reading activities for middle school

Take a nichrome wire of about 50 cm length and apply a potential difference of 1.5 V from a battery. Measure the current flowing through the wire using an ammeter connected to it in series, and note the potential difference across the resistance using a voltmeter connected across it. Note down and ..

Complete the following table by measuring the interior and exterior angles of the figure given above using a protractor. Study the table carefully and identify the relation between exterior and interior opposite angle..

Sodium chloride is taken in a round bottomed flask, and concentrated sulphuric acid is added to the flask through the thistle funnel. Then the flask is heated. The hydrogen chloride gas formed is collected by the upward displacement of air. To obtain dry hydrogen chloride gas, it is passed through..

Set the apparatus as shown in figure 6.8. The platinum coil is heated at 800 o C in a combustion tube till it becomes white hot. Then ammonia and oxygen are passed through the tube. Under these conditions and in the presence of the catalyst, ammonia combines with free oxygen or oxygen of the a..

Draw a scalene triangle, an acute angled triangle, an obtuse angled triangle, an equilateral triangle and a right angled triangle. Measure the angles in all the figure. Enter the measure in the table given. What do you observe? What do you conclude with respect to the sum of the magnitudes of all ..

Take a thin layer of tissue from the lower surface of the leaf. Mount it on a slide in water and examine under a microscope. You will find tiny pores or stomata along with the epidermal cells. The stomata are bound by a pair of guard cells whose concave sides face each other. It is through the stom..

Set the apparatus as shown in figure 6.7. Firstly, when ammonia is passed through the longer tube and is made to ignite, it does not catch fire. Then oxygen is sent through the shorter tube. Now when ammonia is ignited, it catches fire and the following reaction takes place: Although the pro..

Draw a triangle ABC. Mark the mid-points of BC, AC and AB as D, E and F respectively. Join AD, BE, CF. AD, BE and CF are the three medians of D ABC. They pass through (or meet) at the same point (or common point). G is the point of concurrence of the medians. It is called as centroi..

In a transparent combustion tube, cotton wool dipped in concentrated hydrochloric acid and liquor ammonia is introduced separately from the two ends of the tube. Both the ends of the combustion tube are then closed with rubber stoppers (Fig.5.6)...

Take two glass jars A and B. Collect sulphur dioxide gas in jar B and let jar A contain air. Carefully invert jar B containing sulphur dioxide, over the jar A containing air. Keep it for a few minutes (Fig. 7.3). Remove jar B and put a filter paper strip dipped in acidified potassium dichromat..