Science 2005 CBSE [ All India ] Set I
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Q1
Write the chemical equation to represent the reaction taking place when copper oxide is heated in a stream of hydrogen. Marks:1View AnswerAnswer:
CuO + H2
Cu + H2O -
Q2
Biological reactions in our body depend on the presence of biocatalysts. What name is given to these catalysts? How is their activity influenced by changes in temperature? Out of syllabus. Marks:1View AnswerAnswer:
Out of syllabus. -
Q3
Name two metals both of which are very ductile as well as very malleable. Marks:1View AnswerAnswer:
Silver and Gold. -
Q4
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. -
Q5
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 -
Q6
Write the full form of IUCD. Marks:1View AnswerAnswer:
Out of syllabus. -
Q7
What is the function of genes in an organism? Marks:1View AnswerAnswer:
Genes are the segments of DNA which control the traits and characteristics of an individual. -
Q8
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. -
Q9
Light enters from air into a glass plate which has a refractive index of 1.50. Calculate the speed of light in glass. The speed of light in air is 3.0 x 108 ms-1. Marks:2View AnswerAnswer:
Speed of light in air = 3.0 x 108 ms-1
Let, speed of light in glass = v
Refractive index of glass (n) = 1.50
n = speed of light in air/speed of light in glass
1.50 = (3.0 x 108) / v
Or,v = (3.0 x 108) / 1.50
Or,v = 2.0 x 108 ms-1 -
Q10
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.
