Solids
NEET, Board Exam, A-Level
StemPy LabStemPy Lab
Hard
10 g of hydrogen is mixed with 64 g of oxygen and sparked. Water forms with hydrogen and oxygen in the ratio 1 : 8. What mass of water forms?
High School (9–10), General · Laws of Chemical Combination
NEET, Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Hard
The figure shows a pedigree for a disorder controlled by one gene. Filled symbols are affected persons. Assume that no new mutation arises in the family. Which statement is correct? New
High School (11–12) · Heredity and Inheritance
NEET
StemPy LabStemPy Lab
Hard
A 125 kg space probe is hauled from the ground to a point one Earth radius (6400 km) above it, ending at rest. How many gigajoules (10⁹ J) of work does this take? Take g = 10 m/s² at the surface. New
High School (11–12) · Gravitation
NEET, Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
Read the following statements about sex-linked disorders. (i) Red-green colour blindness is due to a defect in either the red or the green cone of the eye. (ii) Colour blindness occurs in about 8 per cent of males but only about 0.4 per cent of females. (iii) The son of a woman who carries the gene for colour blindness has a 50 per cent chance of being colour blind. (iv) A daughter of a carrier mother is not colour blind unless her father is colour blind. (v) A haemophilic female is extremely rare, because her mother must be at least a carrier and her father haemophilic. (vi) Queen Victoria was haemophilic, and so several of her descendants were haemophilic. How many of the statements above are correct? New
High School (11–12) · Heredity and Inheritance
NEET
StemPy LabStemPy Lab
Hard
A body weighs 72 N on the Earth's surface. At what height above the surface, in kilometres, would it weigh 8 N? Take R = 6400 km. New
High School (11–12) · Gravitation
NEET, Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
Two statements about chromosomal disorders are given below. Statement I: Turner's syndrome, with the karyotype 45 with X0, is an example of aneuploidy. Statement II: Polyploidy, an increase in a whole set of chromosomes, results from a failure of cytokinesis after telophase, and it is often seen in plants. New
High School (11–12) · Heredity and Inheritance
NEET
StemPy LabStemPy Lab
Medium
Blocks of 4.0 kg and 2.0 kg hang from the two ends of a light string over a smooth pulley, and are let go. Taking g = 9.8 m/s², what is the tension in the string? New
High School (11–12) · Newton's Laws of Motion
NEET, Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
The karyotype of a child shows 47 chromosomes, with three copies of chromosome 21 and a normal pair of sex chromosomes. Which set of features fits this disorder? New
High School (11–12) · Heredity and Inheritance
NEET
StemPy LabStemPy Lab
Medium
Two blocks, 4.0 kg and 2.0 kg, sit side by side on a smooth table. A horizontal force of 18 N pushes the 4.0 kg block, and both move together. What force does the 4.0 kg block exert on the 2.0 kg block? New
High School (11–12) · Newton's Laws of Motion
NEET, Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
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