Name the scale on which the destructive energy of an earthquake is measured . An earthquake measures ^3 on this scale. Would it be recorded by a seismograph ? Is it likely to cause much damage ?

Two full turns of the circular scale of a screw gauge cover a distance of 1 mm on its main scale. The total number of divisions on the circular scale is 50. Further it is found that the screw gauge has a zero error of -0.03 mm. While measuring the diameter of a thin wire, a student notes the main scale reading of 3 mm and the number of circular scale division in line with the main scale as 35. The diameter of the wire is

Parveen wated to make a temporary shelter for her car, by making a box - like structurer with tarpaulin that covers all the four sides and the top of the car (with the front face as a flap which can be rolled up). Assuming that the stiching margins are very small, and therefore neglible, how much tarpaulin would be required to make the shelter of height 2.5 m, with base dimensoins 4mxx3m?

A galvanometer of resistance 200 ohm gives a full scale deflection for a current of 10^-3 ampere. To convert it into an ammeter capable of measuring upto one ampere, the resistance which should be connected in parallel with it is

For an experiment in botany,two different plants,plant A and plant B were grown under similar laboratory conditions.Their heights were measured at the end of each week for 3 weeks.The results are shown by the following graph.(a)How high was plant A after (i) 2 Weeks (ii)3 Weeks? (b)How high was plant B after (i) 2Weeks (ii)3 weeks? (c) How much did plant A grow during the 3rd week? (d)How much did plant B grow from the end of the 2nd week to the end of the 3rd week? (e) During which week did plant A grow most? (f)During which week did plant B grow least? (g)Were the two plants of the same height during any week shown here?Specify.