Olympiad Test: High Order Thinking Skills (HOTs)- 5 - Class 8 MCQ

330 ms^-1

341 ms^-1

321 ms^-1

350 ms^-1

Level the crop field for uniform distribution of water

Remove the weeds manually

Sow the seeds at proper distances

Separate the grains from the chaff.

P-(v), Q-(iv), R-(ii), S-(i)

P-(ii), Q-(iv), R-(i), S-(v)

P-(iv), Q-(ii), R-(i), S-(iii)

P-(i), Q-(v), R-(iii), S-(ii)

W-Black soil, X-Alluvial soil, Y-Laterite soil, Z-Red soil

W-Alluvial soil, X-Black soil, Y-Red soil, Z-Laterite soil

W-Laterite soil, X-Black soil, Y-Red soil, Z-Alluvial soil

W-Red soil, X-Laterite soil, Y-Alluvial soil, Z-Black soil

The heat supplied to the empty paper cup was not sufficient enough to overcome its ignition temperature.

The heat was unable to reach the paper cup filled with water, hence it does not burn.

The heat supplied to the cup is transferred to water via conduction and thus, in the presence
of water, the ignition temperature of paper is not reached.

Excess of oxygen is present in the paper cup containing water, due to which water starts boiling.

(i) only

(ii), (iii) and (iv) only

(i) and (iv) only

(ii), (ii) and (iii) only

The ball will pass through it and there is no change in the shape of the ring

The ball will pass through it and the diameter of ring increases.

The ball gets stuck and the diameter of the ring decreases.

None of the above

Organism P excretes very little water in the form of urine

Organism Q undergoes hibernation in extreme conditions.

Organism R has poison glands in its skin.

Both A and B

Process II represents the conversion of ammonia into nitrates and is accomplished in two steps.

In process IV, plants absorb inorganic nitrogen compounds from the soil and convert them into organic compounds.

Process I represents the conversion of nitrates to free molecular

Process III represents nitrogen fixation by Nitrosomonas.

X is a mixture of methane, hydrogen, carbon monoxide and some other gases.

Y is a mixture of about 200 substances which can be separated by simple distillation.

 Z contains almost 98 percent carbon.

Nowadays X is used as a source of heat while earlier it was used for lighting purposes.