National Science Olympiad Forum By SOF Olympiad Trainer

Shriya Sreekrishna from BLUEBELLS SCHOOL INTERNATIONAL, New Delhi

Subject :NSO Class : Class 5

Kavita wanted to toast some bread with the electric toaster. When she switched on the toaster, she received a mild electric shock. However, when her sister Komal tried the same, she did not feel any shock. What could be the possible reason for the difference in their experiences?
(i) Kavita's hands were wet but Komal's hands were dry.
(ii) Kavita was barefoot but Komal was wearing a pair of rubber slippers.
(iii) Kavita's body was a better conductor of electricity than Komal's.

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

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sunil from Holy Grace Academy, Thrissur

Subject :NSO Class : Class 10

Why does sun does not undergo fission?

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Ans 1:

pranav prasoon from paramekkavu vidya mandir, Thrissur

Class : Class 10

because there is not much fissionalble material as they are mainly constituted by hydrogen

Ans 2:

pranav prasoon from paramekkavu vidya mandir, Thrissur

Class : Class 10

because there is not much fissionalble material as they are mainly constituted by hydrogen

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HARSHAL KUTE from cambridge school buldhana, Buldhana

Subject :NSO Class : Class 6

Refer to the given Venn diagram and select the incorrect statement regarding P, Q and R.

A R has three pairs of jointed legs which help it to walk, run and climb.
B Q has paired and unpaired fins that help in movement in water.
C P has special air sacs connected to the lungs which aid in respiration process.
D Q is a shelled animal that possesses a muscular structure called foot which produces a series of wave like movements, pushing its body forward.

As per the question the animal Q is an shelled animal because it have endoskeletonSo the option D should be correct.

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Ans 1:

ATHARV RAHUL MAHAJAN from ST. STEPHENS SCHOOL CHANDIGARH, SAS NAGAR

Class : Class 6

In the solution it is said that 'Q' is a fish but in the ans it is something else can i get its explanation

Ans 2:

Souradeepto Das Mandal from Hyderabad Public School, Hyderabad

Class : Class 6

yeah do

Ans 3:

NISHTHA GUPTA from DPS R K Puram, newdelhi

Class : Class 10

i do not get the answer explain it

Ans 4:

Shreya Shruti from Airforce school , Bengaluru

Class : Class 8

Disagreed Utsavi

Ans 5:

Kushagra Chaturvedi from Podar International School Chinchwad, Pune

Class : Class 6

Utsavi u are correct

Ans 6:

SOUVAGYA SAHA from De Nobili School, DHANBAD

Class : Class 10

Ans 7:

Rishik De Sarkar from Delhi Public School Gurgaon, Gurgaon

Class : Class 7

Fish... dont have exogenic skeleton

Ans 8:

Ananya from GIIS, Bangalore

Class : Class 6

Excuse me utsavi, but SOF prepares questions like that for the exams to be more competitive

Ans 9:

Utsavi Priya from DPS RUBY PARK, KOLKATA

Class : Class 8

questions like what is p q r s etc. are very confusing and they should give straightforward questions which are easily understandable...even in maths or reasoning its the same thing......they should not give a whole achievers section test with only diagrams and stuff like whats p whats q......SOF should improve their questions....also They should make their site better....the site is so boring and we don't feel like taking tests...the site is so outdated...not even designed properly....there are always pictures for diagrams in maths or science questions.....very bad questions and content

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Mahak from Sarvodya sr sec school, Jhajjar

Subject :NSO Class : Class 6

The given graph shows the temperature changes when a sample of ice is heated. What is happening at point 1?

A The liquid is evaporating.
B The liquid is freezing.
C The solid is freezing.
D The solid is melting.

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Ans 1:

Sanket Kulkarni from Euroschool, Pune

Class : Class 8

How come solids have started melting at 0 degrees celsius

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ARKAJYOTI BERA from DAV HALDIA, HALDIA

Subject :NSO Class : Class 5

What is the formula of gravitational potential energy? A) 1/2mv square B) mgh C) 1/2mv square+mgh D) none of these

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Ans 1:

ARKAJYOTI BERA from DAV HALDIA, HALDIA

Class : Class 6

Option B

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Arnav Goel from Apeejay School , Noida

Subject :NSO Class : Class 7

Twenty per cent of Anuj's annual salary is equal to seventy-five per cent of Raj's annual salary. Raj's monthly salary is sixty percent of Ravi's monthly salary. If Ravi's annual salary is Rs. 1.44 lacs, what is Anuj's monthly salary?

(A) Rs. 2,70,000

(B) Rs. 27,000

(C) Rs. 3,24,000

(D) Rs. 5,400

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is B.

Ans 2:

from ,

Class :

27000

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A Kumar from SNSVM, East Singhbhum

Subject :NSO Class : Class 7

Read the given statements and select the correct option.
Statement 1 : An iron ball at 35°C is dropped in a mug containing water at 305.15 K. Then the heat will flow from the water to the iron ball.
Statement 2 : In convection, heated molecules of a liquid themselves move to carry heat from the hot region to the cold region.

A Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B Both statements 1 and 2 are true and statement 2 is not the correct explanation of statement 1.
C Statement 1 is true but statement 2 is false.
D Statement 1 is false and statement 2 is true.

very funny sorry good question!!!!!

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Ans 1:

DIPTANGSU PARBAT from SOUTH POINT HIGH SCHOOL, Kolkata

Class : Class 7

Ans 2:

A Kumar from SNSVM, East Singhbhum

Class : Class 8

who lol written this

Ans 3:

Ryan Ganguly from Ebenezer International School, Bangalore

Class : Class 8

Ans 4:

ANUSHKA PARIDA from INDIRA NATIONAL SCHOOL, PUNE

Class : Class 9

answer is wrong. u yourself have written that ball has higher temperature.so the answer should be C

Ans 5:

Joahanna Gabriel from Christwood school, Chennai

Class : Class 9

Ans 6:

Aryan Keswani from Delhi Public School, Mathura Road, New Delhi

Class : Class 10

Answer is D. 35 C = 308 K , but in question it says 305 K.

Ans 7:

Hritvi from Podar International School, Mumbai

Class : Class 7

Answer is D. There is no way it can be C because the temperature of iron ball is greater than that of water

Ans 8:

Akshara from NPS, Bengaluru

Class : Class 8

The answer is D only.. They have changed it.

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siddarth from DPS Ecity, Bengaluru

Subject :NSO Class : Class 4

Shweta conducted an experiment to find out the amount of light that can pass through a mirror, a frosted glass and a clear plastic sheet. She shone a torch on these three materials one at a time and used light sensors to measure the amount of light that passed through each of them. Which of the following graphs correctly shows the result of her experiment?

A
B
C
D