Last seen: Jan 13, 2022
Correct answer: (3) 100 mL of 0.1 M HCl and 200 mL of 0.1 M CH3COONa Explanation: Mixture of weak acid and its salt with strong base acts as buffe...
Correct answer: (1) The diameter of dispersed particles is similar to the wavelength of light used. Explanation: The diameter of the dispersed par...
Correct answer: (1) Ionic mobilities of ions from both salts increase with T. Explanation: (i) Ionic mobilities decrease with increase in temperat...
Correct answer: (4) A zero-order reaction is a multi step reaction Explanation: Zero order reaction is always multi step reaction.
Correct answer: (2) Acid rain Explanation: burning of fossil fuels (which contain sulphur and nitrogenous matter) such as coal and oil in power st...
Correct answer: (2) 109 Explanation: un = 1 nil = 0 enn = 9 So Atomic number = 109
Q2 = mL = 8000 w/Q2 = Q1 - Q2/Q2 = T1 - T2/T2 Q1 - 8000/8000 = 27/273 Q1 = 8791
Correct answer: (4) -1 Explanation: Velocity of image vi = - v2/u2 x v0 = - 102/302(9) = -1 cm/sec
Correct answer: (3) Multimeter shows NO deflection in both cases i.e. before and after reversing the probes if the chosen component is capacitor.
Correct answer:(2) 1/500 Explanation: Ps - Power of source Ps = n hc/λ ; n = no. of photons emitted /s => n ∝ λ => n2/n1 = λ2/λ1 = 1/500
Correct answer:(2) ML0T-3 Explanation: Solar constant = Energy/Time Area = M1L2T–2/TL2 = ML0T-3
Correct answer:(4) 3.1 eV Explanation: λ = 400 nm Band gap Eg = hc/λ = 1237.5/400 = 3.09 eV
Correct answer: (1) 1 : 2 Explanation: qV = 1/2mv2 Hence v ∝1/√m vH/vHe = √4/1 = 2 : 1
Correct answer: (2) 1/√2 Explanation: Remaining energy 1/2(1/2KA2) = 1/2 KA'2 A' = A/√2
Correct answer: (1) 2 Explanation: (200) (31 – 25) = m × 540 + m(1) (69) 1200 = m(609) m ≈ 2
Correct answer: (1) 21 J Explanation: Conservation of linear momentum 0.1 × 20 = (0.1 + 1.9) × v v = 1 m/s Using work energy theorem Wg = Δk...
From work energy theorem F(0.2) - mg(20) = 0 F = mg(20)/0.2 = mg(200/2) = 0.15 x 10 x 200/2 = 150.00 N
Correct answer: (1) 6 μC and 3μC Explanation: Total charge = 12 – 3 = 9μC If final charges are q1 and q2 q1/q2 = R1/R2 = 2/1 q1 = 6 μC q2 ...
Correct answer: (3) 0.57º Explanation: β0 = λ/d = 500 x 10-9/5 x 10-5 = 10-2 Radian = 0.57º
Correct answer: (1) 2.124 cm Explanation: Thickness = M.S. Reading + Circular Scale Reading (L.C.) Here, LC = 0.1/50 = 0.002 cm per division