10th Class

  Space Exploration     SPACE SCIENCE IN WORLD

• The term "outer space" or "space" now usually refers to the vast limitless expanse that exists beyond the Earth's atmosphere.
• Space contains all the stars, planets, gases and dust particles, meteorites, comets, asteroids and radiations.
• The first step into space was taken on 4 October 1957 by the erstwhile Soviet Union (USSR), which successfully launched the first satellite named "Sputnik I" into space.
• Satellite, in general, refers to celestial body that revolves around a planet. The moon, for example, is a natural satellite of the planet Earth. These days, however, the term satellite is used for man made satellites which revolve around the Earth.
• The closed path of a satellite around the Earth is called its orbit. It may be circular or elliptical in shape.
• The characteristics define an orbit are apogee, perigee and more...

  Logic   Logic   The term “logic” came from the Greek word logos, which is sometimes translated as “sentence” “discourse”, “reason”, “rule”, and “ratio” Briefly speaking, we might define logic as the study of the principles of correct reasoning or the study of the principles of reasoning, especially of the structure of propositions as distinguished from their content and of method and validity in deductive reasoning.               Proposition: In logic, any categorical statement is termed as the proposition.             The standard form of proposition is consists of four parts

• Quantifier
• Subject
• Copula
• Predicate

              Example: 1                         All              \[\to \]       books        \[\to \]       are        \[\to \]       pens  \[\downarrow \]                             \[\downarrow \]                        \[\downarrow \]                      \[\downarrow \]             Quantifier   \[\to \]        subject      \[\to \]     more...

  Statement & Argument   Statement - Argument In this part of logical reasoning a statement concerned with a social, political or economical issue is given along with two arguments - in favour of or against the statement. A strong argument is one which says the practical and real aspect of the situation as described in the statement, while the weak argument is ambiguous, superfluous and very simple. The candidate is required to analyze first the statement, then argument in context of the statement and finally decide which of the arguments is strong and is helping and to formulate the most appropriate opinion of the subject given in statement.   Remember you are required to form an opinion only in the light of the given arguments and not on the more...

  Statement & Assumption   Statement-Assumption   An assumption is something taken for granted i.e., a fact that can be supposed on considering the contents of the given statement. Type: 1 In this part of reasoning, a statement is given followed by two assumptions. The candidate is required to assess the given statement and then decide which of the given assumptions is implicit in the statement.   Example: 1.