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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
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See all →- 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
- Identify the Figures of Speech in the following lines.(a) I stand and look at them long and long.(b) They do not sweat and whine about their condition.(c) They do not make me sick discussing their duty to God.(d) ...not one is demented with the mania… Repetition (‘long and long’); also Alliteration of the ‘l’ sound Alliteration (the ‘th’ sound in ‘They’, ‘their’); the line indirectly contr... 2
- mathematics question paper board SSC board All the recent Maharashtra SSC (10th) Mathematics board papers are on Doubtly, free, with a full step-by-step solution for every question. M... 2
- Which one of the following equations represents the Verhulst-Pearl Logistic Growth of population? Answer: 2. dN/dt = rN((K - N)/K) Key idea: The Verhulst-Pearl logistic equation includes the carrying capacity K. dN/dt=rN(K-N/K) When N is... 1
- The blue and white selectable markers have been developed which differentiate recombinant colonies from non-recombinant colonies on the basis of their ability to produce colour in presence of a chromogenic substrate.Given below are two statements abo… Answer: 4. Statement I is incorrect but Statement II is correct Key idea: Insertional inactivation of the lacZ gene (β-galactosidase). In a... 1
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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...