Which of the following are sets? Justify your answer (i) The collection of all the months of a year begimng with the letter "J". (ii) The collection of ten most talented writers of India. (iii) A team of eleven best cricket batsmen of the world. (iv) The collectionofall boys in your class. (v) The collection of all even integers.

(a) Write the function of each of the following parts of human eye : Cornea, iris, crystalline lens, ciliary muscles. (b) Millions of people of the developing countries of world are suffering from corneal blindness. These persons can be cured by replacing the defective cornea with the cornea of a donated eye. A charitable society of your city has organised a campaign in your neighbourhood in order to create awareness about this fact. If you are asked to participate in this mission how would you contribute in this noble cause? (i) State the objective of organising such campaigns. (ii) List two arguments which you would give to motivate the people to donate their eyes after death.

State the function of each of the following parts of the human eye : (i) Cornea (ii) Iris (iii) Pupil (iv) Retina Millions of people of the developing countries are suffering from corneal blindness. This disease can be cured by replacing the defective cornea with the cornea of a donated eye. Your school has organised a campaign in the school and its neighbourhood in order to create awareness about this fact and motivate people to donate their eyes after death. How can you along with your classmates contribute in this noble cause? State the objectives of organising such campaigns in schools.

In a particular section of class IX, 40 students were asked about thhe months of their birth the following graph was prepared for the data so obtained . Find the probability that a student of the class was born in August.

In a particular section of Class IX, 40 students were asked about the months of their birth and the following graph was prepared for the data so obtained .

The Class X students of a secondary school in Krishinagar have been alloted a rectangular plot of land for their gardening activity . Sapling of Gul mohar is planted on the boundary at a disatnce of 1m from each other . There is a triangular grassy lawn in the plot as shown in the figure . The students are to sow seeds of flowering plants on the remaining area of the plot . (i) Taking A as origin , find the coordinates of the vertices of the triangle . (ii) What will be the coordinates of the vertices of Delta PQR if C is the origin Also calculate the areas of the triangles i these cases . What do you observe ?

A student studying the force experienced by a current-carrying conductor in a magnetic field records the following observations : [i] The force experienced by the conductor increases as current is increased. [ii] The force experienced by the conductor decreases as the strength of the magnetic field is increased. Which of the two observations is correct and why?

A student studying the force experienced by a current-carrying conductor in a magnetic field records the following observations : [i] The force experienced by the conductor increases are current is increased. [ii] The force experienced by the conductor decreases as the strength of the magnetic field is increased. Which of the two observations is correct and why ?

The following distribution gives the state-wise teacher-student ratio in higher secondary schools of India. Find the mode and mean of this data. Interpret the two measures.

Read the passage given below and answer the questions that follow. Once, there was a renowned scholar who lived in a beautiful monastery with many of his pupils. He was known as a very effective teacher. Many of his students grew up to become great masters. One day, one of them was caught stealing from his fellow-students. They reported the incident to the teacher. But he took no action against the boy. A few days later the same boy was again caught stealing. And again the teacher did nothing to punish him. 'This made the other students angry. They requested the teacher to dismiss the thief. They even threatened to leave as a group if the boy was allowed to stay in the monastery'. The teacher called a meeting of the students. When they had assembled, he said to them: "You are good boys who know what is right and what is wrong. If you leave, you will have no trouble in joining some other school. But what about your brother who does not even know the difference between right and wrong? Who will teach him if I don't? No, I cannot ask him to go even if it means losing all of you. "Tears rolled down the cheeks of the boy who had stolen. He never stole and in later life became renowned for his integrity thereafter. Why was the teacher known to be very effective?