Elements of Science Past Paper PDF

Okay, here is the converted markdown format. # K-202631-C **Subject: Elements of Science** * **Total No. of Questions**: 21 * **Total No. of Printed Pages**: 7 * **Time:** 3 hours * **Maximum Marks:** 75 **Instructions:** * Attempt all questions. * Internal choices are given in Ques...

Okay, here is the converted markdown format. # K-202631-C **Subject: Elements of Science** * **Total No. of Questions**: 21 * **Total No. of Printed Pages**: 7 * **Time:** 3 hours * **Maximum Marks:** 75 **Instructions:** * Attempt all questions. * Internal choices are given in Question Nos. 18 to 21. * Draw a diagram if necessary in the answer. **Instructions:** *Question No. 1 is an objective type question. It contains three parts-Part (A), Part (B) and Part (C). In Part (A) Multiple choice questions, in Part (B) Fill in the blanks and in Part (C) Make the right pairs are given. Each part has 5 questions and each question carries 1 mark.* ## Question 1 **(Part-A) Choose and write the correct option:** **(i) How much velocity of light is in vacuum**? a) $3 \times 10^8$ m/s b) $3 \times 10^8$ s/m c) $3 \times 10^6$ m/s d) $6 \times 10^9$ m/s **(ii) An independently hanging magnet always rests in:** a) North-East b) North-South c) North-West d) None of these **(iii) How many watts are there in one horse power?** a) 746 watts b) 7460 watts c) 74600 watts d) 764 watts **(iv) Cloud is an example of this colloidal system:** a) Emulsion b) Sol c) Aerosol d) Gel **(v) When the rate of reaction increases in the presence of catalyst, it is called:** a) Auto-catalysis b) Positive catalysis c) Induced catalysis d) Negative catalysis **(Part-B) Fill in the blanks:** **(i)** There are \_\_\_\_ laws of reflection. **(ii)** There is \_\_\_\_ in opposite poles of magnet. **(iii)** \_\_\_\_ is used in electric bell. **(iv)** The substance, which affects the speed of chemical reaction, is called \_\_\_\_ **(v)** The botanical name of onion is \_\_\_\_. **(Part-C) Match the right pairs:** | | A | | B | | :--- | :--------------------- | :---- | :------------------------------ | | (i) | Good conductor | (a) | *Mycobacterium tuberculosis* | | (ii) | Tuberculosis | (b) | Mitochondria | | (iii)| Ammonium chloride | (c) | 673 kcal energy | | (iv) | Aerobic respiration | (d) | Nausadar | | (v) | Krebs cycle | (e) | Copper | **Instructions:** *(B) Question Nos. 2 to 9 are very short answer type questions. Each question carries 2 marks. (Maximum word-limit of answer is 30 words)* **Question 2** When does the rainbow appear? What is the reason for it? [1+1=2] **Question 3** What are good conductor and bad conductor? [1+1=2] **Question 4** How is solenoid made? [2] **Question 5** Write the trade name and formula of sodium bicarbonate. [1+1=2] **Question 6** What does pH mean? [2] **Question 7** What is called Macro-nutrient? [2] **Question 8** What is called Anaerobic Respiration? [2] **Question 9** What is called nitrifying bacteria? [2] **Instructions:** *(C) Question Nos. 10 to 17 are very short answer type questions. Each question carries 3 marks. (Maximum word-limit of answer is 50 words)* **Question 10** How and when does the lunar eclipse occur? Draw only its line diagram. [1+2=3] **Question 11** What is called Electrolysis? Draw labelled diagram of silver voltmeter. [1+2=3] **Question 12** Write any three differences between Lyophilic and Lyophobic Colloids. [1+1+1=3] **Question 13** Find the normality of solution when 2 grams NaOH is dissolved in 250 ml solution (equivalent weight of NaOH = 40). [3] **Question 14** Write short notes on the following: [1/2+1/2=3] (i) Catalytic poison (ii) Catalytic promoter **Question 15** Write the chemical formulas with any two uses of blue vitriol and green vitriol. [1/2+1/2=3] **Question 16** Write any three aims of growing kitchen garden. [1+1+1=3] **Question 17** Write economical importance of Cruciferae family (any three). [1+1+1=3] **Instructions:** *(D) Question Nos. 18 to 21 are long answer type questions. Each question carries 5 marks. (Maximum word-limit of answer is 150 words)* **Question 18** Write about the five tillage-related implements with diagram. [1+1+1+1+1=5] **OR** Explain the system of planting with diagram (any five). **Question 19** Explain with diagram the reproduction by binary fission in bacteria. [2+3=5] **OR** Explain cell wall with a labelled diagram of bacterial cell. **Question 20** Describe transpiration process by bel-jar experiment with diagram. [2+3=5] **OR** Write the definition of photosynthesis and its any three importances. **Question 21** Explain dispersion of light through prism with diagram. [2½+2½=5] **OR** State the structure of simple microscope and explain the image formed by it with diagram.