National Science Olympiad Forum By SOF Olympiad Trainer

arav agrawal from kaanger valley academy, Raipur

Subject :NSO Class : Class 8

Which of the following optical device(s) uses a lens to form a real image of an object?
(1) Magnifying glass
(2) Pinhole camera
(3) Slide projector

A(3) only
B(1) and (2) only
C(1) and (3) only
D(2) and (3) only.

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Ans 1:

Lakshya Ajay Kawade from Holy Cross Kapa , Raipur

Class : Class 10

It should option C

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Saransh Sharma from St. Anselm's English medium School, Sawai Madhopur

Subject :NSO Class : Class 8

The situation in which motion is caused by the application of a contact force is

AA satellite orbiting Earth
BA magnet attracting paper clips
CA man hitting a cricket ball with a bat
DA magnet repelling another magnet.

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Manvik Sai from Edify, Kurnool

Subject :NSO Class : Class 3

Study the given flow chart carefully. Which of the following correctly identifies P, Q and R?

	P	Q	R
A	Ice cube	Cold Drink	Oxygen
B	Oxygen	Hydrogen	Water Vapour
C	Coca cola	Milk	Vinegar
D	Water Vapour	Oxygen	Milk

A

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Ans 1:

Manvik Sai from Edify, Kurnool

Class : Class 4

Aaaaa

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Keshav Sharma from G.D Goenka Public School Siliguri, Siliguri

Subject :NSO Class : Class 6

Consider a light steel bar and a light iron bar which are attracted to a magnet as shown in the given figure. What will possibly happen when the magnet is removed?

AThe steel and iron bars repel each.
BBoth steel and iron bars lose their magnetism.
CSteel bar retains its magnetism and iron bar loses its magnetism.
DIron bar retains its magnetism and steel bar loses its magnetism.

very bad

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Ans 1:

Rithvik Chandra from Greenwood High School, Bangalore

Class : Class 6

it is quite confusing, but apparently steel retains its magnetic properties so the answer is C

Ans 2:

Rithvik Chandra from Greenwood High School, Bangalore

Class : Class 6

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Ishaan Gupta from Cornerstone Public School, Hyderabad

Subject :NSO Class : Class 6

There are 18 girls and 24 boys in a class. 2/3 of the girls and 5/12 of the boys play the piano. Find the ratio of the number of girls who play the piano to the total number of pupils who do not play the piano in the class.

A 3 : 7
B 3 : 5
C 5 : 6
D 3 : 4

why is everything form maths

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Anwita L Bhat from Vijaya vittala vidyashala, Mysore

Subject :NSO Class : Class 4

The layer of Earth which is molten and is mainly made of iron and nickle is _______.

ACrust
BMantle
COuter core
DIner core

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Ans 1:

Anwita L Bhat from Vijaya vittala vidyashala, Mysore

Class : Class 4

The answer's actually inner core

Ans 2:

R R from DPS, Kuwait

Class : Class 4

ans is mantle

Ans 3:

Keerthi A from CampusK, Chennai

Class : Class 4

Ans 4:

Santina Suzanne from owis, bangalore

Class : Class 4

ans is mantle

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Vedang Shridhar Sasturkar from Vasant Valley School, New Delhi

Subject :NSO Class : Class 7

The diagram shows a destarched, variegated leaf, partly covered by black paper. The plant is placed in bright light for several hours.
Four discs were then cut from the leaf in the positions (1 - 4) as shown in the figure and were tested for starch. Which disc contains starch?

A1 only
B1 and 2 only
C2 only
D3 and 4 only

Part 1 Should be starching as it is theonly one "in sunlight for several hours"

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Vibhati Ranjan from The Presidential School, Visakhapatnam

Subject :NSO Class : Class 6

Properties of a few substances are given as:
W : Gets powdered easily
X : Does not mix with water
Y : Can be beaten into thin sheets
Z : Partially allows light to pass through
W, X, Y and Z could be respectively

AChalk, butter, gold and tracing paper
BGlass, honey, sulphur and water
CPaper, Rubber band, wool and steel
DSugar, ink, paper and copper.

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Vibhati Ranjan from The Presidential School, Visakhapatnam

Subject :NSO Class : Class 6

A book and a wooden block of similar size are kept in same position in front of a light source as shown in figure. Which of the following is correct regarding the shadow of the objects?

ABoth the shadows are equal in size.
BShadow of the book is larger than of block.
CShadow of the block is larger than of book.
DThe image distance for book will be greater than for wooden block.