National Science Olympiad Forum By SOF Olympiad Trainer

Syed Mohammad Hussain from ISAM, Muscat

Subject :NSO Class : Class 5

Which of the following converts chemical energy to various forms of energy?

A Electric iron
B Microwave
C Bomb
D Television

Ans 1:

Shreejith from EuroSchool , Bangalore

Class : Class 7

CWhen a bomb explodes,chemical energy stored in the chemicals that form the bomb converts into heat, sound and light energy.

Ans 2: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

C

When a bomb explodes, chemical energy stored in the chemicals that form the bomb converts into heat, sound and light energy.

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Amol Athawale from WoodRidge High, aurangabad

Subject :NSO Class : Class 8

Read the given statements and select the correct option.
Statement 1 : Silver objects become green and lose their shine with the passage of time.
Statement 2 : Silver reacts with carbon dioxide and moisture present in the atmosphere.

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

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Ans 1:

Daksha Swaminathan from Horiozon Scholars and Neo Kids, Mumbai

Class : Class 8

Ans 2:

Student from School, City

Class : Class 8

Silver can also react with SO2, sulphur dioxide, to tarnish.

Ans 3:

Kaushik Srivatsa H from Bala Vidya Mandir Global, Bangalore

Class : Class 7

Silver turns black, not green. And also silver does not react with water. So, obviously D is the answer.

Ans 4:

Ankit kumar Jha from Ryan International School , Ghaziabad

Class : Class 9

ans D is the correct answer as silver turns black after reaction to hydrogen sulphide

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aadityaarmaan from KVS Chabua, Dibrugarh

Subject :NSO Class : Class 7

If the percolation rate of water of a particular soil sample is 20 mL/min, then how much time will 200 mL of water take to percolate completely into the soil?

A 800 s
B 600 s
C 200 s
D 400 s

..

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Ans 1:

Raksha Pankaj Jangam from Millennium National School , Karve naga pune

Class : Class 7

Ans 2:

aarav shankar from st xaviers high school, gurugram

Class : Class 7

Ans 3:

Gauri Singh from St Johns School Marhauli, Varanasi

Class : Class 8

20 mL multiplied by 10 equals 200 ml.. likewise, multiply 1 min by 10. the answer is 10 minutes or 600 seconds.

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saisavit from sri kumaran ps, bangalore

Subject :NSO Class : Class 3

Sheetal has taken an empty bottle and fixed a deflated balloon on its mouth. She placed the bottle in a container filled with hot water. After some time, the balloon gets inflated as shown. What could be the most appropriate reason for this?

A Air when gets heated becomes heavier and rises up.
B Air when gets heated becomes lighter and settles down.
C Air when gets heated becomes heavier and settles down.
D Air when gets heated becomes lighter and rises up.

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Ans 1:

Ivan Tyagi from Chirec International School , Hyderabad

Class : Class 8

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Ans 2:

akshitha from Euroschool, Bengaluru

Class : Class 3

d is the answer

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Vedant Sharma from JPHS, Jaipur

Subject :NSO Class : Class 5

Identify X, Y and Z from the given figure and select the correct statement regarding them.

AZ is attached to bones whereas X is not attached to bones
BY is voluntary muscle whereas Z is involuntary muscle.
CX is very strong muscle that works continuously.
DNone of these

How?

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Ans 1:

Dhairya from GREEN FIELDS SCHOOL, DELHI

Class : Class 8

a b c d

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ADITYA KISHOR from dps, gaya

Subject :NSO Class : Class 9

A particle moves on a circular path of radius 7 m with uniform speed of 11 m/s. If it reaches point T from point S, a diametrically opposite point, then during this interval

(i) The average acceleration is zero.
(ii) The average velocity is zero.
(iii) The average acceleration is 11 m/s².
(iv) The average velocity is 7 m/s.
Which of the following options is correct?

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

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ADITYA KISHOR from dps, gaya

Subject :NSO Class : Class 9

A student plotted the following four graphs representing the variation of velocity v of sound in a gas with the pressure P for a given temperature. Which one is correct?

A
B
C
D

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ADITYA KISHOR from dps, gaya

Subject :NSO Class : Class 9

A cricket ball of mass 150 g moving with a speed of 126 km/h hits at the middle of the bat, held firmly at its position by the batsman. The ball moves straight back to the bowler after hitting the bat. Assume that the ball rebounds with same speed and they remain in contact for 0.001 s, the force that the batsman had to apply to hold the bat firmly at its place would be

A10.5 × 10^-4 N
B2.1 × 10³ N
C1.05 × 10⁴ N
D2.1 × 10⁴ N

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ADITYA KISHOR from dps, gaya

Subject :NSO Class : Class 9

A boy throws a cricket ball from the boundary to the wicket-keeper. If the frictional force due to air cannot be ignored, the forces acting on the ball at the position X are represented by

A
B
C
D