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Chaper-4. CARBON AND ITS COMPOUNDS Q-1. Mrs. Anita observed that her cooking utensils are becoming black in colour and the flame of her gas stove is yellowish in colour what can be the reason for this sooty flame. How is this problem harmful for our environment? What steps should be taken to stop this process. Ans: a).The inlets for air in stove get blocked which leads to yellow flame. b). This problem is harmful for our environment as incomplete combustion results in the formation of oxides which are major pollutants of our environment. c). For preventing this situation gas or stove burners should be cleaned time to time. Associated Value : Eco-friendly habits will be inculcated among the learners Q-2. Ethanol is used on a large scale at commercial level this is a very useful chemical. It is commonly called alcohol and is the active ingredient of alcoholic drink. But consumption of alcohol also causes drunkenness and this practice is Socially condemned. As a responsible student of class –X what steps you would take to discourage the use of alcohol. Ans: By sensitizing the people about the harmful effects of liquor consumption. By making poster, banners and writing articles on this issue. By not getting attracted towards this habit and to stop my friends also to keep control on themselves to condemn alchololism. Associated Value : The learners understand the bad effects of Alcoholism and also start try to discourage this practice in the society. Q-3. You must have seen advertisements stating that some vegetable oils are healthy. Saturated fatty acids which are said to be harmful for health. Why vegetable oils are considered healthy then aturated fatty acids (ghee)? What precautions you would take in selecting a cooking oil. Ans: Vegetable oils contain unsaturated fatty acids which are healthy and decrease the cholesterol level in our blood. That is why we should use vegetable oils for cooking. Cooking oil should be selected in such a manner that it should contain low cholesterol. Associated Value : The learners will be able to adopt healthy food habits once they understand that animal fats produce more cholesterol than vegetable oil. ![]()
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APPLICATION OF TRIGONOMETRY(Height and Distance) 10th maths test paper with answer View/Download
APPLICATION OF TRIGONOMETRY: Assignment SA-2 Class X Topic : Height And Distance View/Download For more visit link :{ Height and Distance } 1. The angle of elevation of the top of a tower, from a point on the ground and at a distance of 150 m from its foot, is 30°. Find the height of the tower correct to one decimal place. 2. From a point P on the level ground, the angle of elevation of the top of a tower is 30°. If the tower is 100 m high, how far is P from the foot of tower? 3. A kite is flying at a height of 75 meters from the level ground, attached to a string inclined at 60° to the horizontal. Find the length of the string to the nearest meter. 4. If the length of a shadow cast by a pole be √3 times the length of the pole, find the angle of elevation of the sun. 5. The angle of elevation of a cloud from a point 200 meters above a lake is 30° and the angle of depression of its reflection in the lake is 60°. Find the height of the cloud. 6. (a) From a boat 300 meters away from a vertical cliff, the angles of elevation of the top and the foot of a vertical concrete pillar at the edge of the cliff are 55° 40' and 54°20' respectively. Find the height of the pillar correct to the nearest meter. (b) From a man M, the angle of elevation of the top of a tree is 44°. What is the angle of elevation from the man of a bird perched half way up the tree? 7. The upper part of a tree broken by wind, falls to the ground without being detached. The top of the broken part touches the ground at an angle of 38° 30' at a point 6 m from the foot of the tree. Calculate (i) the height at which the tree is broken. (ii) the original height of the tree correct to two decimal places. 8. The angle of elevation of the top of a tower from a point A (on the ground) is 30°. On walking 50 m towards the tower, the angle of elevation is found to be 60°. Calculate (i) the height of the tower (correct to one decimal place). (ii) the distance of the tower from A. 9. From the top of a church spire 96 m high the angles of depression of two vehicles on a road, at the same level as the base of the spire and on the same side of it are x° and y°, where tan x° = 1/4 and tan y° = 1/7. Calculate the distance between the vehicles. 10. The shadow of a vertical tower on level ground increases by 10 m, when the altitude of the sun changes from 45° to 30°. Find the height of the tower correct to one decimal place. Answers 1. 86·6 meters 2. 173·2 m 3. 86·6 m 4. 30° 5. 400 m 6. (a) 21 m (b) 25° 46' 7. (i) 4·77 m (ii) 12·44 m 8. (i) 43·3 m (ii) 75 m 9. 288 m 10. 13·7 m Points to Remember :
1. Tangent to a circle at a point is perpendicular to the radius through the point of contact. 2. From a point P, lying on the circle, one and only one tangent can be drawn to it. 3. From a point, lying outside a circle, two and only two tangents can be drawn to it. 4. The lengths of the two tangents drawn from an external point to a circle are equal. 5. If two circles touch internally or externally, the point of contact lies on the straight line through the two centers. NCERT Solution X Ch-10 - Circles by topper learning View/Download File 10th Chapter : Tangent of Circle CBSE Test Paper-1 10th Chapter : Tangent of Circle CBSE Test Paper-2 10th Chapter : Tangent of Circle CBSE Test Paper-3 10th Chapter : Tangent of Circle CBSE Test Paper-4 10th Ch:Tangent of Circle CBSE Test Paper Solved -1 View/Download File 10th Solved Problems involving heights and distances
Download File X Chapter : Application of Trigonometry Test paper-1 Download File X Chapter : Application of Trigonometry Test paper-2 Download File X Chapter : Application of Trigonometry Question Bank Download File X Chapter : Application of Trigonometry Assignments Download File For more papers and Questions Visit Link Application of Trigonometry |
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