Olympiad Test: High Order Thinking Skills (HOTs)- 5 - Class 8 MCQ
10 Questions MCQ Test - Olympiad Test: High Order Thinking Skills (HOTs)- 5
Refer to the given paragraph and answer the following questions.
Nitin suggested calculating the speed of sound using the following setup. He stands at 400 m from a large wall and fires the starting pistol. Another student next to him starts the stopwatch when she hears the starting pistol and stops the stopwatch when she hears the echo. The reading she has taken after Nitin conducted the experiment three times are 2.42s, 2.53s and 2.52s.
In accordance with the experiment, calculate the average speed of sound.
Nitin suggested calculating the speed of sound using the following setup. He stands at 400 m from a large wall and fires the starting pistol. Another student next to him starts the stopwatch when she hears the starting pistol and stops the stopwatch when she hears the echo. The reading she has taken after Nitin conducted the experiment three times are 2.42s, 2.53s and 2.52s.
In accordance with the experiment, calculate the average speed of sound.
Identify the agricultural implement shown in the given figure and select the correct statement regarding it.
The given agricultural implement is used to
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Match column I with column II and select the correct option from the given codes.
Column I Column II
P. Coal (i) Petroleum refining
Q. Coke (ii) Destructive distillation of coal
R. Bitumen (iii) Liquefied form of dead organic matter
S. Crude oil (iv) Carbonisation
(v) Black gold
Column I Column II
P. Coal (i) Petroleum refining
Q. Coke (ii) Destructive distillation of coal
R. Bitumen (iii) Liquefied form of dead organic matter
S. Crude oil (iv) Carbonisation
(v) Black gold
Refer to the given classification chart and select the option that correctly identifies W, X, Y and Z.
Ankit made two paper cups bu folding a sheet of paper. He filled water in one of the cups and kept the other cup empty. He placed each of the paper cups over two burning cadles as shown in the following figure.
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He observed that the empty cup starts burning immediately, but the cup containing water does not
burn. Rather, the water in the cup starts boiling when continued to heat for some more time.
What could be the most appropriate reason for this?
In the given figure, different zones of a candle flame are marked by the letters P, Q, R and S.
Which of the following statements is/are incorrect?
(i) P is the luminous zone and is the hottest part of candle flame.
(ii) In zone Q, there is inadequate supply of oxygen.
(iii) Zone R contains unburnt wax vapours produced by melting of wax.
(iv) In zone S, carbon monoxide burns with a yellow flame.
Consider the figures of a metal ball and a metal ring given here.
The metal ball can just pass through the metal ring.
If the metal ring is heated, then
Read the given paragraph.
Organism P has leathery lips and a big hump on its back, organism Q has thick layer of subcutaneous fat and a dense fur covering on its body whereas organism R is brightly coloured and has long, large and colourful beak.
Which of the following does not hold true for organisms P, Q and R?
Refer to the given nitrogen cycle occurring in nature.
Identify processes I-IV and select the correct statement regarding them.
A brief information about substances X, Y and Z is given here.
X : A gaseous fuel obtained by the strong heating of coal in the absence of air.
Y : A thick black liquid having an unpleasant smell obtained by heating coal in the absence of air.
Z : A tough and porous black solid prepared by heating coal in the absence of air.
Which of the following statements is incorrect about X, Y and Z?
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