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Leclanche cell of an outer glass vessel which is filled with saturated ammonium chloride (NH 4 Cl) solution. In it there stands a zinc rod and porous pot 'P' containing a carbon rod 'c' which is packed round with a mixture of manganese dioxide (MnO 2 ) and powdered carbon. Wet Leclan..

To construct angles of 90 o , 45 o and 135 o (i) Draw a line AB and mark any point O on it. (ii) With O as centre, draw an arc of any suitable radius which cuts AB at P. (iii) With P as centre and the same radius, cut this arc at Q. (iv) From Q, with the same radius, cut the arc again at ..

Construction - 12 - To construct when , AC = 4 cm, BC = 4.8 cm, two sides and the angle opposite to one of them are given. (1) Draw a straight line AX (2) At A, Construct (3) From A, cut off AC = 4 cm. (4) From C, cut off CB = ..

Construction - 14 - To construct a right angled D ABC when hypotenuse AC = 4 cm and hypotenuse and one acute angle are given (1) Draw a straight line AC = 4cm. (2) Taking OC as diameter, draw a semi circle on AC. (3) At A, construct meeting the semi..

Water flowing in high altitude rivers is stored in a man-made reservoir as shown in the figure. The kinetic energy of the flowing water is transformed into potential energy as the water level rises. This water is carried through pipes to the turbine situated at the bottom of the dam. The water ..

To construct an isosceles when altitude CD to the base AB is 2 cm and the vertical angle C = 90 o (1) Take any straight line XY and at any point D on it, draw cutting off DC = 2 cm. Join DC. (2) At C, on either side of DC, construct angles DCA and DCB, respectively, each being e..

). At Y, make an angle of 30 o ( ). Produce their arms to meet at A. (3) Draw perpendicular bisectors of AX and AY to meet XY at B and C. (4) Join AB and AC. Then is the required triangl..

Constructions are to be drawn by using ruler and compass only. It must be stressed that not all constructions are possible using a compass and straight edge alon..

'S' is a large spherical conducting shell of radius few meters. C 1 and C 2 are the two supporting pillars. An insulating material like silk acts like a conveyor belt wound over two pulleys P 1 and P 2 . The pulleys move with the help of a motor. B 1 and B 2 are two spray combs. D i..

Solar Furnace This type can be used for cooking. But the time of cooking depends on the intensity of the sunlight and hence the time taken is shorter in the summer and longer in the winter. Rice, pulses and vegetables can be boiled by keeping them inside the box. Baking and frying can be done in re..