Question
Why should oils and fats be not released in the drain? Explain.
✓
Answer
Oils and fats harden and block the sewage pipes. In an open drain also, fats block porosity of soil which affects its water filtering efficiency. That is why oils and fats should not be released in the drain.
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Read the following story titled ‘Eco-friendly Prithin’, and tick the most appropriate option(s) given in the brackets. Provide a suitable title of your choice for the story.
Prithvi is preparing a meal in the kitchen. He chops vegetables, peels potatoes, and cuts fruits (physical changes/chemical changes). He collects the seeds, fruits, and vegetable peels into a clay pot (physical change/ chemical change). The fruits, vegetable peels, and other materials begin to decompose due to the action of bacteria and fungi, forming compost (physical change/chemical change). He decides to plant seeds in the compost and water them regularly. After a few days, he notices that the seeds begin to germinate and small plants start to grow, eventually blooming into colourful flowers (physical change/chemical change). His efforts are appreciated by all his family members.
Prithvi is preparing a meal in the kitchen. He chops vegetables, peels potatoes, and cuts fruits (physical changes/chemical changes). He collects the seeds, fruits, and vegetable peels into a clay pot (physical change/ chemical change). The fruits, vegetable peels, and other materials begin to decompose due to the action of bacteria and fungi, forming compost (physical change/chemical change). He decides to plant seeds in the compost and water them regularly. After a few days, he notices that the seeds begin to germinate and small plants start to grow, eventually blooming into colourful flowers (physical change/chemical change). His efforts are appreciated by all his family members.
Explain concave lens and there application.
Take three test tubes. Fill 3/4th of each with water. Label them A, B and C. Keep a snall in test tube A, a water-plant in test tube B and in C, keep snall and plant both. Which test tube would have the highest concentration of $CO _2$ ?
→How does chewing food properly help in digestion?
Write three ways by which we can conserve water.
Observe the given diagram of human heart and label all the parts from $A$ to $H.$
→The smallest time interval that can be measured with commonly available clocks and watches is one second. However, special clocks are available that can measure time intervals smaller than a second. Some of these can measure time intervals as small as one millionth or even one billionth of a second.
1. A micro-second is a very small time interval. Write its value in fraction of a second.
2. Define time period.
3. What is the basic unit of time?
1. A micro-second is a very small time interval. Write its value in fraction of a second.
2. Define time period.
3. What is the basic unit of time?
Explain the two types of fibres.
On last Monday, Pankaj was dealing with immense cough and cold. Besides this, he was suffering from a headache. So, he decided to take a leave on that day so that he could take some rest at his home. After one hour he thought to check his fever through a clinical thermometer, so before using it, he washed it and started shaking it very fastly in his hand, so that the mercury level of thermometer gets reduced. At the same time, his elder brother Vishwas scold him and suggested him to shake the thermometer slowly.
(i) State some precautionary measures while checking the fever through a clinical thermometer.
(ii) Mention the values showed by the elder brother of Pankaj (i.e. Vishwas).
(i) State some precautionary measures while checking the fever through a clinical thermometer.
(ii) Mention the values showed by the elder brother of Pankaj (i.e. Vishwas).
During a visit to an observatory, Maya observed a solar eclipse through a special protective lens. The Moon was between the Earth and the Sun, blocking the Sun’s light. Maya was told that it was important never to look directly at the Sun during such an event.
(i) Why is it dangerous to look directly at the Sun during a solar eclipse?
(ii) What happens during a solar eclipse?
(iii) How should one safely observe a solar eclipse?
(i) Why is it dangerous to look directly at the Sun during a solar eclipse?
(ii) What happens during a solar eclipse?
(iii) How should one safely observe a solar eclipse?