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Class 8 Exam  >  Class 8 Tests  >  Science Olympiad Class 8  >  Olympiad Test: High Order Thinking Skills (HOTs)- 2 - Class 8 MCQ

Olympiad Test: High Order Thinking Skills (HOTs)- 2 - Class 8 MCQ


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10 Questions MCQ Test Science Olympiad Class 8 - Olympiad Test: High Order Thinking Skills (HOTs)- 2

Olympiad Test: High Order Thinking Skills (HOTs)- 2 for Class 8 2024 is part of Science Olympiad Class 8 preparation. The Olympiad Test: High Order Thinking Skills (HOTs)- 2 questions and answers have been prepared according to the Class 8 exam syllabus.The Olympiad Test: High Order Thinking Skills (HOTs)- 2 MCQs are made for Class 8 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Olympiad Test: High Order Thinking Skills (HOTs)- 2 below.
Solutions of Olympiad Test: High Order Thinking Skills (HOTs)- 2 questions in English are available as part of our Science Olympiad Class 8 for Class 8 & Olympiad Test: High Order Thinking Skills (HOTs)- 2 solutions in Hindi for Science Olympiad Class 8 course. Download more important topics, notes, lectures and mock test series for Class 8 Exam by signing up for free. Attempt Olympiad Test: High Order Thinking Skills (HOTs)- 2 | 10 questions in 15 minutes | Mock test for Class 8 preparation | Free important questions MCQ to study Science Olympiad Class 8 for Class 8 Exam | Download free PDF with solutions
Olympiad Test: High Order Thinking Skills (HOTs)- 2 - Question 1
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Refer to the given figures P, Q, R and S and select the correct statement regarding them.

Detailed Solution for Olympiad Test: High Order Thinking Skills (HOTs)- 2 - Question 1

The given figures P, Q, R and S are Amoeba, Paramecium, Euglena and HIV virus respectively. Amoeba
uses pseudopodia to catch its prey. Paramecium uses cilia for locomotion and to catch its prey whereas Euglena shows mixotrophic type of nutrition, i.e., gets the nutrition through both autotrophic mode and heterotrophic mode. The HIV virus causes the dreaded disease called AIDS.

Olympiad Test: High Order Thinking Skills (HOTs)- 2 - Question 2
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The guven graph population index of three animal species in the world over a period of last 30 years. Select the correct option regarding P, Q and R.

Detailed Solution for Olympiad Test: High Order Thinking Skills (HOTs)- 2 - Question 2

According to the given graph population of P is increasing gradually, so it is a least concern species like golden
eagle. Population of Q is gradually decreasing, so it can be an endangered species like Asiatic lion. Population of R has declined completely on the 20th year so it can be an extinct species like passenger pigeon.

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Olympiad Test: High Order Thinking Skills (HOTs)- 2 - Question 3
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Select the correct match.
(i) Mohair – Angora rabbit
(ii) Merino – Vicuna
(iii) Angora wool – Angora goat
(iv) Cashmere – Kashmiri goat

Detailed Solution for Olympiad Test: High Order Thinking Skills (HOTs)- 2 - Question 3

Mohair - Angora goat
Merino - Merino sheep
Angora wool - Angora rabbit

Olympiad Test: High Order Thinking Skills (HOTs)- 2 - Question 4
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A block of mass 10 kg is suspended 10 kg through two light spring balances as
shown in figure.

Choose the correct option.
(Neglect the mass of a spring balance)
Detailed Solution for Olympiad Test: High Order Thinking Skills (HOTs)- 2 - Question 4

In both the balances, springs are stretched by 10 kg weight. Therefore, they both will show the same reading., 

Olympiad Test: High Order Thinking Skills (HOTs)- 2 - Question 5
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A few substances are grouped randomly as follows :
Group I : Nitric acid, sulphuric acid, citric acid
Group II : Ammonia, baking soda, caustic soda
Group III : Oxalic acid, tartaric acid, carbonic acid
The odd ones in groups I, II and III are respectively
Detailed Solution for Olympiad Test: High Order Thinking Skills (HOTs)- 2 - Question 5

Citric acid is a weak acid while nitric acid and sulphuric acid are strong acids.Caustic soda (NaOH) is a strong base while ammonia and baking soda are weak bases. Carbonic acid is an inorganic acid while oxalic acid and tartaric
acid are organic acids.

Olympiad Test: High Order Thinking Skills (HOTs)- 2 - Question 6
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A factory was built near a river. Factory waste containing mercury was discharged into the river. The given graph shows the amount of mercury at four different locations in the river.

Select the option that correctly identifies the area with least (P) and most (Q) number of fish.
Detailed Solution for Olympiad Test: High Order Thinking Skills (HOTs)- 2 - Question 6

According to the given graph the water at location X is most polluted and W is least polluted. The water at location
X and water at location W will have most number of fishes.

Olympiad Test: High Order Thinking Skills (HOTs)- 2 - Question 7
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Refer to the given Venn diagram and select the incorrect option.
Detailed Solution for Olympiad Test: High Order Thinking Skills (HOTs)- 2 - Question 7

According to the given Venn diagram P, Q and R could be mitochondria, chloroplast and ribosome respectively.
Mitochondria is an organelle that utilise oxygen for cellular respiration whereas chloroplast liberates oxygen during photosynthesis.

Olympiad Test: High Order Thinking Skills (HOTs)- 2 - Question 8
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Select the option that correctly identifies the incorrect match.
(i) Streptomyces – Causes malaria
(ii) Rhizobium – Bacterium responsible for curdling of milk
(iii) Penicillium – Fungus from which an antibiotic is obtained
(iv) Euglena – Nitrogen fixing bacteria
(v) Salmonella – Causes food poisoning
Detailed Solution for Olympiad Test: High Order Thinking Skills (HOTs)- 2 - Question 8

(i) Plasmodium – Causes malaria
(ii) Lactobacillus – Bacterium responsible for curdling of milk
(iii) Rhizobium – Nitrogen fixing bacteria

Olympiad Test: High Order Thinking Skills (HOTs)- 2 - Question 9
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Which of the following statements is/are correct?
I. In neutralisation reaction, heat is always given out.
II. Phenolphthalein remains colourless in a window cleaner solution.
III. Tooth decay is caused by the presence of calcium salts.
IV. To dilute an acid, we should always add water to the acid.
Detailed Solution for Olympiad Test: High Order Thinking Skills (HOTs)- 2 - Question 9

Phenolphthalein turns pink in window cleaner solution which is basic in nature.
Tooth decay is caused by the presence of acids.
To dilute an acid, we should always add acid to water as the reaction is highly exothermic.

Olympiad Test: High Order Thinking Skills (HOTs)- 2 - Question 10
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Refer to the given food web.

If a non-biodegradable insecticide known as DDT was sprayed onto the pine tree, in which of the following
organisms will most of the DDT eventually accumulate?
Detailed Solution for Olympiad Test: High Order Thinking Skills (HOTs)- 2 - Question 10

In the given food web, snake is the top consumer for the food chain involving pine tree. Bioaccumulation of DDT, a non-biodegradable compound sprayed onto the pine tree occurs in the pine borers and all subsequent consumers in these food chains. By bioaccumulation, levels of DDT will accumulate to the greatest extent in the top consumer, which is the snake.

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