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All questions of April Week 1 for NEET Exam
Can you explain the answer of this question belowOne of the following functions is exhibited only by green plants and not by animals.A: GrowthB: PhotosynthesisC: DigestionD: ResponseThe answer is b.
One of the following functions is exhibited only by green plants and not by animals.
A: Growth
B: Photosynthesis
C: Digestion
D: Response
|
Mira Joshi answered |
- Photosynthesis is a biochemical process of the synthesis of glucose using light energy. The process of photosynthesis occurs in chloroplast.
- As only green plants have chloroplast hence photosynthesis can occur only in green parts of the plant.
Hence, the corret option is B i.e. Photosynthesis.
Which among the following is not a code of nomenclature for organisms?
- a)International Union of Pure and Applied Chemistry (IUPAC)
- b)International Code of Bacteriological Nomenclature (ICBN)
- c)International Code of Zoological Nomenclature (ICZN)
- d)International Code of Botanical Nomenclature (ICBN)
Correct answer is option 'A'. Can you explain this answer?
Which among the following is not a code of nomenclature for organisms?
a)
International Union of Pure and Applied Chemistry (IUPAC)
b)
International Code of Bacteriological Nomenclature (ICBN)
c)
International Code of Zoological Nomenclature (ICZN)
d)
International Code of Botanical Nomenclature (ICBN)
|
Sanchita Chakraborty answered |
International Union of Pure and Applied Chemistry is for the nomenclature of organic compounds.
- International Code of Botanical Nomenclature (ICBN)
- International Code of Bacteriological Nomenclature (ICBN) and
- International Code of Zoological Nomenclature (ICZN)
These are the three codes of nomenclature for living organisms.
Can you explain the answer of this question below:The biologist who has been called the ‘Darwin of the 20th century’ isA: WhittakerB: DienerC: Ernst MayrD: LinnaeusThe answer is c.
|
Preeti Khanna answered |
- Ernst Mayr was a German-born American who made decisive and groundbreaking contributions to avian taxonomy, evolution and population genetics.
- Widely credited as the world's greatest evolutionary biologist in history, Mayr was fondly called the “Darwin of the 20th century”.
Hence, the correct option is C i.e. Ernst Mayr.
Identify the incorrect statement:
- a)Biological names are generally in Latin and written in italics. They are Latinised or derived from Latin irrespective of their origin.
- b)The first word in a biological name represents the genus while the second component denotes the specific epithet.
- c)Both the words in a biological name, when handwritten, are seperately underlined, or printed in italics to indicate their vernacular origin.
- d)The first word denoting the genus starts with a capital letter while the specific epithet starts with a small letter.
Correct answer is option 'C'. Can you explain this answer?
Identify the incorrect statement:
a)
Biological names are generally in Latin and written in italics. They are Latinised or derived from Latin irrespective of their origin.
b)
The first word in a biological name represents the genus while the second component denotes the specific epithet.
c)
Both the words in a biological name, when handwritten, are seperately underlined, or printed in italics to indicate their vernacular origin.
d)
The first word denoting the genus starts with a capital letter while the specific epithet starts with a small letter.
|
Shreya Menon answered |
Explanation:
In the context of biological names, statement 3 is incorrect. When handwritten, biological names are typically underlined, not separately, but as a whole to indicate their vernacular origin. When printed, biological names are usually written in italics. Underlining individual words in a biological name is not a standard practice.
The correct practice is to underline the entire biological name when handwritten or italicize it when printed.
Therefore, the correct answer is 3. Both the words in a biological name, when handwritten, are not separately underlined, or printed in italics to indicate their vernacular origin.
Can you explain the answer of this question below:The maintenance of constant temperature inside the body is an example ofA:HomoeostasisB:Negative feedback loopC:Both A and BD:None of theseThe answer is a.
|
Anjali Iyer answered |
Homeostasis is how the body keeps conditions inside it the same. Scientists describe it as the maintenance of a constant internal environment. Two examples of things that the body keeps the same are: body temperature at 37degC.
The book 'Systema Nature' was written by:- a)Linnaeus
- b)Haeckel
- c)Whittaker
- d)Robert Brown
Correct answer is option 'A'. Can you explain this answer?
The book 'Systema Nature' was written by:
a)
Linnaeus
b)
Haeckel
c)
Whittaker
d)
Robert Brown
|
Swati Verma answered |
- The book ‘Systema Naturae’ was written by Carolus Linnaeus in 1735. The book marked the beginning of zoological nomenclature.
- Carl Linnaeus is known as the “Father of Modern Taxonomy”.
- In his book “Systema Naturae” (1735), he gave the hierarchical system of classification of the natural world into the plant kingdom, the animal kingdom and mineral kingdom.
A group of interbreeding organisms is called a- a)Genus
- b)Species
- c)Family
- d)Order
Correct answer is option 'B'. Can you explain this answer?
A group of interbreeding organisms is called a
a)
Genus
b)
Species
c)
Family
d)
Order
|
|
Nandini Patel answered |
Species - A group of organisms that interbreed and produce fertile offspring. population - A group of organisms of the same species living in the same area at the same time, and which are capable of interbreeding. community - A group of populations living and interacting with each other in a common habitat.
Binomial nomenclature was given byA: TheophrastusB: LinnaeusC: R. H. WhittakerD: AristotleThe correct answer is b.
Can you explain this?
Can you explain this?
|
Vijay Bansal answered |
Binomial Nomenclature was formly introduced by Swedish scientist Carl Linnaeus. In the binomial Nomenclature two terms are used to debote a species of living organisms, the first one indicate the genus and second one the specific epihet.Example:-Homo sapiens is the scientific name of human.
The branch connected with nomenclature, identification and classification is- a)Ecology
- b)Taxonomy
- c)Physiology
- d)Morphology
Correct answer is option 'B'. Can you explain this answer?
The branch connected with nomenclature, identification and classification is
a)
Ecology
b)
Taxonomy
c)
Physiology
d)
Morphology
|
|
Anita Menon answered |
Taxonomy is the practice of identifying different organisms, classifying them into categories and naming them.
So, the first step in taxonomy would be identification.
We would first identify the organisms, classify them, note down their characteristics and then give the scientific names.
So, the correct order would be-
- Identification
- Classification
- Characterization
- Nomenclature
The SI unit of length is the meter. Suppose we adopt a new unit of length which equals to x meters. The area 1m2 expressed in terms of the new unit has a magnitude-- a)x
- b)x2
- c)
- d)
Correct answer is option 'D'. Can you explain this answer?
The SI unit of length is the meter. Suppose we adopt a new unit of length which equals to x meters. The area 1m2 expressed in terms of the new unit has a magnitude-
a)
x
b)
x2
c)
d)
|
Trisha Vashisht answered |
We have 1 unit = x meters
So 1 unit2 = x2 meter2
Hence, we get 1 meter2 = 1/x2 unit2
So 1 unit2 = x2 meter2
Hence, we get 1 meter2 = 1/x2 unit2
One of the following functions is exhibited only by green plants and not by animals.- a)Growth
- b)Photosynthesis
- c)Digestion
- d)Response
Correct answer is option 'B'. Can you explain this answer?
One of the following functions is exhibited only by green plants and not by animals.
a)
Growth
b)
Photosynthesis
c)
Digestion
d)
Response
|
Om Desai answered |
- Photosynthesis is a biochemical process of the synthesis of glucose using light energy. The process of photosynthesis occurs in chloroplasts.
- As only green plants have chloroplasts hence photosynthesis can occur only in green parts of the plant.
Hence, the corret option is B i.e. Photosynthesis.
PARSEC is a unit of- a)Time
- b)Angle
- c)Distance
- d)Velocity
Correct answer is option 'C'. Can you explain this answer?
PARSEC is a unit of
a)
Time
b)
Angle
c)
Distance
d)
Velocity
|
Raghav Bansal answered |
The parsec (symbol: pc) is a unit of length used to measure large distances to astronomical objects outside the Solar System. A parsec is defined as the distance at which one astronomical unit subtends an angle of one arcsecond, which corresponds to 648000π astronomical units.
Light year is the unit of- a)Speed
- b)Mass
- c)Distance
- d)Time
Correct answer is option 'C'. Can you explain this answer?
Light year is the unit of
a)
Speed
b)
Mass
c)
Distance
d)
Time
|
|
Pooja Shah answered |
The light-year is a unit of length used to express astronomical distances and measures about 9.46 trillion kilometres or 5.88 trillion miles. As defined by the International Astronomical Union, a light-year is the distance that light travels in vacuum in one Julian year.
All living organisms are capable of - a)Reproduction and Photosynthesis
- b)Locomotion and Respiration
- c)Excretion and Locomotion
- d)Respiration and Excretion
Correct answer is option 'D'. Can you explain this answer?
All living organisms are capable of
a)
Reproduction and Photosynthesis
b)
Locomotion and Respiration
c)
Excretion and Locomotion
d)
Respiration and Excretion
|
Dev Patel answered |
All living organisms respire and excrete. Locomotion is movement of an organism from one place to another. Plants cannot locomotate.
KIO3 reacts with KI to liberate iodine and liberated Iodine is titrated with standard hypo solution, The reactions are1. I03– + I– →I2 (valency factor = 5/3)2. I2 + S2032– → S4062– + I– (valency factor = 2)meq of hypo = meq of I2 = meq of I03– + meq of I–I03– react with I– ⇒ meq of I03– = meq of I–Statement-1 : meq of hypo = 2 x meq of I03–Statement-2 : valency factor of I2 in both the equation are different therefore we cannot equate milliequivalents in sequence- a)Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-2.
- b)Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-2.
- c)Statement-2 is True, Statement-2 is False.
- d)Statement-1 is False, Statement-2 is True.
Correct answer is option 'A'. Can you explain this answer?
KIO3 reacts with KI to liberate iodine and liberated Iodine is titrated with standard hypo solution, The reactions are
1. I03– + I– →I2 (valency factor = 5/3)
2. I2 + S2032– → S4062– + I– (valency factor = 2)
meq of hypo = meq of I2 = meq of I03– + meq of I–
I03– react with I– ⇒ meq of I03– = meq of I–
Statement-1 : meq of hypo = 2 x meq of I03–
Statement-2 : valency factor of I2 in both the equation are different therefore we cannot equate milliequivalents in sequence
a)
Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-2.
b)
Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-2.
c)
Statement-2 is True, Statement-2 is False.
d)
Statement-1 is False, Statement-2 is True.
|
|
Krishna Iyer answered |
The correct answer is option A
Milliequivalent of IO3− is equal to milliequivalent of I−.
Milliequivalent of hypo is equal to milliequivalent of IO3− plus milliequivalent of I−.
The milliequivalent of hypo is twice the milliequivalent of IO3−. It is also twice the milliequivalent of I−.
Milliequivalent of IO3− is equal to milliequivalent of I−.
Milliequivalent of hypo is equal to milliequivalent of IO3− plus milliequivalent of I−.
The milliequivalent of hypo is twice the milliequivalent of IO3−. It is also twice the milliequivalent of I−.
The following equations are balanced atomwise and chargewise.(i) Cr2O72- + 8H+ + 2H202 → 2Cr3+ + 7H20 + 202(ii) Cr2072- + 8H+ + 5H202→ 2Cr3+ + 9H20 + 402(iii) Cr2072- + 8H+ + 7H202→ 2Cr+ + 11H20 + 502The precise equationlequations representing the oxidation of H202 is/are- a)(i) only
- b)(ii) only
- c)(iii) only
- d)all the three
Correct answer is option 'A'. Can you explain this answer?
The following equations are balanced atomwise and chargewise.
(i) Cr2O72- + 8H+ + 2H202 → 2Cr3+ + 7H20 + 202
(ii) Cr2072- + 8H+ + 5H202→ 2Cr3+ + 9H20 + 402
(iii) Cr2072- + 8H+ + 7H202→ 2Cr+ + 11H20 + 502
The precise equationlequations representing the oxidation of H202 is/are
a)
(i) only
b)
(ii) only
c)
(iii) only
d)
all the three
|
|
Krishna Iyer answered |
The correct answer is option A
Cr2O72- converts into Cr3+ in acidic medium I.e. in H+ medium.
First balance the Cr atom on both sides and then Oxygen atom. H+ is in excess due to acidic medium.
Add H+ as +ve charge to balance the charge on both sides.
Cr2O72- converts into Cr3+ in acidic medium I.e. in H+ medium.
First balance the Cr atom on both sides and then Oxygen atom. H+ is in excess due to acidic medium.
Add H+ as +ve charge to balance the charge on both sides.
Which of the following statement is wrong ?
- a)Unit of K.E. is Newton-metre
- b)Unit of viscosity is poise
- c)Work and energy have same dimensions
- d)Unit of surface tension is Newton metre
Correct answer is option 'D'. Can you explain this answer?
Which of the following statement is wrong ?
a)
Unit of K.E. is Newton-metre
b)
Unit of viscosity is poise
c)
Work and energy have same dimensions
d)
Unit of surface tension is Newton metre
|
|
Rajesh Gupta answered |
The incorrect statement is:
d) Unit of surface tension is Newton metre.
The correct unit of surface tension is Newton per metre (N/m), not Newton metre.
Here's a breakdown:
- a) Unit of K.E. is Newton-metre: True, because kinetic energy is measured in joules, and 1 joule equals 1 Newton-metre.
- b) Unit of viscosity is poise: True, poise is indeed a unit of dynamic viscosity.
- c) Work and energy have the same dimensions: True, both work and energy have the same dimensions and are measured in joules.
- d) Unit of surface tension is Newton metre: Incorrect, it should be Newton per metre (N/m).
105 ml of pure water at 4°C saturated with NH3 gas yielded a solution of density 0.9 g/ml and containing 30% NH by mass. Find the valume of resulting NH3 solution. - a)66.67 ml
- b)166.67 ml
- c)133.33 ml
- d)266.67 ml
Correct answer is option 'B'. Can you explain this answer?
105 ml of pure water at 4°C saturated with NH3 gas yielded a solution of density 0.9 g/ml and containing 30% NH by mass. Find the valume of resulting NH3 solution.
a)
66.67 ml
b)
166.67 ml
c)
133.33 ml
d)
266.67 ml
|
EduRev JEE answered |
Given -
volume of water = 105 mL
density of solution = 0.9 g/mL
Calculation -
Since ammonia dissolved in water is 30% by weight, then using mass % formula, we can calculate the amount of ammonia in water
volume of water = 105 mL
density of solution = 0.9 g/mL
Calculation -
Since ammonia dissolved in water is 30% by weight, then using mass % formula, we can calculate the amount of ammonia in water
At 4 degree C, density of water = 0.999 g/mL
since density = mass /volume
0.999 = mass/ 105
mass of water = 104.895 g
now, let mass of ammonia be x.
since density = mass /volume
0.999 = mass/ 105
mass of water = 104.895 g
now, let mass of ammonia be x.
30x + 3146.85 = 100x
70x = 3146.85
x = 44.955 g
Thus, ammonia dissolved in 105 mL water is 44.955 g
Therefore, total mass of solution = mass of ammonia + mass of water
Mass of solution = 44.955 + 104.895
Mass of solution = 149.85 g
So,density of solution = mass of solution / volume of solution
0.9 g/mL = 149.85 g / Volume of solution
Volume of solution = 149.85/ 0.9
Volume of solution = 166.5 mL
70x = 3146.85
x = 44.955 g
Thus, ammonia dissolved in 105 mL water is 44.955 g
Therefore, total mass of solution = mass of ammonia + mass of water
Mass of solution = 44.955 + 104.895
Mass of solution = 149.85 g
So,density of solution = mass of solution / volume of solution
0.9 g/mL = 149.85 g / Volume of solution
Volume of solution = 149.85/ 0.9
Volume of solution = 166.5 mL
Can you explain the answer of this question below: The SI unit of length is the meter. Suppose we adopt a new unit of length which equals to x meters. The area 1m2 expressed in terms of the new unit has a magnitude-- A:x
- B:x2
- C:
- D:
The answer is d.
The SI unit of length is the meter. Suppose we adopt a new unit of length which equals to x meters. The area 1m2 expressed in terms of the new unit has a magnitude-
A:
x
B:
x2
C:
D:
|
Kamna Science Academy answered |
We have 1 unit = x meters
So 1 unit2 = x2 meter2
Hence, we get 1 meter2 = 1/x2 unit2
So 1 unit2 = x2 meter2
Hence, we get 1 meter2 = 1/x2 unit2
The maintenance of constant temperature inside the body is an example of- a)Homoeostasis
- b)Negative feedback loop
- c)Both A and B
- d)None of these
Correct answer is 'B'. Can you explain this answer?
The maintenance of constant temperature inside the body is an example of
a)
Homoeostasis
b)
Negative feedback loop
c)
Both A and B
d)
None of these
|
Pallavi Chopra answered |
Homeostasis maintains optimal conditions for enzyme action throughout the body, as well as all cell functions. It is the maintenance of a constant internal environment despite changes in internal and external conditions. In the human body, these include the control of blood glucose concentration.
The M.K.S. units of coefficient of viscosity is-- a)kg m-1s-1
- b)kg m s-2
- c)kg m2 s-1
- d)kg-1 m-1 s2
Correct answer is option 'A'. Can you explain this answer?
The M.K.S. units of coefficient of viscosity is-
a)
kg m-1s-1
b)
kg m s-2
c)
kg m2 s-1
d)
kg-1 m-1 s2
|
|
Suresh Iyer answered |
We know that coefficient of viscosity (η)= Fr/Av where F = tangential force, r = distance between the layers , v = velocity and A is the area of the surface.
Thus we get [η] = MLT-2.L / L2. (L/T)
= M / LT
Thus its unit is kg / m sec
Thus we get [η] = MLT-2.L / L2. (L/T)
= M / LT
Thus its unit is kg / m sec
Mixture of yeast, sugar and water was taken in a test tube. After one hour, bubbles were observed in the mixture. The formation of bubbles was due to- a)Respiration
- b)Photosynthesis
- c)Digestion
- d)Excretion
Correct answer is 'A'. Can you explain this answer?
Mixture of yeast, sugar and water was taken in a test tube. After one hour, bubbles were observed in the mixture. The formation of bubbles was due to
a)
Respiration
b)
Photosynthesis
c)
Digestion
d)
Excretion
|
Ruchi Basak answered |
The formation of bubble was due to production of CO2 & hence answer should be respiration as in respiration only breakdown of nutrients occur.
A pair of physical quantities having the same dimensional formula is :- a)angular momentum and torque
- b)torque and energy
- c)force and power
- d)power and angular momentum
Correct answer is option 'B'. Can you explain this answer?
A pair of physical quantities having the same dimensional formula is :
a)
angular momentum and torque
b)
torque and energy
c)
force and power
d)
power and angular momentum
|
Gaurav Kumar answered |
The dimensions of angular momentum are M L2T−1
That of torque is M L2T−2
Also dimension of energy is M L2T−2
Where as same of force is M LT−2
And of power is M L2T−3
Thus we get torque and energy have the same dimensional formulas.
That of torque is M L2T−2
Also dimension of energy is M L2T−2
Where as same of force is M LT−2
And of power is M L2T−3
Thus we get torque and energy have the same dimensional formulas.
Suppose refractive index μ is given as μ = A + B/λ2 where A and B are constants and λ is wavelength, then dimensions of B are same as that of- a)wavelength
- b)volume
- c)pressure
- d)area
Correct answer is option 'D'. Can you explain this answer?
Suppose refractive index μ is given as μ = A + B/λ2 where A and B are constants and λ is wavelength, then dimensions of B are same as that of
a)
wavelength
b)
volume
c)
pressure
d)
area
|
Top Rankers answered |
hence, μ is dimensionless.
Thus, each term on the R.H.S. of given equation should be dimensionless, i.e., B/λ2 is dimensionless, i.e., B should have dimension of λ2, i.e., cm2, i.e., area.
Nitrogen (N), phosphorus (P) and Potassium (K) are the main nutrients in plant fertilizers. According to an industry convention, the numbers on the label refer to the mass % of N, P205 and K20 in that order calculate the N : P : K ratio of a 30 : 10 : 10, fertilizer in terms of moles of each element and express it as x: y : 1. - a)10 : 0.67 : 1
- b)20 : 0.37 : 1
- c)0.37 : 10: 1
- d)5 : 2 : 1
Correct answer is option 'A'. Can you explain this answer?
Nitrogen (N), phosphorus (P) and Potassium (K) are the main nutrients in plant fertilizers. According to an industry convention, the numbers on the label refer to the mass % of N, P205 and K20 in that order calculate the N : P : K ratio of a 30 : 10 : 10, fertilizer in terms of moles of each element and express it as x: y : 1.
a)
10 : 0.67 : 1
b)
20 : 0.37 : 1
c)
0.37 : 10: 1
d)
5 : 2 : 1
|
Infinity Academy answered |
Molar mass of N is 14.0067 g/mol.
Molar mass of P2O5 is 30.973762*205 = 6349.62121 g/mol.
Molar mass of K2O is 39.0983*20 = 781.966 g/mol
Ratio of masses is 30:10:10
Therefore for each 50 g of fertilizer:
For N: 30 g / 14.0067 g/mol = 30/14.0067 moles
For P2O5: 10 g / 6349.62121 g/mol = 10/6349.62121 moles
For K2O: 10 g / 781.966 g/mol = 10/781.966 moles
Ratio of elements in terms of moles:
30/14.0067 : 10/6349.62121 : 10/781.966
30/14.0067*781.966/10 : 10/6349.62121*781.966/10 : 10/781.966*781.966/10
167.484 : 0.123 : 1.0
Molar mass of P2O5 is 30.973762*205 = 6349.62121 g/mol.
Molar mass of K2O is 39.0983*20 = 781.966 g/mol
Ratio of masses is 30:10:10
Therefore for each 50 g of fertilizer:
For N: 30 g / 14.0067 g/mol = 30/14.0067 moles
For P2O5: 10 g / 6349.62121 g/mol = 10/6349.62121 moles
For K2O: 10 g / 781.966 g/mol = 10/781.966 moles
Ratio of elements in terms of moles:
30/14.0067 : 10/6349.62121 : 10/781.966
30/14.0067*781.966/10 : 10/6349.62121*781.966/10 : 10/781.966*781.966/10
167.484 : 0.123 : 1.0
The sum of the numbers 436.32, 227.2 and 0.301 in appropriate significant figures is- a)663.821
- b)663.8
- c)664
- d)663.82
Correct answer is option 'B'. Can you explain this answer?
The sum of the numbers 436.32, 227.2 and 0.301 in appropriate significant figures is
a)
663.821
b)
663.8
c)
664
d)
663.82
|
|
Amrita Choudhary answered |
The result of an addition or subtraction in the number having different precisions should be reported to the same number of decimal places as present in the number having the least number of decimal places.
The final result should, therefore, be rounded off to one decimal place, i.e. 663.8
The dimensional formula of coefficient of viscosity is- a)[MLT-1]
- b)[M-1L2T-2]
- c)[ML-1T -1]
- d)none of these
Correct answer is option 'C'. Can you explain this answer?
The dimensional formula of coefficient of viscosity is
a)
[MLT-1]
b)
[M-1L2T-2]
c)
[ML-1T -1]
d)
none of these
|
Rahul Chaudhary answered |
Coefficient of viscosity (η)= Fr/Av
F= tangential Force, Area, r= distance between the layers, v= velocity.
Dimensional Formula of Force = M1L1T-2.
Dimensional Formula of Area= M0L2T0.
Dimensional Formula of distance= M0L1T0.
Dimensional Formula of velocity= M0L1T-1.
Dimensional Formula of Area= M0L2T0.
Dimensional Formula of distance= M0L1T0.
Dimensional Formula of velocity= M0L1T-1.
Putting these values in above equation we get,
[η]= [M1L1T-2][M0L1T0] / [M0L2T0] [M0L1T-1] = [M1L-1T-1]
For 10(at+3) , the dimension of a is-- a)M0 L0 T0
- b)M0 L0 T1
- c)M0 L0 T-1
- d)None of these
Correct answer is option 'C'. Can you explain this answer?
For 10(at+3) , the dimension of a is-
a)
M0 L0 T0
b)
M0 L0 T1
c)
M0 L0 T-1
d)
None of these
|
Lavanya Menon answered |
As 'at' and 3 are added in the equation, we get at and 3 have same dimensions i.e.1
Thus a has dimensions same as 1/t.
Thus a has dimensions same as 1/t.
If 10 gm of V205 is dissolved in acid and is reduced to V2+ by zinc metal, how many mole of I2 could be reduced by the resulting solution if it is further oxidised to V02+ ions ?[Assume no change in state of Zn2+ions] (V = 51, 0 = 16, I = 127) :- a)0.11 mole of 12
- b)0.22 mole of 12
- c)0.055 mole of 12
- d)0.44 mole of 12
Correct answer is option 'A'. Can you explain this answer?
If 10 gm of V205 is dissolved in acid and is reduced to V2+ by zinc metal, how many mole of I2 could be reduced by the resulting solution if it is further oxidised to V02+ ions ?
[Assume no change in state of Zn2+ions] (V = 51, 0 = 16, I = 127) :
a)
0.11 mole of 12
b)
0.22 mole of 12
c)
0.055 mole of 12
d)
0.44 mole of 12
|
Tejas Joshi answered |
25.0 g of FeSO4.7H20 was dissolved in water containing dilute H2S04, and the volume was made up to 1.0 L. 25.0 mL of this solution required 20 mL of an N/10 KMnO4 solution for complete oxidation. The percentage of FeSO4. 7H20 in the acid solution is- a)78%
- b)98%
- c)89%
- d)79%
Correct answer is option 'C'. Can you explain this answer?
25.0 g of FeSO4.7H20 was dissolved in water containing dilute H2S04, and the volume was made up to 1.0 L. 25.0 mL of this solution required 20 mL of an N/10 KMnO4 solution for complete oxidation. The percentage of FeSO4. 7H20 in the acid solution is
a)
78%
b)
98%
c)
89%
d)
79%
|
Devansh Goyal answered |
H2O2 acts as both oxidising as well as reducing agent its product is H20, when act as oxidising agent and its product is 02 when act as of reducing agent. The strength of '10P means one liter of H202 solution on decomposition at S.T.P. condition liberate 10 liters of oxygen gas 
15 gm Mn04)2 sample containing inert impurity is completely reacting with 100 ml of '11.2 V' H202, then what will be the % purity of Ba (Mn04)2 in the sample ? (Atomic mass Ba = 137, Mn = 55) - a)5%
- b)10%
- c)50%
- d)none
Correct answer is option 'C'. Can you explain this answer?
H2O2 acts as both oxidising as well as reducing agent its product is H20, when act as oxidising agent and its product is 02 when act as of reducing agent. The strength of '10P means one liter of H202 solution on decomposition at S.T.P. condition liberate 10 liters of oxygen gas 15 gm Mn04)2 sample containing inert impurity is completely reacting with 100 ml of '11.2 V' H202, then what will be the % purity of Ba (Mn04)2 in the sample ? (Atomic mass Ba = 137, Mn = 55)
15 gm Mn04)2 sample containing inert impurity is completely reacting with 100 ml of '11.2 V' H202, then what will be the % purity of Ba (Mn04)2 in the sample ? (Atomic mass Ba = 137, Mn = 55) a)
5%
b)
10%
c)
50%
d)
none
|
Harshad Nair answered |
One of the following functions is exhibited only by green plants and not by animals.- a)Growth
- b)Photosynthesis
- c)Digestion
- d)Response
Correct answer is 'B'. Can you explain this answer?
One of the following functions is exhibited only by green plants and not by animals.
a)
Growth
b)
Photosynthesis
c)
Digestion
d)
Response
|
|
Anjali Iyer answered |
Photosynthesis takes place inside plant cells in small things called chloroplasts. Chloroplasts contain a green substance called chlorophyll. This absorbs the light energy needed to make photosynthesis happen.
What is the significance of taxonomic categories and hierarchy in biology?- a) They represent concrete objects for classification
- b) They denote biological entities solely based on morphology
- c) They highlight the rank and grouping of organisms
- d) They emphasize the number of legs an organism possesses
Correct answer is option 'C'. Can you explain this answer?
What is the significance of taxonomic categories and hierarchy in biology?
a)
They represent concrete objects for classification
b)
They denote biological entities solely based on morphology
c)
They highlight the rank and grouping of organisms
d)
They emphasize the number of legs an organism possesses
|
|
Top Rankers answered |
Taxonomic categories and hierarchy in biology are crucial for organizing and classifying living organisms. They help in understanding the relationships between different species by grouping them based on shared characteristics. Each rank or taxon in the hierarchy represents a specific unit of classification, allowing scientists to categorize and study organisms more effectively. This system provides a structured way to classify the diversity of life on Earth, from broad categories like kingdoms to specific species, enabling scientists to make sense of the vast array of living organisms.
What does the term "taxonomic category" refer to within the context of classification processes?- a)The final step in the classification hierarchy
- b)A unit of classification representing a rank
- c)The overall taxonomic arrangement
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
What does the term "taxonomic category" refer to within the context of classification processes?
a)
The final step in the classification hierarchy
b)
A unit of classification representing a rank
c)
The overall taxonomic arrangement
d)
None of these
|
Stepway Academy answered |
In the realm of classification, a "taxonomic category" specifically denotes a unit of classification that represents a particular rank. This term is commonly known as a "taxon." Each taxonomic category plays a crucial role in organizing organisms according to shared characteristics and evolutionary relationships. By assigning entities to specific taxonomic categories, scientists can create a structured hierarchy that aids in understanding the diversity of life on Earth.
Biodiversity is:- a)Number and type of organisms present on earth.
- b)Number and type of plants present on earth.
- c)Number and type of animals present on earth.
- d)None of the above.
Correct answer is option 'A'. Can you explain this answer?
Biodiversity is:
a)
Number and type of organisms present on earth.
b)
Number and type of plants present on earth.
c)
Number and type of animals present on earth.
d)
None of the above.
|
|
Neha Sarkar answered |
Understanding Biodiversity
Biodiversity refers to the variety of life on Earth, encompassing all living organisms, their genetic differences, and the ecosystems they form. Here’s a breakdown of why option 'A' is the correct answer:
1. Definition of Biodiversity
- Biodiversity is a comprehensive term that includes:
- The number of species (both plant and animal).
- The types of organisms present, including microorganisms, fungi, plants, and animals.
- The genetic diversity within these species.
2. Components of Biodiversity
- Biodiversity consists of three main components:
- Genetic Diversity: Variation within species, crucial for adaptation and survival.
- Species Diversity: The variety of species in a given area, including both flora and fauna.
- Ecosystem Diversity: The range of different habitats and ecological processes.
3. Importance of Biodiversity
- Biodiversity is vital for:
- Ecosystem Stability: More diverse ecosystems are more resilient and can better withstand environmental changes.
- Human Welfare: It provides resources like food, medicine, and raw materials.
- Cultural Value: Biodiversity contributes to cultural identity and recreational opportunities.
4. Why Not Options B and C?
- Options B and C narrow the definition to only plants or animals, missing the broader scope of all living organisms.
- Biodiversity includes microorganisms and fungi, which are equally important to ecosystems.
In summary, biodiversity encompasses the number and types of organisms present on Earth, making option 'A' the correct choice. Understanding this concept is crucial for conservation efforts and maintaining ecological balance.
Biodiversity refers to the variety of life on Earth, encompassing all living organisms, their genetic differences, and the ecosystems they form. Here’s a breakdown of why option 'A' is the correct answer:
1. Definition of Biodiversity
- Biodiversity is a comprehensive term that includes:
- The number of species (both plant and animal).
- The types of organisms present, including microorganisms, fungi, plants, and animals.
- The genetic diversity within these species.
2. Components of Biodiversity
- Biodiversity consists of three main components:
- Genetic Diversity: Variation within species, crucial for adaptation and survival.
- Species Diversity: The variety of species in a given area, including both flora and fauna.
- Ecosystem Diversity: The range of different habitats and ecological processes.
3. Importance of Biodiversity
- Biodiversity is vital for:
- Ecosystem Stability: More diverse ecosystems are more resilient and can better withstand environmental changes.
- Human Welfare: It provides resources like food, medicine, and raw materials.
- Cultural Value: Biodiversity contributes to cultural identity and recreational opportunities.
4. Why Not Options B and C?
- Options B and C narrow the definition to only plants or animals, missing the broader scope of all living organisms.
- Biodiversity includes microorganisms and fungi, which are equally important to ecosystems.
In summary, biodiversity encompasses the number and types of organisms present on Earth, making option 'A' the correct choice. Understanding this concept is crucial for conservation efforts and maintaining ecological balance.
Order…….. and primate comes under class……- a)Carnivora, mammalia
- b)Diptera, Reptilia
- c)Poals, Reptilia
- d)Diptera, mammalia
Correct answer is option 'A'. Can you explain this answer?
a)
Carnivora, mammalia
b)
Diptera, Reptilia
c)
Poals, Reptilia
d)
Diptera, mammalia
|
|
Swati Iyer answered |
Understanding the Classification of Animals
In biological classification, organisms are categorized into different hierarchical groups based on their evolutionary relationships. The two terms in question, "Order" and "Class," refer to specific levels in this taxonomy.
Order: Carnivora
- Carnivora is an order that includes a wide range of animals primarily characterized by their carnivorous diet.
- Members of this order include familiar animals like dogs, cats, bears, and seals. They possess adaptations such as sharp teeth and claws for hunting and consuming prey.
Class: Mammalia
- Mammalia is the class that encompasses all mammals, characterized by features such as hair or fur, mammary glands for nursing young, and a higher degree of brain development.
- Mammals are warm-blooded and usually give live birth, with some exceptions like monotremes (e.g., platypus).
Primate Classification
- Primates, which include humans, monkeys, and apes, are classified under the order Primates within the class Mammalia.
- This classification highlights their shared characteristics, such as flexible limbs, large brains, and social behavior.
Correct Answer Explanation
- The correct answer option 'A' states that "Order… and primate comes under class… Carnivora, Mammalia."
- This option is accurate because while Primates belong to the class Mammalia, Carnivora is another order within the same class. The confusion arises from the relationship between these classifications.
In conclusion, understanding the hierarchical structure of biological classification helps clarify how different organisms relate to one another within the animal kingdom.
In biological classification, organisms are categorized into different hierarchical groups based on their evolutionary relationships. The two terms in question, "Order" and "Class," refer to specific levels in this taxonomy.
Order: Carnivora
- Carnivora is an order that includes a wide range of animals primarily characterized by their carnivorous diet.
- Members of this order include familiar animals like dogs, cats, bears, and seals. They possess adaptations such as sharp teeth and claws for hunting and consuming prey.
Class: Mammalia
- Mammalia is the class that encompasses all mammals, characterized by features such as hair or fur, mammary glands for nursing young, and a higher degree of brain development.
- Mammals are warm-blooded and usually give live birth, with some exceptions like monotremes (e.g., platypus).
Primate Classification
- Primates, which include humans, monkeys, and apes, are classified under the order Primates within the class Mammalia.
- This classification highlights their shared characteristics, such as flexible limbs, large brains, and social behavior.
Correct Answer Explanation
- The correct answer option 'A' states that "Order… and primate comes under class… Carnivora, Mammalia."
- This option is accurate because while Primates belong to the class Mammalia, Carnivora is another order within the same class. The confusion arises from the relationship between these classifications.
In conclusion, understanding the hierarchical structure of biological classification helps clarify how different organisms relate to one another within the animal kingdom.
Which of the following system of units is NOT based on the unit of mass, length and time alone- a)FPS (foot-pound-second)
- b)SI (International System of Units)
- c)CGS (centimeter-gram-second)
- d)MKS (meter-kilogram-second)
Correct answer is option 'B'. Can you explain this answer?
Which of the following system of units is NOT based on the unit of mass, length and time alone
a)
FPS (foot-pound-second)
b)
SI (International System of Units)
c)
CGS (centimeter-gram-second)
d)
MKS (meter-kilogram-second)
|
|
Arya Rane answered |
Understanding the Systems of Units
When discussing systems of units, it's crucial to know how they relate to fundamental quantities such as mass, length, and time. Let’s break down each system mentioned:
FPS (Foot-Pound-Second)
- This system is based on units of length (foot), mass (pound), and time (second).
- It is primarily used in the United States for everyday measurements.
CGS (Centimeter-Gram-Second)
- This system is based on units of length (centimeter), mass (gram), and time (second).
- It is commonly used in scientific contexts, particularly in physics and chemistry.
MKS (Meter-Kilogram-Second)
- MKS uses the meter for length, kilogram for mass, and second for time.
- It is often used in engineering and scientific applications.
SI (International System of Units)
- The SI system is the modern form of the metric system and includes additional base units beyond just mass, length, and time.
- Key base units include:
- Ampere (electric current)
- Kelvin (temperature)
- Mole (amount of substance)
- Thus, it is not solely based on mass, length, and time.
Conclusion
Therefore, the correct answer is option 'B' because the SI system incorporates additional fundamental units, making it more comprehensive than just the basic dimensions of mass, length, and time. This distinction highlights the SI system's versatility and its role in scientific standardization globally.
When discussing systems of units, it's crucial to know how they relate to fundamental quantities such as mass, length, and time. Let’s break down each system mentioned:
FPS (Foot-Pound-Second)
- This system is based on units of length (foot), mass (pound), and time (second).
- It is primarily used in the United States for everyday measurements.
CGS (Centimeter-Gram-Second)
- This system is based on units of length (centimeter), mass (gram), and time (second).
- It is commonly used in scientific contexts, particularly in physics and chemistry.
MKS (Meter-Kilogram-Second)
- MKS uses the meter for length, kilogram for mass, and second for time.
- It is often used in engineering and scientific applications.
SI (International System of Units)
- The SI system is the modern form of the metric system and includes additional base units beyond just mass, length, and time.
- Key base units include:
- Ampere (electric current)
- Kelvin (temperature)
- Mole (amount of substance)
- Thus, it is not solely based on mass, length, and time.
Conclusion
Therefore, the correct answer is option 'B' because the SI system incorporates additional fundamental units, making it more comprehensive than just the basic dimensions of mass, length, and time. This distinction highlights the SI system's versatility and its role in scientific standardization globally.
Why is taxonomy important in agriculture and forestry?- a)It aids in the conservation and management of plant and animal resources.
- b)It facilitates the production of hybrid crops.
- c)It helps in genetic engineering of plants and trees.
- d)It promotes the use of pesticides.
Correct answer is option 'A'. Can you explain this answer?
Why is taxonomy important in agriculture and forestry?
a)
It aids in the conservation and management of plant and animal resources.
b)
It facilitates the production of hybrid crops.
c)
It helps in genetic engineering of plants and trees.
d)
It promotes the use of pesticides.
|
|
Stepway Academy answered |
Taxonomy helps in understanding and preserving the diversity of plant and animal species, which is essential for conservation and resource management.
1.2 gm of carbon is burnt completely in oxygen (limited supply) to produce CO and C02. This mixture of gases is treated with solid 1205 (to know the amount of CO produced), the liberated iodine required 120 ml of 0.1 M hypo solution for complete titration. The % of carbon converted into CO is :a)60%b)100%c)50%d)70%Correct answer is option 'D'. Can you explain this answer?
|
Aniket Basu answered |
What is incorrect for taxonomic hierarchy?- a)There are 7 obligate and more than 21 intermediate categories
- b)Higher the category, fewer the number of organisms
- c)Lower the category, more the number of common features
- d)Greatest similarity in structure is found in between members of a species
Correct answer is option 'A'. Can you explain this answer?
a)
There are 7 obligate and more than 21 intermediate categories
b)
Higher the category, fewer the number of organisms
c)
Lower the category, more the number of common features
d)
Greatest similarity in structure is found in between members of a species
|
|
Top Rankers answered |
The taxonomic hierarchy generally includes 8 primary categories (kingdom, phylum, class, order, family, genus, species, variety) and not 7 obligate categories.
The other statements are correct, based on the classification system used in biology.
The other statements are correct, based on the classification system used in biology.
The pressure of 106 dyne/cm2 is equivalent to- a)105 N/m2
- b)106 N/m2
- c)107 N/m2
- d)108 N/m2
Correct answer is option 'A'. Can you explain this answer?
The pressure of 106 dyne/cm2 is equivalent to
a)
105 N/m2
b)
106 N/m2
c)
107 N/m2
d)
108 N/m2
|
|
Rajeev Nair answered |
We know that 105 dyne = 1N
And 104cm2 = 1 m2
Thus we get 10 dyne / cm2 = N / m2
Hence 106 dyne / cm2 =105 N / m2
And 104cm2 = 1 m2
Thus we get 10 dyne / cm2 = N / m2
Hence 106 dyne / cm2 =105 N / m2
The number of moles of ferrous oxalate oxidised by one mole of KMn04 is- a)5/2
- b)2/5
- c)3/5
- d)5/3
Correct answer is option 'D'. Can you explain this answer?
The number of moles of ferrous oxalate oxidised by one mole of KMn04 is
a)
5/2
b)
2/5
c)
3/5
d)
5/3
|
Jhanvi Chakraborty answered |
Understanding the Reaction
To determine the number of moles of ferrous oxalate oxidized by one mole of KMnO4, we need to analyze the redox reaction between these substances.
Oxidation and Reduction
- KMnO4 acts as an oxidizing agent in acidic medium, where it gets reduced from Mn(VII) to Mn(II).
- Ferrous oxalate (FeC2O4) is oxidized to ferric ion (Fe3+) and carbon dioxide.
Balanced Chemical Equation
The balanced redox reaction can be represented as:
MnO4- + Fe2+ + C2O4^2- → Mn2+ + Fe3+ + 2CO2
This equation shows that one mole of KMnO4 reacts with ferrous ions (Fe2+) and oxalate ions (C2O4^2-).
Mole Ratio
- From the balanced equation, we observe that:
- 1 mole of KMnO4 reacts with 5 moles of electrons.
- Ferrous oxalate (FeC2O4) donates 2 electrons per mole of Fe2+ and 2 electrons from each mole of C2O4^2-.
Calculating Moles of Ferrous Oxalate
- Since each ferrous oxalate provides 2 moles of electrons, the total electrons involved from ferrous oxalate are:
- 2 moles of electrons from Fe2+ and 2 moles from C2O4^2- contribute to 4 moles of electrons.
To fully balance, it can be concluded that:
- 1 mole of KMnO4 oxidizes 5 moles of ferrous oxalate.
Thus, the number of moles of ferrous oxalate oxidized by one mole of KMnO4 is:
Final Answer
- 5/3 moles (Option D)
To determine the number of moles of ferrous oxalate oxidized by one mole of KMnO4, we need to analyze the redox reaction between these substances.
Oxidation and Reduction
- KMnO4 acts as an oxidizing agent in acidic medium, where it gets reduced from Mn(VII) to Mn(II).
- Ferrous oxalate (FeC2O4) is oxidized to ferric ion (Fe3+) and carbon dioxide.
Balanced Chemical Equation
The balanced redox reaction can be represented as:
MnO4- + Fe2+ + C2O4^2- → Mn2+ + Fe3+ + 2CO2
This equation shows that one mole of KMnO4 reacts with ferrous ions (Fe2+) and oxalate ions (C2O4^2-).
Mole Ratio
- From the balanced equation, we observe that:
- 1 mole of KMnO4 reacts with 5 moles of electrons.
- Ferrous oxalate (FeC2O4) donates 2 electrons per mole of Fe2+ and 2 electrons from each mole of C2O4^2-.
Calculating Moles of Ferrous Oxalate
- Since each ferrous oxalate provides 2 moles of electrons, the total electrons involved from ferrous oxalate are:
- 2 moles of electrons from Fe2+ and 2 moles from C2O4^2- contribute to 4 moles of electrons.
To fully balance, it can be concluded that:
- 1 mole of KMnO4 oxidizes 5 moles of ferrous oxalate.
Thus, the number of moles of ferrous oxalate oxidized by one mole of KMnO4 is:
Final Answer
- 5/3 moles (Option D)
The dimensional representation of Planck's constant is identical to that of- a)torque
- b)work
- c)stress
- d)angular momentum
Correct answer is option 'D'. Can you explain this answer?
The dimensional representation of Planck's constant is identical to that of
a)
torque
b)
work
c)
stress
d)
angular momentum
|
|
Maitri Nambiar answered |
Understanding Planck's Constant
Planck's constant (h) is a fundamental constant in quantum mechanics that relates the energy of a photon to its frequency. Its dimensional representation is crucial for understanding its role in various physical phenomena.
Dimensional Formula of Planck's Constant
- Planck's constant has the dimensions of action, which can be expressed as:
- Energy × Time
- The dimensional formula for energy is [M L² T⁻²], and for time, it is [T].
- Therefore, the dimensional representation of Planck's constant is [M L² T⁻¹].
Comparison with Other Physical Quantities
- Let's analyze the dimensional formulas of the options provided to see why angular momentum is the correct answer:
- Torque:
- Dimensional formula: [M L² T⁻²] × [L] = [M L² T⁻²] (not a match)
- Work:
- Dimensional formula: [M L² T⁻²] (not a match)
- Stress:
- Dimensional formula: Force/Area = [M L⁻¹ T⁻²] (not a match)
- Angular Momentum:
- Dimensional formula: [M L² T⁻¹] (this matches with Planck's constant)
Conclusion
- The dimensional representation of Planck's constant is identical to that of angular momentum, confirming that option 'D' is indeed the correct answer. Understanding this relationship helps bridge concepts in quantum mechanics and classical mechanics.
Planck's constant (h) is a fundamental constant in quantum mechanics that relates the energy of a photon to its frequency. Its dimensional representation is crucial for understanding its role in various physical phenomena.
Dimensional Formula of Planck's Constant
- Planck's constant has the dimensions of action, which can be expressed as:
- Energy × Time
- The dimensional formula for energy is [M L² T⁻²], and for time, it is [T].
- Therefore, the dimensional representation of Planck's constant is [M L² T⁻¹].
Comparison with Other Physical Quantities
- Let's analyze the dimensional formulas of the options provided to see why angular momentum is the correct answer:
- Torque:
- Dimensional formula: [M L² T⁻²] × [L] = [M L² T⁻²] (not a match)
- Work:
- Dimensional formula: [M L² T⁻²] (not a match)
- Stress:
- Dimensional formula: Force/Area = [M L⁻¹ T⁻²] (not a match)
- Angular Momentum:
- Dimensional formula: [M L² T⁻¹] (this matches with Planck's constant)
Conclusion
- The dimensional representation of Planck's constant is identical to that of angular momentum, confirming that option 'D' is indeed the correct answer. Understanding this relationship helps bridge concepts in quantum mechanics and classical mechanics.
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