[," precipitate,they cannot check hardness "],[" Q."25.," Explain the cleansing action of soaps."],[" Ans.For answer,consult Unit "5" (volume "1" ) "]

What is the difference between the molecules of soaps and detergents, chemically ? Explain the cleansing action of soaps. or How many groups and periods are there in the modern periodic table ? How do the atomic size and metallic character of elements vary as we move : 1. along the group 2. along the period :

(a) What is a soap ? Name one soap. (b) Describe the structure of a soap molecule with the help of a diagram. (c ) Explain the cleansing action action of soap . Draw diagrams to illustrate your answer.

A rod of length 2 units whose one end is (1,0,-1) and other end touches the plane x-2y=2Z+4=0, then a. the rod sweeps the figure whose volume is b .pic . d. cubic units. e. the area of the region which the rod traces on the plane is f . g.2pih . i. j. the length of projection of the rod on the plane is k . l.sqrt(m .3n .)o.p . q. units. r. the centre of the region which the rod traces on the plane is s . t.(u . v. w.2/x .3y . z. , aa.2/b b .3c c . dd. ,-e e .5/f f .3g g . hh. ii.)dotj j . kk.

In the following items, each passage consists of six sentences. The first sentence ( S 1 ) and the final sentence ( S 6 ) are given in the beginning. The middle four sentences in each have been removed and jumbled up. These are labelled P, Q, R and S. You are required to find out the proper sequence of the four sentences and mark accordingly on the. Answer Sheet. S1: People's fear of snakes seems to be based on a series of misconceptions. S6 : Yet people will insist that they cannot touch a snake because of its sliminess P : The most common one is the conviction that all these creatures are poisonous Q : Another very popular idea is that these reptiles are slimy to touch R : Snakes are really dry and cold, not slimy like a wet cake of soap but rather like a crocodile skin handbag to the touch In fact, the non-poisonous ones outnumber the poisonous ones by about ten to one. The proper sequence should be

Salts M, N, O, P and Q undergo reactiom (i) to (v) respectively. Identify the cation present in these salts on the basis of these reaction. Tabulate your answer in the format given below. 1. When sodium hydroxide solution is added to the salt M, and heated strongly a colourless gas with a pungent smell is evolved which turm red litmus paper blue and gives dense white fumes with a moist glass rod with hydrochloric acid. 2. Addition of dilute hydrochloric acid to a solution of N gives a thick white precipitate which is soluble in hot water. 3. When ammonium hydroxide solution is added to the solution of 0 a light blue precipitate is obtained which is soluble in excess of ammonium hydroxide to form an inteme deep blue solution. 4. When ammonium hydroxide solution is added to the solution of P reddish brown (mustard colour) precipitate is obtained which ,is insoluble even in the excess of ammonium hydroxide solution. 5. When sodium hydroxide solution is added to the solution of Q a which coloured gelatinous precipitate is obtained which is soluble in excess of sodium hydroxide to form a clear solution

There is a fixed sphere of radius R having positive charge Q uniformly spread in its volume. A small particle having mass m and negative charge (– q) moves with speed V when it is far away from the sphere. The impact parameter (i.e., distance between the centre of the sphere and line of initial velocity of the particle) is b. As the particle passes by the sphere, its path gets deflected due to electrostatics interaction with the sphere. (a) Assuming that the charge on the particle does not cause any effect on distribution of charge on the sphere, calculate the minimum impact parameter b0 that allows the particle to miss the sphere. Write the value of b_(0) in term of R for the case 1/2mV^(2)=100.((kQq)/(R)) (b) Now assume that the positively charged sphere moves with speed V through a space which is filled with small particles of mass m and charge – q. The small particles are at rest and their number density is n [i.e., number of particles per unit volume of space is n]. The particles hit the sphere and stick to it. Calculate the rate at which the sphere starts losing its positive charge (dQ)/(dt). Express your answer in terms of b_(0)

Directions: In the question given below a statements is followed by three courses of action numbered I or (A), II or (B) and III or (C). A course of action is a step or administrative decision to be taken for improvement, follow-up for further action in regards to the problem, policy etc. on the basis of the information given in the statement. you have to assume everything in the statement to be true, then decide which of the three given/suggested courses of action logically follows for pursuing and decide the answer. Statements: The oil pool sector is showing a burgeoning deficit mainly because of rise in international prices and no corresponding rise in domestic prices. Course of action: I. The government should raise domestic prices immediately. II. Raising domestic prices will fuel inflation, hence the government should ignore the deficit. III. The government should decide over a course of action after consulting various experts. 1) Only I follows 2) Only II follows 3) Either I or II follows 4) II and III follow 5) Only III follows

In the following items, each passage consists of six sentences. The first and sixth sentence are given in the beginning as S_(1) and S_(6) . The middle four sentences in each have been jumbled up. These are labelled P, Q, R ans S. You are requested to find out the proper sequence of the four sentences and mark according on the Answer Sheet. S_(1): Why do birds migrate in spite of the heavy loss of life on the way? S_(6): The migration of birds thus is a fascinating study, indeed. P: But birds also migrate during winter. Q: Primarily they migrate during the summer. R: Also they cannot endure the summer heat. S: And the main reason now is not hunger but availability of the nesting sites. The proper sequence should be