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CBSE Class 10 Board Exam 2024 : Science

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PERIODICTEST II (Half Yearly Examination) GRADE-X SUB: Science TIME - 3 HOUR. MAX MARKS 80 General Instructions: i. This question paper consists of 39 questions in 5 sections. questions. Astudent is expected to attempt ii. Allquestions are compulsory. However, an internal choice is provided in some only one of these questions. iii. Section Aconsists of 20objective type questions carrying I mark each. questions should in the range of30 iv. Section B consists of 6 Very Short questions carrying 02 narks each. Answers to these to 50 words. Answers to these questions should in the range v. Section C consists of 7 Slhort Answer type questions carrying 03 marks each. of50 to 80 words each. Answer to thesequestions sho:ld be in the vi. SeciionD consists of 3Long Answer type questions carrying 05 marks range of 80to 120 words. with sub-parts. vii. Section E consists of3 source-based/case-based units of assessnment of 04 marks each 1x20 Section A for each of the questions Select and write one most appropriate option out of the four options given 1-20 formation of a rainbow? 1. Which of the following phenomena of light are involved in the a. Reflection, refraction and dispersion b. Refraction, dispersion and total internal reflection c. Refraction, dispersion and internal reflection d. Dispersion, scattering and total internal reflection 2. The clear sky appears blue because a. Blue light gets absorbed in the atmosphere. b. Ultraviolet radiations are absorbed in the atmosphere. the atmosphere. ,c. Violet and blue lights get scattered more than lights of all other colours by lights by the atmosphere. d. Light of all other colours is scattered more than the violet and blue colour occurs at the 3. When light rays enter the eye, most of the refraction c. Iris a.Crystalline lens d. Pupil b. Outer surface of the cornea 4. The focal length of the eye lens increases when eye muscles a. Are relaxed and lens becomes thinner b.Contract and lens becomes thicker c. Are relaxed and iens becomes thicker d. Contract and lens becomes thinner 5. Focal length of aplane mirror is c. 25cm a. 0 d. -25 cm b. Infinite 6. Image formed by a convex spherical mirror is: a. Virtual c. Enlarged b. Real d. Inverted 7. Which of the following statements about the given reaction are correct ? 3Fe(s) +4H20(g) >Fes0+(s) +4H2(g) ) Iron metal is getting oxidised (ii) Water is acting as reducing agent a. (i), (ii) and (ii) " c. (i), (ii) and (iv) i ) Water is getting reduced fiv) Water is acting as oxidising agent b. (ii) and (iv) d. (ii) and (iv).

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