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arpit12345 from Ryan International School, New Delhi
Subject :NSO    Class : Class 10

Observe the given experimental set-up carefully.
image
Which of the following could be the possible observation and inference drawn?

A The solution becomes blue-green due to formation of copper oxide, P is acidic.
B The solution becomes blue-green due to formation of copper chloride, P is basic.
C The solution becomes white due to formation of calcium hydroxide, P is basic.
D The solution becomes white due to formation of calcium oxide, P is acidic.


the correct answer should be (b) because copper cant displace h2 from HCl

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
Yes, the correct answer is B.

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Sarthak Gupta from DPS, Haryana
Subject :NSO    Class : Class 4

Ans 1:

Malavya Chaturvedi from Study Hall, Lucknow
Class : Class 8
Answer is C

Ans 2:

SHAH HITANSH JINESH from S H KHARAWALA, AHMEDABAD
Class : Class 8
The Answer is C. NOW THE QUESTION IS HOW? THE ANSWER IS THE MACHINES SHOWN IN PICTURE A,B,D RUNS BY MUSCULAR . FORCE. THE OPTION C RUNS BY MOTOR.

Ans 3:

PRAGWANSH JENA from DELHI PUBLIC SCHOOL, Raipur
Class : Class 8

Ans 4:

Saarth Agrawal from Podar International School , Mumbai
Class : Class 6
c

Ans 5:

Koyel Biswas from Adamas World School, Kolkata
Class : Class 5

Ans 6:

Bharghavi V from Vedavalli vidyalaya senior secondary school , Walajapet
Class : Class 4
C auto motor other we should ride

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arpit12345 from Ryan International School, New Delhi
Subject :NSO    Class : Class 10

Four students P, Q, R and S noted the initial colour of the solutions kept in beakers I, II, III and IV. After inserting zinc rods in each solution and leaving them undisturbed for two hours, the colour of each solution was again noted in the form of table given below :

image
Which student noted the colour change in all the four beakers correctly?

A P
B Q
C R
D S


the correct answer is not given because acc. to reactivity series only beaker 1 will have some change

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Anirudh Thakkar from Mata gujri public school, Chak suhele wala
Subject :NSO    Class : Class 3

Ans 1:

Anirudh Thakkar from Mata gujri public school, Chak suhele wala
Class : Class 3
how?

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Ashmi Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Subject :NSO    Class : Class 2

Ans 1:

Reyansh Sarkar from Delhi Public School, Chandigarh
Class : Class 2
Option D is not incorrect, since earth's position change and not sun's. Further, option C should be the wrong answer, since shadow length are same in 10AM and 2 PM, 11AM, 1 PM and likewise

Ans 2:

Mahi Chandra from ICON School of Excellence, Bengaluru
Class : Class 3
Sun's position doesn't change, we see it changing due to earth's rotation i.e. earth's changing position. Then how D is incorrect option. No option is incorrect in this question.

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Kaustubhi Reddy from Meridian hyderabad, Hyderabad
Subject :NSO    Class : Class 5

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ananya singh from doon international school, Dehradun
Subject :NSO    Class : Class 6

Ans 1:

Nikkita from Euroschool Whitefield, Bengaluru
Class : Class 6
the answer is (a) because the more the height of the ramp the more you need to give force

Ans 2:

MADDILETI REDDY MARAM REDDY from NVN, VIJAYAWADA
Class : Class 6
A

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ALBERT BERKMANS from ZYDUS SCHOOL FOR EXCELLENCE, AHMEDABAD
Subject :NSO    Class : Class 2

Ans 1:

Arnav Basu from faps, Bengaluru
Class : Class 6

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Sayantan from Whitefiels Global School, Bangalore
Subject :NSO    Class : Class 4

Ans 1:

RAHUL SINHA from D.A.V Public Koyla Nagar Dhanbad, dhanbad
Class : Class 7
Rotation causes day and night. While revolution causes change in season.

Ans 2:

Prathamesh from Gopals Garden High School, Mumbai
Class : Class 4
Rotation of earth causes day and night and change of seasons.

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Sayantan from Whitefiels Global School, Bangalore
Subject :NSO    Class : Class 4

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
The correct answer is A.

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