Science 2009 CBSE [ Delhi ] Set III
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Q1
What would be the colour of litmus in a solution of sodium carbonate?
Marks:1View AnswerAnswer:
Litmus will be of blue colour in the solution of sodium carbonate because it is basic in nature.
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Q2
Name a reducing agent that may be used to obtain manganese from manganese dioxide.
Marks:1View AnswerAnswer:
Sodium, being more reactive than manganese, can be used to reduce manganese from manganese dioxide.
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Q3
Balance the following chemical equation:
Marks:1View AnswerAnswer:
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Q4
Take down this figure into your answer book and complete the path of the ray.
Marks:1View AnswerAnswer:
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Q5
Why does sky look blue on a clear day?
Marks:1View AnswerAnswer:
The sky appears blue on a clear day because air scatters short-wavelength light more than longer wavelengths. So, blue light is of short wavelength present at the end of the visible spectrum, and is more strongly scattered in the atmosphere than long wavelength red light.
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Q6
Why does a ray of light bend when it travels from one medium into another?
Marks:1View AnswerAnswer:
The speed of light is different in different media. When the ray of light travels from one medium into another it bends because the speed of the light changes.
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Q7
What will happen to a plant if its xylem is removed?
Marks:1View AnswerAnswer:
Water will not be transported from roots to other parts.
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Q8
Define ‘Chemotropism.’
Marks:1View AnswerAnswer:
Chemotropism is the movement caused by chemical stimulus in organisms, e.g., growth of pollen tube.
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Q9
What are the two main components of our environment?
Marks:1View AnswerAnswer:
Biotic (living organisms) and abiotic( non-living) components.
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Q10
Define a combination reaction. Give one example of a combination reaction, which is also exothermic.
Marks:2View AnswerAnswer:
When two or more substances combine to form a single product, the reaction is called combination reaction.
Almost all the combination reactions are exothermic. For example:
