Question
Why is mercury used as an indicator in a thermometer?
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Answer
- Mercury expands evenly as the temperature rises.
- It is a good conductor of heat.
- It is silvery white and can be seen from outside the glass.
- It does not stick to glass.
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- Used water.
- A pipe carrying sewage.
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- A chemical to disinfect water.
Explain how increasing population is responsible for depletion of water table.
Given below are the figures representing various components of a food chain. Make 3 food chains using these figures. Make some to use each figure atleast once. Also, some figure can be used more than once.
Complete the data of the table given below with the help of the distance-time graph given in figure.
Distance (m) | 0 | 4 | ? | 12 | ? | 20 |
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During the summer vacations, Gaurav visited his native village. He observed that farmers were using pesticides in their field. He contacted the village head and explained him the effects of such substances in causing soil pollution. Next day, the village head called a meeting of all the villagers and convinced the villagers not to use chemicals and pesticides.
- Why is there a ban to demand the polythene bags and plastics.
- List some substances which pollute the soil.
- What are the values shown by Gaurav?
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Fig. Two thermometers dipped in two test tubes
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Differentiate between uniform and non-uniform motion.
Describe nutrition in amoeba.
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Read the passage and answer the questions :
Rashmika noticed that the shadows of trees on her way to school were long in the morning and much shorter in the afternoon. She began to wonder why the size of the shadows changed throughout the day.
Q.1. What causes the length of a shadow to change during the day?
(a) The shape of the object
(b) The movement of the Earth around the Sun
(c) The change in the Sun's position in the sky due to Earth's rotation
(d) The distance between the Earth and the Sun
Q.2. When would Rashmika observe the shortest shadow of a tree?
(a) Early morning$\quad$(b) Late evening
(c) Noon$\quad$$\quad$(d) Midnight
Q.3. Which direction does a shadow point at noon in India?
(a) East$\quad$$\quad$(b) West
(c) South$\quad$$\quad$(d) North
→Rashmika noticed that the shadows of trees on her way to school were long in the morning and much shorter in the afternoon. She began to wonder why the size of the shadows changed throughout the day.
Q.1. What causes the length of a shadow to change during the day?
(a) The shape of the object
(b) The movement of the Earth around the Sun
(c) The change in the Sun's position in the sky due to Earth's rotation
(d) The distance between the Earth and the Sun
Q.2. When would Rashmika observe the shortest shadow of a tree?
(a) Early morning$\quad$(b) Late evening
(c) Noon$\quad$$\quad$(d) Midnight
Q.3. Which direction does a shadow point at noon in India?
(a) East$\quad$$\quad$(b) West
(c) South$\quad$$\quad$(d) North