Which of the following statement(s) is/are true?I. The variable that c..
Which of the following statement(s) is/are true? I. The variable that cannot be controlled or manipulated is dependent variable. II. Independent variable is plotted on the y-axis. III. A relationship between four variables only is called multiple re..
Variable
Quantities such as height, weight, age, amount can have several different values. Quantities which can assume different numerical values are called variables. Variables are of two types: (a) Continuous (b) Discre..
Variables
A set of observations is called a called a collection of data. These observations should possess some common characteristics. They are recorded and used for further study. The quantities such as age, height and number of students are called variables..
Gene Manipulation (Genetic Engineering)
Genetic engineering can be described as an in vitro manipulation of genes. It refers to artificial synthesis, modification, removal, addition and repair of the genetic material (DNA) to alter the genotype at will. It has evoked great interest because it may enable the geneticists in the n..
c) Manipulation zone or Transition zone
Several human activities can occur in the manipulation zone. Example: Settlements, cropping, forestry, recreation e..
Variable acceleration
A particle is said to move with variable acceleration if its velocity changes by unequal amounts in equal intervals of time. When a particle moves with variable acceleration, then its average acceleration measured for different time intervals is not the same. In the case of ..
Random Variable:
random variable is a function which associates a real number to each outcome of a random experiment..
Continuous Variable
Consider an example. A person was asked to measure the thickness of a coin. He recorded the following readings: (i) 0.2 cm with ruler (ii) 0.23 cm with vernier (iii) 0.231 cm with micrometer The accuracy of thickness of the coin depended on the instrument used for measuring the thickness. Thus the..
Variable Valency
Variable Valency - Normally metals donate electrons from their valence shell so as to form positively charged ions such that the charge on the ion is equal to its electropositive valency. However, in transition elements, an atom loses electrons from the shell next to the valence shell (pe..
Variable Speed
Example: A rubber ball dropped from a certain height (h 1 ) on reaching the ground bounces up to a height less than the initial one (h 2 ). It continues to bounce but the height to which it rises keeps decreasing (h 3 , h 4 ). The distance covered by the ball in unit time decreases. The speed of t..
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