CREST Science Olympiad Class 10 Previous Year Papers

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Syllabus:

Section 1: Chemical Reactions and Equations, Acids, Bases and Salts, Metals and Non-metals, Carbon and its Compounds, Periodic Classification of Elements, Life Processes, Reproduction in Organisms, Heredity and Evolution, Light-Reflection and Refraction, Human Eye and Colourful World, Electricity, Magnetic Effects of Electric Current, Sources of Energy, Our Environment and its Management.

Achievers Section: Higher Order Thinking Questions - Syllabus as per Section 1

Sample Paper Previous Year Paper Marking Scheme Free Study Material

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Q.5

Q.6

Q.7

Q.8

Q.9

Q.10

Q.1	Match List I (Vegetative propagation type) with List II (Example): Column I (Vegetative propagation type) Column II (Example) 1.     Tuber eye a.     Garlic 2.     Bulb b.     Rose 3.     Cutting c.      Potato 4.     Plantlets at margins of leaves d.     Bryophyllum
	a) 1 – c, 2 – a, 3 – d, 4 – b		b) 1 – c, 2 – a, 3 – b, 4 – d
	c) 1 – a, 2 – b, 3 – d, 4 – c		d) 1 – b, 2 – d, 3 – c, 4 – a

Q.2	Which of the following equations is the summary of photosynthesis?
	a) 6CO2 + 12H2O → C6H12O6 + 6O2 + 6H2O		b) 6CO2 + H2O + Sunlight → C6H12O6 + O2 + 6H2O
	c) 6CO2 + 12H2O + Chlorophyll + Sunlight → C6H12O6 + 6O2 + 6H2O		d) 6CO2 + 12H2O + Chlorophyll → C6H12O6 + 6CO2 + 6H2O

Q.3	Consider the following reaction: 2CaO + C → CaC2 + 2CO 2CaC2 + 2H2O → X + Y If X is involved in the neutralisation reaction with acid, then Y may be:
	a) CH4		b) C2H2
	c) Ca(OH)2		d) CaH2

Q.4	Match column I with column II and select the correct answer using the codes given below:   Column I   Column II 1.     Element with a smallest atomic radius a.     Ca 2.     Element with the largest atomic radius b.     F 3.     Element with the highest electron affinity c.     Cl
	a) 1 – c, 2 – b, 3 – a		b) 1 – b, 2 – a, 3 – c
	c) 1 – a, 2 – b, 3 – c		d) 1 – a, 2 – c, 3 – b

Q.5	Which of the statements given below are correct? I. Ohm's law is not applicable at very low and very high temperature. II. Ohm's law is applicable to the semiconductor. III. Ohm's law is not applicable to electron tubes, discharge tubes and electrolytes. IV. If a 24-volt battery is connected to a 6-ohm resistor, the current passing through the resistor is 4 A.
	a) I, II and III		b) I, II and IV
	c) I, III and IV		d) I, II, III and IV

Q.6	When current flows in a long straight solenoid, north and south poles are created at the two ends. Which of the following statements is/are correct?
	a) The field lines inside the solenoid are in the form of straight lines which indicate that the magnetic field is the same at all points inside the solenoid.		b) The strong magnetic field produced inside the solenoid can be used to magnetise a piece of magnetic material like soft iron when placed inside the coil.
	c) The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet.		d) Both a and b

Q.7	When SO2 is passed through a solution of K2Cr2O7 turns green. Which of the following correctly shows the change in the oxidation state of chromium and sulphur?
	a) +3 to +6 and +4 to +2 respectively		b) +6 to +3 and +4 to +6 respectively
	c) +4 to +6 and +4 to -2 respectively		d) No change in 0 states

Q.8	Identify the reaction which takes place at the anode when an aqueous solution of CuSO4 is electrolysed using platinum as anode:
	a) Hydroxyl ions get reduced to hydrogen.		b) Hydroxyl ions get oxidised to oxygen.
	c) Copper metal gets oxidised.		d) Copper ions gets reduced.

Q.9	It is possible to measure the passage of 50 electrons per sec with a certain sensitive device. This corresponds to a current of:
	a) 8 x 10-18 A		b) 1.6 x 10-20 A
	c) 8 x 10-20 A		d) 1.6 x 10-19 A

Q.10	Which of the following statements is correct regarding the grafting process?
	a) The rooted plant that is cut in a slanting manner is known as a scion.		b) The part of a stem that is cut in a slanting way is called stock.
	c) This is a natural method of vegetative reproduction.		d) Grafting is practised for mango and citrus plants.

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Students can find the most recent CREST Science Olympiad previous year paper pdf for class 10 on this page. The pdf is easily downloadable & answer key for all the questions is also provided on the last page.

CREST Science Olympiad previous year papers become quite useful while preparing for the CREST Science Olympiad exam. Below are some advantages of referring to the previous year papers -

1. Students get to understand the types of questions that come in the CREST Science Olympiad exam.
2. Practicing previous years’ papers help students to get to know their strengths and weaknesses.
3. Students become capable of effectively managing their time in the exam by practicing previous years' papers multiple times.

Additional Preparation Resources

Students can also refer to the following resources to level up their CREST Science Olympiad (CSO) exam preparation for class 10 -

1. CREST Science Worksheets Package for class 10 - It is a package of 5 worksheets. The worksheets are in the same pattern as the previous year paper. Hence, very useful for preparation. Existing users can purchase additional practice worksheets by following these steps: Login at https://www.crestolympiads.com/login -> Dashboard -> Additional Practice -> Buy & new users can visit https://www.crestolympiads.com/registration
2. CREST Science Olympiad book for class 10 - The book covers topic-wise reading material, chapter-wise practice questions with answer key & contains the previous year paper. The book is available in both physical and pdf formats. Proceed now to purchase the Olympiad book. Also, students can view & download the first chapter of the Science Olympiad book for class 10 for free.

Note: Don’t forget to download the CREST Science Olympiad past year paper pdf for class 10.