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param ahuja from m.p.s, Ajmer
Subject :NSO    Class : Class 7

Ans 1:

Atharva Shrikhande from Euro School, Pune
Class : Class 9
both options "C" and "D" are correct in my opinion cause as the car is moving at a constant speed there is no acceleration and as the car is being ridden on a straight road direction of movement also does not change, Hence proving that both option "C" and "D" are correct. I hope my answer was helpful. A very Happy New Year to all

Ans 2:

Shuvangi Das from Vivekananda mission school, haldia
Class : Class 9
Both C and D I prefer. SOF pls check

Ans 3:

Rithvik from BVM Global, Chennai
Class : Class 8
c and d

Ans 4:

Manu Dagur from Rukmani Birla Modern High School, Jaipur, JAIPUR
Class : Class 10
D as it is mentioned that the particle is travelling at a constant speed

Ans 5:

Hamsavarshini Swaminathan from St Anns Senior Secondary School, Roorkee
Class : Class 10
not c i think

Ans 6:

RAHUL S ROY from ST.XAVIERS HIGH SCHOOL,VAPI, VAPI,GUJARAT
Class : Class 7
option c is correct as acceleration means change of speed

Ans 7:

RAHUL S ROY from ST.XAVIERS HIGH SCHOOL,VAPI, VAPI,GUJARAT
Class : Class 7
option c is correct

Ans 8:

Venya Vikas from Chirec International , Hyderabad
Class : Class 7
Both option C and option D are correct as since it is moving in constant speed, it's acceleration will be zero and the direction will not change as it was not mentioned and the particle is travelling on a straight road

Ans 9:

govindkrishnan p from KENDRIYA VIDYLAYA PAYYANUR, PAYYANUR
Class : Class 7
Both 'C' and 'D' are correct

Ans 10:

Ashwak from Cambridge, Jalandhar
Class : Class 8
Both C and D are correct

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param ahuja from m.p.s, Ajmer
Subject :NSO    Class : Class 7

Ans 1:

Anshuman D from MVM, Hyderabad
Class : Class 9
I am not able to understand it

Ans 2:

NIKHIL RANJAN from Litera Valley School, PATNA
Class : Class 7
Here the properties of lines and angles will be applied.Then the laws of reflection

Ans 3:

Ridhima Sahu from Bal Bharati Public School , Navi Mumbai
Class : Class 7
Answer is (a). This is observed due to this reasonThere's a line which is making an angle 55° and is a linear pair. Hence the angle of line (mirror) p is 180°. But 55° is not the angle of incidence. To get the sum of angle of incidence and reflection, we multiply 55° by 2 and get 70°. Since angle of incidence =angle of reflection, 70°÷2=35°. The angle of incident ray and the reflected ray of P and Q are same thus the sum of the angle of incidence and angle of reflection would be the same (70°). We know, angle of incidence=angle of reflection, hence 70°÷2=35°. Or A=35°

Ans 4:

NIKHIL RANJAN from Litera Valley School, PATNA
Class : Class 7
The correct is C

Ans 5: (Master Answer)

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

Ans 6:

Anshuman D from MVM, Hyderabad
Class : Class 9
I actually don't get the logic behind it

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param ahuja from m.p.s, Ajmer
Subject :NSO    Class : Class 7

Ans 1:

Tanush Rao from Delhi Public School Vasant Kunj, Delhi
Class : Class 8

Ans 2:

siddarth from DPS Ecity, Bengaluru
Class : Class 8
ans= c

Ans 3:

Miheet parikh from Jamnabai narsee school, Mumbai
Class : Class 8
A

Ans 4:

NIKHIL RANJAN from Litera Valley School, PATNA
Class : Class 7
0hi hi hih h hi hi hi hii

Ans 5:

Jai kumar Bohara from Dps, Udaipur
Class : Class 9
yes ans c

Ans 6:

Om Goel from Ryan International School, New Delhi
Class : Class 9
the answer should be B because cocave lens is a diverging lens which will diverge the light to all parts of the room

Ans 7:

Md.ZEESHAN ali from St. Agness branch school, Kharagpur
Class : Class 4
yes according to me also the answer is c but in nso practice papers it is written as d

Ans 8:

Sanjay Kumar from Vellammal Vidyashram, Chennai
Class : Class 5
Ans c

Ans 9:

ALICE from Delhi Public School, UDAIPUR
Class : Class 8

Ans 10:

NIKHIL RANJAN from Litera Valley School, PATNA
Class : Class 7
The correct answer is D.

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priyanshi gupta from opg world school , delhi
Subject :NSO    Class : Class 4

Ans 1:

Arnav kaul from Chirec, Hyderabad
Class : Class 2

Ans 2:

Vihaan Nair from Ambassador School, DUBAI
Class : Class 6
I think B and D is correct.

Ans 3:

Ridhan from SFS janakpuri, New Delhi
Class : Class 5
the answer is d

Ans 4:

LAVANYA DADHWAL from BLOOM PUBLIC SCHOOL, South West Delhi
Class : Class 7
D is correct

Ans 5:

Pankaj Rajput from RBK GLOBAL SCHOOL, THANE
Class : Class 4

Ans 6:

PARTH PANCHAL from NEW HORIZON SCHOLARS SCHOOL, THANE
Class : Class 7
yes you are right

Ans 7:

Jithisha Barapati from Dimensions, Hyderabad
Class : Class 4
D is correct

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SHAURYA RAJ from LITERA VALLEY SCHOOL, PATNA
Subject :NSO    Class : Class 3

Ans 1:

Sagnik Roy from Nava Nalanda Santiniketan Shakha, Bolpur
Class : Class 8
C

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ADVAITH KRISHNAN from SHISHUKUNJ INTERNATIONAL SCHOOL, INDORE
Subject :NSO    Class : Class 7

Which of the following statements are correct?
I. The tangy taste of cola drinks is due to carbonic acid which is an organic acid.
II. Inorganic acids are prepared artificially in the industries and are extremely corrosive.
III. Hydrochloric acid reacts with metals to varying degrees therefore, it is stored in glass bottles.
IV. Organic acids are weak acids and are used as food supplements.

A I, II and III only
B I and IV only
C II and IV only
D All of these


Why is carbonic acid inorganic even though all organic acids have carbon in their formulae and H2CO3 is the formula of carbonic acid?

Ans 1:

Chaitanya L K from SKCHEC, bangalore
Class : Class 8
hcl reacts with metals too

Ans 2:

Ashwak from Cambridge, Jalandhar
Class : Class 8
Hydrocloric acid is very corrosive and reacts with metals . So HCL is stored in glass bottles because it dont causes damage to it . ..........SO 3 statement should be true and their explanation is wrong .

Ans 3:

Aditya Sai Vemparala from Amanora school, Pune
Class : Class 10
Hcl reacts with metals also

Ans 4:

Aryan Keswani from Delhi Public School, Mathura Road, New Delhi
Class : Class 10
Hcl doesen't react with metals......Sulphuric acid does

Ans 5:

Rudraksh Mittal from JAYPEE PUBLIC SCHOOL, NOIDA, NOIDA
Class : Class 10
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC

Ans 6:

Ankush Ghosh from DPS, Doha
Class : Class 10
Hcl doesnt react with glass. The explanation is wrong

Ans 7:

Ahan Biswas from National Public School, Bangalore
Class : Class 8
Hydrochloric acid reacts with metals and corrodes them and is therefore stored in glass bottles... This question is wrong and so is the explanation.

Ans 8:

Tejas Agarwal from Amity International School , Noida
Class : Class 7
Q is wrong since option 1 is false, rest all are true

Ans 9:

Akshay Jha from DPS NERUL, Navi Mumbai
Class : Class 7
Yes, I also agree. HCl is a strong acid and reacts with metals almost exactly like H2S04, it is also stored in glass for this reason, question is wrong.

Ans 10:

Aarnavi Mann from Scholars rosary Sr. Sec. School, Rohtak
Class : Class 8
Inorganic acids such as minerals acid like HCL , H2SO4 etc . Are. Not always made in factories . HCL is produced in our stomach.

Ans 11:

Akshara from NPS, Bengaluru
Class : Class 8
I completely agree... The HCl reacts with metals , which is major reason of why HCl is stored in glass bottles..

Ans 12:

dhairya mittal from vidyashram international school jodhpur, Jodhpur
Class : Class 5
You all are correct

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Anhiti Mandal from Shri Ram School, Gurgaon
Subject :NSO    Class : Class 7

Ans 1:

Amol Athawale from WoodRidge High, aurangabad
Class : Class 6
i gave the correct answer but in the result they are showing that it is wrong.it is the same case with some other questions too.Please make a note that you correct it,thank you.

Ans 2:

Amol Athawale from WoodRidge High, aurangabad
Class : Class 6

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A Ramakrishna Rao from D A V Public School. Unit 8. Bhubaneswar , Bhubaneswar
Subject :NSO    Class : Class 5

Ans 1:

siri from Vibgyor, Bangalore
Class : Class 5
according to Google stapler is a third-class lever

Ans 2:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 7
Stapler ( option D ) is the odd one out as it is a third class lever i.e. effort is between the load and fulcrum .

Ans 3:

Niveideeta Cour from Suncity World School, Gurgaon
Class : Class 5
yes because the stapler is a third class lever

Ans 4:

Kavin Karthick M from DPS bangalore east, Bengaluru
Class : Class 6
option D is correct because stapler is 3rd class lever

Ans 5:

SARVESH RAMESH from DPS MIS, QATAR
Class : Class 8

Ans 6:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 7

Ans 7:

Rounak J from Silver Oaks School , Hyderabad
Class : Class 8
D

Ans 8:

Shruthi from VIBGYOR, Mumbai
Class : Class 6
What is type of Option A?

Ans 9:

Niveideeta Cour from Suncity World School, Gurgaon
Class : Class 5

Ans 10:

Rohan David from Oakridge International school, Hyderabad
Class : Class 7
The answer is D because the stapler is the odd one out

Ans 11:

D Murari from Indian School of Excellence, Bangalore
Class : Class 9

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Sarthak yadav from RPS, Mahendragarh
Subject :NSO    Class : Class 4

Ans 1:

shibin joseph from ,
Class : Class 3

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M.MEYYAPPAN from DPS, Bhilai
Subject :NSO    Class : Class 8

Ans 1:

PARTH JAIN from DPS INDIRAPURAM, GHAZIABAD
Class : Class 8

Ans 2:

aditya arora from Heritage Experiential Learning School, gurugram
Class : Class 8
A

Ans 3:

SpaceXX from indian school sohar, Muscat
Class : Class 9
The correct answer is B because manure is soluble in water but it is absorbed very slowly

Ans 4: (Master Answer)

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

Ans 5:

Arnav Diwan from F.A.I.P.S Kuwait, Kuwait
Class : Class 10
it is A as fertilizers are soluble in water. You might have heard that fertilizers flow into the river and cause eutrophication it flows into river because it is soluble in water

Ans 6:

kd from st Jude's academy , sonipay
Class : Class 8
A

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