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Half Life Questions

Practice 11 Half Life questions with detailed answers and explanations. Free MCQs, PYQs, and mock test questions for NEET, JEE, GATE, SSC and more.

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11
Total Questions
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3
Easy
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7
Medium
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1
Hard
Practice by Exam:Chemistry(6)Physics(5)

About Half Life — practice questions, PYQs & concepts

Half Life is a frequently-tested topic on Chemistry, Physics. ExamTest.live currently lists 11 Half Life questions spanning previous-year papers from 2026 to 2026, each with worked solutions and a step-by-step explanation. Use the filters on this page to focus on a specific exam, difficulty level or year — every answer key is free, no sign-up required.

Half Life weight in competitive exams

Across our Half Life question bank, the largest sources are Chemistry (6) and Physics (5). Click any exam chip above to drill down to that exam-specific question set.

How to use this page

  • Start easy: 3 easy Half Life questions are available — build fluency before moving up.
  • Target weak years: Use the year filter to focus on the most recent 2026 paper or older PYQs you have not attempted.
  • Time yourself: Every question shows the average solve time so you can benchmark your speed against other students.
  • Read every explanation: Even on questions you got right — the explanation often surfaces a faster approach you can reuse.

All Half Life Questions(1–11 of 11)

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Q1mediummcqChemistryNEET (UG) 20172026
0% accuracy
A first order reaction has a specific reaction rate of . How much time will it take for of the reactant to reduce to ?
Q2easymcqPhysicsNEET (UG) 20182026
For a radioactive material, half-life is minutes. If initially there are number of nuclei, the time taken (in minutes) for the disintegration of nuclei is:
Q3mediummcqChemistryNEET (UG) 20182026
The correct difference between first and second order reactions is that:
Q4easymcqChemistryNEET (UG) 20182026
When initial concentration of the reactant is doubled, the half-life period of a zero order reaction:
Q5mediummcqPhysicsNEET 20212026
A half-life of a radioactive nuclide is hours. The fraction of original activity that will remain after hours would be:
Q6mediummcqPhysicsAIEEE 20032026
A radioactive sample at any instant has its disintegration rate . After , the rate is . Then, the decay constant (per minute) is:
Q7mediummcqChemistryAIEEE 20042026
The half – life of a radioisotope is four hours. If the initial mass of the isotope was , the mass remaining after hours undecayed is:
Q8easymcqChemistryChemistry
Half life period of a first-order reaction is . The specific rate constant of the reaction is:
Q9hardmcqPhysicsPhysics
The activity of a radioactive sample is measured as at and at . The time (in minutes) at which the activity reduces to half its value is:
Q10mediummcqChemistryChemistry
The half life of an enzyme-catalysed reaction is . The time required for concentration to fall from to is:
Q11mediummcqPhysicsPhysics
A mixture consists of two radioactive materials and with half-lives of and respectively. Initially the mixture has of and of . The amount of the two in the mixture will become equal after:

Frequently Asked Questions

How many Half Life questions are on ExamTest.live?▼
We have 11 Half Life questions spread across 1 pages, covering easy, medium, and hard difficulty levels with detailed explanations.
Are Half Life MCQs free?▼
Yes. All Half Life questions, answers, and explanations on ExamTest.live are completely free. No account or subscription required.
Which exams include Half Life questions?▼
Half Life questions are commonly asked in Chemistry, Physics. You can filter by exam using the links above.
How do I practice Half Life questions effectively?▼
Start with easy questions to build confidence, then tackle medium and hard ones. Use the filter buttons to sort by difficulty. Reveal the answer only after attempting each question, and read the explanation thoroughly.