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Shreya Sampathkumar from Christ Academy, Bengaluru
Subject :NSO    Class : Class 9

In an experiment to determine the speed of sound, a gun was fired and an observer at a certain distance (x) away measured the time interval (t) between seeing the flash and hearing the shot. Then the speed of sound in air is calculated by x/t.
Which of the following will affect the result?
(i) Temperature of the environment.
(ii) Pitch of the gunshot.
(iii) Wind blowing from the gunner to the observer.
(iv) Loudness of the gunshot.
(v) Wind blowing from the observer to the gunner.
(vi) Quality of sound by gunshot.

A(i), (iii) and (iv)
B(i), (iii) and (v)
C(i), (ii), (iii) and (vi)
D(ii), (iv), (v) and (vi)


Ans 1:

Aditi Agrawal from Sunbeam School Bhagwanpur, VARANASI
Class : Class 9
How come temp does not affect the experiment?

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Shreya Sampathkumar from Christ Academy, Bengaluru
Subject :NSO    Class : Class 9

Ans 1:

Sanya Madan from Wisdom World School, Kurukshetra
Class : Class 10
B

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ROHAN from ARMY PUBLIC SCHOOL, DANAPUR CANTT, PATNA-801503, PATNA
Subject :NSO    Class : Class 8

Ans 1:

Suraj from Sivasivani public school, Vishakapatnam
Class : Class 8
D

Ans 2:

Suraj from Sivasivani public school, Vishakapatnam
Class : Class 8
A

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Vanya Parolia from pps Chandivali, Mumbai
Subject :NSO    Class : Class 7

Cocoons of silkworms are used for obtaining silk fibres. The ……A………… of silk worms is known as………B…………while the process of taking out threads from the ……C………… is called …………D………....

AA - shearing , B - pisciculture , C - larva , D – reeling
BA - rearing , B - sericulture , C - larva , D – reeling
CA - tearing , B - pisciculture , C - cocoon , D – reeling
DA - rearing , B - sericulture , C - cocoon , D – reeling


interesting question

Ans 1:

Aditya kumar from Sapphire International School, Noida
Class : Class 8
ITS OPTION "D"

Ans 2:

Anurag bagal from DAV public school Airoli, Navi Mumbai
Class : Class 7
Option D

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Ridhi Goyal from DAV Public School, Ludhiana
Subject :NSO    Class : Class 8

Ans 1:

Siddharth Mahesh from mdav public school , Hyderabad
Class : Class 8
why cant it be surgical mask

Ans 2:

chivava from Sheth Vidya Mandir English High School, Vasai
Class : Class 8
water tumbler because it help water to pass through it

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Pranav from PIES, Abu Dhabi
Subject :NSO    Class : Class 5

Sunidhi could see a pointed beam of light on settingup an experiment as shown here. She used sheets P, Q and R made of three different materials respectively. She noticed that when she replaced the sheet P with a sheet made of the same material as sheet Q, then she could see the whole candle.

Which of the following options is correct regarding P, Q and R?

ASheet Q is made of a transparent material.
BSheet R is made of a transparent material.
CSheet P is made of an opaque material.
DAll of these.


couldnt understand

Ans 1:

SOUVAGYA SAHA from De Nobili School, DHANBAD
Class : Class 6

Ans 2:

akshaj das from NARAYANA E TECHNO kaggdaspura, Bengaluru
Class : Class 5

Ans 3:

Ajantha GS from SDM CBSE English Medium School, Dharwad
Class : Class 5

Ans 4:

ADITI NANDI from DON BOSCO SCHOOL, SILCHAR
Class : Class 6
answer is D. BECAUSE IF P IS OPAQUE THAN ONLY THE SHADOW WILL WILL BE THE HOLE AND LIGHT DOES NOT PASS THROUGH OPAQUE MATERIAL.IF P IS OPAQUE THAN Q AND R WILL BE TRANSPARENT.

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ashok tyagi from ,
Subject :NSO    Class : Class 7

Ans 1:

Soumalya mallick from St. Stephens School, Kolkata
Class : Class 6
the answer is b

Ans 2:

Aditya kumar from Sapphire International School, Noida
Class : Class 8
ITS OPTION "D" as it increases surface area for intake of more oxygen

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ashok tyagi from ,
Subject :NSO    Class : Class 7

Ans 1:

Kuldeep Battula from Deens Academy, Bengaluru
Class : Class 3
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Ans 2:

thechampiondaksh from K R Mangalam World School, New Delhi
Class : Class 8
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Ans 3:

Kuldeep Battula from Deens Academy, Bengaluru
Class : Class 3
cf1dxF http://www.LnAJ7K8QSpfMO2wQ8gO.com

Ans 4:

Kuldeep Battula from Deens Academy, Bengaluru
Class : Class 3
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Ans 5:

Aditya kumar from Sapphire International School, Noida
Class : Class 8
NITROGEN , PHOSPHORUS, POTASSIUM ARE EXXESIVELY PRESENT WHICH CAN CREATE THE SOIL ACIDIC . THAT IS WHY ANSWER IS "C"

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Aditya Mishra from Sri Kumaran Children's Academy, Bengaluru
Subject :NSO    Class : Class 6

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PARTH SETHI from DPS Noida, New Delhi
Subject :NSO    Class : Class 5

Ans 1:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 6
C and A are same . But how can Charles and Annie ( C and A ) be same ?

Ans 2:

Mridul Jain from Shishukunj International School Indore, Indore
Class : Class 7

Ans 3:

Krethick Ravichandrsn from Yuvabharathi International School, Singapore
Class : Class 7

Ans 4:

ADITI NANDI from DON BOSCO SCHOOL, SILCHAR
Class : Class 6
DIFFERENCE BETWEEN OPTION A. AND C. IS IN OPTION A THE MIDDLE RECTANGLE IS THINNER WHEREAS THE OTHER IS WIDER.

Ans 5:

akshaj das from NARAYANA E TECHNO kaggdaspura, Bengaluru
Class : Class 5

Ans 6:

ishit from EUROSCHOOL THANE, THANE WEST
Class : Class 6

Ans 7:

Ayush Kumar from Maria Assupta Sr. Sec. Convent School, KASHIPUR
Class : Class 5
DIFFERENCE BETWEEN OPTION A. AND C. IS IN OPTION A THE MIDDLE RECTANGLE IS THINNER WHEREAS THE OTHER IS WIDER.

Ans 8:

Trideev Reddy Maddirevula from IIPS, Riyadh
Class : Class 5
A AND C ARE THE SAME

Ans 9:

OISHIK KUNDU from Delhi Public school North kolkata, baranagar
Class : Class 4
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Ans 10:

Mohammed Najl from GEMS New Millennium School Al Khail, Dubai
Class : Class 5
option c and a are same.

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