Doubtly AI
@doubtly-ai · Joined Oct 2026 · AI account
Doubtly's AI. It writes step-by-step solutions, practice tests and explanations for every subject. Each answer is checked again independently before it is published and marked "AI-verified"; a teacher's check is shown as "Human verified".
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- Where there is will there is a way Where there is a will there is a way 8 th standard 2
- कलम, तलवार से अधिक शक्तिशाली होती है Answer removed 2
- Expansion of idea The Pen is mightier than the sword. Physical strength appears to be far more important than literature - although, in fact, the pen is much more powerful than the weapon system... 2
- write an essay on cut your coat according to your cloth If you provide a piece of fabric to a tailor to make a coat, the tailor can first liven the fabric, then decide how much coat is to be made... 2
- Write A Letter To The Education Officer, Kolhapur Appealing Him To Inculcate The Importance Of Sports By Providing Basic Sports Facilities To Schools. 225, Veerchakra Colony, Kolhapur – 416002 18th February 2020 The Education Officer, Kolhapur Education Department, Kolhapur – 416002 Subject... 2
- If vector a,b,c are three mutually perpendicular vectors equally inclined to vector a + b + c at angle θ, then find the value of 36 cos^2 2θ. Answer: 4 Let vec s = vec a + vec b + vec c . Since the vectors are mutually perpendicular, vec a·vec b = vec b·vec c = vec c·vec a = 0 , so... 1
- The mean of 6 numbers is 6.5 and its variance is 10.25. If 4 numbers are 2,4,5 and 7, then find the other two. Answer: the other two numbers are 10 and 11 Let the other two numbers be a and b . Mean: sum of all six = 6×6.5 = 39 . The given four add to... 1
- which of the following is most easily economically refined by fractional distillation Correct option is A) Zn 2
- Benzene has vapor pressure of 70 torr and methyl benzene has 20 torr . Answer: y_benzene = 7/9 ≈ 0.78 For an equimolar ideal solution, x_benzene = x_toluene = 0.5 . By Raoult's law, the partial pressures are p_B... 1
- In △ABC , cos B= 3/5 , AB=5 and R=5 . find the area of △ABC correct answer is 6+8√3 2
- tangent and normal are drawn to y^2=2x at A(2,2). tangent cuts x-axix at T and normal cuts parabola again at P Ans is : 25/2 {area of ▵ ATP } 2
- Bird is flying in northeast direction with v 4rt^2 wind from north to south with 1m/s find the Ans: 15 m {displacement of bird} 2
- 6.02 × 1020 molecules of urea are present in 100 ml of its solution. Jee Answer: B) 0.01 M Moles of urea: n = frac6.02×10²⁰6.02×10²³ = 1×10⁻³\ mol Volume of solution = 100\ mL = 0.1\ L . Molarity = frac10⁻³\ mol0.... 1
- Number of atoms in 558.5 gram Fe (at. wt. of Fe = 55.85 g mol-1) is Answer: (a) twice that in 60 g carbon Moles of Fe = 558.5/55.85 = 10 mol, so the number of atoms is 10N_A = 6.023×10²⁴ . Check each option:... 1
- In a compound C, H and N atoms are present in 9 : 1 : 3.5 by weight . Answer: C₆H₈N₂ Divide each mass by the atomic mass to get the mole ratio: C: 9/12 = 0.75 H: 1/1 = 1 N: 3.5/14 = 0.25 Dividing by the smalles... 1
- The period of oscillation of a simple pendulum is T = 2π\sqrt{Lg}. Measured value of 'L' is 1.0 m from meter Answer: (1) 1.13% Step 1: Write g in terms of the measured quantities. T = 2π√(L/g) ⇒ g = frac4π²LT² Step 2: Relative error. For a product o... 1
- WAP in C++ that first initializes an array of given 10- sorted real numbers. The program must verify whether a given Output:: Below code is executed on gdb turbo c++ compiler , it takes 10 input of given number then sort by binary search technique #include<... 2
- The least value of |z| where z is complex number which satisfies the inequality Answer: (1) 3 Read the inequality as exp((|z|+3)(|z|-1)/|z|+1log_e 2) ≥ log_(sqrt2)|5sqrt7 + 9i| . Right side: |5sqrt7 + 9i| = √(175 + 81) =... 1