A boy makes a ruler with graduations in cm on it (i.e., 100 divisions in 1 m). To what accuracy this ruler can measure ? How can this accuracy be increased ?

A boy measures the length of a pencil and expresses it to be 2.6 cm. What is the accuracy of his measurement ? Can he write it as 2.60 cm ?

In a simple pendulum experiment, length is measured as 31.4 cm with an accuracy of Imm. The time for 100 oscillations of pendulum is 112.0s with an accuracy of 0.1s. The percentage accuracy in g is

Which of the following is the most precise device for measuring length (i) a vernier calipers with 20 divisions on the sliding scale (ii) a screw gauge of pitch Imm and 100 divisions on the circular scale (iii) an optical instrument that can measure length to within a wavelength of light?

The dimensions of the floor of a rectangular room are 3m 60cm xx 5m 40cm . It has to be covered with square tiles. What is the dimension of the largest square tile that can be fitted ? How many such tiles are required to cover the floor?

The period of oscillation of a simple pendulum is given by T = 2pisqrt((L)/(g)) , where L is the length of the pendulum and g is the acceleration due to gravity. The length is measured using a meter scale which has 500 divisions. If the measured value L is 50 cm, the accuracy in the determination of g is 1.1% and the time taken for 100 oscillations is 100 seconds, what should be the possible error in measurement of the clock in one minute (in milliseconds) ?

The resistivity of the material of a wire of length 1 and diameter d and resistance R is given by rho=(piRd^(2))/(4l) . The length of the wire I=100.0 cm is measured using a metre scale with a least count of I mm, the diameter d=0.22 cm is measured using an instrument with a least count of 0.01 cm and resistnce R=5.00 ohm is measured with an accuracy of 0.01 ohm. What is the percentage error? Suggest a method to reduced the percentage error.

A uniform metre rule of mass 100g is balanced on a fulcrum at mark 40cm by suspending an unknown mass m at the mark 20cm. (i) Find the value of m. (ii) To which side the rule will tilt if the mass m is moved to the mark 10cm? (iii) What is the resultant moment now? (iv) How can it be balanced by another mass of 50 g?

One side of a square is measured as 16.7 cm to an accuracy of 0.1 cm. What is the percentage error in area?

The length of a simple pendulum is about 100 cm known to have an accuracy of 1mm. Its period of oscillation is 2 s determined by measuring the time for 100 oscillations using a clock of 0.1s resolution. What is the accuracy in the determined value of g?

The correctness of velocity of an electron moving with velocity 50 ms^(-1) is 0.005% . The accuracy with which its position can be measured will be