All questions
- 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
- Explain the construction and working of the following. Draw a neat diagram and label it. a. Electric motor b. Electric Generator(AC) A) Electric motor The electric motor consists of rectangular loop of copper wire having resistive coating. As shown in the figure, it is pla... 1
- Fuse wire, bad conductor, rubber gloves, generator. b. Voltmeter, Ammeter, galvanometer, thermometer. a. Fuse wire, bud conductor, rubber gloves, generator. Answer: Generator. It converts mechanical energy into electric energy, the remaining... 1
- There are 6 batsmen, 7 bowlers and 2 wickets keepers. Find the number of ways of forming Team Size =11 players Case 1: 4 batsmen and 5 bowlers and 2 wicket-keepers ⇒ ⁶C_(4 )× ⁷C₅ × ²C₂ = (6×5/2) × (7×6/2) × 1 = 315 Case 2: 4 bats... 1
- 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
- The initial velocity vi required to project a body vertically upward from the surface of the earth to reach a height of 10R, where R is the radius of the earth, Correct answer is 10 1
- The radius in kilometer to which the present radius of earth (R = 6400 km) Correct answer is 64 km Explanation:: 1
- which of the following is most easily economically refined by fractional distillation Correct option is A) Zn 2
- If P4O10 + HNO3 are mixed in 1:4 ratio , then nature of nitrogen oxide obtained will be 4HNO₃ +P₄ O₁₀ →2N₂ O ₅+4HPO_(3 ) and N₂O₅ is acidic in nature 1
- What is disproportionate ? in chemistry A disproportionation reaction is one in which a species has been both oxidised and reduced (that is, the oxidation state of the related spec... 1
- 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
- find the coefficient of x^256 in [1-x]^101 x (x^2+x+1)^100 Correct answer is ¹⁰⁰C₈₅ or ¹⁰⁰C₁₅ 1
- 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
- With increase of temperature, which of these changes? JEE Option C is correct molarity Temperature has no effect on mass but it has significant effect on volumes. Hence molality, mole fraction, mass... 1
- If both FeX2 & FeY3 are found to exist, X & Y can be : (1) X = F, Cl, Br, I Y = F, Cl, Br (2) X = Cl, Br, (1) X = F, Cl, Br, I :: Y = F, Cl, Br is the correct option Explaination:: FeI₃ does not exist as I^(–) reduces Fe³⁺ to Fe²⁺. 2Fe³⁺ + 2I – →... 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