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Ishaan ChakrabortyEduRev Class 8 |
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Ishaan Chakraborty
EduRev Class 8
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Top Scoring Tests by Ishaan
Test: Towns, Traders & Craftspersons | 30/40 |
Test: Soil | 55/80 |
Olympiad Test: Practical Geometry | 55/80 |
Important Questions: Understanding Advertising | 50/80 |
Olympiad Test: Perimeter and Area - 1 | 25/40 |
Olympiad Test: Waste Water Story | 50/80 |
Important Questions: The Making of Regional Cultures | 38/60 |
Olympiad Test: Exponents and Powers - 1 | 22/40 |
Olympiad Test: Fibre To Fabric | 45/80 |
Olympiad Test: Weather Climate & Adaptations of Animals to Climate | 45/80 |
Rated 5 
by Ishaan
by Ishaan | L3 : Ratio vs Fraction - Comparing Quantities , Maths, Class 7 Video | 04:01 min |  |
 | NCERT Solutions: The Story of Cricket Doc | 8 pages | |
 | NCERT Solutions: Role of the Government in Health Doc | 1 page | |
 | Growing Up As Boys And Girls? (Overview) Video | 07:24 min | |
 | Chapter Notes: Physical & Chemical Changes Doc | 6 pages | |
 | The Prairies the Grasslands Of Temperate Region Video | 16:38 min | |
 | Introduction Of The Indian Desert Video | 10:51 min | |
 | L6 : Questions 2 : Fraction - Fractions and Decimals , Maths, Class 7 Video | 08:38 min | |
 | NCERT Textbook: Struggles for Equality Doc | 11 pages | |
 | NCERT Textbook: Fractions & Decimals Doc | 24 pages | |
 | NCERT Solutions: Expert Detectives Doc | 4 pages | |
| Chapter 5 - Quality, English, Class 7 Doc | 14 pages | |
 | NCERT Solutions: Transportation in Animals & Plants Doc | 7 pages | |
 | L6 : Linear Pair - Lines and Angles , Maths, Class 7 Video | 08:09 min | |
| NCERT Solutions: The Squirrel Doc | 1 page | |
 | Rocks Cycle And Minerals Video | 11:14 min | |
| NCERT Solutions: Dad and the Cat and the Tree Doc | 2 pages | |
 | NCERT Textbook: Soil Doc | 12 pages | |
 | NCERT Solutions: Simple Equations Doc | 15 pages | |
 | Mughals Timeline Video | 03:05 min | |
 | Groundwater - An Important Source of Water - Water : A Precious Resource - CBSE Class 7 Science Video | 00:43 min | |
 | Reflection of Light - Light - CBSE Class 7 Science Video | 01:56 min | |
 | L11 : Questions: Application of Equation - Simple Equation , Maths, Class 7 Video | 07:17 min | |
| NCERT Solutions: Exponents & Powers- 1 Doc | 10 pages | |
| NCERT Solutions: I Want Something in a Cage Doc | 4 pages | |
 | NCERT Solutions: Bringing Up Kari Doc | 3 pages | |
 | NCERT Textbook: Nutrition in Animals Doc | 13 pages | |
Discussed Questions
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Ishaan Chakraborty upvoted • 2 weeks ago |
What are the factors of x4+2x2+9?
- a)(x2+2x+3), (x2−2x+3)
- b)(x2+3), (x2−3)
- c)(x2+2x+3), (x2+2x+3)
- d)(x2+3), (x2+3)
Correct answer is option 'A'. Can you explain this answer?
What are the factors of x4+2x2+9?
a)
(x2+2x+3), (x2−2x+3)
b)
(x2+3), (x2−3)
c)
(x2+2x+3), (x2+2x+3)
d)
(x2+3), (x2+3)
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Trisha Vashisht answered |
Given equation is x4 + 2x2 + 9
We can rewrite this as,
(x2)2 + 6x2 + 9 − 4x2
⇒ (x2 + 3)2 − (2x)2
....Since a2 + 2ab + b2 = (a+b)2
⇒ x4 + 2x2 + 9 = (x2 − 2x + 3)(x2 + 2x + 3)
....Since a2 − b2 = (a+b)(a−b)
We can rewrite this as,
(x2)2 + 6x2 + 9 − 4x2
⇒ (x2 + 3)2 − (2x)2
....Since a2 + 2ab + b2 = (a+b)2
⇒ x4 + 2x2 + 9 = (x2 − 2x + 3)(x2 + 2x + 3)
....Since a2 − b2 = (a+b)(a−b)
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Ishaan Chakraborty upvoted • Feb 14, 2025 |
Why does the writer describe the ocean as an "unleashed monster"?- a)The ocean appeared dangerous and unpredictable.
- b)The writer had a fear of water and swimming.
- c)The ocean was rough and caused seasickness.
- d)The writer saw it as a symbol of power and freedom.
Correct answer is option 'A'. Can you explain this answer?
Why does the writer describe the ocean as an "unleashed monster"?
a)
The ocean appeared dangerous and unpredictable.
b)
The writer had a fear of water and swimming.
c)
The ocean was rough and caused seasickness.
d)
The writer saw it as a symbol of power and freedom.
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Lakesway Classes answered |
The writer perceives the ocean as an "unleashed monster" because it seemed formidable and potentially threatening during the voyage.
Which fibre is used in making of conveyor belts?
- a)Polyester
- b)Nylon
- c)Rayon
- d)Acrylic
Correct answer is option 'B'. Can you explain this answer?
Which fibre is used in making of conveyor belts?
a)
Polyester
b)
Nylon
c)
Rayon
d)
Acrylic
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Ishaan Chakraborty answered • Feb 10, 2025 |
Introduction to Conveyor Belts
Conveyor belts are essential components in various industries, facilitating the movement of materials and goods. The choice of material for these belts significantly impacts their durability, flexibility, and overall performance.
Why Nylon is Preferred
- Nylon is favored for conveyor belts due to its exceptional properties:
- St... more: Nylon fibers provide high tensile strength, making the belts resistant to wear and tear.
- Flexibility: The elasticity of nylon allows for flexibility, enabling the belts to bend around pulleys and navigate through different pathways without damage.
- Resistance to Abrasion: Nylon's durability ensures it can withstand harsh conditions, including friction and abrasive materials, extending the lifespan of conveyor systems.
- Low Moisture Absorption: Nylon has a low tendency to absorb moisture, which helps maintain its strength and reduces the risk of degradation in humid environments.
Comparison with Other Fibers
- While other fibers like polyester and rayon are used in specific applications, they do not match nylon's overall performance in conveyor belt manufacturing:
- Polyester: Although it has good strength and is resistant to shrinking, it lacks the same level of flexibility as nylon.
- Rayon: This fiber is not as strong or durable as nylon and is more susceptible to moisture damage.
- Acrylic: Primarily used for its lightweight properties, acrylic does not offer the same durability needed for heavy-duty conveyor applications.
Conclusion
In summary, nylon is the superior choice for conveyor belts due to its strength, flexibility, abrasion resistance, and low moisture absorption, making it ideal for a wide range of industrial applications.
Conveyor belts are essential components in various industries, facilitating the movement of materials and goods. The choice of material for these belts significantly impacts their durability, flexibility, and overall performance.
Why Nylon is Preferred
- Nylon is favored for conveyor belts due to its exceptional properties:
- St... more: Nylon fibers provide high tensile strength, making the belts resistant to wear and tear.
- Flexibility: The elasticity of nylon allows for flexibility, enabling the belts to bend around pulleys and navigate through different pathways without damage.
- Resistance to Abrasion: Nylon's durability ensures it can withstand harsh conditions, including friction and abrasive materials, extending the lifespan of conveyor systems.
- Low Moisture Absorption: Nylon has a low tendency to absorb moisture, which helps maintain its strength and reduces the risk of degradation in humid environments.
Comparison with Other Fibers
- While other fibers like polyester and rayon are used in specific applications, they do not match nylon's overall performance in conveyor belt manufacturing:
- Polyester: Although it has good strength and is resistant to shrinking, it lacks the same level of flexibility as nylon.
- Rayon: This fiber is not as strong or durable as nylon and is more susceptible to moisture damage.
- Acrylic: Primarily used for its lightweight properties, acrylic does not offer the same durability needed for heavy-duty conveyor applications.
Conclusion
In summary, nylon is the superior choice for conveyor belts due to its strength, flexibility, abrasion resistance, and low moisture absorption, making it ideal for a wide range of industrial applications.
The central dome of the Viceroy’s Palace was copied from the Mughal architecture.- a)True
- b)False
Correct answer is option 'B'. Can you explain this answer?
The central dome of the Viceroy’s Palace was copied from the Mughal architecture.
a)
True
b)
False
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Ishaan Chakraborty answered • Feb 10, 2025 |
Introduction
The Viceroy's Palace, now known as the Rashtrapati Bhavan, is an important historical building in India. Its architectural style has often been a topic of discussion, particularly regarding its dome.
Influence of Mughal Architecture
- The central dome of the Viceroy's Palace is not a direct copy of Mughal architecture. While it does incorporate elements in... more
The Viceroy's Palace, now known as the Rashtrapati Bhavan, is an important historical building in India. Its architectural style has often been a topic of discussion, particularly regarding its dome.
Influence of Mughal Architecture
- The central dome of the Viceroy's Palace is not a direct copy of Mughal architecture. While it does incorporate elements in... more
Teacher: "don't cheat in the exam!"Convert the given sentence into indirect speech.- a)The teacher said that I should not cheat in the exam.
- b)The teacher told me that I should not do cheating in the exam.
- c)The teacher told me not to cheat in the exam.
- d)The teacher said that I am not going to cheat in the exam.
Correct answer is option 'C'. Can you explain this answer?
Teacher: "don't cheat in the exam!"
Convert the given sentence into indirect speech.
a)
The teacher said that I should not cheat in the exam.
b)
The teacher told me that I should not do cheating in the exam.
c)
The teacher told me not to cheat in the exam.
d)
The teacher said that I am not going to cheat in the exam.
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Ishaan Chakraborty answered • Feb 10, 2025 |
Understanding Indirect Speech
Indirect speech, also known as reported speech, is used to convey what someone else has said without quoting their exact words. It often involves changes in pronouns, verb tenses, and sometimes the structure of the sentence.
Analysis of the Options
When converting direct speech to indirect speech, we need to maintain the original meaning w... more
Indirect speech, also known as reported speech, is used to convey what someone else has said without quoting their exact words. It often involves changes in pronouns, verb tenses, and sometimes the structure of the sentence.
Analysis of the Options
When converting direct speech to indirect speech, we need to maintain the original meaning w... more
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Ishaan Chakraborty upvoted • Jan 13, 2025 |
Which of the following is divisible by 12?
- a)284382
- b)624876
- c)926248
- d)746174
Correct answer is option 'B'. Can you explain this answer?
Which of the following is divisible by 12?
a)
284382
b)
624876
c)
926248
d)
746174
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C K Academy answered |
If the number is divisible by both 3 and 4, then the number is divisible by 12 exactly.
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Ishaan Chakraborty upvoted • Oct 26, 2024 |
The British carried out detailed surveys by the early 19th century in order to map the entire country.- a)True
- b)False
Correct answer is option 'A'. Can you explain this answer?
The British carried out detailed surveys by the early 19th century in order to map the entire country.
a)
True
b)
False
|
Dr Manju Sen answered |
Answer:
The statement "The British carried out detailed surveys by the early 19th century in order to map the entire country" is true. Here's a detailed explanation:
- In the early 19th century, the British government initiated a comprehensive survey of the entire country to create detailed maps.
- The survey was known as the Ordnance Survey and aimed to map the topography, boundaries, and landmarks of Britain.
- The Ordnance Survey was established in 1791, and by the early 19th century, it had made significant progress in mapping various regions.
- The surveys conducted by the Ordnance Survey involved detailed measurements and observations, including trigonometric calculations and the use of precision instruments.
- The resulting maps were highly accurate and provided valuable information for military, administrative, and commercial purposes.
- The Ordnance Survey's mapping efforts played a crucial role in various fields, such as urban planning, transportation, land use, and resource management.
- The survey work continued throughout the 19th century and beyond, leading to the production of highly detailed maps covering the entire country.
- Today, the maps produced by the Ordnance Survey are still widely used and regarded as some of the most accurate and comprehensive maps available for Great Britain.
Overall, the British carried out detailed surveys by the early 19th century to map the entire country through the establishment of the Ordnance Survey.
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Ishaan Chakraborty upvoted • Sep 29, 2024 |
How would you describe the other boy?- a) Little older than Ranji
- b) Taller than Ranji
- c) Thickset
- d) All of the Above
Correct answer is option 'D'. Can you explain this answer?
How would you describe the other boy?
a)
Little older than Ranji
b)
Taller than Ranji
c)
Thickset
d)
All of the Above
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Advait Saha answered |
The other boy was little older and taller than Rajni and as thickest.
(−4) × (−3) × (−2) = _______- a)24
- b)-9
- c)9
- d)-24
Correct answer is option 'D'. Can you explain this answer?
(−4) × (−3) × (−2) = _______
a)
24
b)
-9
c)
9
d)
-24
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Ishaan Chakraborty answered • Feb 03, 2020 |
(−4) × (−3) × (−2) = - 4 x 6 = -24
So option D is correct answer
(17)3.5 × (17)? = 178- a)2.29
- b)2.75
- c)4.25
- d)4.5
Correct answer is option 'D'. Can you explain this answer?
(17)3.5 × (17)? = 178
a)
2.29
b)
2.75
c)
4.25
d)
4.5
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Ishaan Chakraborty answered • Jan 27, 2020 |
Let (17)^3.5 � (17)^x = 17^8
Then, (17)^3.5 + x = 17^8
∴ 3.5 + x = 8
⇒ x = (8 - 3.5)
⇒ x = 4.5
An ordinary pack of 52 cards is well shuffled. The top card is then turned over. What is the probability (a) the top card will be a red card (b) the top card is a number card?
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Ishaan Chakraborty answered • Jan 06, 2020 |
1. red cards is 13 so 13/52
2.the number of card is 9*4= 36 is 36/52= 9/13
3.the top card will be black picture card 26/52=1/2
In a certain code, CALANDER is written as CLANAEDR. How is CIRCULAR written in that code?- a)CRIUCLRA
- b)ICRCLUAR
- c)CRIUCALR
- d)ICCRLURA
Correct answer is option 'C'. Can you explain this answer?
In a certain code, CALANDER is written as CLANAEDR. How is CIRCULAR written in that code?
a)
CRIUCLRA
b)
ICRCLUAR
c)
CRIUCALR
d)
ICCRLURA
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Ishaan Chakraborty answered • Dec 20, 2019 |
For question it is clear that, the second and third letters, fourth and fifth letters, sixth and seventh letters of the word mutually interchange positions to form the code.
So
C ⇒ C
I ⇘ R
R ⇗ I
C ⇘ U
U ⇗ C
L ⇘ A
A ⇗ L
R ⇒ R
so the code for CIRCULAR is CRIUCALR
Direction: Find the odd man out.
196, 169, 144, 121, 100, 80, 64- a)169
- b)143
- c)144
- d)80
Correct answer is option 'D'. Can you explain this answer?
Direction: Find the odd man out.
196, 169, 144, 121, 100, 80, 64
196, 169, 144, 121, 100, 80, 64
a)
169
b)
143
c)
144
d)
80
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Ishaan Chakraborty answered • Dec 19, 2019 |
Numbers must be (14)^2, (13)^2, (12)^2, (11)^2, (10)^2, (9)^2, (8)^2.
So, 80 is wrong.
?
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Ishaan Chakraborty answered • Dec 18, 2019 |
An electric bell is a mechanical bell that functions by means of an electromagnet. When an electric current is applied, it produces a repetitive buzzing or clanging sound.
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Ishaan Chakraborty asked • Nov 13, 2019 |
The seeds of ______ fruit are dry and dispersed by explosion due to the touch of our hands.- a)cucumber
- b)xanthium
- c)balsam
- d)calotropis
Correct answer is option 'C'. Can you explain this answer?
The seeds of ______ fruit are dry and dispersed by explosion due to the touch of our hands.
a)
cucumber
b)
xanthium
c)
balsam
d)
calotropis
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Rajesh Jain answered |
The seeds of balsam fruit are dry and dispersed by explosion due to the touch of our hands. The walls of the fruit coil inwards, creating forces that throws the seeds to a distance.
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Ishaan Chakraborty asked • Nov 09, 2019 |
Directions: Each of these questions given below contains three elements. These elements may or may not have some inter linkage. Each group of elements may fit into one of these diagrams at (a), (b), (c), (d). You have to indicate the group of elements which correctly fits into the diagrams.Q. Which of the following diagrams indicates the best relation among Factory, Product and Machinery?- a)
- b)
- c)
- d)
Correct answer is option 'D'. Can you explain this answer?
Directions: Each of these questions given below contains three elements. These elements may or may not have some inter linkage. Each group of elements may fit into one of these diagrams at (a), (b), (c), (d). You have to indicate the group of elements which correctly fits into the diagrams.
Q. Which of the following diagrams indicates the best relation among Factory, Product and Machinery?
a)
b)
c)
d)
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Mahesh Sen answered |
Product and Machinery are different from each other but both are found in Factory.
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Ishaan Chakraborty asked • Nov 06, 2019 |
Choose the word which is different from the rest.- a)Kiwi
- b)Eagle
- c)Emu
- d)Ostrich
Correct answer is option 'B'. Can you explain this answer?
Choose the word which is different from the rest.
a)
Kiwi
b)
Eagle
c)
Emu
d)
Ostrich
|
Amit Sharma answered |
All except Eagle are flightless birds.
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Ishaan Chakraborty asked • Nov 03, 2019 |
In each of the following letter series, some of the letters are missing, which are given in such order as one of the alternatives below it. Choose the correct alternative.
Q. ab __ d __ aaba __ na _ badna _ b- a)andaa
- b)babda
- c)badna
- d)dbanb
Correct answer is option 'A'. Can you explain this answer?
In each of the following letter series, some of the letters are missing, which are given in such order as one of the alternatives below it. Choose the correct alternative.
Q. ab __ d __ aaba __ na _ badna _ b
Q. ab __ d __ aaba __ na _ badna _ b
a)
andaa
b)
babda
c)
badna
d)
dbanb
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Advait Pillai answered |
The series is abadna/abadna/abadna/ab. Thus, the pattern 'abadna' is repeated.
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Ishaan Chakraborty asked • Oct 30, 2019 |
Find the value of:
- a)
- b)
- c)
- d)
Correct answer is option 'A'. Can you explain this answer?
Find the value of:
a)
b)
c)
d)
|
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Ananya Das answered |
look carefully it is written in a specific pattern using a3+b3
Given Expression =
Given Expression =
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Ishaan Chakraborty asked • Oct 23, 2019 |
Direction: In each of the following questions, an alphabet series is given with one missing term. Choose correct alternative that will continue the same pattern and fill in the blank spaces.
CMM, EOO, GQQ, _____, KUU- a)GRR
- b)GSS
- c)ISS
- d)ITT
Correct answer is option 'C'. Can you explain this answer?
Direction: In each of the following questions, an alphabet series is given with one missing term. Choose correct alternative that will continue the same pattern and fill in the blank spaces.
CMM, EOO, GQQ, _____, KUU
CMM, EOO, GQQ, _____, KUU
a)
GRR
b)
GSS
c)
ISS
d)
ITT
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Snehal Basak answered |
The first letters are in alphabetical order with a letter skipped in between each segment: C, E, G, I, K. The second and third letters are repeated; they are also in order with a skipped letter: M, O, Q, S, U.
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Ishaan Chakraborty asked • Oct 19, 2019 |
If the word PORTER can be coded as MBNZQN. How can REPORT be written?- a)NQBMNZ
- b)NQMNBZ
- c)NBQMNZ
- d)NQMBNZ
Correct answer is option 'D'. Can you explain this answer?
If the word PORTER can be coded as MBNZQN. How can REPORT be written?
a)
NQBMNZ
b)
NQMNBZ
c)
NBQMNZ
d)
NQMBNZ
|
Nitin Patel answered |
The word REPORT can be written as NQMBNZ.
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Ishaan Chakraborty asked • Oct 16, 2019 |
The compound interest on a certain sum for 2 years at 10% per annum is Rs 525. The simple interest on the same sum for double the time at half the rate percent per annum is:- a)Rs 400
- b)Rs 500
- c)Rs 600
- d)Rs 800
Correct answer is option 'B'. Can you explain this answer?
The compound interest on a certain sum for 2 years at 10% per annum is Rs 525. The simple interest on the same sum for double the time at half the rate percent per annum is:
a)
Rs 400
b)
Rs 500
c)
Rs 600
d)
Rs 800
|
Tanishq Kulkarni answered |
Let the sum be Rs P.
Then, [P (1 + 10/100)2 – P] = 525
P = (11/10)2 – 1 = 525
P = (525 × 100)/21 = 2500
Therefore, sum = Rs 2500
S.I. = (2500 × 5 × 4)/100 = Rs 500
Then, [P (1 + 10/100)2 – P] = 525
P = (11/10)2 – 1 = 525
P = (525 × 100)/21 = 2500
Therefore, sum = Rs 2500
S.I. = (2500 × 5 × 4)/100 = Rs 500
If P + Q means P is the brother of Q; P × Q means P is the wife of Q, and P % Q means P is the daughter of Q, then which of the following means D is the uncle of A?- a)A % B × C + D
- b)A × B + C % D
- c)A + C % B × D
- d)None of these
Correct answer is option 'D'. Can you explain this answer?
If P + Q means P is the brother of Q; P × Q means P is the wife of Q, and P % Q means P is the daughter of Q, then which of the following means D is the uncle of A?
a)
A % B × C + D
b)
A × B + C % D
c)
A + C % B × D
d)
None of these
|
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Ishaan Chakraborty answered • Oct 15, 2019 |
None of these can be the correct option.
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Ishaan Chakraborty asked • Oct 12, 2019 |
Direction: In each problem, out of the five figures marked (1), (2), (3), (4) and (5), four are similar in a certain manner. However, one figure is not like the other four.
Q. Choose the figure which is different from the rest.
- a)1
- b)2
- c)3
- d)4
- e)5
Correct answer is option 'A'. Can you explain this answer?
Direction: In each problem, out of the five figures marked (1), (2), (3), (4) and (5), four are similar in a certain manner. However, one figure is not like the other four.
Q. Choose the figure which is different from the rest.
Q. Choose the figure which is different from the rest.
a)
1
b)
2
c)
3
d)
4
e)
5
|
Nabanita Patel answered |
All other figures can be rotated into each other.
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