National Science Olympiad Forum By SOF Olympiad Trainer

Shreya Bajpai from St Josephs Girls H S School , Bhopal

Subject :NSO Class : Class 8

The microorganisms that cause diseases are known as pathogens or germs. Microorganisms also cause diseases in animals and plants other than human beings. Select the incorrect statement from the following.

(A) Anthrax is caused by bacteria and it affects humans and cattle

(B) Rust of wheat is a fungal disease

(C) Citrus canker is a viral disease that affects citrus fruits

(D) Yellow vein mosaic is a viral disease, spread by insects and it affects vegetables.
it is completely wrong citrus canker is a disease that affects citrus fruits

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Ans 1:

Nandini Singh from Delhi Public School, Anuppur

Class : Class 9

I also thought that but it's not viral.

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Pulkit Khanna from DELHI PUBLIC SCHOOL RUBY PARK KOLKATA, Kolkata

Subject :NSO Class : Class 6

Shadow moves on screen when

(i) The source moves parallel to the screen.

(ii) The object moves parallel to the screen.

(iii) The source moves away from the screen.

(iv) Colour of the source of light changes.

(A) (i) & (ii)

(B) (ii) & (iii)

(C) (iii) & (iv)

(D) (i), (ii) & (iii).

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Ans 1:

Abhik Roy from Sri Chaitanya Techno School, Bengaluru

Class : Class 9

I think A is the answer

Ans 2:

Pragya Mahajan from BCM Arya Model Sr Sec School, Ludhiana

Class : Class 8

i think d. is the ans.

Ans 3:

Aditya Sai Vemparala from Amanora school, Pune

Class : Class 10

Ans 4:

ANWESH from DAV DEEPSIKHA, DEEPSIKHA

Class : Class 8

D IS THE ANSWER

Ans 5:

Ritayan Misra from Aditya Birla Public School, Rayagada

Class : Class 7

I think A is the answer,other two options show change of size of shadows not movement.

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Pulkit Khanna from DELHI PUBLIC SCHOOL RUBY PARK KOLKATA, Kolkata

Subject :NSO Class : Class 6

The shape of the shadow depends upon

(A) Size of the object

(B) Position of source of light

(C) Size of source of light

(D) Shape of the object

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Ans 1:

Vasu tyagi from St Joseph's High school, Panvel

Class : Class 6

Your answer is D ) because shape is been asked not size !

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Pulkit Khanna from DELHI PUBLIC SCHOOL RUBY PARK KOLKATA, Kolkata

Subject :NSO Class : Class 6

Which of the following statements is false?

(A) Shadows cannot be formed when an object allows some light to pass through it.

(B) Shadows are always formed on the opposite side of the light source.

(C) A shadow has a similar shape to the object that forms the shadow.

(D) An object can form as many shadows as there are light sources around it.

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Pulkit Khanna from DELHI PUBLIC SCHOOL RUBY PARK KOLKATA, Kolkata

Subject :NSO Class : Class 6

Study the set-up below.

Which of the following shows what the shadow will look like?

(A)

(B)

(C)

(D)

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Pulkit Khanna from DELHI PUBLIC SCHOOL RUBY PARK KOLKATA, Kolkata

Subject :NSO Class : Class 6

The image formed by a pinhole camera is upside-down because

(A) Light travels in straight line.

(B) Light rays become laterally inverted as they pass through a pin hole camera.

(C) Light rays pass through the pin hole.

(D) Light rays get reflected.

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Ans 1:

KONADA GAGNESH from BALDWIN BOYS HIGH SCHOOL, BENGALURU

Class : Class 7

Ans 2:

Tushar from DPS, Bengaluru

Class : Class 9

the answer should be option A.

Ans 3:

Sagnik Das from Gorabazar Iswar Chandra Institution, Berhampore

Class : Class 10

A

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Pulkit Khanna from DELHI PUBLIC SCHOOL RUBY PARK KOLKATA, Kolkata

Subject :NSO Class : Class 6

The Image formed in the water is

(A) Erect

(B) Diminished

(C) Inverted

(D) None of these.

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abhinav from d a v public school, Angul

Subject :NSO Class : Class 5

If an earthquake occurs, what should you do?

(A) If you are indoors, stay in and get under a desk or a table

(B) If you are outdoors, stay away from trees and buildings

(C) If you are on a beach, leave and find high ground

(D) All of the above.

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Ans 1:

Sobia khan from Sardar Patel Vidyalaya, New Delhi

Class : Class 7

the answer is d

Ans 2:

Saswatayu Sengupta from Don Bosco Park Circus , Kolkata

Class : Class 7

D

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abhinav from d a v public school, Angul

Subject :NSO Class : Class 5

Which of the following is the correct reason for the occurrence of earthquake ?

(A) Too many buildings are in one location

(B) The Moon pulls on Earth's surface

(C) Pressure builds up and is suddenly released

(D) Underground explosions take place.

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Ans 1:

Saswatayu Sengupta from Don Bosco Park Circus , Kolkata

Class : Class 7

C

Ans 2:

abhinav from d a v public school, Angul

Class : Class 5

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abhinav from d a v public school, Angul

Subject :NSO Class : Class 5

Read the experiment and answer

In three 500 mL beakers, Ahmed put melted ice water, room-temperature water, and hot water. He put a thermometer into each beaker and recorded the temperature. He carefully placed a single drop of blue food coloring in the center of the surface of the water in each beaker. He planned to take observations at 5 minutes, 10 minutes, 20 minutes, and 30 minutes.

Which of the following statements can be explained by Ahmed's experiments ?

(A) The smell of one person's perfume spreads in all corners of a warm room

(B) The melting of ice in hot and warm water

(C) The effect on volume of heating water

(D) The changing of phase, or state, from liquid to gas.

it is correct because the perfume is in solid form but when we spray it is in liqid form

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Ans 1:

abhinav from d a v public school, Angul

Class : Class 5

it is correct

Ans 2:

Saswatayu Sengupta from Don Bosco Park Circus , Kolkata

Class : Class 7

A

Ans 3:

abhinav from d a v public school, Angul

Class : Class 5

it is correct because the perfume is in lid but when we spray it is in gaseous form

Ans 4:

Kaustubhi Reddy from Meridian hyderabad, Hyderabad

Class : Class 4

I think question is incorrect as the experiment has two parts to it one is Newtons law of thermal cooling and the solubility and temp relation .The blob of food colour will disperse basis the varied temperature and rate of change of temperature. The question is not for the intended students and the options are wrong

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