Subject :NSO Class : Class 3
Subject :NSO Class : Class 5
Ans 1: (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.
Ans 2:
Class : Class 10
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 10
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
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Subject :NSO Class : Class 5
Ans 2: (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 3: (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
Ans 1:
Class : Class 5
The given graph shows that amount of CO2 increases from time Q to R The increases in CO2 amount during interval Q R is indicative of activities like deforastation burning of fossil fuels increases 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.
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Subject :NSO Class : Class 6
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Subject :NSO Class : Class 5
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Subject :NSO Class : Class 5