CBSE Guess > Papers > Question Papers > Class X > 2008 >Science > Science Theory

Q. 4. What is the difference in the molecular formula of any two consecutive members of a homologous series of organic compounds?

Ans. The two consecutive members of a homologous series of organic compounds differ by CH2 (i.e. one carbon and two hydrogen).

Q. 5. Redraw the given diagram and show the path of the refracted ray :

Q. 6. Element M forms a chloride with the formula MCl2 which is a solid with high melting point. To which group of the Periodic Table does the element ‘M’ belong?

Ans. M forms MCl2, a solid with high melting point. This information shows that the valency of M is 2 or M loses two electrons. Therefore M belongs to the group II of the periodic table.

Q. 7. Study the following circuit and answer the questions that follow

(a) State the type of combination of the two resistors in the circuit.
(b) How much current is flowing through

1. 0 . and through
2. 15 . resistors?
   

(c) What is the ammeter reading?

Science 2008 Question Papers Class X
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