Science – 2007 (Delhi Set - 1)
General Instructions:
- The question paper comprises two Sections, A and B. You are to attempt both the Sections.
- The candidates are advised to attempt all the questions of Section A separately and Section B separately.
- All questions are compulsory.
- There is no overall choice. However, internal choice has been provided in some questions.You are to attempt only one option in such questions.
- Marks allocated to every question are indicated against it.
SECTION - A
Q. 1. Classify the following reactions into slow and fast reaction :
- Reaction between an acid and a base,
- Rusting of iron. (1marks)
Q. 2. Give the names of the functional groups
(i) — CHO
|
(ii) — C=O 1
Q. 3. What is a Galaxy ?(1marks)
Q. 4. What is the S.I. unit of electric potential ? (1marks)
Q. 5. (a) Give Arrhenius definition of an acid and a base.(1 marks)
(b) Choose strong acid and strong base from the following :
CH3COOH, NH4OH, KOH, HCl. 2
Q. 6. What is Tollen’s reagent ? What would you observe on heating Tollen’s reagent with formalin in a test tube ? (2 marks)
Q. 7. Distinguish between polar and equatorial orbits for artificial satellites. Illustrate the two orbits on a diagram.( 2 marks)
Science – 2007 (Outside Delhi Set - 1)
SECTION - A
Q. 1. What is the role of a catalyst in a chemical reaction ?(1 marks)
Q. 2. Which class of compounds gives a positive Fehling’s test ?( 1 marks)
Q. 3. Approximately how many stars are there in the Milky Way ? (1 marks)
Q. 4. What is meant by the statement, “Potential difference between points A and B in an electric field is 1 volt.” ?( 1 marks)
Q. 5. State the ‘Law of Chemical Equilibrium’. Write an expression for the equilibrium constant (K) for the reaction, (2 marks)
N2 (g) + 3H2(g) 2 NH3 (g) + 92 kJ
Q. 6. Name the organic acid present in vinegar. Write a chemical equation which represents the commercial method for the preparation of this acid from methanol.( 2 marks)
Q. 7. Distinguish between ‘artificial’ and ‘natural’ satellites. Why are artificial satellites called “eyes in the sky” ? (2 marks)
Q. 8. An electric lamp is marked 100 W, 220 V. It is used for 5 hours daily. Calculate
(i) its resistance while glowing.
(ii) energy consumed in kWh per day. (2 marks)
Science – 2007 (Foreign Set - 1)
SECTION -A
Q. 1. The pH values of three solutions A, B and C having equal molar concentration are respectively 2.0, 7.0 and 13.0 at 298 K. Which of the three solutions represents an acid solution ? (1 marks)
Q. 2. Write the chemical formula of simplest ketone. (1 marks)
Q. 3. Why is our galaxy called ‘Milky Way’ ? (1 marks)
Q. 4. If the distance between two electric charges is doubled, how much will the force exerting
between them change to ?( 1 marks)
Q. 5. State four characteristic features of ‘Dynamic Equilibrium’. (2 marks)
Q. 6. What is Fehling’s reagent ? What would you observe on heating formalin with Fehling’s reagent in a test tube ? (2 marks)
Q. 7. Distinguish between a ‘geosynchronous’ and a ‘polar’ satellite. What is the usual time period of a (2 marks)
(a) geosynchronous satellite ?
(b) polar satellite ?
Q. 8. An electric heater is used on 220 V supply and takes a current of 3.4 A. Calculate (i) its power and (ii) its resistance, when it is in use. (2 marks)
Download Science Question Paper -2007
- Technical Drawing Applications
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