National Science Olympiad Forum By SOF Olympiad Trainer

SAMBIT DEB from IVWS, KOLKATA

Subject :NSO Class : Class 5

At a certain time of the day, the temperature over land is 21°C while the temperature over sea is 36°C. At this time ________.

AThe air pressure is lower over land than that over sea
BBreeze will flow from land towards the sea
CBreeze will flow from sea towards the land
DNone of these

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Hamsavarshini Swaminathan from St Anns Senior Secondary School, Roorkee

Subject :NSO Class : Class 8

Global warming leads to a rise in the sea level causing floods in the coastal areas. One of the main reasons of global warming is

A Combustion of fuels releases sulphur dioxide which increases the temperature
B Combustion of fuels releases carbon monoxide which decreases the temperature
C Combustion of fuels releases unburnt carbon particles which causes decrease in temperature
D Combustion of fuels releases carbon dioxide which causes increase in temperature.

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Ans 1:

Adway Bachchan from Indian School Sohar, Sohar

Class : Class 8

Ans 2:

Vihaan Nair from Ambassador School, DUBAI

Class : Class 8

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Raghav Mittal from DAV Public School, ludhiana

Subject :NSO Class : Class 8

A metre ruler is held vertically in front of a plane mirror of length 15 cm as shown in the given figure. Arun peeps through a hole at the 40 cm mark. The range of the scale of the metre ruler that can be seen is

A10 cm to 40 cm
B15 cm to 45 cm
C20 cm to 50 cm
DNone of these.

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Ans 1:

Rishi Gopi from Loyola, Trivandrum

Class : Class 9

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Mihir Rupani from Allen Career Institute, Rajkot

Subject :NSO Class : Class 9

Geetika poured 20 g of salt into 200 mL of water in a beaker. She stirred the water to dissolve the salt completely. Then she heated the solution until it was reduced to half. How many grams of salt can be recovered from the remaining solution?

A 0 g
B 10 g
C 20 g
D 40 g

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Prasanna Hegde from Vibgyor High Horomavu, BENGALURU

Subject :NSO Class : Class 3

Arrange the alphabets given below in a meaningful word and identify the category of the word.
O N A G M

A Flower
B Animal
C Fruit
D Body part

C is the correct answer for this scrambled word

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Prasanna Hegde from Vibgyor High Horomavu, BENGALURU

Subject :NSO Class : Class 3

Which is the next figure in the given pattern?

A
B
C
D

The answer A is correct

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Arihant Medhi from Dps Barasat, Kolkata

Subject :NSO Class : Class 3

Find the mirror image of the given figure, if mirror is placed vertically to the right.

A
B
C
D

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Ans 1:

Arihant Medhi from Dps Barasat, Kolkata

Class : Class 7

Ans 2:

Chaitanya from Surendranath Centenary School, Ranchi

Class : Class 6

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Suvan S from Edify School Chikkabanavara, Bangalore

Subject :NSO Class : Class 5

Select the option that pairs rocks of two different kinds as shown here in the box.

AGranite : Obsidian
BShale : Limestone
CSlate : Marble
DConglomerate : Obsidian

Correct answer is option D

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Ans 1:

Suvan S from Edify School Chikkabanavara, Bangalore

Class : Class 7

D

Ans 2:

ANANYA SHAH from UDGAM SCHOOL FOR CHILDREN , AHMEDABAD

Class : Class 8

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Sanjana Iyer from HFS Powai, Mumbai

Subject :NSO Class : Class 9

Given figures represent three different castes of a colony of honeybees.

Select the incorrect statement regarding these.

A P is the worker bee which is a sterile female.
B Q is the queen which lays both fertilised (2n) and unfertilised (n) eggs.
C R is the drone which is a fertile male.
D P and Q emerge from unfertilised eggs, while R emerges from fertilised eggs.