खालील विधाने सत्य की असत्य ते लिहा. i. विखंडन (fission) अभिक्रियेमध्ये जड युरेनियम अणू वापरतात. ii. विखंडन (fission) अभिक्रियेमध्ये खूप ऊर्जा बाहेर पडते. iii. विखंडन अभिक्रियेमध्ये जड अणू विभागतात. iv. विखंडन अभिक्रियेमध्ये न्युट्रान्समुळे श्रृंखला अभिक्रिया घडते.
This MPSC previous-year question is drawn from MPSC Group B Combined Pre 2026 (Marathi). It belongs to the Science section and is reproduced here in Marathi exactly as it appeared in the official Maharashtra Public Service Commission paper, along with the four options, the official Set A answer key and a compact explanation of why the correct option is correct.
Correct answer: B
Explanation
बरोबर पर्याय B आहे. विखंडनाबाबतची चारही विधाने बरोबर — जड युरेनियम अणू वापरले जातात, मोठ्या प्रमाणात ऊर्जा मुक्त होते, अतिरिक्त न्यूट्रॉन बाहेर पडतात आणि साखळी अभिक्रिया चालते — म्हणून 'खरे, खरे, खरे, खरे' हा पर्याय योग्य.
Why this question matters
Questions of this type recur almost every year across MPSC Group B, Group C, PSI and Gazetted Civil Services prelims because science carries a high, stable weightage in the syllabus. Practising the original paper wording — rather than paraphrased mock questions — is the fastest way to internalise MPSC's option-framing style and the specific way its examiners plant trick choices.
How to attempt this in the exam
Watch for negation traps — words like "not", "except", "incorrect" that flip the intent of the question. MPSC deliberately embeds them in science items to catch aspirants who read the question in a hurry. Re-read the stem with a mental highlight on any negation word before selecting an option.
Subject-specific tip
Tip for Science: write the underlying formula or chemical equation in the margin. MPSC Science numericals are usually one-step substitutions; the trap is in the units, not the concept.
Science in exams — the six-quadrant map
Think of MPSC Science as a six-quadrant map: (1) Cell biology and biomolecules (DNA, RNA, proteins, cell division); (2) Human physiology and diseases; (3) Plant biology and classification; (4) Physics numericals (motion, electricity, sound, light); (5) Chemistry facts (elements, compounds, everyday products); (6) Applied science and current science affairs. Aspirants who allocate roughly equal attention to each quadrant score more consistently than those who over-invest in one area.
For physics numericals, three formulas do most of the heavy lifting: v = u + at (kinematics), V = IR (Ohm's law), and W = Fs cos θ (work). MPSC rarely pushes beyond one-step substitutions, so identifying which formula applies is more than half the battle. The trap is usually in the units — write the SI unit next to every variable before you compute.
For biology classification, the two mnemonics that carry the most weight are the five-kingdom system (Monera, Protista, Fungi, Plantae, Animalia) and, within Animalia, the nine phyla in evolutionary order (Porifera, Cnidaria, Platyhelminthes, Nematoda, Annelida, Arthropoda, Mollusca, Echinodermata, Chordata). Being able to place any organism in the correct kingdom-and-phylum eliminates two options instantly.
Source and editorial process
Source: MPSC Group B Combined Pre 2026 (Marathi). This question, its four options and the marked correct answer are transcribed verbatim from the official Maharashtra Public Service Commission Set A paper. Our editorial team cross-checks each question against the original PDF released on mpsc.gov.in and against the corresponding official answer key.
We never paraphrase the wording. Where MPSC has issued a revised key after an objection round, the answer highlighted above reflects the revised key and the revision is logged in our internal change-log. If you spot a discrepancy, please email us at dontknowacademy@gmail.com — we acknowledge every report within 24 hours and push a fix within 48 hours.
Related study material
Deepen your preparation on this topic with our long-form MPSC study guides. Every guide is written specifically for the Maharashtra Public Service Commission preliminary syllabus and takes twelve to sixteen minutes to read in full.
- MPSC Exam PatternGroup B, Group C, PSI, Gazetted CS & TS prelims — marks, syllabus, negative marking, cut-offs.
- MPSC Preparation Strategy6-month plan, book list, daily routine, PYQ usage, mock-test strategy.
- Indian Polity for MPSCConstitution, Fundamental Rights, DPSPs, Parliament, state government, key amendments.
About MPSC PYQ QUIZ
MPSC PYQ QUIZ is a free educational platform by Don't know Academy that helps Maharashtra Public Service Commission aspirants practise with the complete archive of previous-year questions. Every paper on the site is sourced from the official MPSC release, tagged by subject and topic, and paired with the official Set A answer key. The platform is independent and not affiliated with MPSC, the Government of Maharashtra or any government body — please read our Disclaimer for the full statement.