ICSE Class 10 Modern Physics — Mock Test (2027)
Free online mock test for Modern Physics (ICSE Class 10 Physics) — 20 competency-based questions based on the latest CISCE 2027 syllabus, with instant marking. Try the samples below, then take the full test free.
What to expect: This mock test covers key concepts from the Modern Physics chapter — including application-based and competency-focused questions aligned with how ICSE actually sets the paper.
Tip: Attempt without notes first to identify gaps, then review explanations for any wrong answers. Retake after a few days for best retention.
Sample questions
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1.Why do heavy nuclei contain a greater number of neutrons than protons?
- A.Neutrons reduce electrostatic repulsion between protons, stabilizing the nucleus
- B.Neutrons increase the binding energy of protons, making the nucleus lighter
- C.Protons repel neutrons, so more neutrons are needed to balance forces
- D.Neutrons convert into protons to maintain nuclear charge equilibrium
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2.4. The radiation suffering the maximum deflection in a magnetic field is
- A.α-particles
- B.β-particles
- C.X-rays
- D.γ radiations
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3.A thorium isotope ${}^{223}\mathrm{Th}$ undergoes an α-decay and changes into radium. What are the atomic number and mass number of the radium produced?
- A.Atomic number 88, mass number 219
- B.Atomic number 90, mass number 223
- C.Atomic number 86, mass number 215
- D.Atomic number 92, mass number 227
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4.During the emission of a beta particle from a radioactive nucleus, which of the following remains the same?
- A.Atomic number
- B.Mass number
- C.Number of neutrons
- D.Number of protons
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5.Wood contains a lot of carbon, most of which is the isotope carbon-12 or $\frac{12}{6}C$. Wood also contains a small fraction of the radioactive isotope carbon-14 or $\frac{14}{6}C$. The half-life of carbon-14 is 5700 years. Carbon-14 decays to nitrogen-14. While a tree is alive, it has a constant fraction of carbon-14. But, after the tree dies, this fraction decreases because of radioactive decay. Measurement of this fraction allows us to work out the age of very old samples of wood. (i) Calculate the number of neutrons in a nucleus of carbon-12. (ii) A scientist compares two samples of wood: one from a recently felled tree, the other from an older piece of wood. After corrections to account for the background count and mass of the samples, the scientist finds the count rate from the old wood is four times lower than the count rate from the new wood. Calculate the age of the old wood.
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