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CBSE Class 8  >  Class 8 Test  >  Science Olympiad   >  Olympiad Test: High Order Thinking Skills (HOTs)- 3 - Class 8 MCQ

Olympiad Test: High Order Thinking Skills (HOTs)- 3 - Free MCQ with solutions


MCQ Practice Test & Solutions: Olympiad Test: High Order Thinking Skills (HOTs)- 3 (10 Questions)

You can prepare effectively for Class 8 Science Olympiad Class 8 with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Olympiad Test: High Order Thinking Skills (HOTs)- 3". These 10 questions have been designed by the experts with the latest curriculum of Class 8 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 15 minutes
  • - Number of Questions: 10

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Olympiad Test: High Order Thinking Skills (HOTs)- 3 - Question 1
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The bob of a pendulum is released from point P and it comes to rest at point Q as shown in the given figure. The time taken by the bob to move from point P to point Q is 0.8 seconds. The time taken by the same bob to make 14 oscillations is

Detailed Solution: Question 1

Time period of the pendulum = Time taken in one complete cycle (P → Q → P) = 0.8 + 0.8 = 1.6 s. Time taken to make 14 oscillations = 14 × 1.6 = 22.4 s

Olympiad Test: High Order Thinking Skills (HOTs)- 3 - Question 2
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The given figure shows a circuit in which all the switches are open.
Which one of the following switch positions will give an effective resistance of 3.0 Ω between P and Q?


S1          S2           S3

Detailed Solution: Question 2

In option A, effective resistance = 1 Ω, as both 2 Ω resistances are in parallel. In option B, effective resistance = 2 Ω, as switches S1 and S2 are open. In option C, effective resistance = 1 Ω + 1 Ω = 2 Ω. In option D, effective resistance = 1 Ω + 2 Ω = 3 Ω, as both resistances 1 Ω and 2 Ω are in series.

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Olympiad Test: High Order Thinking Skills (HOTs)- 3 - Question 3
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A pendulum makes 30 complete oscillations in 15 seconds. If another pendulum Y makes 19 complete oscillations in 9 seconds, then select the incorrect statement(s).
(i) The string of pendulum Y is longer than that of pendulum X.
(ii) The angle of swing of release of pendulum changes its time period.
(iii) Pendulum Y has a shorter period than pendulum X.
(iv) The higher mass of the bob of the pendulum corresponds to its lower time period.

Detailed Solution: Question 3

Time period of pendulum X = 15/30 = 0.5 sec. Time period of pendulum Y = 9/19 = 0.47 sec.

Olympiad Test: High Order Thinking Skills (HOTs)- 3 - Question 4
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Which of the following statements are correct?
I. Non-renewable resources are those which once used up cannot be replaced within a reasonable period of time.
II. Coal and natural gas are inexhaustible natural resources.
III. CNG is more polluting than petrol.
IV. The high temperature and high pressure inside the earth slowly converts the buried vegetation into coal.

Detailed Solution: Question 4

Coal and natural gas are exhaustible natural resources. CNG is less polluting than petrol as it does not produce many harmful gases. I and IV are correct statements.

Olympiad Test: High Order Thinking Skills (HOTs)- 3 - Question 5
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Observe the given figures carefully.


Read the given statements and select the correct one(s).
(1) Figure (I) represents the zone of highest temperature.
(2) Figure (III) represents the middle zone of incomplete combustion.
(3) Figure (II) represents the luminous zone of unburnt carbon particles.
(4) In figure (II), a circular dark ring is formed on the slide due to the rise of unburnt wax vapours.

Detailed Solution: Question 5

Temperature is highest in the outermost zone of the candle flame, i.e., figure I. Middle zone of the candle flame has unburnt carbon particles, thus a circular dark ring is formed on the slide by the deposition of unburnt carbon particles present in this zone of the candle flame (figure II). The dark zone is the zone near the wick of the candle. The (innermost) dark zone (figure III) consists of unburnt wax vapours. In figure III, these vapours rise up the glass tube and burst into flame when a lighted matchstick is brought near them. Thus, figure I represents the outermost zone or non-luminous zone. Figure II represents the luminous zone of unburnt carbon particles or middle zone of incomplete combustion. Figure III represents the innermost or dark zone of the candle flame.

Olympiad Test: High Order Thinking Skills (HOTs)- 3 - Question 6
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Match column I with column II and select the correct option from the given codes.
Column I Column II
P. Innermost zone of flame (i) Rapid combustion
Q. Rusting of iron (ii) No combustion
R. Burning of LPG (iii) Complete combustion
S. Non-luminous zone of flame (iv) Slow combustion

Detailed Solution: Question 6

Innermost zone of flame – No combustion (P–ii). Rusting of iron – Slow combustion (Q–iv). Burning of LPG – Rapid combustion (R–i). Non-luminous zone – Complete combustion (S–iii).

Olympiad Test: High Order Thinking Skills (HOTs)- 3 - Question 7
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Identify the method of irrigation shown in the given figure and select the correct statement regarding it.

Detailed Solution: Question 7

The method of irrigation shown in the given figure is 'rahat'. It is a traditional method of irrigation that is based on the lever system. Drip irrigation is a modern method that delivers water drop by drop at the base of each plant and is used in places where there is a shortage of water.

Olympiad Test: High Order Thinking Skills (HOTs)- 3 - Question 8
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Read the given statements and select the option that correctly identifies them as true (T) and false (F) ones.
(i) Like charges attract each other.
(ii) A charged glass rod attracts a charged plastic straw.
(iii) Lightning conductor cannot protect a building from lightning.
(iv) Earthquakes can be accurately predicted in advance.
(i) (ii) (iii) (iv)

Detailed Solution: Question 8

Like charges repel while unlike charges attract each other. A charged glass rod has a positive charge on its surface, whereas a charged plastic straw has a negative charge on its surface, resulting in attraction. Lightning conductors are used at the top of buildings to pass electric charges to the ground to save the building. Earthquake risk areas can be identified, but accurate prediction in advance is very difficult and rare.

Olympiad Test: High Order Thinking Skills (HOTs)- 3 - Question 9
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A brief description about four substances is given below:
W : A liquid fuel that is used in jet aircrafts.
X : A thick, black liquid from which naphthalene balls are obtained.
Y : A cleaner fuel used for power generation.
Z : A petroleum product that is used for surfacing of roads.
W, X, Y and Z are respectively.

Detailed Solution: Question 9

Kerosene (W) is used as a fuel in jet aircrafts. Coal tar (X) is a thick, black liquid which is used to obtain several compounds including naphthalene balls. CNG (Y) is a cleaner fuel as it does not cause any pollution and is used for power generation. Bitumen (Z) is used for road surfacing nowadays.

Olympiad Test: High Order Thinking Skills (HOTs)- 3 - Question 10
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Refer to the given classification chart and select the option that correctly identifies P-S.

Detailed Solution: Question 10

P- Passenger pigeon, Q - Lion-tailed macaque, R - Bornean orangutan, S - Eastern black rhino

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About this Class 8 Practice Test

This test contains 10 MCQs on Olympiad Test: High Order Thinking Skills (HOTs)- 3 with detailed solutions for each question. It is part of the Science Olympiad Class 8 course on EduRev, designed to align with the current Class 8 syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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