National Science Olympiad Forum By SOF Olympiad Trainer

Pramath Ram from Canara CBSE, Mangalore

Subject :NSO Class : Class 7

A drunkard is walking along a straight road. He takes 5 steps forward and 3 steps backward and so on. Each step is 1 m long and takes 1 s. There is a pit on the road 11 m away from the starting point. The drunkard will fall into the pit after

A 21 s
B 29 s
C 31 s
D 37 s.

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Ans 1:

Soumyajit Roy from Delhi Public School Jamnagar, Jamnagar

Class : Class 9

Ans 2:

Aditya kumar from Sapphire International School, Noida

Class : Class 8

Its "b" (sec with steps) (5-3)+(5-3)+(5-3)+5=11 (29 sec)

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dayalakshmi dinesh from BHAVAN'S MUNSHI VIDYASHRAM, Kochi

Subject :NSO Class : Class 5

If '+' means '÷' '-' means 'x', '÷' means '+' and 'x' means '-', then

36 x 12 + 4 ÷ 6 + 2 - 3 = ?

(A) 2

(B) 18

(C)

(D) 42

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dayalakshmi dinesh from BHAVAN'S MUNSHI VIDYASHRAM, Kochi

Subject :NSO Class : Class 5

After removing some squares from a big square, the following figure is obtained. The length of one side of a small square is 3 cm. Find the area of the figure.

(A) 68 cm²

(B) 603 cm²

(C) 612 cm²

(D) 729 cm²

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Ans 1:

Sumit G from Greenwood High International, Bengaluru

Class : Class 8

C. 612cm2 is the answer to this question

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Agnimitra Gupta from south point school, Kolkata

Subject :NSO Class : Class 3

If Sonia observes Half Moon on 10th February, then what would be the shape of Moon on 17th February.

A

B

C

D

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Ans 1:

Vanshika Gupta from Kulachi Hansraj Model School, Delhi

Class : Class 4

yes the question is incomplete

Ans 2:

Sneha Sarkar from South city international school, Kolkata

Class : Class 7

Yes the answer is confusing.

Ans 3:

Sidhesh Prabhudesai from Arya Vidya Mandir, Mumbai

Class : Class 4

Ans 4:

Divyamsh from The Sky World School, Panchkula

Class : Class 5

waxing or waning ? question is not clear

Ans 5:

AVYAAN KOCHHAR from Delhi Public School Dwarka, DELHI

Class : Class 3

FIRST QUARTER OR LAST QUARTER?

Ans 6:

Advay Dhua from Delhi Public School NOIDA, Noida

Class : Class 5

It should be specified that the moon is 1st or 2nd quarter

Ans 7:

Kavin Karthick M from DPS bangalore east, Bengaluru

Class : Class 6

if it is waning half moon, then it can be " no moon" also know? can anybody explain

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Hemant Ayuj from Shanti Asiatic, Ahmedabad

Subject :NSO Class : Class 6

Identify the joints shown in the figures and select the incorrect option regarding these.

A Joint P allows movement in one plane.
B Joint Q allows movement in many planes.
C Knee bones have two P joints.
D Joint Q acts like a pivot and allows the circular motion of the part around it.

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Hemant Ayuj from Shanti Asiatic, Ahmedabad

Subject :NSO Class : Class 6

Read the following characteristics of a plant.
(i). Leaves are large and flat with upper surface coated with wax.
(ii). Stomata are present on the upper surface of leaves to facilitate gaseous exchange.
(iii). Roots are either poorly developed or totally absent.
Identify the plant and select the correct option regarding it

A The plant is adapted to grow in dry, desert like condition.
B The plant is a floating hydrophyte.
C The plant will grow well in soil or air of moderate humidity.
D The plant has special characteristic to minimize the rate of transpiration

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Hemant Ayuj from Shanti Asiatic, Ahmedabad

Subject :NSO Class : Class 6

Match column I with column II and select the correct option from the codes given below.

A a -(iv), b -(i), c -(ii), d -(iii)
B a -(iii), b -(ii), c -(iv), d -(i)
C a -(iii), b -(iv), c - (ii), d -(i)
D a -(i), b -(iv), c -(ii), d -(iii)

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Ans 1:

sachinthite@rocketmail.com from Sinhghad Public School Korti, Pandharpur

Class : Class 4

sundar apratim waa chhan

Ans 2:

sachinthite@rocketmail.com from Sinhghad Public School Korti, Pandharpur

Class : Class 4

veryyyy niceee!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Ans 3:

sachinthite@rocketmail.com from Sinhghad Public School Korti, Pandharpur

Class : Class 4

correct answer is A because i have checked on internet

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AJAY KULSHRESHTHA from ,

Subject :NSO Class : Class 4

X is an animal which undergoes metamorphosis to develop into an adult. Which of the following animals can be X?

A
B
C
D All of these

Why is the answer A not D

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Ans 1:

OISHIK KUNDU from Delhi Public school North kolkata, baranagar

Class : Class 4

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ankitadasgupta from dps, Bengaluru

Subject :NSO Class : Class 7

Read the following statements and select the correct option.
Statement 1: Water present in oceans and seas cannot be used directly for human consumption.
Statement 2 : Water in oceans and seas have less amount of dissolved oxygen.

ABoth statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
BBoth statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
CStatement 1 is true but statement 2 is false.
DStatement 1 is false but statement 2 is true.

answer is wrong, if it is correct please explain. (as far as i know salt water is supposed to dissolve less oxygen.