What would be the advantages of exploiting resources with short-term aims?
Exploiting resources with the short- terms aims gave the advantage that our present generation will be able to meet the requirements and the rate of growth at the faster and the immediate rate. It also helps in the growth at the faster rate of economy as well. We should also stop the unlimited use of the natural resources as they are very limited. We should not overuse the natural resources as they are present for our short- terms gains that would only lead to the depletion of the resources for our present generation or as well as for the future generation. Most probably we should use the long- term or long ranging natural resources so that we can fulfil the requirements of human basic needs of their present generation and as well as for their future generations.
When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.
Outline a project which aims to find the dominant coat colour in dogs.
Draw the structure for the following compounds.
(i) Ethanoic acid (ii) Bromopentane*
(iii) Butanone (iv) Hexanal.
*Are structural isomers possible for bromopentane?
A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 Ω resistance, which may be used separately, in series, or in parallel. What are the currents in the three cases?
How is the sex of the child determined in human beings?
(a) What property do all elements in the same column of the Periodic Table as boron have in common?
(b) What property do all elements in the same column of the Periodic Table as fluorine have in common?
Calculate the number of electrons constituting one coulomb of charge.
What is an homologous series? Explain with an example.
Why is variation beneficial to the species but not necessarily for the individual?
A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits – blood group A or O – is dominant? Why or why not?
What is a good fuel?
Why is the amount of gas collected in one of the test tubes in Activity 1.7 double of the amount collected in the other? Name this gas.
An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. Find the position and nature of the image.
Find the power of a concave lens of focal length 2 m.
What does one mean by exothermic and endothermic reactions? Give examples.
What are the components of the transport system in human beings? What are the functions of these components?
Why do you think the noble gases are placed in a separate group?
Why do you think that there should be equitable distribution of resources? What forces would be working against an equitable distribution of our resources?
Define 1 dioptre of power of a lens.
What are the components of the transport system in highly organised plants?