question_answer14) Zinc granules were added to zinc sulphate, copper sulphate, aluminium sulphate and iron sulphate solution as shown below. Find the two beakers in which you would observe the deposition of metalon zinc?View Answer play_arrow
question_answer15) Four students. were asked by theirteacher to arrange the set ups I-IV asgiven below and identify the gasevolved in each case, if any. After observations, they arrived at the following inferences and recorded these in the form of a table given below.
|A||Hydrogen||No gas||Carbon dioxide||Hydrogen|
|B||Carbon dioxide||Hydrogen||No gas||Carbon dioxide|
|C||Carbon dioxide||Hydrogen||Hydrogen||No gas|
|D||No gas||Carbon dioxide||Carbon dioxide||Hydrogen|
question_answer16) Write the technical terms for following events. (a) The movement of plant in thedirection of light. (b) The movement of plant parts inresponse to water. (c) The movement of plant parts towards chemical substance. (d) The downward movement of roots in response to gravitational force.View Answer play_arrow
question_answer31) What happens to food inside small intestine? How do intestinal walls facilitate food absorption? Or Shanu told his father that plant exude out alot of water in vapour form from leaves, define it. What is its importance? How do stomata help in this process?View Answer play_arrow
question_answer32) Find equivalent resistance and total currentin the following. Or (a) For the circuit shown in the given figure, What is the value of (i) current through resistor? (ii) potential difference across resistor? (b) In an electrical circuit, three incandescent bulbs A, B and C of rating 40 W 60 W and 100 W respectively are connected inparallel to an electric source. Write the order of brightness.View Answer play_arrow
question_answer33) The electric bell of Mr. Sharma's house is not working. He asks his son to get it changed.His son first checks for the fault. The gong is found displaced, he repairs it to work again. (a) Sketch the values of Mr. Sharma. (b) Which values of his son are appreciable? (c) On which principle is electric bellbased? Explain that principle andgive one more practical applicationof it. Or Sakshi's bus arrives at 7:40 am. Shereaches the stop at 7:35 am and waits. Sohan does not reach at even 7:45 am Sakshi goes up to driver and asks himto close the engine, who ignores it. (a) Appreciate the values of Sakshi. (b) What values must be illustrated in Sohan and driver? (c) Why does Sakshi ask the driver toclose the engine? (d) Burning of fuel is chemical change orphysical change. (e) The fuel used in the bus is renewableor non-renewable.View Answer play_arrow
question_answer34) (a) For making cake, baking powder istaken. If at home your mother uses baking soda instead of baking powder in cake. (i) How will it affect the taste of the cake and why? (ii) How can baking soda be converted into baking powder? (iii) What is the role of tartaric acid added to baking soda? (b) Name the acid present in ant sting and give its chemical formula. Also give the common method to get relief from the discomfort caused by the ant sting. Or (a) A metal carbonate X on reacting with an acid gives a gas which when passed through a solution Y gives the carbonate back. On the other hand, a gas G that is obtained at anode during electrolysis of brine is passed on dry Y, it gives a compound Z, used for disinfecting drinking water. Identify X, Y, G and Z. (b) What happens when nitric acid is added to egg shell?View Answer play_arrow
question_answer36) Draw a labelled diagram of an electric motor. Explain its principle and working. What is the function of split ring in an electric motor? Or Explain the underlying principle and working of an electric generator by drawing a labelled diagram. What is the function of brushes?View Answer play_arrow
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