A student uses a spring balance of least count 10 g wt and range 500 g wt. He records the weight of a small iron cube in air, in tap water and in a cancentrated solution of common salt in water, If his three reading taken in this order are `W_1(=50gwt`), `W_2` and `W_3` he is likely to observe that:

A student is given an iron cube of side 1cm, a measuring cylinder of range 100 mL and least count 1 mL, and a spring balance of range 100g wt and least count 1g wt. He can use these to measure:

(Take C_(w)=4180 J kg^(-1) K^(-1)) A block of weight 5kg falls from a height of 5m into a bucket containing 10L of water. If all the mechanical energy of the block is used to heat water, find the rise in temperature of water. Take g= 10ms^(-2)

Inspired by Alfred Werner (1866-1919), a KOTA student decided to reconduct a similar experiment on unknown salt samples of MCl_(3).xNH_(3) . The student found that some of the chloride ions could be prdipitated as AgCl on adding silver nitrate solution. He found that this salt was of 4 years (based on colour). He labelled these complexes as A (yellow complex) B( purple complex), C (Green complex), D (violet complex). He found that moles of AgCl precipitated (per mole of salt) in one case was 3, one case it was 2, and in two cases it was one. He then measured the electrical conductivity of various salt solutions and found that D had the lowest value. He then measured the boiling point of solutions of A, B, C, D and found that B had the 2nd highest boiling point, Based on the above information, answer the following questions. The student took 2.675 g sample of A (Atomic weight of central atom=59) and dissolved it in water to form 1 L solution whose molar conductance was found to be 200" "Omega^(-1)cm^(2)mol^(-1) What is the specific conductance of the solution ?

A student heats some amount of tap water in a calorimeter to a temperature of nearly 50^(@)C above the room temperature. He then records the temperature of this water as it is cooling down at regular intervals of 2 minutes each. He tabulates his observations as follows: {:("Time"("in minutes")rarr,0,2,4,6,8,10),("Temperature"("in".^(@)C)rarr,t_(1),t_(2),t_(3),t_(4),t_(5),t_(6)):} He is likely to observe that:

Three students S_1, S_2 and S_3 perform an experiment for determining the acceleration due to gravity (g) using a simple pendulum. They use different lengths of pendulum and record time for different number of oscillations. The observations are as shown in the table. (Least count of length = 0.1 m least count for time = 0.1 s) If E_1, E_2 and E_3 are the percentage errors in 'g' for students 1, 2 and 3 respectively, then the minimum percentage error is obtained by student no._____.