National Science Olympiad Forum By SOF Olympiad Trainer - Page 765

User Forum

Ask Your Question

Select Class:

Shomili from Global Indian International School, Singapore

Subject :NSO Class : Class 6

A small cardboard is kept between the wall and the bulb in a room. At which position the shadow formed is sharp?

A The cardboard is held close to the wall.
B The cardboard is held at mid position between them.
C The cardboard is held close to the bulb.
D Both a and c

The answer isCBut I think it should be A.I actually tried it and it was was the sharpest when held close to the wall.

View All Answers (12)

Ans 1:

sujata patel from Podar International, Pune

Class : Class 6

aaaaaaaaaaaaaaaaaaaaa

Ans 2:

Anav Jain from DPS , Delhi

Class : Class 3

answer is A . I checked with a torch.

Ans 3:

Can I get Rank 35 darryl from Global Indian international school, Brawl stars

Class : Class 8

Ans 4:

Bhavtosh Tripathi from Maneckji Cooper Education Trust School, Mumbai

Class : Class 9

The answer should be A.When the object is close to the bulb more light will be diffracted so the image will not be sharp.I have performed this at a lab.

Ans 5:

Deeptajit Roy from Gems Modern Academy, Dubai

Class : Class 10

answer is A. i just checked this with my lamp

Ans 6:

Dheeraj Thriyambak M from Sri Sankara Senior Secondary School Adyar, Chennai

Class : Class 6

Report error

Ans 7:

Dheeraj Thriyambak M from Sri Sankara Senior Secondary School Adyar, Chennai

Class : Class 6

Answer is A probably we should complain

Ans 8:

Deeptajit Roy from Gems Modern Academy, Dubai

Class : Class 10

the answer is A, the shadow is sharp or perfect in shape when close to a screen

Ans 9:

Shweta Garg from Vibgyor high, Vadodara

Class : Class 8

the questions below please give her an appointment on Wednesday morning or Sunday or Friday or Thursday or Wednesday or Tuesday or Monday or Saturday afternoon to be more difficult times that he doesn't say they can't have enough

Ans 10:

Pratheek from Null, Null

Class : Class 4

The answer must be A. We have performed this experiment at our school.

Ans 11:

Shreyan from San, Pune

Class : Class 6

Ans 12:

Shweta Garg from Vibgyor high, Vadodara

Class : Class 8

Submit Your Answers

Post Your Answer

Dhruvi from Delhi Public School, Navi Mumbai

Subject :NSO Class : Class 5

Out of a class of 45 students, 2/3 went on a picnic. How many students stayed in school?

A 20
B 15
C 25
D 30

View All Answers (2)

Ans 1:

Sumit G from Greenwood High International, Bengaluru

Class : Class 8

Ans 2:

Mishika shah from little angels high school, gwalior

Class : Class 9

Ans is b

Submit Your Answers

Post Your Answer

Dhruvi from Delhi Public School, Navi Mumbai

Subject :NSO Class : Class 5

View All Answers (0)

Submit Your Answers

Post Your Answer

Dhruvi from Delhi Public School, Navi Mumbai

Subject :NSO Class : Class 5

The given figure is made up of a rectangle, a big square and 2 smaller identical squares. What is the perimeter of the figure?

A 84 cm
B 66 cm
C 72 cm
D 60 cm

how come

View All Answers (6)

Ans 1:

Advaith from Manipal School, Mangalore

Class : Class 6

Ans 2: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

Ans 3:

Kevin Frederick S from Stanes School - ICSE, Coimbatore

Class : Class 5

hulyh

Ans 4:

Dishant Dutta from St Georges school, New Delhi

Class : Class 7

Why isn't it 72?

Ans 5:

Aarush Thakur from DPS, Gurgaon

Class : Class 6

B) 66

Ans 6:

Lakshay Dhyani from MHS, Kanpur

Class : Class 10

C.72

Submit Your Answers

Post Your Answer

Dhruvi from Delhi Public School, Navi Mumbai

Subject :NSO Class : Class 5

Mrs. Sharma's monthly salary is Rs. 56800. She spends Rs.39800 and saves the remainder every month. How many months will she take to save at least Rs. 1000000?

A 64
B 72
C 59
D 56

View All Answers (2)

Ans 1:

Aadit Dasburma from National Public School .HSR Layout , Bengaluru

Class : Class 5

Even I don't know how to solve it.

Ans 2:

Ruchi Khanna from strawberry fields high school , Chandigarh

Class : Class 5

can anyone explain how??really puzzled!

Submit Your Answers

Post Your Answer

SATISH GUDWANI from mvn, Faridabad

Subject :NSO Class : Class 6

The given diagram shows the positions of four different objects after they have been dropped into a trough of water. Which of the following correctly matches the objects used?

A 1- Ping pong ball, 2 – marble, 3 - crushed aluminium foil, 4 - iron rod

B 1 – Ping pong ball, 2 – iron rod, 3 – crushed aluminium foil, 4 – marble

C 1 – Crushed aluminium foil, 2 – ping pong ball, 3 – iron rod, 4 – marble

D1 – Crushed aluminium foil, 2 – iron rod, 3 – marble, 4 – ping pong ball

plz explain how

View All Answers (0)

Submit Your Answers

Post Your Answer

Aarti golyan from Indian school sohar, sohar

Subject :NSO Class : Class 7

A food chain in an aquarium is shown below.
Water plants → Guppy fish → Angelfish →Snakeheads
If the snakeheads were removed, which graph shows the changes in the population of organisms in the aquarium?

A
B
C
D

View All Answers (2)

Ans 1:

Senthil Kumar from ARB INTERNATIONAL SCHOOL, Coimbatore

Class : Class 7

I THINK SO OPTION C IS THE CORRECT OPTION.BECAUSE GUPPY FISH WILL EAT THE PLANTS ,WHEN IT IS REDUCED THEN NO ONE WILL EAT THE PLANTS.

Ans 2:

Nikhil Handa from Army Public School,Dhaula Kuan, New Delhi

Class : Class 8

C would be the answer

Submit Your Answers

Post Your Answer

jeeva from Kendriya Vidyalaya Kottayam, Kottayam

Subject :NSO Class : Class 7

Sunita prepared two cups of water (one hot and one cold), and then covered them. Look carefully at the results she obtained after 2 minutes.

Which of the following statements about the results is not true?

(A) Water vapour in the surrounding warmer air condenses on the cold metal cover of the cup containing water.

(B) Water particles from the hot water condense when they meet the cool inner surface of the metal cover.

(D) When the heated particles of water vapour present in the air above the hot water hit the cold cover, they lose heat and condense.

what is the correct answer and how ?

View All Answers (0)

Submit Your Answers

Post Your Answer

Soham Rupesh Bhanare from Montfort Sr. Sec. school (C.B.S.E.),Nagpur, Nagpur

Subject :NSO Class : Class 7

Four different-sized beakers are filled with water up to the same height. The temperature of the water is same in all four beakers. If we put 100 gram of ice in each beaker, what effect will occur?

A The water temperature in beaker 2 will change the most.
B The ice will melt fastest in the beaker 3.
C The temperature changes will be same in all four beakers.
D The temperature of the water in beaker 3 will change the most.

In the OSDS, this question is there.The solutions say-(The temperature changes will be same in all four beakers)-this is the answer.

View All Answers (1)

Ans 1:

Dhruvan G from Indian School Al Ghubra, Muscat

Class : Class 8

It should be a as it has more surface area

Submit Your Answers

Post Your Answer

Ishaan Roy from Sri Chaitanya Techno School, Bengaluru

Subject :NSO Class : Class 5

It looks like a bear but is not. It spends almost 17 hours a day sleeping while hanging upside down on a tree branch. It lives for about 40 years and in that time moves around only eight trees.

The animal referred to in the above paragraph is

(A) Monkey

(B) Sloth

(D) Gibbon.

View All Answers (1)

Ans 1:

Debarshee Rakshit from DPS Megacity, Kolkata

Class : Class 8

Sloth as i think.

User Forum

Ans 1:

Ans 2:

Ans 3:

Ans 4:

Ans 5:

Ans 6:

Ans 7:

Ans 8:

Ans 9:

Ans 10:

Ans 11:

Ans 12:

Ans 1:

Ans 2:

Ans 1:

Ans 2: (Master Answer)

Ans 3:

Ans 4:

Ans 5:

Ans 6:

Ans 1:

Ans 2:

Ans 1:

Ans 2:

Ans 1:

Ans 1:

Related Links