Dainik Vigyan Pariksha 20-20 (दैनिक विज्ञान परीक्षा 20-20), written by Dr Rajeev 'Lekhak' and published by Disha under its Gyan Sangrah Series, is a Hindi-medium everyday science book for Rajasthan competitive examinations. The complete book is written in Hindi (Devanagari script), so aspirants preparing in the Hindi medium can study the subject in their own language. This is the 12th revised and modified edition (12वाँ परिमार्जित एवं परिवर्तित संस्करण). The book gives chapterwise explanations of questions asked from 1992 to August 2026 (अध्यायवार परीक्षा (1992-अगस्त 2026) प्रश्नों की व्याख्या), so an aspirant sees more than three decades of actual questions organised by topic rather than by paper. It also presents the substance of the RBSE and NCERT textbooks in question-and-answer form (RBSE/NCERT पाठ्यपुस्तकों का सार प्रश्नोत्तर रूप में), which is where the science questions in these examinations are ultimately set from. It is prepared for CET, REET, RAS, PSI, Grade I, II and III Teacher, LDC, Constable and Laboratory Assistant examinations. Key Features: Written entirely in Hindi (Hindi medium) for Rajasthan competitive examination aspirants Dainik Vigyan (Everyday Science) for competitive examinations 12th revised and modified edition Chapterwise explanations of questions asked from 1992 to August 2026 RBSE and NCERT textbook content presented in question-and-answer form Fast Track of Success approach For CET, REET, RAS and PSI examinations For Grade I, II and III Teacher, LDC, Constable and Lab Assistant By Dr Rajeev 'Lekhak', from the Disha Gyan Sangrah Series यह पुस्तक "दैनिक विज्ञान परीक्षा 20-20" डॉ. राजीव 'लेखक' द्वारा लिखित है तथा दिशा (ज्ञान संग्रह सीरीज़) द्वारा प्रकाशित है। यह पूर्णतः हिंदी भाषा (Hindi medium) में है। यह 12वाँ परिमार्जित एवं परिवर्तित संस्करण है। इसमें वर्ष 1992 से अगस्त 2026 तक पूछे गए प्रश्नों की अध्यायवार व्याख्या तथा RBSE/NCERT पाठ्यपुस्तकों का सार प्रश्नोत्तर रूप में दिया गया है। यह CET, REET, RAS, PSI, ग्रेड I, II व III शिक्षक, LDC, कॉन्स्टेबल तथा प्रयोगशाला सहायक परीक्षाओं के अभ्यर्थियों के लिए अत्यंत उपयोगी है।