Last seen: Jan 13, 2022
(4) (A) > (D) > (C) > (B) Explanation: pH of 0.01 M HCl = 2 pH of 0.01 M NaOH = 12 pH of 0.01 M CH3COONa > 7 pH of 0.01 M NaC...
(3) safe for teeth Explanation: Soluble fluoride is often added to drinking water to make concentration upto 1 ppm because F– ions make the enamel...
hcm = 3R/8 = 3 x 8/8 = 3 cm
I = I0cos2 φ/2 = kcos2 (π/λ x λ/6) = kcos2(π/6) = 3k/4 = 9k/12 n = 9
(1) (5.54 ± 0.07) mm Explanation: Least count in 0.01 mm.
(2) 1/√T Explanation: τ = λ/Vrms τ ∝ 1/√T
(3) 0.73 Explanation: 2s.png tan = 60° = vrg/v .....(1) tan 45° = vrg/(1 + β)v ....(2) √3v = (β + 1)v β = √3 - 1 = 0.732
(2) K1 : K3 = 2 : 3 Explanation: K1 : K3 (100 – 70) = K2(70 – 20) = K3(20 – 0) K130 = K2(50) = K3(20) => K1 : K3 : K2 : K3 = 10 : 6 : 15...
ρ = m/{4/3π(d/2)3} ρ = 6m/πd3 taking log ℓnρ = ℓnm - 3ℓnd Maximum error by differentiation dρ/ρ = dm/m + 3 dd/d dρ/ρ = 6 + 3 x 1.5 = 10....
2s.png Momentum conservation along x direction 2mv cosθ = (2m) v/2 cosθ = 1/2 cosθ = 60° then angle between their initial velocities = 120...
Vp - L dI/dt - 30 + RI = VQ Vp - VQ = + 50 x 10-3 x 102 + 30 - 1 x 2 = +5 + 30 - 2 = 33
(1) 5 × 10–3T, along + z-direction Explanation: qVB = qE B = E/V = 30000/6 x 106 = 5 x 103 Magnetic force F = q(V x B) So, 5 × 103 T, along ...
(3) Positive 10 μm Explanation: Circular scale is 4 unit ahead means screw gauge has positive zero error = 4 × 10 μm = 40 μm Least count = 0....
(4) U = 5/2 RT and γ = 7/5 Explanation: f = 5 γ = 1 + 2/f = 1 + 2/5 = 7/5 Cp/Cv = 7/5
2s.png I = M(ℓ/√2)2 + m√2ℓ)2 = 3 mℓ2
(1) 1.33 × 106 Explanation: E = Δmc2 = (1.0079 + 7.0160 – 2(4.0026) × 931 = 1.33 × 106
(1) 0.20 m Explanation: 2s.png mg sinθ = μmg cosθ tanθ = μ = 0.75 => θ = 37 cosθ = R - h/R cos37 = 1 - h/1 => h = 0.2
(1) 10–3 Explanation: The instantaneous acceleration of tip is given by ac = ω2R = (2π/60)2 x 0.1 = 1/900 ≈ 10–3
(2) (2B/A)1/6, A2/4B Explanation: U = A/r6 + B/r12 f = - dU/dr For equilibrium So r = (2B/A)1/6, A2/4B
(4) f = 1/2π√YA/mL Explanation: f = f = 1/2π√k/m = 1/2π(√(YA/mL)