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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
- 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
- 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
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See all →- Activity Prepare a temporary mount of one drop of pond water on a glass slide. Answer: Pond water seen under the microscope shows many tiny living organisms such as Amoeba, Paramecium and Euglena, and algae such as Chla... 1
- Solve the following assignment problem for minimization :IIIIIIIVV1182419202321921201822322232021234201821191951822232221Solution :Step-I : Subtract the smallest element of each row from every element of that rowIIIIIIIVV10612421320332301342031150454… Answer: 1 → I, 2 → IV, 3 → III, 4 → II, 5 → V; minimum value = 95 Row minima are 18, 18, 20, 18, 18, so the correct Step-I matrix has column... 1
- A bill of ₹ 18,000 was discounted for ₹ 17,568 at a bank on 25th October 2017. If the rate of interest was 12% p.a. what is the legal due date?Solution : Given SD = 18,000; CV = 17,568; r = 12% p.a.Now, BD = \(\square\)= 18,000 – 17,568= ₹ 432Also BD… Answer: Legal due date is 6th January 2018. Boxes in order: BD = SD - CV (face value minus cash value) BD =SD× n× r/100 (simple interest on... 1
- Find x if the cost of living index is 150 :GroupFoodClothingFuel and electricityHouse RentMiscellaneousI180120300100160W456x3 Answer: x=18 GroupIWIW Food1804720 Clothing1205600 Fuel and electricity30061800 House Rent100x100x Miscellaneous1603480 Total18 + x3600 + 10... 1
- The equations of two regression lines are \(10x-4y=80\) and \(10y-9x=-40\). Find(a) \(\bar{x}\) and \(\bar{y}\)(b) \(b_{YX}\) and \(b_{XY}\)(c) r(d) If var(Y) = 36, obtain var (X). Answer: x=10,\ y=5;\ b_YX=0.9,\ b_XY=0.4;\ r=0.6;\ var(X)=16 (a) The means satisfy both equations: 10x-4y=80 and -9x+10y=-40 . Multiplying t... 1
- Defects on plywood sheet occur at random with the average of one defect per 50 sq.ft. Find the probability that such a sheet has :(a) no defect(b) at least one defect(use \(e^{-1}=0.3678\)) Answer: (a) 0.3678 (b) 0.6322 Let X = number of defects on a sheet (of 50 sq. ft). X follows the Poisson distribution with m=1 : P(X=x)=frac... 1
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See all →- 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...
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