Science 2004 CBSE [ Delhi ] Set I
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Q1
What force makes an apple on a tree to fall to the ground and what fo rce makes a balloon filled with hydrogen to rise into air? Out of syllabus Marks:1View AnswerAnswer:
Out of syllabus. -
Q2
Write the function of hormone ‘thyroxin’ in our bodies. Marks:1View AnswerAnswer:
Thyroxin regulates body growth by regulating metabolism of carbohydrate, protein and fats. -
Q3
Name the part of hind brain which takes part in regulation of respiration. Marks:1View AnswerAnswer:
Medulla takes part in regulation of respiration. -
Q4
Give an example of a vestigial organ present in human body. Marks:1View AnswerAnswer:
Out of syllabus. -
Q5
Draw a figure to show how the rate of a chemical reaction in general changes as the temperature of reactants is increased step-wise. Marks:1View AnswerAnswer:
Out of syllabus. -
Q6
Name the classes of organic compounds represented by the following formulae-
(i)
(ii)
Marks:1View AnswerAnswer:
(i) Amino ethane Out of syllabus.
(ii) Ketone -
Q7
Name any two neutral oxides. Marks:1View AnswerAnswer:
Out of syllabus. -
Q8
What type of force or forces keep the Sun and its planets in their
respective places?Out of syllabus Marks:1View AnswerAnswer:
Out of syllabus. -
Q9
How can it be shown that a magnetic field exists around a wire through which a direct electric current is passing? Marks:1View AnswerAnswer:
Magnetic field around a current carrying wire can be shown by deflection of magnetic needle of magnetic compass. -
Q10
Leaves of a healthy potted plant were coated with vaseline to block the stomata. Will this plant remain healthy for long? State three reasons for your answer. Marks:2View AnswerAnswer:
No, the plant will not remain healthy due to following reasons:
(a) Exchange of gases will not take place and plant will not be able to respire properly. (b) Photosynthesis will not occur properly in the absence of CO 2. (c) Due to blockage of stomatal openings transpiration is also effected.
