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

SCIENCE (Theory) -2008
Comptt.
(Set III - Delhi)

Time allowed : 21/2 hours
Maximum marks : 60

General Instructions:
(i) The question paper comprises of two Sections, A and B. You are to attempt both the Sections.
(ii) All questions are compulsory.
(iii) There is no overall choice. However, internal choice has been provided in all the three questions of five marks category. Only one option in such questions is to be attempted.
(iv) All questions of Section A and all questions of Section B are to be attempted separately.
(v) Questions number 1 to 6 in Section A and 17 to 19 in Section B are short answer type questions. These questions carry one mark each.
(vi) Questions number 7 to 10 in Section A and 20 to 24 in Section B are short answer type questions and carry two marks each.
(vii) Questions number 11 to 14 in Section A and 25 and 26 in Section B are also short answer type questions and carry three marks each.
(viii) Questions number 15 and 16 in Section A and question number 27 in Section B are long answer type questions and carry five marks each.

Section A

Q.1. How is the refractive index of an optical medium related to the speed of light in that medium?

Ans. The ratio of speed of light in vacuum to the speed of light in a medium is called refractive index of that medium.

Ans. Silver is the best conductor of electricity because it has the lowest resistivity out of the three.

Q. 2. Identify the type of reaction in the following example :

Na₂SO₄ (aq) + BaCl₂ (aq) BaSO₄ (s) + NaCl (aq)

Ans. Na₂SO₄ (aq) + BaCl₂ (aq) → BaSO₄ (s) + NaCl (aq) Double displacement reaction.

Q. 3. If a light ray IM is incident on the surface AB as shown, identify the correct emergent ray.

Ans. NQ is the correct emergent ray because NQ ray is parallel to the incident ray (OS) in case of glass slab.

Science 2008 Question Papers Class X
Delhi		Outside Delhi		Compartment Delhi		Compartment Outside Delhi
	All Sets (PDF)				Set 1		Set 1
					Set 2		Set 2
					Set 3		Set 3