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Aparna praveen from Rajagiri, Ernakulam
Subject :NSO    Class : Class 4

Ravi set up an experiment as shown in the given figure.The figure shows five identical balls being suspended on a rod by strings of different lengths. Ravi then cut all five strings at the same time and the balls were allowed to fall freely to the ground.

Which of these statements holds true for this experiment?

ABall ‘b’ had the greatest impact on the ground.
BBall ‘a’ had less gravitational potential energy than ball ‘c’ at the start.
CBall ‘d’ had the most gravitational potential energy at the start.
DBalls ‘a’ and ‘e’ had different amounts of gravitational potential energy at the start due to their different positions along the rod.

Ans 1:

Dishita Santosh Walujkar from Nutan English School, Kurduwadi
Class : Class 7
A

Ans 2:

ikshika kumar from MVN SCHOOL, FARIDABAD
Class : Class 7
A) Ball ‘b’ had the greatest impact on the ground.

Ans 3:

Abhineet Nandy from DPS Whitefield, Bangalore
Class : Class 9
The answer is [A]

Ans 4:

Satvik Agrawal from Delhi Public School, bhopal
Class : Class 5
aaa aaa aaa

Ans 5:

Arihant Kumar from Lawrence High School, Bengaluru
Class : Class 4
Why not D

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Anmol kathar from deogiri global academy, aurangabad
Subject :NSO    Class : Class 6

Which of the following statements are true about acid rain ?
(i) Acid rain has harmful effects on the living beings.
(ii) Acid rain mainly comprises of H2SO4 and HNO3.
(iii) Greenhouse gases are mainly responsible for causing acid rain.
(iv) Acid rain causes damage to buildings.

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


but here option C is also true ,so there have the option as 'all of these'.

Ans 1:

HARSHAL KUTE from cambridge school buldhana, Buldhana
Class : Class 6
all are correct

Ans 2:

Saanvi from Canara CBSE, Mangalore
Class : Class 8
Answer is D

Ans 3:

ttraj from KV IIT, Chennai, Chennai
Class : Class 3
D

Ans 4:

Videh Jain from Bluebells School International, Delhi
Class : Class 6
ans is also D

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Shlok from Tomoae , Amravati
Subject :NSO    Class : Class 7

Kirti kept a metal spoon in a glass jar filled with pickle for a few days. She observed that there were holes in the spoon. What could be the possible reason for this?

A Oil present in pickle dissolves the metal.
B Oil present in pickle liberates a gas in which metal gets dissolved.
C Metal reacts with acid present in pickle to form salt hence, metal gets dissolved.
D The glass reacts with metal to give acid which dissolves the metal.


i didnt get this . answer says acid reacts with metal to form salt but acid reacts with metal to form hydrogen can you help me ?

Ans 1:

Kartik Saxena from Mercy Memorial School, Kanpur
Class : Class 7
C Metal reacts with acids

Ans 2:

R k sanjith from New Horizon gurukul , Bangalore
Class : Class 7

Ans 3:

Purvi chadha from Vibgyor high, Bengaluru
Class : Class 7
answer is C

Ans 4:

Shriyam from Chinmaya vidyalaya Bokaro, Bokaro
Class : Class 7
Answer is C as metal react with acid to form salt and hydrogen both

Ans 5:

Kartik Saxena from Mercy Memorial School, Kanpur
Class : Class 7
C Metal reacts with acids

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Arush from Anandi Public School, Udgir
Subject :NSO    Class : Class 7

Ans 1:

Dhruvan G from Indian School Al Ghubra, Muscat
Class : Class 8
It started in '1973', NOT in '1927' you have got your reference wrong. The question says 1974 which is a year wrong so I think they made a mistake while preparing the questions.

Ans 2:

Arush from Anandi Public School, Udgir
Class : Class 3
richa is also wrong as chipko movement started in 1927

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Arush from Anandi Public School, Udgir
Subject :NSO    Class : Class 7

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Sreejith from St.Mary High school, Gajwel Telanagna
Subject :NSO    Class : Class 3

Ans 1:

Iniya from DIMENSIONS International College, Singapore
Class : Class 6

Ans 2:

aarav m from kumarans, bengaluru
Class : Class 3
A

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soham bansal from st.anslem school, alwar
Subject :NSO    Class : Class 10

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krish kasturirangan from P G Garodia , Ghatkopar
Subject :NSO    Class : Class 4

Ans 1:

Vikas Jhamb from Bhawan, Chandigarh
Class : Class 4

Ans 2:

Bushra aslam from uttam, Ghaziabad
Class : Class 8
A is correct answer!.

Ans 3:

ikshika kumar from MVN SCHOOL, FARIDABAD
Class : Class 7
A) Colder, Warmer

Ans 4:

Krisha Saini from GEA, Mumbai
Class : Class 2

Ans 5:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 7

Ans 6:

Rupsa Bhattacharjee from South City International School, Kolkata
Class : Class 5
a

Ans 7:

Student from School, City
Class : Class 8

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Ans 8:

Samarth Vijay Yeliathaya from Shri Kumarans Children home,cbse, Bangalore
Class : Class 5
wierdo

Ans 9:

NEEV SINGH from VISHWA BHARATI PUBLIC SCHOOL, Noida
Class : Class 8

Ans 10:

Tanirika Bansal from DPS Faridabad, Faridabad
Class : Class 4
the correct answer is a

Ans 11:

Abhinha Ajay Ovhal from Podar International School, Latur
Class : Class 6
A)COLDER ,WARMER

Ans 12:

TARA NAUTIYAL from CONVENT OF JESUS AND MARY, DEHRADUN
Class : Class 4
A is the correct answer

Ans 13:

Diya Jasmina from Samsidh MLZS, Bengaluru
Class : Class 4

Ans 14:

Krisha Saini from GEA, Mumbai
Class : Class 2

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UTKARSH SINGHAL from DPS ALIGARH, ALIGARH
Subject :NSO    Class : Class 7

Ans 1:

Ayushman Mohapatra from DAV PUBLIC SCHOOL, Bhubaneswar
Class : Class 7
A

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SATYA SHRIVASTAVA from DOON PUBLIC SHOOL, JHARSUGUDA
Subject :NSO    Class : Class 3

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