Please select a subject first
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Identify the odd word and explain why it is odd.
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What is meant by radioactivity?
Concept: undefined >> undefined
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When is said to be the nucleus unstable?
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Give a scientific explanation.
When the radiation coming out from a certain radioactive substance is passed through an electric field, marks are found at three places on the photographic plate placed in its path.
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Write two physical properties.
Charcoal
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Deduce the number of molecules of the following compound in the given quantity.
90g water
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Deduce the number of molecules of the following compound in the given quantity.
8.8g carbon dioxide
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Deduce the number of molecules of the following compound in the given quantity.
7.1 g chlorine
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If 0.2 mol of the following substance is required how many grams of that substance should be taken?
magnesium oxide
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If 0.2 mol of the following substance is required how many grams of that substance should be taken?
Calcium carbonate
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Give two examples from everyday life of the neutralization reaction.
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Choose one or more correct alternatives.
Which of the forces involved in dragging a heavy object on a smooth, horizontal surface, have the same magnitude?
- The horizontal applied force
- gravitational force
- reaction force in vertical direction
- force of friction
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The total energy of an object falling freely towards the ground ______.
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Give a reason for the following.
Buttermilk spoils if kept in a copper or brass container.
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Write the chemical equation for the following activity.
Zinc dust was added to dilute H2SO4.
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Write the chemical equation for the following activity.
Dilute nitric acid was added to calcium oxide.
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Write down the changes that will be seen in the instance and explain the reason behind them.
Two or three filings of copper were added to 10 ml dilute nitric acid and stirred.
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Write down the changes that will be seen in the instance and explain the reason behind them.
Dilute HCl was added to the limestone.
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Match the pairs and explain.
| ‘A’ | ‘B’ |
| 1. Growth of pollen tube towards ovule | a. Gravitropic movement |
| 2. Growth of shoot system | b. Chemotropic movement |
| 3. Growth of root system | c. Phototropic movement |
| 4. Growth towards water | d. Growth-irrelevant movement |
| e. Hydrotropic movement |
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Explain in your own words with a suitable example.
What is meant by coordination?
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