National Science Olympiad Forum By SOF Olympiad Trainer - Page 776
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ankitadasgupta from dps, Bengaluru
Subject :NSO    Class : Class 7

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
The correct answer is B.

Ans 2:

Kavyam Agrawal from Delhi Public School Nerul, Navi Mumbai
Class : Class 7

Ans 3:

Keratin from Chrysalis High, Bangalore
Class : Class 8
The correct answer is B. In 4sec the objet increases its speed to 200m/s . Acceleration=(200-0)÷4 = 50m/s^2. S=ut 1/2×at^2. Solve it you'll get 400m. a=acceleration(50), t=time(4), u=initial velocity(0) and s is displacement(consider it distance travelled)

Ans 4:

Arnav Ranka from Gyan Bharati School, Saket, New Delhi
Class : Class 9
How is it 200m? I am getting 800m.

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KADALI VAMSIKRISHNA from BVM GLOBAL AT BOLLINENI HILLSIDE, Chennai
Subject :NSO    Class : Class 5

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Pratyush Chandra from Bal Bhavan Public School, New Delhi
Subject :NSO    Class : Class 8

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Anjisnu Raha from SBOA School and Junior College, Chennai
Class : Class 9
sea weed and bird only are in line with the laser. we can see only these.

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Preetha Joshi from ,
Subject :NSO    Class : Class 8

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Dr Anupa Ghosh from ,
Class : Class 8
Coal is a fuel with high carbon content derived from destructive distillation of coal.

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Preetha Joshi from ,
Subject :NSO    Class : Class 8

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prabhkhelSingh from Hra international school, Gurdaspur
Class : Class 6
correct answer is D because in the reactivity series,copper lies below hydrogen which means that hydrogen cannot be displaced by copper from its salt solution.

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Dr Anupa Ghosh from ,
Class : Class 8
The correct option is D. Because if you see the reactivity table copper is placed below hydrogen.So it is not more reactive than hydrogen and cannot replace it from its compound.

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Pramath Ram from Canara CBSE, Mangalore
Subject :NSO    Class : Class 7

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
The correct answer is A.

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Pramath Ram from Canara CBSE, Mangalore
Subject :NSO    Class : Class 7

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y rahaav karthikeyan from the indian public school, TIRUCHENGODE
Subject :NSO    Class : Class 5

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y rahaav karthikeyan from the indian public school, TIRUCHENGODE
Subject :NSO    Class : Class 5

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Preetha Joshi from ,
Subject :NSO    Class : Class 8

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Dr Anupa Ghosh from ,
Class : Class 8
The use of electroplating is more widely seen in industries than electrolysis. Actually,decomposition of water is not so much required in industries than plating of metals.

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