National Science Olympiad Forum By SOF Olympiad Trainer

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Subject :NSO    Class : Class 3

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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 7

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Class : Class 7

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Class : Class 7

Ans 3:

Class : Class 7
Answer is B

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 6

Mark the incorrect statement.

A Melting of wax is a physical change while burning of wax in a candle is a chemical change.
B Metals expand on heating while contract on cooling. Both are physical changes.
C Composition of matter changes during a chemical change while it remains same during a physical change.
D High and low tides in sea are the examples of non-periodic changes while growth of a tree is a periodic change.


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Class : Class 6
Option d is correct

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Class : Class 7
Option D is incorrect

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8
Option C

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Class : Class 8
Option C

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Subject :NSO    Class : Class 7

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Class : Class 7

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Class : Class 7
What is meant by the term 'AMMONOTELISM, UREOTELISM, URICOTELISM'?

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Subject :NSO    Class : Class 7

Farheen soaked some bean seeds in water overnight. Next morning she drained the water and kept the seeds moist till they started germinating. She boiled half of the seeds and then kept the germinating seeds in one thermos flask (X) and the boiled seeds in another thermos flask (Y). She covered the mouths of both flasks with moist cotton wool. Then she inserted thermometers in both flasks and kept the flasks as shown in the figure.


What would be her observation?

A Temperature of flask X increases because it has photosynthesising seeds.
B Temperature of flask X increases because it has respiring seeds.
C Temperature of flask Y increases because it has boiled seeds.
D Both (B) and (C)


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