Evaluate what kinds of environmetanl issues can happen by seeing following simptom-
Frequent cough and secretion of greenish-yellow cuff.

How the take off and landing of aeroplance causes air-pollution? Evaluate what kinds of environmetanl issues can happen by seeing following simptom- Fluid deposition in chest and chest pain.

Decide whether the following statements are true or false: Greenish-yellow cough secrete out in case of bronchitis.

Shankar made the following pictures also. What shapes can they be broken into, of which we can find area easily ? Make some more pictures and think of the shapes they can be divided into different parts.

Secretion of saliva seeing delicious food'- What kind of reflex action is it? Write you opinion about it.

Find the number of positive integers, which can be formed by using any number of digits from 0, 1, 2, 3, 4, 5 but using each digit not more than once in each number. How many of these integers are greater than 3000? What happened when repetition is allowed?

A long -sighted man can clearly see at any distance beyond 2.5 m . What kind of lens in his spectacles does require to read books placed 25 cm from his eyes?

A person who can see objects clearly at a distance of 10cm , requires spectacles to be able to see clearly objects at a distance of 30 cm. what type of spectacle should he use? Find the focal length of the lens.

A Person who can see objects clearly at a distance of 10cm, required spectacles to be able ot see clearly objects at a distance of 30cm. What types of spectacle should he use? Find the focal length of the lens.

Let X denote the number of hours you study during a randomly selected school day. The probability that X can take the values x, has the following form, where k is some unknown constant. P(X=x)={{:(0.1, "if "x =0),(kx, "if "x = 1 or 2 ),(k(5-x), "if " x=3 or 4),(0,"otherwise"):} (a) Find the value of k. (b) What is the probability that you study at least two hours ? Exactly two hours? At most two hours?