Science 2005 CBSE [ Delhi ] Set I
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Q1
Give an example of photochemical reactions. Marks:1View AnswerAnswer:
Out of syllabus. -
Q2
Name a metal which offers higher resistance to the passage of electricity than copper. Marks:1View AnswerAnswer:
Iron -
Q3
State a reaction in which SO2 acts as an oxidising agent. Out of syllabus. Marks:1View AnswerAnswer:
Out of syllabus. -
Q4
Where will the image be formed by a concave mirror when an object is placed between the pole and the focus point of the mirror? Marks:1View AnswerAnswer:
The image will be formed behind the mirror when an object is placed between the pole and the focus point of the concave mirror. -
Q5
Which has a higher resistance: a 50 W lamp bulb or a 25 W lamp bulb and how many times? Marks:1View AnswerAnswer:
A 25 W lamp bulb has a higher resistance and it will be twice than that of the 50 W lamp bulb. -
Q6
Write the expanded form of the abbreviation AIDS. Marks:1View AnswerAnswer:
Out of syllabus. -
Q7
Why is one arm in sub-metacentric chromosome longer than the other? Marks:1View AnswerAnswer:
Out of syllabus. -
Q8
What is 'Green House Effect'? Marks:1View AnswerAnswer:
The phenomenon of trapping of reflected infrared sunrays by gases like carbon dioxide in the atmosphere is called as Green-house effect. -
Q9
How is plaster of Paris chemically different from gypsum? How may they be interconverted? Write one use of plaster of Paris. Marks:2View AnswerAnswer:
Plaster of Paris is calcium sulphate hemihydrate whereas gypsum is calcium sulphate dihydrate. Plaster of Paris can be converted to gypsum by mixing it with water. Gypsum can be converted to plaster of Paris by heating gypsum at 373 K. Plaster of Paris is used to make toys and decorative materials. -
Q10
Allotropy is a property shown by which class of substances, elements, compounds or mixtures? Give one example of allotropy. Marks:2View AnswerAnswer:
Allotropy is a property shown by elements. It is the property of an element to exist in different physical forms e.g. the two allotropes of carbon are diamond and graphite.
