Science:2010:CBSE:[All India]:Set-II
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Q1
A person is advised to wear spectacles with convex lenses. What type of defect of vision is he suffering from?
Marks:1View AnswerAnswer:
He is advised to use convex lens as he cannot see the nearby object clearly, so he is suffering from hypermetropia.
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Q2
Name the process in plants where water is lost as water vapour.
Marks:1View AnswerAnswer:
The loss of water in the form of water vapour takes place through stomata in the plants and the process is known as transpiration.
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Q3
Mention the function of the hind brain in humans.
Marks:1View AnswerAnswer:
The main function of hind brain in humans is to maintain the posture and balance of the body. It is responsible for the precision of voluntary actions like walking in straight line, and riding a bicycle.
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Q4
The pH of a sample of vegetable soup was found to be 6.5. How is this soup likely to taste?
Marks:1View AnswerAnswer:
pH < 7 is acidic
pH > 7 is basic
pH = 7 is neutral
Since the pH is 6.5, i.e., below 7, so the soup is acidic in nature and is sour to taste.
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Q5
Write the names and chemical formulae of the products formed by heating gypsum at 373 K.
Marks:1View AnswerAnswer:
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Q6
Why do different components of white light deviate through different angles when passing through a triangular glass prism?
Marks:1View AnswerAnswer:
The speed of light in glass is different for different components of white light and the refraction index of glass is different for different colours. Hence, they deviate thought different angles.
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Q7
Give one reason why multicellular organisms require special organs for exchange of gases between their body and their environment.
Marks:1View AnswerAnswer:
In multicellular organisms, all the cells are not in direct contact with the external environment; therefore, direct exchange of gases cannot take place. Hence, they require special organs for exchange of gases.
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Q8
Which bases are called alkalis? Give an example of alkalis.
Marks:1View AnswerAnswer:
The bases which are soluble in water are called alkalis. For example: NaOH, KOH.
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Q9
What will be the observed colour of the sky on a planet where there is no atmosphere? Why?
Marks:1View AnswerAnswer:
The sky would appear to be dark because no light would be scattered to the observer’s eye.
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Q10
List any four changes you would like to incorporate in your lifestyle in a move towards a sustainable use of available resources in our country.
Marks:2View AnswerAnswer:
(i) Use of bicycle instead of scooter to go to school.
(ii) Switching off the lights, fans etc. when not in use.
(iii) Pooling car instead of using individually.
(iv) Minimising the use of plastics.
