Science 2005 CBSE [ All India ] Set II
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Q1
Name two metals both of which are very ductile as well as very malleable. Marks:1View AnswerAnswer:
Silver and Gold. -
Q2
What are the values of (i) the angle of incidence, and (ii) the angle of reflection for normal incidence on a plane mirror surface? Marks:1View AnswerAnswer:
The angle of incidence and reflection will be 00 for normal incidence on a plane mirror surface. -
Q3
A wire of resistance 10 ohm is bent in the form of a closed circle. What is the effective resistance between the two points at the ends of any diameter of the circle? Marks:1View AnswerAnswer:
Effective resistance (R) between the two points at the end of the diameter of the circle is a combination of two 5 ohm resistances.
1/R = 1/5 +1/51/R = 2/5 R = 2.5 ohm -
Q4
Write the full form of IUCD. Marks:1View AnswerAnswer:
Out of syllabus. -
Q5
Why is it necessary to conserve our environment? Marks:1View AnswerAnswer:
We are the part of our environment and fulfill our needs through the environment. Any kind of harm will finally affect us hence we need to conserve our environment. -
Q6
A wire of resistance 5 ohm is bent in the form of a closed circle. What is the effective resistance between the two points at the ends of any diameter of the circle? Marks:1View AnswerAnswer:
Effective resistance (R) between the two points at the end diameter of the circle is a combination of two 2.5 ohm resistances. 1/R = 1/2.5 +1/2.5 1/R = 2/2.5 R = 1.25 ohm -
Q7
Write the chemical equation to represent the reaction taking place between sodium metal and cold water. Marks:1View AnswerAnswer:
2Na + 2H
2 O 
2NaOH + H2 -
Q8
What is 'retrovirus'? Marks:1View AnswerAnswer:
Out of syllabus. -
Q9
What happens when crystals of washing soda are left open in dry air? What is this change named as? Name two industries based on use of washing soda. Marks:2View AnswerAnswer:
When crystals of washing soda are left open in air, the crystals lose 9 of their water molecules. Second part of the question is out of syllabus. Two industries based on washing soda are glass and soap industries. -
Q10
Explain the principle involved in the launching of artificial satellites.Out of syllabus Marks:2View AnswerAnswer:
Out of syllabus.
