Class 7 Science Chapter 1 NCERT Solutions Hinglish mein: The Ever-Evolving World of Science

Curiosity Grade 7 (Reprint 2026-27) ke Chapter 1, The Ever-Evolving World of Science, ke har sawaal ke jawab. Chapter ke ant mein koi exercise nahi hai; ye saal ki jhalak ke roop mein apne text mein kai sawaal poochhta hai, aur ismein ek activity hai, Activity 1.1, Question the Answer. Page numbers kitaab ke hisaab se hain (pages 1–6). Chhote notes: Chapter 1 ke notes.

Padaarthon ke sawaal (pages 2–3)

Kuch phal khatte kyun hote hain? Nimbu, kachcha aam aur imli jaise khatte phalon mein acid hote hain. (Extra: nimbu aur santre mein citric acid hota hai, imli mein tartaric acid.) Chapter 2 acidic, basic aur neutral padaarthon ko khojta hai.

School uniform pe laga haldi ka daag dhone pe kya hota hai? Saabun se dhone pe peela daag laal-bhoora ho jaata hai. (Extra: haldi ek praakritik indicator hai, aur saabun ka ghol basic hota hai, isliye rang badalta hai; Chapter 2 iska kaaran batata hai.)

Bulb jalaane ke liye kaise padaarth chahiye? Cell ya battery, jodne waale taar aur bulb, poore ghere mein jude hue, aur aise padaarth jinse bijli guzar sake. Jin padaarthon se bijli guzarti hai unhe conductor kehte hain; Chapter 3 kai padaarth jaanchta hai, aur Chapter 4 unhe dhaatu aur adhaatu mein baantta hai.

Battery khatm hona, barf ka paani banna, phal ka pakna, chattaan ka kankad mein tootna: ye kaise badlaav hain?

• Battery ka khatm hona: chemical badlaav, jo aasaani se ulta nahi ho sakta.
• Barf ka paani banna: physical badlaav, jo jamaakar ulta kiya ja sakta hai.
• Phal ka pakna: chemical badlaav, jo ulta nahi ho sakta.
• Chattaan ka kankad mein tootna: physical badlaav (padaarth wahi rehta hai), jo waapas nahi jud sakta.

Inme se kuch garam karne pe hote hain, ya jaldi hote hain. Chapter 5 aise badlaavon pe hai, aur Chapter 7 garmi ke bahaav pe.

Jeevon ke sawaal (page 4)

Middle school ke saalon mein hamaara shareer itni tezi se kyun badalta hai? Ye kishoraavastha (adolescence) ke saal hain, jab shareer bachpan se badappan ki or badhte hue tezi se badhta aur badalta hai. Chapter 6 vikaas aur badlaav ke is padaav ko samjhaata hai.

Badhne ke liye jaanwaron ko kya karna padta hai? Khaana aur saans lena, aur khoon ko khaane ke poshak tatv poore shareer mein pahunchaane padte hain. Ye jeevan prakriyaayein Chapter 9 ka vishay hain.

Kya paudhon ko bhi khaana chahiye? Wo kaise paate hain? Kya wo saans lete hain? Kaise? Haan. Paudhe apne hare patton mein dhoop, paani aur carbon dioxide se apna khaana khud banaate hain, jise photosynthesis kehte hain. Wo saans bhi lete hain, patton aur doosre hisson ke nanhe chhedon se oxygen lekar. Dekho Chapter 10.

Samay, roshni aur aasmaan ke sawaal (pages 4–5)

Samay kaise naapte hain, aur koi cheez kitni tezi se hoti hai? Aaj ghadi aur watch samay naapti hain; unse bahut pehle log Sooraj se bani parchhaai ki jagah dekhte the. Koi cheez kitni tezi se hoti hai, ye is se naapte hain ki tay samay mein wo kitni door jaati hai ya kitni badalti hai. Dekho Chapter 8.

Parchhaai ke khel aur samay batane ke alaava roshni kyun zaroori hai? Roshni se hum dekh paate hain, raat mein padhne ke liye humne use banaane ke kai tareeke dhoondhe hain, aur roshni ki prakriti padhkar humne brahmaand ke baare mein bahut seekha hai. Dekho Chapter 11.

Parchhaai se grahan kaise banta hai, aur din-raat kyun hote hain? Dharti aur Chaand antariksh mein parchhaai daalte hain; jab ek ki parchhaai doosre pe padti hai, to grahan dikhta hai. Din-raat isliye hote hain kyunki Dharti apni dhuri pe ghoomti hai, aur sirf Sooraj ki taraf waala aadha hissa roshan hota hai. Chaand Dharti ke chakkar lagaata hai aur Dharti Sooraj ke; Chapter 12 in chaalon ko samjhaata hai.

Kya ye kamaal nahi ki hum insaan apni duniya ke baare mein hairaan ho sakte hain? Haan. Hairaan hone, sawaal poochhne aur vichaar jaanchne ki hamaari kshamta hi science ko sambhav banaati hai.

Activity 1.1: Question the Answer (pages 5–6)

Jo bhi rachnaatmak sawaal us jawab tak le jaaye, wo sahi hai; ye namoone hain.

• Just add some milk. “Meri chai bahut kadak aur garam hai, kya karoon?” “Halwa kadaahi mein chipak raha hai!” “Ye aata naram kaise karoon?”
• Because the cat’s teeth were crooked. “Billi ne oon ke gole pe aise ajeeb daant ke nishaan kyun chhode?” “Billi ki photo mein aisi mazedaar muskaan kyun aayi?” “Billi apna khilauna chooha theek se kyun nahi pakad paayi?”
• Don’t panic, I have my towel. “Maine poora jug paani desk pe gira diya!” “Tez baarish ho rahi hai aur ghar abhi das minute door hai.” “Bachche ne nahaane ka paani mujh pe uchhaal diya!”
• 42. “Saat keedon ke kul kitne pair hain?” (6 × 7 = 42) “Chhe hafton mein kitne din hote hain?” “Agar main roz 6 page padhoon, to ek hafte mein kitne page padhunga?”

Kitaab ka apna udaaharan dikhaata hai ki ye kyun kaam karta hai: jawab “Just make it half!” cake baantne, bahut lambe essay, envelope mein na samaane waali chitthi ya naachne ke liye bahut lambe gaane ke sawaal ka jawab ho sakta hai. Ek jawab ke liye kai sawaal sochna vaigyanik ki tarah sochne ka achha abhyaas hai. Aur padho scientist ki tarah sawaal kaise poochhein mein.