A bulb is kept burning just right above the following solids. Name the shape of the shadows obtained in each case. Attempt to give a rough sketch of the shadow.

Write the balanced chemical equations for the following reactions and identify the type of reaction in each case. (a) Iron (III) oxide reacts with aluminium and gives molten iron and aluminium oxide. (b) Magnesium ribbon is burnt in an atmosphere of nitrogen gas to form solid magnesium nitride. (c) Chlorine gas is passed in an aqueous potassium iodide solution to form potassium chloride solution and solid iodine. (d) Ethanol is burnt in air to form carbon dioxide, water and releases heat.

A highly conducting solid sphere of radius R density rho and specific heat s is kept in an evacuted chamber. A parallel beam of thermal radiation of instensity I is incident on its surfcae Consider the sphere to be a perfectly black body and its temperature at certain instant considered at t =0 is T_(0) [Take Stefan's constant as sigma ] Answer the following questions based on above information The equation which gives the temperature T of the sphere as a function of time is .

Eight persons - H, I, J, K, L, M, N and O-are standing in a straight line at equidistant. Some of them are facing north while others are facing south. M is standing third to the right to H. M is standing at one of the extreme ends. L is standing third to the left to H. The immediate neighbours of J face north. N is not an immediate neighbour of H. The persons standing at the extreme ends face the same direction (Both are facing either north or South). The immediate neighbours of H face just opposite direction as that of M. The immediate neighbours of O face opposite directions with respect to each other. One of the immediate neighbours of L is K who is facing north. I is standing between J and M. Not more than four persons are facing north. Four of the following five are alike in a certain way based on the above arrangement and hence form a group. Which one of the following does not belong to that group ?

A sheet of plywood, a piece of muslin cloth and that of a transparent glass, all of the same size and shape were placed at A one by one in the arrangement shown in Fig. 11.12. Will the shadow be formed in each case. If yes, how will the shadow on the screen be different in each case? Give reasons for your answer.

There are 8 boxes kept in a shelf namely A, B, C,D,E,F ,G and H , not necessarily in the same order. They are coloured in Grey, Pink, Green, Brown, Red, White, Orange and Blue papers, not necessarily in the same order. There is exactly one box between B and H. The blue box is kept just below H, H is not coloured in Green or Brown. G is kept adjacent to B but not adjacent to H. The orange Box is four boxes above the Blue box. A is kept just above C and neither fo them is orange or blue in colour. THere are at least two boxes kept below C. THe box coloured in White is kept just above the Grey Box. F is neither coloured in Blue nor is kept at the top. The Brown Box is not kept at the bottom. E which is coloured in red is kept four boxes below A. Which of the following statements is correct

Study the following information carefully and answer the given questions. Eight boxes i.e. K, L, M, N, O, P, Q and R kept one above the other. All the boxes are arranged from top to bottom in a stack. Each box contains different colour i.e. Blue, Red, Black, Orange, Yellow, White, Green and Purple. All the information is not necessarily in the same order. Three boxes are kept between box L and box R which is kept above box L. Box O does not contain Yellow colour. Two boxes are kept between the box which contains Red colour and M. The number of boxes is kept above the one which contains Red colour is same as the number of boxes is kept below the one which contains Black colour. The box which contains Black colour is not kept adjacent to box K. Three boxes are kept between those which contain Black colour and Purple colour. Box N is kept one of the boxes above the one which contains Orange colour. Box Q is kept just above the box which contains Purple colour. Not more than two boxes are kept above the box which contains Red colour. More than two boxes are kept between box Q and box K. The box which contains Blue colour is kept just above the one which contains Green colour. Three boxes are kept between the box which contains Blue colour and the box O. Two boxes are kept between the box K and the box which contains White colour. More than two boxes are kept between the box N and the box which contains Yellow colour. How many boxes are kept above the one which contains Orange color?

Study the following information carefully and answer the given questions. Eight boxes i.e. K, L, M, N, O, P, Q and R kept one above the other. All the boxes are arranged from top to bottom in a stack. Each box contains different colour i.e. Blue, Red, Black, Orange, Yellow, White, Green and Purple. All the information is not necessarily in the same order. Three boxes are kept between box L and box R which is kept above box L. Box O does not contain Yellow colour. Two boxes are kept between the box which contains Red colour and M. The number of boxes is kept above the one which contains Red colour is same as the number of boxes is kept below the one which contains Black colour. The box which contains Black colour is not kept adjacent to box K. Three boxes are kept between those which contain Black colour and Purple colour. Box N is kept one of the boxes above the one which contains Orange colour. Box Q is kept just above the box which contains Purple colour. Not more than two boxes are kept above the box which contains Red colour. More than two boxes are kept between box Q and box K. The box which contains Blue colour is kept just above the one which contains Green colour. Three boxes are kept between the box which contains Blue colour and the box O. Two boxes are kept between the box K and the box which contains White colour. More than two boxes are kept between the box N and the box which contains Yellow colour. Which amongst the following box contains Purple colour?