There are three main groups of oils-animal, vegetable and mineral. Great quantities of animal oil come from whales, creatures of the sea, which are the largest of the animals remaining in the world. To protect the whales from the cold of the Artic seas, nature has provided them with a thick covering of fat, called blubber. When the whale is killed, the blubber is stripped off and boiled down. It produces a great quantity of oil which can be made into food for human consumption. A few other creatures yield oil, but none so much as the whale. The livers of the cod and halibut, two kinds of fish, yield nourishing oil. Both cod liver oil and halibut oil are given to sick children and other invalids who need certain vitamins.. 
Vegetable oil has been known from very old times. No household can get on without it, for it is used in cooking. Perfumes may be made from the oils of certain flowers. Soaps are made from eatable and animal products and the oils of certain flowers. 

The main source of animal oil, is –

गणेश्वर की सभ्यता ———— में स्थित थी।

दो स्थानों की दूरी 342 किमी. है से दो ट्रेन एक दूसरे की तरफ 30 किमी/घं. और 27 किमी/घं. की चाल से चलती है तो वे कितने समय बाद मिलेंगी? (घंटो में) 

निम्नलिखित में से कौन - सा खनिज सिंघाना के मदान- कुदान क्षेत्र में निकलता है ?

192.161.121.100 किस श्रेणी का उदाहरण है?

उस अक्षर का चयन करें जो निम्नलिखित श्रृंखला में आगे आएगा।
O, R, U, X, A, ___

राम वायुयान द्वारा 1200 किमी. की दूरी तय करता है जिससे वह यात्रा का 2 / 5 भाग तय कर लेता है । वह एक तिहाई भाग कार द्वारा तथा शेष बचा भाग रेलगाड़ी द्वारा तय करता है। रेलगाड़ी द्वारा तय की गयी दूरी ( किमी. में ) ज्ञात करें ?