4 Top 9Th Standard English Lesson Plan 2017 Galleries - To look at the characteristic of spirogyra/agaricus, moss, fern, pinus (both with male or girl cone) and an angiospermic plant - technology practicals intention to study the feature of spirogyra/agaricus, moss, fern, pinus (both with male or female cone) and an angiospermic plant. Draw and give identifying functions of companies they belong to. Theory the mass of unit extent of a substance is called its density. Density = mass of the substance/extent of substance if d is density of a body of mass m and volume v, then d = m/v in s.I. Units density is expressed in kg/m3. As an instance, density of water is 1000 kg//m3 to decide the density of an item, we have to degree amount mass and quantity. Materials required a spring balance of suitable range, a stable frame (a piece of stone), thread, water and graduated cylinder of suitable range. Technique a. For determining mass 'al' of the solid body by way of the use of a spring balance. Step 1: a spring stability is taken of appropriate variety. Step 2: the range of divisions among two long commencement marks is observed on the size of the spring stability and find its least matter. Step three: a thread is tied to the given strong body (a piece of stone) and suspended from the hook on the lower give up of the spring stability. The studying of the pointer on the size of the spring balance is stated. Allow it's 'w'. For this reason 'w' is the burden of the given solid body in g wt. Mass of the strong frame is w grams. As a consequence, m = w×10-three kg. Step 4: the observations is repeated more times. B. For determining the volume of the given strong frame by way of measuring cylinder step 1: a graduated cylinder of appropriate range is taken and its least matter noted down. Step 2: some water is poured into the cylinder and the initial level of water in the cylinder is notice. The reading at the lower meniscus of water (p) is taken on the graduated cylinder. Permit it be v1. Step three: now, the stable is absolutely immersed in water without touching the facet partitions of the cylinder. The level of water rises. The studying at lower meniscus of water stage (q) on the graduated cylinder is mentioned. Allow or not it's v2. Step four: the observations are repeated for 2 more instances. Precautions 1. The measuring cylinder must be dry and easy. 2. The dimensions of the spring stability have to be adjusted to examine 0 to start with. Three. Take the reading simplest when the frame involves rest. Four. Only the lower meniscus of the water degree should be study. Five. The frame have to completely immerse within the water, the strong frame need to now not contact the perimeters or base of the cylinder. 6. The strong piece must be wiped with a dry material before repeating the interest.? visit list of experiments.