CREST Science Olympiad Class 8 Previous Year Papers

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Syllabus:

Section 1: Crop Production and Management, Microorganisms, Synthetic Fibres and Plastics, Metals and Non-metals, Coal and Petroleum, Combustion and Flame, Conservation of Plants and Animals, Cell, Reproduction and Endocrine System, Force and Pressure, Friction, Sound, Chemical Effects of Electric Current, Some Natural Phenomena, Light, Stars and the Solar System, Pollution of Air and Water.

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.10

Q.1	Why is just one side of the Moon visible from Earth?
	a) The Moon does not rotate on its axis as it orbits Earth.		b) The Moon rotates on its axis at the same rate that the Moon orbits the Earth.
	c) Half of the Moon is always unlit by the Sun.		d) Half of the Moon does not reflect light.

Q.2	Choose the correct option and complete the following sentence: The formation of sulphur trioxide from sulphur dioxide and oxygen is an ____________ reaction.
	a) endothermic as well as redox		b) endothermic as well as precipitation
	c) exothermic as well as redox		d) exothermic as well as precipitation

Q.3	In the given question, an assertion and reason are given. Choose the correct option: Assertion: Animals like camels walk easily in deserts as broad feet exert less pressure on sandy ground. Reason: Pressure decreases with an increase in surface area.
	a) Both assertion and reason are CORRECT and reason is the CORRECT explanation of the assertion		b) Both assertion and reason are CORRECT, but reason is NOT THE CORRECT explanation of the assertion
	c) Assertion is CORRECT, but reason is INCORRECT		d) Assertion is INCORRECT, but reason is CORRECT

Q.4	Fill in the blank: Equal force F acts on isolated bodies A and B as shown. The mass of B is three times that of A. The magnitude of the acceleration of A is ___________.
	a) three times that of B		b) 1/3 that of B
	c) nine times that of B		d) 1/9 that of B

Q.5	Consider the following statements about the physical and chemical properties of metals and choose the correct option: 1. All metals are ductile. 2. Generally metals are ductile. 3. Metals which are more reactive than hydrogen react with acids to release hydrogen gas. 4. All metals react with acids to release hydrogen gas.
	a) Only 1 and 2 are correct		b) Only 2 and 3 are correct
	c) 1, 2 and 3 correct		d) 1, 2, 3 and 4 are correct

Q.6	An elephant has a mass of 3000 kg. Each of its foot has a surface area of 0.4 m2. A lady of mass 45 kg wears stiletto shoes. Each of the stiletto heels has a surface area of 0.01 m2. Assuming there is the equal distribution of mass on each foot. Calculate the maximum possible pressure that could be exerted by a stiletto heel worn by the lady:
	a) 25500 Pa		b) 22500 Pa
	c) 52500 Pa		d) 20000 Pa

Q.7	Which of the following shows the correct sequence (in the increasing order) of heat energy received per unit area from the Sun measured on Earth, Mars and Jupiter?
	a) Jupiter > Mars > Earth		b) Earth > Mars > Jupiter
	c) Jupiter > Earth > Mars		d) Earth > Jupiter > Mars

Q.8	Different microorganisms taking part in the nitrogen cycle are: (i) Rhizobium in roots (ii) Ammonifying bacteria (iii) Nitrifying bacteria (iv) Denitrifying bacteria Which of them strictly work under anaerobic conditions?
	a) Only iv		b) i and iv
	c) i, ii and iv		d) ii and iv

Q.9	A plastic comb is rubbed with dry hair whereas a glass rod is rubbed with a piece of silk cloth. Which of these will get positively charged? A. Plastic comb B. Glass rod C. Dry hair D. Silk cloth
	a) A and B		b) B and C
	c) A and D		d) B and D

Q.10	What happens when an impure copper rod is taken as the anode and the pure copper rod is taken as the cathode in an electrolysis experiment?
	a) The pure copper cathode decreases in size and the impure copper anode increases in size.		b) The pure copper cathode increases in size and the impure copper anode decreases in size.
	c) Both the pure copper cathode and impure copper anode increases in size.		d) None of these

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Students can download the CREST Science Olympiad previous year paper pdf for class 8 from this page. Each question in the paper carries 1 mark. The answer key for all the questions is also provided on the last page.

One of the most significant advantages of solving the past years’ papers is that it helps students improve their time management skills, strengthens their understanding of concepts and aids them in applying the concepts they have mastered. Also, solving previous years’ papers a few days before the exam can help students to revise the concepts quickly. Therefore, students must refer to previous years' papers before appearing for the final exam as many advantages are associated with it.

Additional Preparation Resources

Students can also refer to the following resources to level up their CREST Science Olympiad (CSO) exam preparation for class 8 -

1. CREST Science Worksheets Package for class 8 - 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 8 - 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 8 for free.

Note: Don’t forget to download the CREST Science Olympiad past year paper pdf for class 8.