Every textbook question, solved the way the board expects.
Popular board questions
See all →- A and B each have certain number of oranges. A says to B, “ if you give me 10 of your oranges, Suppose A has x no. of oranges and B has y no. of oranges. According to the given conditions, we have x+10=2(y−10)⇒x−2y+30=0 (i) and, y+10=x... 1
- std 10th maharashtra board science part 1 gravitation notes Answer: Gravitation (Std 10 Science Part 1, Chapter 1) - solved exercise notes. 1. Match the entries and rewrite them in correct rows Quanti... 2
- M.In two moles of acetaldehyde (CH3 CHO) calculate the following a. Number of moles of carbon b. Number of moles of hydrogen Answer: (a) 4 mol C, (b) 8 mol H, (c) 2 mol O, (d) 1.2044 × 10²⁴ molecules Molecular formula of acetaldehyde: CH₃CHO = C₂H₄O. One molecule (... 1
- Niobium forms bcc structure the density of niobium is 8.55 g/cm3 and length of unit cell edge Answer: In 0.5 g of niobium there are 1.62×10²¹ unit cells and 3.24×10²¹ atoms. Given: bcc so n = 2 atoms per unit cell, ρ = 8.55\ g cm⁻³ ,... 2
- The density of iridium is 22.4 g/cm3 . The unit cell of iridium is fcc. Calculate the radius of iridium atom. Molar mass of iridium is 192.2 g/mol. Answer: Radius of iridium atom r ≈ 136\ pm (edge length a ≈ 385\ pm ) Given: ρ = 22.4\ g cm⁻³ , M = 192.2\ g mol⁻¹ , fcc unit cell so n = 4... 1
- E. A student used a carbon pencil to write his homework. The mass of this was found to be 5 mg. With the help of this calculate. Given : mass of carbon = 5mg = 5× 10⁻³ g Atomic mass of carbon=12u Solution :: a. The number of moles of carbon in his homework writing numb... 1
Recently answered
See all →- Write the structural formula of N, N-dimethylethanamine. Answer: CH₃−CH₂−N(CH₃)₂ Ethanamine is CH₃CH₂NH₂; both H atoms on nitrogen are replaced by methyl groups, giving the tertiary amine CH₃CH₂−N(... 2
- Are the four points A(1,2,1),B(2,-3,4),C(3,4,-5),D(2,3,-2) coplanar? Justify your answer. Yes, the four points A, B, C and D are coplanar, because the scalar triple product of overrightarrowAB , overrightarrowAC and overrightarrow... 1
- When there is no Partnership Agreement between partners, the division of profits takes place in ____ ratio. Answer: A. equal Answer: (a) equal As per the Indian Partnership Act, 1932, in the absence of an agreement, partners share profits and losse... 2
- write notes on Industrial waste. Industrial waste: Industrial waste is the waste that is produced from industries during the manufacturing process. For example pieces of met... 2
- What are eddy currents? State it's two application Eddy currents are induced currents that flow in closed, circular paths inside the body of a solid conductor (a metal plate, disc or core) wh... 2
- Give me question paper Here are the official Maharashtra SSC (10th) Science and Technology board papers on Doubtly. You can read each paper or take it as a timed t... 1
Latest notes
See all →- How to Use NEET Previous Year Questions: A 4-Month Plan A month-by-month plan to use NEET previous year questions: unit-wise practice, timed sectionals, full mocks, a mistake notebook and a syllab...
- NEET Previous Year Papers 2016–2025: What 10 Years of Questions Show We tagged 2,060 questions from official NEET papers 2016–2025. See which Physics, Chemistry and Biology units grew or shrank, and what staye...
- Topics Removed from the NEET Syllabus (and How Many Questions They Had) All topics removed from the NEET syllabus, with how many questions each had in official 2016–2025 papers, and how to practise old papers.
- NEET Chapter-wise Weightage (2016–2025) from 2,060 Official Questions Unit-wise NEET weightage for Physics, Chemistry and Biology from 2,060 official questions (2016–2025), plus the top 20 topics and how to pla...
- NEET 2027 Syllabus: What Is Official Now and What to Expect Is the NEET 2027 syllabus out? Not yet. Here is the official NMC 2026 syllabus with all 50 units, what to expect for 2027 and how to use it.
- SSC Class 10 Board Exam 2027: 4-Month Study Plan (Nov–Feb) A month-by-month plan for the Maharashtra SSC board exam 2027: daily routine, subject-wise tips, how to use board papers, and free practice...