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Which of the following time measuring devices is most precise? A digital

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Which of the following time measuring devices is most precise? An atomic clock. Give reason for your

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The distance of a galaxy is of the order of 1025 m. Calculate the order of magnitude of time taken by light to reach us from the

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The vernier scale of a travelling microscope has 50 divisions which coincide with 49 main scale divisions. If each main scale division is 0.5 mm, calculate the minimum inaccuracy in the measurement of

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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During a total solar eclipse the moon almost entirely covers the sphere of the sun. Write the relation between the distances and sizes of the sun and

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If the unit of force is 100 N, unit of length is 10 m and unit of time is 100 s, what is the unit of mass in this system of

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Give an example of a physical quantity which has a unit but no

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Give an example of a physical quantity which has neither unit nor

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Give an example of a constant which has a

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Give an example of a constant which has no

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Calculate the length of the arc of a circle of radius 31.0 cm which subtends an angle of `π/6` at the

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Calculate the solid angle subtended by the periphery of an area of 1 cm 2 at a point situated symmetrically at a distance of 5 cm from the

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The displacement of a progressive wave is represented by `y = A sin(wt – k x )`, where x is distance and t is time. Write the dimensional formula of

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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The displacement of a progressive wave is represented by `y = A sin(wt – k x )`, where x is distance and t is time. Write the dimensional formula of

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Time for 20 oscillations of a pendulum is measured as t 1= 39.6 s; t 2= 39.9 s; t 3 = 39.5 s. What is the precision in the measurements? What is the accuracy of the

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A new system of units is proposed in which unit of mass is α kg, unit of length β m and unit of time γ s. How much will 5 J measure in this new

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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The volume of a liquid flowing out per second of a pipe of length l and radius r is written by a student as `U=(pi Pr^4)/(8ηl)`where P is the pressure difference between the two ends of the pipe and η is coefficient of viscosity of the liquid having dimensional formula ML–1 T–1. Check whether the equation is dimension ally

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A physical quantity X is related to four measurable quantities a, b, c and d as follows:`X = a ^2 b ^3 c ^(5/2) d^(–2)`. The percentage error in the measurement of a, b, c and d are 1%, 2%, 3% and 4%, respectively. What is the percentage error in quantity X ? If the value of X calculated on the basis of the above relation is 2.763, to what value should you round off the

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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In the expression `P = E l^2 m(–5) G(–2), E, m, l` and G denote energy, mass, angular momentum and gravitational constant, respectively. Show that P is a dimensionless

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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If velocity of light c, Planck’s constant h and gravitational contant G are taken as fundamental quantities then express mass, length and time in terms of dimensions of these

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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