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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 →- The temperature of a gas is -50^° C. To what temperature the gas should be heated so that the rms speed is increased by 3 times? Correct option: (3) 3295^° C The rms speed of gas molecules is v_rms=√(3RT/M) , so v_rms∝sqrt T (T in kelvin). \"Increased by 3 times\" mean... 1
- A wheatstone bridge is used to determine the value of unknown resistance X by adjusting the variable resistance Y as shown in the figure. For the most precise measurement of X, the resistances P and Q : Correct option: (3) should be approximately equal and are small In a Wheatstone bridge, X=Q/P Y at balance. The measurement is most precise... 1
- When two monochromatic lights of frequency, and /2 are incident on a photoelectric metal, their stopping potential becomes V_s/2 and V_s respectively. The threshold frequency for this metal is : Correct option: (1) 3/2ν Einstein's photoelectric equation: eV_s=hν-hν₀=h(ν-ν₀) . So the stopping potential is proportional to (ν-ν₀) . Ligh... 1
- Two hollow conducting spheres of radii R_1 and R_2 (R_1 >> R_2) have equal charges. The potential would be : Correct option: (3) more on smaller sphere For a charged conducting sphere, the charge sits on the outer surface and the potential of the sp... 1
- Which of the following graph represents the variation of resistivity (ρ) with temperature (T) for copper ? Correct option: (3) graph (3) For a metal like copper, resistivity increases with temperature. Heating makes the lattice ions vibrate more s... 1
- A hollow metal sphere of radius R is uniformly charged. The electric field due to the sphere at a distance r from the centre : Correct option: (2) zero as r increases for rlt R , decreases as r increases for rgt R Use Gauss's law with a spherical Gaussian surface of... 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...