Recent questions tagged sec-d

On world population day, Rohit and his friends arranged an awareness campaign programme in their locality. Some elderly people rebuked the children and asked them not to talk on such things in public. The children convinced the elders about the need of the programme and on the understanding their point of view, they also joined the campaign a.) What values did elderly people and Rohit show on the occasion? b)Why is such an awareness programme necessary? c)What role the government has played in controlling population explosion?

asked Dec 19, 2016 by meena.p

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A teenage girl accidently became pregnant . she stopped coming to college and also preferred to remain insolated. She was scared to inform her parents. One of her friends Shwetha, met her and came to know about her problem. She took her to a doctor and got her aborted. She convinced her parents and kept the matter concealed. a. Did Shwetha take correct decision? What values did she show? b. What is the medical term for abortion? What is the period considered safe for abortion? c. What prevention may be taken to avoid pregnancy?

asked Dec 8, 2016 by meena.p

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During a visit to Kedarnath, Mohan came across a young couple staying in the adjacent room in the hotel. He learnt that the couple had been visiting different temples and performing rituals to get a child. Mohan was astonished and explained to them about ART which he had learnt in the biology class recently. The couple were happy and understood the wrong approach and thanked Mohan. a.Identify the values shown by Mohan. b)What is ART? What are the various methods of ART? c)What are the limitations for which ART is not commonly accepted?

asked Dec 7, 2016 by meena.p

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Ratan lives in a remote village. Suddenly, he comes to know that his father has arranged the marriage of younger sister who is barely 14 years old, to a well-to-do middle aged man living in a nearby village. Ratan objected to his father’s act. Ratan was not convinced by his father’s saying that a better groom might not be available later. Ratan complained to the village head and got the problems solved.a. Did Ratan act properly by approaching the village head? Why or why not?b. What biological considerations made Ratan object to his father’s decision? c. What values and responsibilities did Ratan show?

asked Dec 5, 2016 by meena.p

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Joy loves to play football and was selected as a captain of the school team for the district level tournament. He also does social work . He attended blood donation camp to donate blood and he came to know that he was HIV positive. He lost interest in games and refused to play or study. He started counting his days. He remained absent from the school for a long time. The Biology teacher visited his house and counseled him. Joy was back to school and played the tournament also.a.What sense of responsibility did the teacher exhibit?b.A person detected to be HIV positive should be isolated in the society. Do you agree? Why or why not?c.How is AIDS not spread?

asked Dec 2, 2016 by meena.p

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The chemistry of the actinoid elements is not so smooth as that of the Lanthanoids. Justify this statement by giving some examples from the oxidation state of these elements.

asked Nov 29, 2016 by meena.p

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Drugs containing carboxylic Acid organic acids characterized by the presence of at least one carboxylic group. The general formula of a carboxylic acid is $R-COOH$. The carboxylic acids find a use in the manufacture of many useful drugs.one Such important drug is aspirin Answer the following (i) What is the IUPAC name of the drugs ? Name the functional groups present in the drug . (ii) Can the drug be prepared in the lab ? (iii) A person goes to the shop keeper to get aspirin pills without doctors presoription . The chemist is reluctant to give him pills with out doctor's prescription . (iv) Which values are reflected in chemists approach ?

asked Nov 28, 2016 by meena.p

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Rahul observed that families from nearby localities bring loads of laundry to wash in the river practically every day, while others bring their cars, taxis and rickshaws and wash them clean by using water from the river. The same water was being consumed by people living downstream.When he tried to stop people from washing clothes and cleaning vehicles.Nisar Khadim a local resident objected. “It makes no difference if we wash our cars and clotheshere. It is a gift from nature,” he said ,Answer the following question a)Who do you think is right Rahul or the taxi driver?Give a reason for your answer. b) What are the values associated with the answer?

asked Nov 28, 2016 by meena.p

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A survey revealed that most of the industries in Najafgarh area have not installed smoke precipitators in the chimneys. a) What is the use of smoke precipitators? b) Why do you feel that it should be mandatory for industries to install smoke precipitators?

asked Nov 28, 2016 by meena.p

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famous sweet in hyderabad , Rishi bought some sweets . He requested the sales boy to put the sweets in a polythene bag.The sales boy refused to do so, instead he kept the sweet box in a paper bag. After reading the above passage answer the following questions. (i) Why did the sales boy refuse to put the sweet box in a polythene bag? (ii) As a student of chemistry, why would you advocate the use of paper bags instead of polythene bags?Which values are promoted through the use of paper bag? (iii) Suggest two activities to promote these values.

asked Nov 28, 2016 by meena.p

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Ethyl alcohol to which another liquid has been added to make it unfit for use as beverage is called denatured alcohol. Ethyl alcohol denatured by adding methyl alcohol, is highly poisonous. Answer the following questions: (i) Mention another way by which alcohol is denatured. (ii) Explain why methanol is highly toxic to human beings? (iii) How is methanol prepared on large-scale? Give its two important uses.

asked Nov 28, 2016 by meena.p

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Purification of drinking water is a big problem. In your locality, vendors of various companies are promoting RO units for purification of water for domestic use irrespective of whether it is required or not. Answer the following questions: (i) What is the meaning of RO? (ii) Would you recomend the installation of RO units in all the areas? (iii) Support your views with reasons.

asked Nov 28, 2016 by meena.p

1 answer

Earth receives enormous amount of energy from sunlight. The problem of shortage of power can be solved if we could convert solar energy into electricity. A device which generates electrical power from sunlight is called solar cell or photovoltaic cell. Solar cells are made up of silicon doped with arsenic and silicon doped with boron. Answer the following questions: (i) When silicon is doped with arsenic, what type of semiconductor is obtained? Explain. (ii) What type of semiconductor is obtained by doping silicon with boron? (iii) Give any two applications (other than solar cells) of semiconductors.

asked Nov 28, 2016 by meena.p

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A boy baths in the first shower of rainfall during rainy season and his body gets yellowish brown colour patches on the whole body for which he was medicated. Answer the following questions: (i) Why the skin of the boy got yellowish brown patches. (ii) As a student of chemistry what do you think could be reason and the term you would use to explain it? (iii) Which values are promoted through this activity? (iv) Suggest two activities to promote these values.

asked Nov 28, 2016 by meena.p

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On visit to your native village, you find that lot of smoke, dust and some other gases are coming out of the chimney of a recently set up factory near the village which is the cause of many respiratory problems for the people living there. Answer the following questions (i) As a chemistry student, what method you will suggest the factory owner to manage dust and smoke? (ii) What is the basic principle involved in your suggestion? (iii) What values are associated with your advice?

asked Nov 22, 2016 by meena.p

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During a thunderstorm the 'live' wire of the transmission line fell down on the ground from the poles in the street. A group of boys, who passed through,noticed it and some of them wanted to place the wire by the side. As they were approaching the wire and trying to lift the cable, Anuj noticed it and immediately pushed them away, thus preventing them from touching the live wire. During pushing some of them got hurt. Anuj took them to a doctor to get them medical aid. Based on the above paragraph, answer the following questions : (a) Write the two values which Anuj displayed during the incident. (b) Why is it that a bird can sit on a suspended 'live' wire without any harm whereas touching it on the ground can give a fatal shock ? (c) The electric power from a power plant is set up to a very high voltage before transmitting it to distant consumers. Explain, why.

asked Jun 9, 2016 by meena.p

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Find the value of k for which the points $A(k+1,2k) ,B(3k,2k+3) $ and $ c(5k-1,5k)$ are collinear .

asked Mar 18, 2015 by meena.p

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A truck covers a distance of $150 km$ at a certain average speed and then covers another 200 km at an average speed which is $20\;km/hr$ more than the first speed. If the truck covers the total distance in 5 hours, find the first speed of the truck?

asked Mar 18, 2015 by meena.p

1 answer

From each end of solid metal was scooped out in hemispherical form of same diameter . The height of the cylinder is 10 cm and its base is of radius $4.2 \;cm$ . The rest of the cylinder is melted and covered into a cylindrical wire of $1.4\;cm$ thickness . Find the length of the wire $(\pi=\large\frac{22}{7})$

asked Mar 17, 2015 by meena.p

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In the Figure $PQRS$ is a square laws with side $PQ= 42 meters$. Two circular flower beds are there on the sides $PS$ and $QR$ with center at $Q,$ the intersection of its diagonals. Find the total area of the two flower bed (shaded parts)

asked Mar 17, 2015 by meena.p

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Find the value of k so that the area of the triangle with verices $(1,-1) , (-4,2k)$ and $(-k,-5)$ is 24 sq.units

asked Mar 17, 2015 by meena.p

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A card is drawn at random from a well -shuffled deck of playing cards . Find the probability that the card drawn is (i) A card of spade or an ace (ii) a black king (iii) neither a jack nor a king (iv) either a king or a queen

asked Mar 17, 2015 by meena.p

1 answer

At a Point A, 20 metres above the level of water in a lake , the angle of elevation of a cloud is $30^{\circ}$ . The angle of depression of the reflection of the cloud in the lake, at A ia $60^{\circ}$ . Find the distance of the cloud from A.

asked Mar 17, 2015 by meena.p

1 answer

Construct a $\Delta ABC$ in which $AB= 6\;cm, \angle A=30^{\circ}$ and $ \angle B=60^{\circ}$ construct another $ \Delta AB'C'$ similar to $\Delta ABC$ with base $AB'= 8 \;cm$

asked Mar 17, 2015 by meena.p

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Prove that the tangent drawn at the mid point of an arc of a circle is parallel to the chord joining the end points of the arc.

asked Mar 17, 2015 by meena.p

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Prove that the length of the tangents drawn from an external point to a circle are equal

asked Mar 17, 2015 by meena.p

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A train travels at a certain average speed for a distance of 54 km and then travels a distance of $63\;km$ at an average speed of $6\;km/h$ more than the first speed. If it takes 3 hours to complete the total journey, what is its first speed?

asked Mar 17, 2015 by meena.p

1 answer

Find the 60th term of the AP $8,10,12....,$ if it has a total of 60 terms and hence find the sum of its last 10 terms .

asked Mar 17, 2015 by meena.p

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The diagonal of a rectangular field is 16 meters more than the shorter side. If the longer side is 14 meters more than the shorter side, then find the lengths of the sies of the field.

asked Mar 17, 2015 by meena.p

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The diagonal of a rectangular field is 16 meters more than the shorter side. If the longer side is 14 meters more than the shorter side, then find the lengths of the sies of the field.

asked Mar 17, 2015 by meena.p

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If $A(-2,-1), B(a,0), C(4,b)$ and $D(91,2)$ are the vertices of a parallelogram, find the values of a and b.

asked Feb 19, 2015 by meena.p

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Find the coordinates of the circumcentre of the triangle whose vertices are $(8,6),(8.2)$ and $(2,-2)$. Also find its circum-radius

asked Feb 19, 2015 by meena.p

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$ABC$ is a right angled triangle , right angled at A. Find the area of the shaded region if $AB = 6cm, BC = 10cm$ and $I$ is the centre of the incircle of $\Delta ABC.$

asked Feb 19, 2015 by meena.p

1 answer

Sonia buys a shop for $Rs. 1,20,000$. She pays half the amount in cash and agrees to pay the balance in $12$ annual installments of $Rs. 5000$ each. If the rate of interest is $12 \%$ and she pays with the installment due on the unpaid amount, find the total cost of the shop.

asked Feb 19, 2015 by meena.p

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Ramesh has got $24000/$ - as Puja Bonus. He donated ` 5000/'- to temple. He gave $`12000/-$ to his wife, ` $2000/-$ to his servant and gave rest of the amount to his daughter. a. What is the probability of wife's share? b. Calculate the probability of servant's share? c. What is the probability of daughter's share? d. Which value are depicted by Ramesh from the way the amount is distributed?

asked Feb 19, 2015 by meena.p

1 answer

A fast train takes 3 hrs less than the a slow train for a journey of $600\;km$. If the speed of the slow train is 10km/hr less than that of the fast train, find the speeds of the two trains

asked Feb 19, 2015 by meena.p

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If two tangents are drawn to a circle from an external point, then prove that, a)They subtend equal angles at the centre b) They are equally inclined to the segment, joining the centre to that point.

asked Feb 19, 2015 by meena.p

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Two circles with centres A and B of radii $3\;cm$ and $4\;cm$ respectively intersect at two points C and D such that AC and BC are tangents to the two circles. Find the length of the common chord

asked Feb 19, 2015 by meena.p

1 answer

An aeroplane flying horizontally $1\;km$ above the ground is observed at an angle of elevation of $60^{\circ}$. After 10 seconds, its elevation is observed to be $30^{\circ}$. Find the speed of the aeroplane in km/hr

asked Feb 19, 2015 by meena.p

1 answer

If the angle of elevation of a cloud from a point h meteres above a lake is a and the angle of depression of its reflection in the lake be b, prove that the distance of the cloud from the point of observation is $\large\frac{2hsec \alpha}{tan \beta -tan \alpha}.$

asked Feb 19, 2015 by meena.p

1 answer

A hollow cone is cut by a plane parallel to the base and the upper portion is removed. If the curved surface of the remainer is $\large\frac{8}{9}$ of the curved surface of the whole cone, find the ratio of the line-segment into which the cone’s altitude is divided by the plane.

asked Feb 19, 2015 by meena.p

1 answer

Water flows at the rate of $10\;m$ per minute through a cylindrical pipe having its diameter as $5\;mm$. How much time will it take to fill a conical vessel whose diameter of base is $40\;cm$ and depth $24\;cm$?

asked Feb 19, 2015 by meena.p

1 answer