CBSE Class 10 Science Previous Year Questions

Is subject me PYQ kaise kaam aate hain

Class 10 Science ek hi paper me teen alag-alag mizaaj ke subject hain — Physics, Chemistry aur Biology — aur teeno se marks nikalne ka tareeka alag hai. Physics me numerical solve karne ki speed aur unit discipline chahiye, Chemistry me balanced equation aur reaction ka recall chahiye, Biology me exact terminology aur saaf labelled diagram chahiye. Sirf NCERT padh lene se ye pata nahi chalta ki ek hi line ko kitni gehrai tak ghuma kar poocha ja sakta hai. Previous year questions ka asli faida yahi hai — wo aapko har chapter ka depth level dikhate hain. Ek hi chapter, maan lijiye Electricity, kabhi seedha Ohm's law ka numerical banta hai aur kabhi ek case-based passage jisme resistors ka combination diya hota hai aur aapse equivalent resistance, current aur power teeno nikalwaye jaate hain. Ye farq sirf purane papers khud solve kar ke samajh aata hai, kisi summary se nahi.

Doosra bada faida PYQ ko uske marking scheme ke saath padhne me hai, aur Science me ye sabse zyada payback deta hai — kyunki yahan marks lagbhag hamesha tukdon me milte hain. Ek numerical me aam taur par formula likhna, values substitute karna, aur final answer with correct unit — teeno alag-alag credit hote hain. Matlab final answer galat hone ke baad bhi beech ke steps ke marks bach sakte hain, bashart ki aapne steps likhe hon. Isi tarah ray diagram, circuit diagram aur Biology ke labelled diagram ka credit answer ke text se alag hota hai: diagram bana diya to wo hissa aapka hai, chahe explanation chhoti ho. Chemistry me agar equation likhi par balancing reh gayi, to bhi poora question zero nahi hota. Jo student sirf final answer rat-ta hai wo yahi tukde-wale marks chhod deta hai. Isliye PYQ aur marking scheme ek saath padhiye — ye jodi content se zyada presentation sikhati hai, aur Science me presentation hi safe score aur borderline score ke beech ka farq hai. Exact step-wise split har question aur har session me alag hota hai, isliye kitne marks kis step ke hain ye apne downloaded marking scheme se hi confirm kijiye, kisi guide ke dawe se nahi.

Question types jo is subject me aate hain

• 1-mark MCQ — kaafi questions NCERT ki activities, in-text examples aur diagrams se milte-julte hote hain (jaise kisi solution ka pH range, reaction ka type pehchanna, ya kisi setup ka observation).
• Assertion-Reason — do statements, aur aapko decide karna hai dono sahi hain ya nahi, aur kya Reason, Assertion ko sahi explain karta hai. Asli trap tab hota hai jab dono statements alag-alag sahi hote hain par Reason ka Assertion se koi cause-effect rishta nahi hota. Isliye dono ko alag-alag verify kijiye, pehla sentence padh kar option mat chuniye.
• Case-based / source-based — ek chhota passage, table ya graph (current-voltage data, food chain, reaction observations) aur usi par based sub-questions, aksar internal choice ke saath. Data wale case me answer passage ke numbers se aana chahiye, memory se nahi.
• 2-mark "reason do" type — "Why does...", "Give reason", "What happens when..." — yahan cause chahiye, sirf observation nahi. "What happens when" me aksar observation aur balanced equation dono expected hote hain.
• 3-mark short answer with diagram — jaise reflex arc, nephron ka kaam, ya kisi reaction ka explanation uske equation ke saath.
• 5-mark long answer — multi-part, usually internal choice ke saath; aksar ek hi question me diagram, explanation aur example teeno maange jaate hain. Har part ko alag number dijiye, warna examiner ko aapka part dhoondhna padta hai.
• Numericals — mainly Electricity (Ohm's law, series aur parallel combination, power, heating effect) aur Light (mirror aur lens formula, magnification, power of lens, refractive index).
• Diagram-based — ray diagrams, circuit diagrams, magnetic field line patterns, aur Biology ke labelled diagrams.
• Chemical equation writing — balancing ke saath, state symbols (s), (l), (g), (aq) aur reaction conditions arrow ke upar.
• Practical / lab-skill based — NCERT lab activities ke observations par MCQ ya short questions (pH paper ka colour change, hard water me soap ka behaviour, compass se field ki direction, slide me dikhne wala stage).

Chapter-wise practice ka tareeka

Sabse pehle ek zaruri disclaimer: rationalisation ke baad Class 10 Science ka syllabus pehle se chhota hai, aur purane question papers me aapko aise questions milenge jo ab scope me nahi hain. Chapter-level par jin topics ko aam taur par hataya gaya bataya jaata hai unme Periodic Classification of Elements, Sources of Energy, Sustainable Management of Natural Resources aur Heredity ke saath aane wala Evolution portion shaamil hai — lekin ye list yahan se final mat maaniye. Scope session ke hisaab se badal sakta hai, isliye apne exact session ka official syllabus document kholiye aur uske against har chapter tick kijiye. Ek aur baat jo zyadatar log miss karte hain: trimming sirf poore chapters ki nahi hui, kuch retained chapters ke andar se bhi sub-topics nikale gaye hain. Matlab chapter ka naam syllabus me dikh jaane ka ye matlab nahi ki uske saare purane questions valid hain — milaan topic level par kijiye. Unit-wise marks distribution bhi guess mat kijiye; wo official syllabus document me diya hota hai aur wahi single source of truth hai.

Physics wale chapters (Light, Human Eye, Electricity, Magnetic Effects) — yahan practice ka return sabse zyada hai, kyunki answer objective hota hai: sahi ya galat. Ray diagrams ko dekh kar samajh lena kaafi nahi; blank page par memory se banaiye — concave mirror ke liye object ki har position (beyond C, at C, between F and C, at F, between F and P) aur har case ka image nature (real ya virtual, erect ya inverted, size) likhiye. Sign convention ke liye alag se ek page banaiye: mirror formula 1/v + 1/u = 1/f hai aur lens formula 1/v - 1/u = 1/f — sign pattern alag hai, aur isi ek jagah sabse zyada marks jaate hain. Magnification bhi alag hai: mirror me m = -v/u, lens me m = v/u, dono me m = h'/h. Power of lens P = 1/f me f metre me leni hai — cm diya ho to pehle convert kijiye, warna answer seedha 100 guna galat aata hai. Electricity me resistors ke alag-alag combinations khud bana kar solve kijiye, aur H = I²Rt, P = VI = I²R = V²/R lagate waqt dhyan rakhiye ki V us particular component ke aar-paar ka voltage hai, battery ka total nahi.

Chemistry wale chapters — Chemical Reactions me reaction types (combination, decomposition, displacement, double displacement, oxidation aur reduction) ko examples ke saath likh kar yaad kijiye, sirf definition se kaam nahi chalega. Balancing ki practice alag se kijiye aur ek rule pakka kar lijiye: balance karne ke liye coefficient badalte hain, formula ka subscript kabhi nahi — H₂O ko H₂O₂ bana dena sabse common self-goal hai. Acids, Bases and Salts me washing soda, baking soda, bleaching powder aur Plaster of Paris — inka formula, banane ka tareeka aur use ek table me likh lijiye, kyunki inhe alag-alag angles se poocha jaata hai. Metals and Non-metals me reactivity series, roasting aur calcination ka farq, refining ka diagram, aur corrosion. Carbon and its Compounds me homologous series, butane aur pentane ke structural isomers, soap-micelle ka concept aur ethanol-ethanoic acid ki reactions — ye chapter likh-likh kar hi aata hai, sirf padh kar nahi.

Biology wale chapters — yahan marks diagram aur exact terminology se aate hain. Life Processes ke nephron, human heart, stomata aur digestive system; Control and Coordination ka neuron aur reflex arc; Reproduction ke labelled diagrams — inhe baar-baar bana kar label kijiye. Terminology me approximation nahi chalti: "Bowman's capsule", "loop of Henle", "vena cava" jaise naam spelling ke saath yaad hone chahiye, warna label ka mark risk me chala jaata hai. Heredity me Mendel ke cross ko paragraph me likh kar nahi, cross diagram bana kar practice kijiye, aur ratios ki do alag lines yaad rakhiye — monohybrid me phenotypic 3:1 lekin genotypic 1:2:1, dihybrid me 9:3:3:1. Sex determination ka cross bhi isi tarah banaiye. Our Environment me food chain, trophic levels aur ten per cent energy transfer par calculation-type questions aate hain — inhe theory ki tarah nahi, numerical ki tarah practice kijiye.

Official papers kahan se lein

• cbse.gov.in — CBSE ki official site. Board ke previous years ke question papers yahin se milte hain, class aur subject ke hisaab se. Menu ka naam aur exact path time-to-time badalta rehta hai, isliye na mile to site ke apne search me "question paper" dhoondhiye.
• cbseacademic.nic.in — CBSE Academics. Yahan session-wise Sample Question Papers aur unki Marking Schemes milti hain. Marking scheme download zaroor kijiye — step-wise marks ka sahi andaza wahin se lagega.
• Isi Academics site par kuch sessions me Additional Practice Questions bhi publish hoti hain. Jab available hon, ye current pattern ke sabse kareeb ka practice material hota hai; na dikhein to maan lijiye ki us session ke liye nahi aayi.
• Current syllabus document bhi Academics site par hi milta hai — unit-wise weightage aur rationalised scope dekhne ke liye wahi authority hai. Sabse pehle yahi download kijiye, papers uske baad.

Galtiyan jo is subject me marks kaat ti hain

• Unit missing ya galat unit — numerical ka answer sahi, par A, ohm, W, J, m ya D nahi likha. Ye lagbhag har numerical me seedha nuksaan hai.
• Unit conversion chhod dena — cm ko m, mA ko A, minute ko second, aur lens ki focal length ko metre me convert kiye bina formula me daal dena. Board me galti aksar concept ki nahi, isi conversion ki hoti hai.
• Steps na likhna — seedha final answer likh dena. Given data, formula aur substitution alag lines me likhiye; galat answer par bhi step marks milte hain.
• Sign convention gadbad — concave mirror ki focal length positive likh dena, ya lens formula me mirror wala pattern laga dena. Har numerical shuru karne se pehle given values ke signs ek line me likh lijiye.
• Ray diagram me arrows aur labels missing — incident ray, reflected ya refracted ray, principal axis, F aur C mark nahi kiye to diagram adhoora mana jaata hai. Pencil aur scale use kijiye, freehand nahi.
• Equation balance na karna ya state symbols chhod dena — (s), (l), (g), (aq) aur conditions (heat, catalyst) arrow ke upar likhna expected hota hai. Aur balancing subscript badal kar mat kijiye.
• "Reason do" me statement repeat kar dena — question observation nahi, cause maangta hai. "kyunki..." wali ek line zaruri hai.
• Circuit diagram me symbol aur placement ki galti — ammeter series me aur voltmeter parallel me, dono apni polarity ke saath. Galat placement se diagram ka poora mark jaata hai.
• Biology diagram bahut chhota banana ya label lines cross karna — diagram theek-thaak size ka rakhiye, label lines seedhi aur ideally ek hi taraf, aur spelling sahi.
• Hataye gaye topics par time dena — purane paper se aisa question uthana jo ab syllabus me hai hi nahi. Har old paper solve karne se pehle uske questions apne syllabus document se tick kijiye.

FAQs

Class 10 Science ke liye kitne saal ke previous year papers karne chahiye?

Quantity se zyada method matter karta hai. Chaar-paanch saal ke official papers, har ek ko marking scheme ke saath, kaafi hain — bashart ki aap unhe timed condition me likhein aur apni galtiyon ki list banayein. Bees papers bina check kiye solve karne se do papers theek se analyse karna behtar hai. Jo papers purane pattern ke hain ya hataye gaye topics se bhare hain, unme se sirf relevant questions uthaiye.

Sirf PYQ se padh lein ya NCERT bhi zaroori hai?

NCERT base hai, PYQ test hai — dono alag kaam karte hain. Class 10 Science ke bahut saare objective questions NCERT ki activities, in-text questions aur diagrams ke aas-paas ghoomte hain, isliye NCERT chhodna mehnga padta hai. Sahi order ye hai: pehle chapter NCERT se, phir usi chapter ke PYQ, phir jo galat hua use wapas NCERT me dhoondh kar theek karna.

Numericals PYQ se practice karne ka best tareeka kya hai?

Electricity aur Light ke saare numericals ek alag notebook me chapter-wise collect kijiye, aur har numerical me teen cheezein alag likhiye — given data with units, formula, phir substitution. Ek baar solve karne ke baad answer dekh kar aage mat badhiye; do din baad wahi numerical bina dekhe dobara solve kijiye. Galti aksar concept ki nahi hoti, sign convention aur unit conversion (cm se m, mA se A) ki hoti hai, aur wo dobara solve karne par hi pakadi jaati hai.

Diagrams ke liye previous year papers kaise use karein?

Papers me se sirf wo questions chhaant lijiye jinme diagram maanga gaya hai, aur ek "diagram list" bana lijiye — ray diagrams, circuit diagrams, aur Biology ke labelled diagrams. Phir har diagram blank page par bina dekhe banaiye aur label kijiye, uske baad NCERT se milaiye. Yehi ek practice hai jo Science me sabse tez marks badhati hai, kyunki diagram ka credit answer ke text se alag hota hai.

Sample paper aur previous year paper me se pehle kya karein?

Pehle latest sample paper, kyunki wahi current pattern aur question typology dikhata hai, aur uski marking scheme se aapko step-wise marks ka sense milta hai. Uske baad previous year papers, depth aur variety ke liye. Dono official CBSE aur CBSE Academics site par free milte hain, isliye kisi third-party compilation par depend karne ki zarurat nahi — aur third-party set me hataye gaye topics ke questions reh jaane ka risk alag hota hai.

Question papers ka copyright CBSE ke paas hai — hum yahan sirf official sources ke links dete hain, PDFs host nahi karte. NCERT Kaksha kisi board se affiliated nahi hai.