National Science Olympiad Forum By SOF Olympiad Trainer

Varad More from Saint Joseph School , Barshi, Solapur

Subject :NSO Class : Class 10

Transpiration has been described as a 'necessary evil' because it is inevitable, but potentially harmful. Which of the following statements describe this?
(i) It causes absorption of mineral salts.
(ii) It regulates plant temperature.
(iii) It causes wilting and injury in plants.
(iv) It causes ascent of sap.

A (i) and (iv) only
B (i), (ii) and (iii) only
C (i), (ii) and (iv) only
D (i), (ii), (iii) and (iv)

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Pragyan Padhi from Delhi Public School Nacharam, Hyderabad

Subject :NSO Class : Class 5

Study the above given food web. Which of the following graphs shows how populations of S, T and U are likely to be affected if there is a mass migration of V out of the habitat?

A

B

C

D

A

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Pragyan Padhi from Delhi Public School Nacharam, Hyderabad

Class : Class 6

A

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Gaurish Singla from DPS School Sector 19, Faridabad

Subject :NSO Class : Class 8

A car travelling normally towards a cliff at a speed of 50 m s^–1, sounds its horn when it is 0.7 km away. Taking the speed of sound to be 300 m s^–1 in air, find the time taken for the driver to hear its echo.

A 0.04 s
B 4.0 s
C 4.7 s
D 28.0 s

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ABDUL Rahman SIDDIQUI from Indian school al maabela , muscat

Class : Class 9

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ANAY VAISH from DPS UDAIPUR, UDAIPUR

Subject :NSO Class : Class 6

Unscramble the given options and select the option that gives the term used for the process of separating cotton fibres from seeds.

A EVNGWAI
B NIGGINN
C SNGIERAH
D NTINKITG

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Mridul Vashisht from St. Kabir Public School, Chandigarh

Subject :NSO Class : Class 8

The given diagram represents a village. The waste material from residential area and factories is dumped into the river stream that passes through the village. Which line in the graph correctly shows the change in the population of aquatic fish when they swim downstream from points P to Q?

A I
B II
C III
D IV

Will the population not increase where the cropland is?

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ALICE from Delhi Public School, UDAIPUR

Subject :NSO Class : Class 7

Raj is son of Rani and father of Sahil. If Meena is the mother of Sahil, then how is Meena related to Rani?

ADaughter
BMother
CDaughter-in-law
DSister

Wrong

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ALICE from Delhi Public School, UDAIPUR

Class : Class 9

Wrong

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Soham from Vibgyor high, Pune

Subject :NSO Class : Class 8

In which of the following media can sound travel through?
(i) Glass of water
(ii) Balloon full of air
(iii) Iron bar
(iv) Vacuum

A (i) and (ii)
B (i) and (iii)
C (i), (ii) and (iii)
D All of these

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Tejas Agarwal from Prudence School , New Delhi

Class : Class 9

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ALICE from Delhi Public School, UDAIPUR

Subject :NSO Class : Class 7

Study the given relationship and select the option which correctly identifies the same relationship.

ALinen : Cotton silk : Rayon
BCotton silk : Polyester : Pashmina
CNylon : Linen : Angora
DShahtoosh : Angora : Linen

C

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ALICE from Delhi Public School, UDAIPUR

Class : Class 9

C

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Venkatesan Ekambaram from NCFE, Bengaluru

Subject :NSO Class : Class 9

Which of the following options is correct?
(i) Force of gravitation on a body is equal to the true weight of the body.
(ii) A person standing in an elevator moving downwards with constant acceleration finds his weight less than actual.

A Only (i) is correct.
B Only (ii) is correct.
C Both (i) and (ii) are correct.
D Neither (i) nor (ii) is correct.

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Soham from Vibgyor high, Pune

Subject :NSO Class : Class 8

Thyroxine controls ______ in frogs and the development of _____during embryonic development of other vertebrates. Thyroxine production requires the presence of ______ in diet.
Select the correct sequence of words to complete the above passage.

A Development, Circulatory system, Iodine
B Metamorphosis, Circulatory system, Calcium
C Development, Nervous system, Iron
D Metamorphosis, Nervous system, Iodine

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