A child staying in a coastal region tests the drinking water and also the seawater with his tester. He finds that the compass needle deflects more in the case of seawater. Can you explain the reason?

A child starting in a coastal region tests the drinking water and also the sea water with his tester. He finds that the compass needle deflects more in the case of sea water. Can you explain the. Reason

A child syaying in the coastal region tests the drinking water and the sea water with his tester. He finds that the compass needle deflects more in the case of sea water. Can you explain the reason?

Explain why water is not used as an extinguisher in case of electrical fire.

Mohan went to his ancestral village during the summer holidays t met his uncle (chacha ji) and his family. Mohan's uncle has a very big house in the village but they have no piped water supply. They draw water from a well near their house. One day Mohan took a bucket of water from the well and started washing his dirty clothes with soap given by his aunt. Mohan observed that the soap did not give lather with well water easily, only a curdy precipitate was formed making it difficult to wash the clothes properly. Mohan had brought a packet of some powder withhim from the city. So mohanused this powder to wash his clothes with well water without facing any difficulty. Mohan explained everything to hisuncle's family and advised them to stop using for washing clothes by suing well water and asked them to use the powder which he had for washing clothes with the same well water easily. (a) What type of water is the wel water? Why? (b) Why is soap not suitable for washing clothes with well water? (c) What was the powder used by Mohan for washing clothes easily even with well water? (d) Why is this powder for washing clothes suitable even with well water? (e) What values are displayed by Mohan in this episode?

Rajan went on a World Tour with his family during the summer holidays. Actually, it was a group tour consisting of 40 persons arranged by a leisure travel company. Thomas Cook'. Today the whole group was taken to a sea that lies between Is real and Jordan, and has become a famous tourist spot. On reaching the seashore, everyone was surprised to see a person floating in this sea water in the sitting position and even reading a newspaper in this position. The Guide, Mr. Jose, who accompanied the group, asked if anyone could explain this strange observation. Rajan is a science student of class IX. Rajan took a little of sea water in his palm and put it into his mouth for a moment (and then spit it out). After thinking for a while, he could answer Mr, Jose's question. Rajan then explained everything very clearly to all the persons in the group. Everyone appreciated his knowledge of science. (a) What is the name of the sea which lies between Isreal and Jordan? (b) Why is this sea called by this name? (c) What did Rajan find when he put a little of water from this sea into his mouth for a moment? (d) Explain why, a person can float in this sea water in the sitting position. (e) Why is it not possible to float in sitting position in the water of Indian sea? (f) What values are displayed by Rajan in this episode?

You have seen homes, shops and factories caught in fire news, or in newspaper, or in real. Do you think how can the fire be controlled from spreding? Generally, water is used to control fire. Water brings down the temperature of the combustible substance below its ignition temperature. The water vapour surrounds the combustible material, thus helping in cutting off the supply of air. Fire produced by the burning of oil or petrol cannot be controlled by throwing water on it because water being heavier than oil, settles down the oil and oil continues to burn. In the case of fires caused by burning liquid fuels, such as kerosene oil can be controlled by throwing sand or soil over it. Read the below questions and try to answer them. Can you use CO_(2) extinguisher on electrical fires?

You have seen homes, shops and factories caught in fire news, or in newspaper, or in real. Do you think how can the fire be controlled from spreding? Generally, water is used to control fire. Water brings down the temperature of the combustible substance below its ignition temperature. The water vapour surrounds the combustible material, thus helping in cutting off the supply of air. Fire produced by the burning of oil or petrol cannot be controlled by throwing water on it because water being heavier than oil, settles down the oil and oil continues to burn. In the case of fires caused by burning liquid fuels, such as kerosene oil can be controlled by throwing sand or soil over it. Read the below questions and try to answer them. What should you do if you use a carbon dioxide fire extinguisher?

You have seen homes, shops and factories caught in fire news, or in newspaper, or in real. Do you think how can the fire be controlled from spreding? Generally, water is used to control fire. Water brings down the temperature of the combustible substance below its ignition temperature. The water vapour surrounds the combustible material, thus helping in cutting off the supply of air. Fire produced by the burning of oil or petrol cannot be controlled by throwing water on it because water being heavier than oil, settles down the oil and oil continues to burn. In the case of fires caused by burning liquid fuels, such as kerosene oil can be controlled by throwing sand or soil over it. Read the below questions and try to answer them. Expalin why fire extinguisher use carbon dioxide?

You have seen homes, shops and factories caught in fire news, or in newspaper, or in real. Do you think how can the fire be controlled from spreding? Generally, water is used to control fire. Water brings down the temperature of the combustible substance below its ignition temperature. The water vapour surrounds the combustible material, thus helping in cutting off the supply of air. Fire produced by the burning of oil or petrol cannot be controlled by throwing water on it because water being heavier than oil, settles down the oil and oil continues to burn. In the case of fires caused by burning liquid fuels, such as kerosene oil can be controlled by throwing sand or soil over it. Read the below questions and try to answer them. Give 3 conditions necessary for producing and sustaining combustion