While measuring the speed of sound by performing a resonance column experiment, a student gets
the first resonance condition at a column length of 18 cm during winter. Repeating the same
experiment during summer, she measures the column length to be x cm for the second resonance.

(1) 18 > x
(2) x >54
(3) 54 > x > 36
(4) 36 > x > 18

Anonymous User Physics 20 Nov, 2020 1 Answer 64 views

Amount of oxalic acid present in a solution can be determined by its titration with KMnO4 solution in the presence of H2SO4. The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl

(1) gets oxidised by oxalic acid to chlorine
(2) furnishes H+ ions in addition to those from oxalic acid
(3) reduces permanganate to Mn2+
(4) oxidises oxalic acid to carbon dioxide and water

Anonymous User Chemistry 18 Nov, 2020 1 Answer 58 views

At 80 C, the vapour pressure of pure liquid ‘A’ is 520 mm Hg and that of pure liquid ‘B’ is 1000 mm
Hg. If a mixture solution of ‘A’ and ‘B’ boils at 80 C and 1 atm pressure, the amount of ‘A’ in the mixture is (1 atm = 760 mm Hg)

Anonymous User Chemistry 18 Nov, 2020 1 Answer 56 views

A man saves Rs. 200 in each of the first three months of his service. In each of the subsequent months his saving increases by Rs. 40 more than the saving of immediately previous month. His total saving from
the start of service will be Rs. 11040 after?

Anonymous User Maths 12 Nov, 2020 1 Answer 67 views


A car is fitted with a convex side-view mirror of focal length 20cm. A second car 2.8 m behind the first car is overtaking the first car at relative speed of 15 m/s. The speed of the image of the second car as seen in the mirror of the first one is?

Anonymous User Physics Ray Optics 11 Nov, 2020 1 Answer 55 views

For a student to qualify, he must pass at least two out of three exams. The probability that he will pass the 1st exam is p. If he fails in one of the exams, then the probability of his passing in the next exam is p/2, otherwise it remains the same. Find the probability that he will qualify?

Anonymous User Maths Probability 01 Nov, 2020 1 Answer 62 views

A wave travelling along the x-axis is described by the equation y(x, t) = 0.005 cos (αx −βt). If the wavelength and the time period of the wave are 0.08 m and 2.0 s, respectively, then α and β in appropriate units are

Anonymous User Physics 28 Oct, 2020 1 Answer 58 views

Two coaxial solenoids are made by winding thin insulated wire over a pipe of cross sectional area A = 10 cm2 and length = 20 cm. If one of the solenoids has 300 turns and the other 400 turns, their
mutual inductance is (μ0 = 4π × 10-7 Tm A-1)

Anonymous User Physics 28 Oct, 2020 1 Answer 55 views

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Mason Robert General Knowledge 23 Oct, 2020 0 Answer 56 views

A planet in a distant solar system is 10 times more massive than the earth and its radius is 10 times smaller. Given that the escape velocity from the earth is 11 kms−1, the escape velocity from the surface of the planet would be

Anonymous User Physics 21 Oct, 2020 1 Answer 54 views