National Science Olympiad Forum By SOF Olympiad Trainer

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 4
D because the others have protein in them

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 6
Answer: D Asthma (P) is a chronic disease characterised by inflammation in airways making it difficult to breathe. It is a noncommunicable disease which can be triggered by air borne allergens, respiratory infections, etc. Scurvy (Q) or bleeding gums is caused by deficiency of Vitamin C. Dengue (R) is a viral disease that is communicable as it spreads from an infected person to healthy person through bite of mosquito. Cholera (s) is also a communicable disease that spreads through contaminated food and water.

Ans 2: (Master Answer)

Class : Class 1
Answer: D Asthma (P) is a chronic disease characterised by inflammation in airways making it difficult to breathe. It is a noncommunicable disease which can be triggered by air borne allergens, respiratory infections, etc. Scurvy (Q) or bleeding gums is caused by deficiency of Vitamin C. Dengue (R) is a viral disease that is communicable as it spreads from an infected person to healthy person through bite of mosquito. Cholera (s) is also a communicable disease that spreads through contaminated food and water.

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 6
Answer: B. A beetle has four stages in its life cycle - egg, larva, pupa and adult. The young one that hatches from egg is completely different from adult. It experiences complete metamorphosis and undergoes moulting several times to become an adult.

Ans 2: (Master Answer)

Class : Class 1
Answer: B A beetle has four stages in its life cycle-egg, larva, pupa and adult. The young one that hatches from egg is completely different from adult. It experiences complete metamorphosis and undergoes moulting several times to become an adult.

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Subject :NSO    Class : Class 5

Ans 1: (Master Answer)

Class : Class 1
Answer: B In the given setup, the plastic ball that is held at the greatest height from ground will possess maximum potential energy and vice versa. Hence ball Q will have highest potential energy and ball S will have the lowest potential energy.

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Subject :NSO    Class : Class 5

Ans 1: (Master Answer)

Class : Class 1
Iron is present in huge amount in earth crust where it occurs in the combined state with other elements. Chief ores of iron are magnetite, hematite etc. Iron is extracted from these ores through a complicated process. Petroleum is fossil fuel that formed when large quantities of dead organisms were buried underneath sedimentary rocks and subjected to both intense heat and pressure. It is yellow to black liquid found in geological formations beneath the earth's surface.

Ans 2: (Master Answer)

Class : Class 1
Answer : B Iron is present in huge amount in earth crust where it occurs in the combined state with other elements. Chief ores of iron are magnetite, hematite etc. Iron is extracted from these ores through a complicated process. Petroleum is fossil fuel that formed when large quantities of dead organisms were buried underneath sedimentary rocks and subjected to both intense heat and pressure. It is yellow to black liquid found in geological formations beneath the earth's surface.

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Subject :NSO    Class : Class 5

The amount of carbon dioxide in the air in an area was seen to change over a period of time as shown in the graph here.


Select the most suitable option regarding this.

AA factory has been established in that area at time S.
BDeforestation has been done in that area at time Q.
CA new forest has been established there at point P.
DLarge number of vehicles run by fossil fuels have been introduced in that area at point R.


Ans 1: (Master Answer)

Class : Class 1
The given graph shows that amount of CO2 increases from time Q to R. The increase in CO2 amount during interval Q – R is indicative of activities like deforestation, burning of fossil fuel, increase in vehicular transport etc.

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Subject :NSO    Class : Class 6

Observe the given Venn diagram carefully and fill in the blanks by choosing an appropriate option.

1 2 3 4
A Falling of
trees
Occurrence of
rainbow
Growth of
plants
Tearing paper
into pieces
B Knitting sweater
from wool
Setting of milk
to form curd
Making rice
puddings
Dissolving sugar
in water
C Expansion of mercury
in thermometer
Breaking of
glass
Lighting LPG
stove
Boiling an
egg
D Filling a water
bottle
Melting of
ice
Burning of
paper
Boiling of
water


Ans 1: (Master Answer)

Class : Class 1
Answer: C 1 : Expansion of mercury in thermometer is a physical change which is reversible as mercury returns to its original position (contracts) on cooling. 2 : Breaking of glass is a physical change which is irreversible as broken pieces of glass cannot be joined back. 3 : Lighting LPG stove involves both physical and chemical changes. When LPG comes out of the cylinder it changes from liquid to gaseous state which is a physical change. Then the gas burns in the air which is a chemical change. 4. Boiling of an egg is a chemical change, liquid egg converts to solid egg having different texture and taste which is irreversible as boiled egg cannot be changed into original liquid form.

Ans 2:

Class : Class 7
c

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Subject :NSO    Class : Class 6

Ans 1: (Master Answer)

Class : Class 1
Answer: D The circuit will not be completed when one of the four bulbs blows off. Hence, all the bulbs P, Q, R and S will not glow

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Subject :NSO    Class : Class 6

A scientist conducted a study on four different species of organisms (W, X, Y and Z) that are related in an aquatic food chain. He estimated the total number of individuals in the population of each species and the average biomass of each individual.


Which of the following shows the correct relation of these species in a food chain?

AZ → Y → W → X
BX → W → Z → Y
CX → W → Y → Z
DZ → W → X → Y


Ans 1: (Master Answer)

Class : Class 1
Answer: A Biomass is the amount of living organic matter. In aquatic food chain, biomass keeps increasing from producer to top consumer i.e., Producer < Primary consumer < Secondary consumer < Tertiary consumer. In aquatic food chain however the number of individuals at each trophic level goes on decreasing from producer to top consumer, i.e., Producer > Primary consumer > Secondary consumer > Tertiary consumer. So, the correct relation of tabulated species in a food chain should be Z (Producer) → Y (Primary consumer) → W (Secondary consumer) → X (Tertiary consumer).

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5
C

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