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All questions of 2013 for NEET Exam
To obtain a p-type germanium semiconductor, it must be doped with- a)arsenic
- b)antimony
- c)Indium
- d)phosphorous
Correct answer is option 'C'. Can you explain this answer?
To obtain a p-type germanium semiconductor, it must be doped with
a)
arsenic
b)
antimony
c)
Indium
d)
phosphorous
|
Anmol answered |
Indium is trivalent impurity so p type semiconductor will be obtained.
Can you explain the answer of this question below: Velocity of sound waves in air is 330 m/s. For a particular sound in air a path difference of 40 cm is equivalent to phase difference of 1.6π. The frequency of the wave is
- A:
165 Hz
- B:
150 Hz
- C:
660 Hz
- D:
330 Hz
The answer is c.
Velocity of sound waves in air is 330 m/s. For a particular sound in air a path difference of 40 cm is equivalent to phase difference of 1.6π. The frequency of the wave is
165 Hz
150 Hz
660 Hz
330 Hz
|
Infinity Academy answered |
Option C 660Hz is correct answer... pi=2×
π×mu/velocity × X 1.6π=2×π×mu/330×0.4. (40 cm convert to m) calculate this u get the answer. So mu i.e,frequency of wave=660 Hz.
Can you explain the answer of this question below:A reptilian looks like house lizard is sitting on plant with its tail coiled around twig in your garden. Can you identify the animal?
- A:
Garden lizard (Calotes) showing camouflage
- B:
Chamaeleon showing protective colouration
- C:
Varanus showing mimicry
- D:
Hemidactylus showing sexual dimorphism
The answer is b.
A reptilian looks like house lizard is sitting on plant with its tail coiled around twig in your garden. Can you identify the animal?
Garden lizard (Calotes) showing camouflage
Chamaeleon showing protective colouration
Varanus showing mimicry
Hemidactylus showing sexual dimorphism
|
Arshi answered |
B. because chameleon is a garden lizard.
The half-life of a radioactive substance is 10 day. This means that- a)the substance completely disintegrates in 20 days.
- b)the substance completely disintegrates in 40 days.
- c)1/8 part at the mass of the substance will be left intact at the end of 40 days
- d)7/8 part of the mass of the substance disintegrates in 30 days.
Correct answer is option 'D'. Can you explain this answer?
The half-life of a radioactive substance is 10 day. This means that
a)
the substance completely disintegrates in 20 days.
b)
the substance completely disintegrates in 40 days.
c)
1/8 part at the mass of the substance will be left intact at the end of 40 days
d)
7/8 part of the mass of the substance disintegrates in 30 days.
|
Adit Raj answered |
Can you explain the answer of this question below: The Dakshinamurti idol of Shiva depicts him in which form?
- A:
Teacher
- B:
Dancing
- C:
Reclining
- D:
Meditating
The answer is a.
The Dakshinamurti idol of Shiva depicts him in which form?
Teacher
Dancing
Reclining
Meditating
|
Parvathy R Krishna answered |
Dakshinamurti is an aspect of Shiva as a guru(teacher) of all types of knowledge. This form represents him as a teacher of music, yoga and wisdom, etc. He is considered as an embodiment of knowledge and destroyer of ignorance.
A man whose father is a colourblind, marry a woman, who is a daughter of colourblind mother. The offspring of this couple will be- a)all daughter and sons are colourblind
- b)50% colourblind and 50% normal son
- c)carrier normal daughter and colourblind sons
- d)colourblind sons and normal daughter
Correct answer is option 'C'. Can you explain this answer?
A man whose father is a colourblind, marry a woman, who is a daughter of colourblind mother. The offspring of this couple will be
a)
all daughter and sons are colourblind
b)
50% colourblind and 50% normal son
c)
carrier normal daughter and colourblind sons
d)
colourblind sons and normal daughter
|
Researcher Guru. answered |
Women is a daughter of colour blind mother it means she must be carrier for trait. also a man is colour-blind because it cannot suppress the particular X-linked gene .so, when we cross we can get that there are carrier normal daughter and colour blind sons.
Two spherical conductors A and B of radii a and b (b> a) are placed concentrically in air. The two arc connected by a copper wire as shown in figure. The equivalent capacitance of the system is
- a)a
- b)b
- c)c
- d)d
Correct answer is option 'C'. Can you explain this answer?
Two spherical conductors A and B of radii a and b (b> a) are placed concentrically in air. The two arc connected by a copper wire as shown in figure. The equivalent capacitance of the system is
a)
a
b)
b
c)
c
d)
d
|
Madhu Soni answered |
When we connect it,all charge wiil come on outer surface in electrostatic equilibrium to minimise potential energy.so over all it will act as a sphere of radius b. so capacity will be according to outer sphere.
These questions consist of two statements each printed as assertion and reason. Whole answering these questions you are required to choose any one of of following responses.Assertion : The ratio Cp/Cvis more for helium gas than for hydrogen gas.
Reason : Atomic mass of helium is more than that of hydrogen.- a)If both the assertion and reason are true and reason explains the assertion
- b)If both the assertion and reason are true but reason does not explain the assertion
- c)If assertion is true but reason is false
- d)If assertion is false but reason is true
Correct answer is option 'B'. Can you explain this answer?
These questions consist of two statements each printed as assertion and reason. Whole answering these questions you are required to choose any one of of following responses.
Assertion : The ratio Cp/Cvis more for helium gas than for hydrogen gas.
Reason : Atomic mass of helium is more than that of hydrogen.
Reason : Atomic mass of helium is more than that of hydrogen.
a)
If both the assertion and reason are true and reason explains the assertion
b)
If both the assertion and reason are true but reason does not explain the assertion
c)
If assertion is true but reason is false
d)
If assertion is false but reason is true
|
Rutvik Goswami answered |
Perfect description
These questions consist of two statements each printed as assertion and reason. Whole answering these questions you are required to choose any one of of following responses.Assertion : A satellite moving in a circular orbit around the earth has a total energy E0, then its potential energy is -E0
Reason : Potential energy of the body at a Point In a gravitational field of orbit is –GMm/R- a)If both the assertion and reason are true and reason explains the assertion
- b)If both the assertion and reason are true but reason does not explain the assertion
- c)If assertion is true but reason is false
- d)If assertion is false but reason is true
Correct answer is option 'C'. Can you explain this answer?
These questions consist of two statements each printed as assertion and reason. Whole answering these questions you are required to choose any one of of following responses.
Assertion : A satellite moving in a circular orbit around the earth has a total energy E0, then its potential energy is -E0
Reason : Potential energy of the body at a Point In a gravitational field of orbit is –GMm/R
Reason : Potential energy of the body at a Point In a gravitational field of orbit is –GMm/R
a)
If both the assertion and reason are true and reason explains the assertion
b)
If both the assertion and reason are true but reason does not explain the assertion
c)
If assertion is true but reason is false
d)
If assertion is false but reason is true
|
Sanjay Krishna answered |
Answer is d not c
assertion ia false but reason is true
If a body revolving around the Earth has total energy Eo(which is negative) then its potential energy is 2Eo(which is also negative) and its kinetic energy is Eo(positive)
assertion ia false but reason is true
If a body revolving around the Earth has total energy Eo(which is negative) then its potential energy is 2Eo(which is also negative) and its kinetic energy is Eo(positive)
Rate constant k of a reaction varies, with temperature according to the equation log k = constant – Ea/2.303R x 1/T where Eais the energy of activation for the reaction When a graph is plotted for log k vs 1/T a straight line with a slope -6670 k is obtained. The activation energy for this reaction will be (R = 8.314JK-1mol-1)- a)122.65 kJmol-1
- b)127.71 kJmol-1
- c)142.34 kJmol-1
- d)150.00 kJmol-1
Correct answer is option 'B'. Can you explain this answer?
Rate constant k of a reaction varies, with temperature according to the equation log k = constant – Ea/2.303R x 1/T where Eais the energy of activation for the reaction When a graph is plotted for log k vs 1/T a straight line with a slope -6670 k is obtained. The activation energy for this reaction will be (R = 8.314JK-1mol-1)
a)
122.65 kJmol-1
b)
127.71 kJmol-1
c)
142.34 kJmol-1
d)
150.00 kJmol-1
|
|
Sarita Koturwar answered |
The composition of a sample of wustite is Fe0.93O. What percentage of the iron is present in the form of Fe (III)?- a)5%
- b)7.08%
- c)15.05%
- d)23.6%
Correct answer is option 'C'. Can you explain this answer?
The composition of a sample of wustite is Fe0.93O. What percentage of the iron is present in the form of Fe (III)?
a)
5%
b)
7.08%
c)
15.05%
d)
23.6%
|
Pooja Mehta answered |
In pure iron oxide (FeO), iron and oxygen are present in the ratio 1 : 1.
However, here number of Fe2+ present = 0.93
Or No. of Fe2+ ions missing = 0.07
Since each Fe2+ ion has 2 positive charge, the total number of charge due to missing (0.07) Fe2+ ions = 0.07 * 2 = 0.14
To maintain electrical neutrality, 0.14 positive charge is compensated by the presence of Fe3+ ions. Now since, replacement of one Fe2+ ion by one Fe3+ ion increases one positive charge, 0.14 positive charge must be compensated by the presence of 0.14 Fe3+ ions.
In short, 0.93 Fe2+ ions have 0.14 Fe3+ ions
100 Fe2+ ions have = 0.14/0.93 * 100 = 15.05%
Electron affinity is positive, when- a)O changes into O–
- b)O changes into O2-
- c)O changes into O+
- d)election affinity is always negative
Correct answer is option 'B'. Can you explain this answer?
Electron affinity is positive, when
a)
O changes into O–
b)
O changes into O2-
c)
O changes into O+
d)
election affinity is always negative
|
|
Pooja Mukherjee answered |
2-b) Cl changes into Cl-
Explanation:
Electron affinity is defined as the energy released when an atom or ion gains an electron to form a negative ion. Therefore, electron affinity is positive when the process of gaining an electron is exothermic, meaning energy is released.
In the case of oxygen changing into O2, two oxygen atoms come together to form a diatomic molecule. This process is not related to electron affinity because it does not involve gaining an electron.
However, in the case of chlorine changing into chloride ion (Cl-), Cl gains an electron to form a negative ion. This process is exothermic, releasing energy, and therefore has a positive electron affinity.
Explanation:
Electron affinity is defined as the energy released when an atom or ion gains an electron to form a negative ion. Therefore, electron affinity is positive when the process of gaining an electron is exothermic, meaning energy is released.
In the case of oxygen changing into O2, two oxygen atoms come together to form a diatomic molecule. This process is not related to electron affinity because it does not involve gaining an electron.
However, in the case of chlorine changing into chloride ion (Cl-), Cl gains an electron to form a negative ion. This process is exothermic, releasing energy, and therefore has a positive electron affinity.
Can you explain the answer of this question below:Which one of the following best describe polygenic inheritance?
- A:
ABO blood group in human and flower colour of Mtrabilis Jalapa
- B:
Hair pigment of mouse and tongue roliing humans
- C:
Human eye colour and sickle-cell anaemia
- D:
Human height and colour of skin and eyes
The answer is d.
Which one of the following best describe polygenic inheritance?
ABO blood group in human and flower colour of Mtrabilis Jalapa
Hair pigment of mouse and tongue roliing humans
Human eye colour and sickle-cell anaemia
Human height and colour of skin and eyes
|
Rutuja Pawar answered |
The ans is (D)Bcoz (A) is describes incomplete dominance.(B) describes law of dominance.(C) describes pleiotropy i.e. single gene controls 2 or more phenotypic traits (D)describes polygenic inheritance i.e. interaction between 2 or more genes located on the same chromosomes or different chromosomes...So the ans is (D)
These questions consist of two statements each printed as assertion and reason. Whole answering these questions you are required to choose any one of of following responses.Assertion : In comparison to ethyl chloride it is difficult to carry out nucleophilic substitution on vinyl chloride.
Reason : Vinyl group is electron donating.- a)Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- b)Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- c)Assertion is true but Reason is false.
- d)Both Assertion and Reason are false
Correct answer is option 'C'. Can you explain this answer?
These questions consist of two statements each printed as assertion and reason. Whole answering these questions you are required to choose any one of of following responses.
Assertion : In comparison to ethyl chloride it is difficult to carry out nucleophilic substitution on vinyl chloride.
Reason : Vinyl group is electron donating.
Reason : Vinyl group is electron donating.
a)
Both Assertion and Reason are true and Reason is the correct explanation of Assertion
b)
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
c)
Assertion is true but Reason is false.
d)
Both Assertion and Reason are false
|
Abhiram Basu answered |
**Assertion and Reason**
**Assertion**: In comparison to ethyl chloride, it is difficult to carry out nucleophilic substitution on vinyl chloride.
**Reason**: Vinyl group is electron donating.
**Explanation**
Nucleophilic substitution reactions involve the substitution of a nucleophile (an electron-rich species) for a leaving group in a molecule. The ease of carrying out nucleophilic substitution reactions depends on the nature of the substrate and the leaving group.
In the given assertion, it is stated that it is difficult to carry out nucleophilic substitution on vinyl chloride compared to ethyl chloride. Let's analyze the reason provided to understand this statement.
**Reason Analysis**
The reason given is that the vinyl group is electron donating. This means that the vinyl group donates electron density towards the carbon atom it is attached to. Electron-donating groups increase the electron density on the carbon atom, making it less electrophilic and less susceptible to nucleophilic attack.
**Assertion and Reason Evaluation**
From the above analysis, we can evaluate the given assertion and reason as follows:
- The assertion is true: It is generally more difficult to carry out nucleophilic substitution on vinyl chloride compared to ethyl chloride.
- The reason is false: While vinyl group is electron donating, it does not provide an accurate explanation for the difficulty in nucleophilic substitution on vinyl chloride.
**Explanation of the Correct Answer**
The correct answer is option 'C': Assertion is true but Reason is false.
The assertion is true because vinyl chloride, which has a vinyl group (-CH=CH2), is less reactive towards nucleophilic substitution reactions compared to ethyl chloride. This can be attributed to the resonance stabilization and delocalization of the electron density in the vinyl group.
However, the reason provided is false because the assertion is not solely based on the electron-donating nature of the vinyl group. Other factors such as steric hindrance and stability of the leaving group also contribute to the difficulty in nucleophilic substitution reactions on vinyl chloride.
Overall, while the assertion is true, the reason provided is not the correct explanation for the given assertion.
**Assertion**: In comparison to ethyl chloride, it is difficult to carry out nucleophilic substitution on vinyl chloride.
**Reason**: Vinyl group is electron donating.
**Explanation**
Nucleophilic substitution reactions involve the substitution of a nucleophile (an electron-rich species) for a leaving group in a molecule. The ease of carrying out nucleophilic substitution reactions depends on the nature of the substrate and the leaving group.
In the given assertion, it is stated that it is difficult to carry out nucleophilic substitution on vinyl chloride compared to ethyl chloride. Let's analyze the reason provided to understand this statement.
**Reason Analysis**
The reason given is that the vinyl group is electron donating. This means that the vinyl group donates electron density towards the carbon atom it is attached to. Electron-donating groups increase the electron density on the carbon atom, making it less electrophilic and less susceptible to nucleophilic attack.
**Assertion and Reason Evaluation**
From the above analysis, we can evaluate the given assertion and reason as follows:
- The assertion is true: It is generally more difficult to carry out nucleophilic substitution on vinyl chloride compared to ethyl chloride.
- The reason is false: While vinyl group is electron donating, it does not provide an accurate explanation for the difficulty in nucleophilic substitution on vinyl chloride.
**Explanation of the Correct Answer**
The correct answer is option 'C': Assertion is true but Reason is false.
The assertion is true because vinyl chloride, which has a vinyl group (-CH=CH2), is less reactive towards nucleophilic substitution reactions compared to ethyl chloride. This can be attributed to the resonance stabilization and delocalization of the electron density in the vinyl group.
However, the reason provided is false because the assertion is not solely based on the electron-donating nature of the vinyl group. Other factors such as steric hindrance and stability of the leaving group also contribute to the difficulty in nucleophilic substitution reactions on vinyl chloride.
Overall, while the assertion is true, the reason provided is not the correct explanation for the given assertion.
These questions consist of two statements each printed as assertion and reason. Whole answering these questions you are required to choose any one of of following responses. Assertion : p-chlorobenzoic acid is stronger acid than benzoic acid.
Reason : Chlorine has electron donating resonance (+ R) effect.- a)Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- b)Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- c)Assertion is true but Reason is false.
- d)Both Assertion and Reason are false
Correct answer is option 'B'. Can you explain this answer?
These questions consist of two statements each printed as assertion and reason. Whole answering these questions you are required to choose any one of of following responses.
Assertion : p-chlorobenzoic acid is stronger acid than benzoic acid.
Reason : Chlorine has electron donating resonance (+ R) effect.
Reason : Chlorine has electron donating resonance (+ R) effect.
a)
Both Assertion and Reason are true and Reason is the correct explanation of Assertion
b)
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
c)
Assertion is true but Reason is false.
d)
Both Assertion and Reason are false
|
Tanu Rajput answered |
Ans should be option c, as Cl is electron withdrawing grp
The following table
is a truth table for- a)NAND gate
- b)NOR gate
- c)XOR gate
- d)AND gate
Correct answer is option 'A'. Can you explain this answer?
The following table
is a truth table for
is a truth table for
a)
NAND gate
b)
NOR gate
c)
XOR gate
d)
AND gate
|
Vivek Kumar answered |
X = not (A.B ) so it's ' not and gate I.e. Nand gate'
- a)both me objective and the eyepiece has short focal lengths
- b)both the objectve and the eyepiece have long focal lengths
- c)the objective has a Short focal length and the eyepiece has a long focal length
- d)the objective has a long focal length and the eyepiece has a short focal length
Correct answer is 'A'. Can you explain this answer?
|
Ujjwal Gupta answered |
Yes, option A, is correct because a compound microscope has both properties.
The value of g at a particular point is 9.8 ms-2 Suppose the earth suddenly shrinks uniformly to half it resent size without losing any mass . The value of g at the same point (distance of the point from the centre of earth does not change) Will now be- a)9.8 ms-2
- b)4.9 ms-2
- c)19.6 ms-2
- d)39.2 ms-2
Correct answer is option 'A'. Can you explain this answer?
The value of g at a particular point is 9.8 ms-2 Suppose the earth suddenly shrinks uniformly to half it resent size without losing any mass . The value of g at the same point (distance of the point from the centre of earth does not change) Will now be
a)
9.8 ms-2
b)
4.9 ms-2
c)
19.6 ms-2
d)
39.2 ms-2
|
Khushi Mittal answered |
Yes , the answer is (A) ......bcoz mass of earth has not altered only its size has been reduced and moreover the distance of the point from earth has not changed
Can you explain the answer of this question below:Directions: These questions consist of two statements each printed as assertion and reason. Whole answering these questions you are required to choose any one of of following responses.
Q.
Assertion Tropical rain forest are nth in flora and fauna along with microbes on this biosphere.
Reason The low latitude humid tropics harbour the rainforest ecosystem.
- A:
Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- B:
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- C:
Assertion is true but Reason is false.
- D:
Both Assertion and Reason are false
The answer is a.
Directions: These questions consist of two statements each printed as assertion and reason. Whole answering these questions you are required to choose any one of of following responses.
Q.
Assertion Tropical rain forest are nth in flora and fauna along with microbes on this biosphere.
Reason The low latitude humid tropics harbour the rainforest ecosystem.
Both Assertion and Reason are true and Reason is the correct explanation of Assertion
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
Assertion is true but Reason is false.
Both Assertion and Reason are false
|
|
Researcher Guru. answered |
Yes the answer must be ( A ) because as tropical rain forest is biologically rich so in order to favour it there is a presence of rain forest.
For the reaction, 1 g mole of CaCO3 is enclosed in 5 L container CaCO3(s) → CaO(s) CO2(g)Kp = 1.16 at 1073 K then per cent dissociation of CaCO3 is- a)zero
- b)6.58%
- c)65%
- d)100%
Correct answer is option 'B'. Can you explain this answer?
For the reaction, 1 g mole of CaCO3 is enclosed in 5 L container CaCO3(s) → CaO(s) CO2(g)Kp = 1.16 at 1073 K then per cent dissociation of CaCO3 is
a)
zero
b)
6.58%
c)
65%
d)
100%
|
|
Sarita Koturwar answered |
Kp= (diss.constant)*2 ×Pressure
%Dissociation =√Kp/P ×100
%Dissociation =√Kp/P ×100
Can you explain the answer of this question below:Sound waves do not.show the phenomenon of
- A:
interference
- B:
diffraction
- C:
refraction
- D:
polarisation
- E:
refraction(d) polarisation
The answer is d.
Sound waves do not.show the phenomenon of
interference
diffraction
refraction
polarisation
refraction(d) polarisation
|
Jemimà Fràñcis answered |
Sound wave is longtidudinal wave but polarisation is the characteristics of transverse wave.
Using the data given below find out the strongest reducing agentE°Cr2O4 /Cr3+ = 1.33 V, E°Cl2 / Cl- = 1.36 V,
E°MnO4- /Mn2+ = 1.51 V, E°Cr3+ /Cr = -0.74 V - a)Cl-
- b)Mn2+
- c)Cr
- d)Cr3+
Correct answer is option 'C'. Can you explain this answer?
Using the data given below find out the strongest reducing agent
E°Cr2O4 /Cr3+ = 1.33 V, E°Cl2 / Cl- = 1.36 V,
E°MnO4- /Mn2+ = 1.51 V, E°Cr3+ /Cr = -0.74 V
E°MnO4- /Mn2+ = 1.51 V, E°Cr3+ /Cr = -0.74 V
a)
Cl-
b)
Mn2+
c)
Cr
d)
Cr3+
|
Mohd Haris Ansari answered |
More have negative sing get reducing power is high and if u comfort me or not please refer ncert
A slab consist of two portions of different materials of same thickness and having the conductivities K1 and K2. The equivalent thermal conductivity of the slab is
- a)a
- b)b
- c)c
- d)d
Correct answer is option 'C'. Can you explain this answer?
A slab consist of two portions of different materials of same thickness and having the conductivities K1 and K2. The equivalent thermal conductivity of the slab is
a)
a
b)
b
c)
c
d)
d
|
Moumita Khanna answered |
In parallel combination equivalent conductivity
(As A1=A2).In the preparation of HNO3 we get NO gas by catalytic oxidation of ammonia. The moles of NO produced by the oxidation of two moles of NH3 will be- a)2
- b)3
- c)4
- d)6
Correct answer is option 'A'. Can you explain this answer?
In the preparation of HNO3 we get NO gas by catalytic oxidation of ammonia. The moles of NO produced by the oxidation of two moles of NH3 will be
a)
2
b)
3
c)
4
d)
6
|
Rohit Das answered |
**Explanation:**
**Catalytic Oxidation of Ammonia:**
In the preparation of HNO3, ammonia (NH3) is oxidized to nitrogen monoxide (NO) gas by catalytic oxidation. The reaction can be represented as follows:
4NH3 + 5O2 → 4NO + 6H2O
**Mole Ratio:**
From the balanced chemical equation, we can determine the mole ratio between NH3 and NO.
- According to the balanced equation, 4 moles of NH3 react to produce 4 moles of NO.
- Therefore, the mole ratio of NH3 to NO is 4:4, which simplifies to 1:1.
**Moles of NO produced:**
Given that we are oxidizing 2 moles of NH3, we can use the mole ratio to determine the moles of NO produced.
- Since the mole ratio of NH3 to NO is 1:1, the moles of NO produced will also be 2.
Therefore, the correct answer is option A: 2 moles of NO are produced by the oxidation of two moles of NH3.
**Catalytic Oxidation of Ammonia:**
In the preparation of HNO3, ammonia (NH3) is oxidized to nitrogen monoxide (NO) gas by catalytic oxidation. The reaction can be represented as follows:
4NH3 + 5O2 → 4NO + 6H2O
**Mole Ratio:**
From the balanced chemical equation, we can determine the mole ratio between NH3 and NO.
- According to the balanced equation, 4 moles of NH3 react to produce 4 moles of NO.
- Therefore, the mole ratio of NH3 to NO is 4:4, which simplifies to 1:1.
**Moles of NO produced:**
Given that we are oxidizing 2 moles of NH3, we can use the mole ratio to determine the moles of NO produced.
- Since the mole ratio of NH3 to NO is 1:1, the moles of NO produced will also be 2.
Therefore, the correct answer is option A: 2 moles of NO are produced by the oxidation of two moles of NH3.
Which one plant movement is unidirectional?- a)Phototaxis
- b)Chemotaxis
- c)Both (a) and (b)
- d)Thigmotrophism
Correct answer is option 'C'. Can you explain this answer?
Which one plant movement is unidirectional?
a)
Phototaxis
b)
Chemotaxis
c)
Both (a) and (b)
d)
Thigmotrophism
|
Amrutha Yadav answered |
Phototaxis and Chemotaxis:
Phototaxis and chemotaxis are both plant movements that involve the directional response to environmental stimuli.
Phototaxis:
- Phototaxis is the movement of an organism in response to light stimulus.
- In plants, phototaxis involves the growth of plant parts towards light sources to maximize photosynthesis.
- This movement is unidirectional as plants grow towards the light source.
Chemotaxis:
- Chemotaxis is the movement of an organism in response to chemical stimuli.
- In plants, chemotaxis can involve the growth of roots towards nutrients in the soil.
- This movement is also unidirectional as plants grow towards the source of the chemical stimulus.
Both (a) and (b):
- Both phototaxis and chemotaxis are examples of unidirectional plant movements where the plant parts grow in a specific direction in response to the stimuli.
Thigmotrophism:
- Thigmotrophism is another type of plant movement in response to touch or contact stimuli.
- Unlike phototaxis and chemotaxis, thigmotrophism can involve bidirectional responses where the plant parts can grow towards or away from the touch stimulus.
In conclusion, phototaxis and chemotaxis are examples of unidirectional plant movements where the growth of plant parts is directed towards the source of the stimulus.
Phototaxis and chemotaxis are both plant movements that involve the directional response to environmental stimuli.
Phototaxis:
- Phototaxis is the movement of an organism in response to light stimulus.
- In plants, phototaxis involves the growth of plant parts towards light sources to maximize photosynthesis.
- This movement is unidirectional as plants grow towards the light source.
Chemotaxis:
- Chemotaxis is the movement of an organism in response to chemical stimuli.
- In plants, chemotaxis can involve the growth of roots towards nutrients in the soil.
- This movement is also unidirectional as plants grow towards the source of the chemical stimulus.
Both (a) and (b):
- Both phototaxis and chemotaxis are examples of unidirectional plant movements where the plant parts grow in a specific direction in response to the stimuli.
Thigmotrophism:
- Thigmotrophism is another type of plant movement in response to touch or contact stimuli.
- Unlike phototaxis and chemotaxis, thigmotrophism can involve bidirectional responses where the plant parts can grow towards or away from the touch stimulus.
In conclusion, phototaxis and chemotaxis are examples of unidirectional plant movements where the growth of plant parts is directed towards the source of the stimulus.
Can you explain the answer of this question below:Flame cells and Malpighian tubules are the analogous organ in
- A:
insects and arthropods respectively
- B:
arthropods and echinodermates respectively
- C:
helminths and arthropods with other insect respectively
- D:
arthropods and other insect with helminths respectively
The answer is c.
Flame cells and Malpighian tubules are the analogous organ in
insects and arthropods respectively
arthropods and echinodermates respectively
helminths and arthropods with other insect respectively
arthropods and other insect with helminths respectively
|
Supriya Senapati answered |
In arthropods, excretion takes place through malpighian tubules. In Platyhelminthes animals, specialised cells called flame cells are responsible for osmoregulation and excretion.
These questions consist of two statements each printed as assertion and reason. Whole answering these questions you are required to choose any one of of following responses. Assertion : Plasmids are single stranded extrachromosomal DNA.
Reason : Plasmid are usually present in eukaryotic cells.- a)Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- b)Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- c)Assertion is true but Reason is false.
- d)Both Assertion and Reason are false
Correct answer is option 'D'. Can you explain this answer?
These questions consist of two statements each printed as assertion and reason. Whole answering these questions you are required to choose any one of of following responses.
Assertion : Plasmids are single stranded extrachromosomal DNA.
Reason : Plasmid are usually present in eukaryotic cells.
Reason : Plasmid are usually present in eukaryotic cells.
a)
Both Assertion and Reason are true and Reason is the correct explanation of Assertion
b)
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
c)
Assertion is true but Reason is false.
d)
Both Assertion and Reason are false
|
|
Jyoti Aiims Aspirant answered |
Plasmid is double stranded and found in prokaryotes
Velocity of sound waves in air is 330 m/s. For a particular sound in air a path difference of 40 cm is equivalent to phase difference of 1.6π. The frequency of the wave is- a)165 Hz
- b)150 Hz
- c)660 Hz
- d)330 Hz
Correct answer is option 'C'. Can you explain this answer?
Velocity of sound waves in air is 330 m/s. For a particular sound in air a path difference of 40 cm is equivalent to phase difference of 1.6π. The frequency of the wave is
a)
165 Hz
b)
150 Hz
c)
660 Hz
d)
330 Hz
|
Surya answered |
Option C 660Hz is correct answer... pi=2×π×mu/velocity × X 1.6π=2×π×mu/330×0.4. (40 cm convert to m) calculate this u get the answer. So mu i.e,frequency of wave=660 Hz.
Which one of the following bonds produces a solid that reflects light in the visible region and whose electrical conductivity decreases with temperature and hs high melting point?- a)metallic bonding
- b)van der Waal's bonding
- c)Ionic bonding
- d)covalent bonding
Correct answer is option 'A'. Can you explain this answer?
Which one of the following bonds produces a solid that reflects light in the visible region and whose electrical conductivity decreases with temperature and hs high melting point?
a)
metallic bonding
b)
van der Waal's bonding
c)
Ionic bonding
d)
covalent bonding
|
Shruti Bora answered |
Van der Waal's bonding cannot be the answer as they have low melting point. covalent compounds are not good conductors of electricity. ionic solids do not conduct electricity when they are in solid state. metallic solids are those which conduct electricity and have high melting point. also, their electrical conductivity decreases with increasing temp as drift velocity decreases.
Who had proposed theory of cohesion and adhesion forces?- a)Dixon and Jolly (1894)
- b)Dixon and Benson (1885)
- c)Dixon and Jolly (1950)
- d)Sir Jagdish Chandra Bose (1850)
Correct answer is option 'A'. Can you explain this answer?
Who had proposed theory of cohesion and adhesion forces?
a)
Dixon and Jolly (1894)
b)
Dixon and Benson (1885)
c)
Dixon and Jolly (1950)
d)
Sir Jagdish Chandra Bose (1850)
|
Mamali . answered |
Cohesion tension theory is also known to us, as jolly's theory. This theory describes the movement of water from roots to leaves of a plant . Through osmosis water is carried by xylem from root to leaves of a plant. Water molecules are bonded to each other by hydrogen bond, hence water form a string of molecules during its movement towards xylem . The water molecules stick together and get pulled up by the force called tension . This force is exerted because of the evaporation at the surface of the leaf...
An alternatmg voltage V = V0 sin ωτ is applied across a circuit. As result I = I0sin(ωτ)- π/2) flows ill it. The power consumed per cycle is- a)zero
- b) 0.5 V0I0
- c) 0.707 V0I0
- d) 1.414 V0I0
Correct answer is option 'A'. Can you explain this answer?
An alternatmg voltage V = V0 sin ωτ is applied across a circuit. As result I = I0sin(ωτ)- π/2) flows ill it. The power consumed per cycle is
a)
zero
b)
0.5 V0I0
c)
0.707 V0I0
d)
1.414 V0I0
|
Akhil George answered |
,the current lags the voltage by 90 degree this indicates that the circuit is purely inductive in such a circuit The Power dissipation is equal to zero
Two simple harmonic motions are represented by y1=4sin(πt– π/2) and y2=3cos(4πt). The resultant amplitude is- a)/
- b)1
- c)5
- d)2+√3
Correct answer is 'A'. Can you explain this answer?
Two simple harmonic motions are represented by y1=4sin(πt– π/2) and y2=3cos(4πt). The resultant amplitude is
a)
/
b)
1
c)
5
d)
2+√3
|
Kanak Agrawal answered |
Option 1 is not clear visible .pls send again
Different varieties of Indian mangoes are most popular in Western and some other European countries. The varieties with different flavour, colour, sugar and fleshy content is due to- a)genetic diversity
- b)species diversity
- c)induced mutation
- d)hybridisation
Correct answer is option 'A'. Can you explain this answer?
Different varieties of Indian mangoes are most popular in Western and some other European countries. The varieties with different flavour, colour, sugar and fleshy content is due to
a)
genetic diversity
b)
species diversity
c)
induced mutation
d)
hybridisation
|
Ved Patidar answered |
Genetic diversity and arround 1,000 species are found in India in genetic variation.
In a child of 15 years age, plasma calcium level is diagnosed below optimum level. Which organ is malfunctioning?- a)Thyroid gland
- b)Liver
- c)Parathyroid
- d)Posterior lobe of pituitary
Correct answer is option 'C'. Can you explain this answer?
In a child of 15 years age, plasma calcium level is diagnosed below optimum level. Which organ is malfunctioning?
a)
Thyroid gland
b)
Liver
c)
Parathyroid
d)
Posterior lobe of pituitary
|
Nupur Juyal answered |
Parathyroid gland is responsible for regulation of blood calcium level.Parathormone increases blood calcium level whereas calcitonin decreases the level.
These questions consist of two statements each printed as assertion and reason. Whole answering these questions you are required to choose any one of of following responses.Assertion : In an elastic collision between two bodies. the energy of each body is conserved
Reason : The total energy of an isolated system is conserved.- a)If both the assertion and reason are true and reason explains the assertion
- b)If both the assertion and reason are true but reason does not explain the assertion
- c)If assertion is true but reason is false
- d)If assertion is false but reason is true
Correct answer is option 'D'. Can you explain this answer?
These questions consist of two statements each printed as assertion and reason. Whole answering these questions you are required to choose any one of of following responses.
Assertion : In an elastic collision between two bodies. the energy of each body is conserved
Reason : The total energy of an isolated system is conserved.
Reason : The total energy of an isolated system is conserved.
a)
If both the assertion and reason are true and reason explains the assertion
b)
If both the assertion and reason are true but reason does not explain the assertion
c)
If assertion is true but reason is false
d)
If assertion is false but reason is true
|
Abhimanyu K S answered |
In elastic collision the Total Energy is conserved, But the individual energies are not conserved. During elastic collisions exchange of energy occurs hence individual energy is not conserved. Assertion says energy of both bodies are conserved. Hence its wrong that only TOTAL ENERGY is conserved and not the individual energies.
But the statement 2 is correct as isolated systems never loss or exchange energy, Energy is conserved in isolated systems.
The plants which can withstand with narrow and broad range of temperature tolerance respectively are- a)munotherrnai and stencthermal
- b)stenuthermal and monothermal
- c)stenothermal and eurythermal
- d)stenothermal and mesothermal
Correct answer is option 'C'. Can you explain this answer?
The plants which can withstand with narrow and broad range of temperature tolerance respectively are
a)
munotherrnai and stencthermal
b)
stenuthermal and monothermal
c)
stenothermal and eurythermal
d)
stenothermal and mesothermal
|
Kavya Biradar answered |
Apne NCERT main Sirf do temperature tolerance ke baare man bataya hai Jo ki hai eurythermal and stenothermal Jo tumko maloom hai
There are N cells in the circuit of figure. The emf and internal resistance of each cell is E and r respectively. The points A and B in the circuit divide the circuit into n and (N – n) cells. The current in the circuit is- a)E/r
- b)nE/r
- c)NE/Nr
- d)Zero
Correct answer is option 'A'. Can you explain this answer?
There are N cells in the circuit of figure. The emf and internal resistance of each cell is E and r respectively. The points A and B in the circuit divide the circuit into n and (N – n) cells. The current in the circuit is
a)
E/r
b)
nE/r
c)
NE/Nr
d)
Zero
|
|
Ekta Gupta answered |
The cells are connected in series or parallel. figure is Missing.put the fig.
Flame cells and Malpighian tubules are the analogous organ in- a)insects and arthropods respectively
- b)arthropods and echinodermates respectively
- c)helminths and arthropods with other insect respectively
- d)arthropods and other insect with helminths respectively
Correct answer is option 'C'. Can you explain this answer?
Flame cells and Malpighian tubules are the analogous organ in
a)
insects and arthropods respectively
b)
arthropods and echinodermates respectively
c)
helminths and arthropods with other insect respectively
d)
arthropods and other insect with helminths respectively
|
|
Anmol answered |
In arthropods, excretion takes place through malpighian tubules. In Platyhelminthes animals, specialised cells called flame cells are responsible for osmoregulation and excretion.
Trochlear, trigeminal and glossopharyngeal nerve are respectively
a) IX, V and IV
b) IV, V and X
c) V, IV and IX
d) IV, V and IX
Correct answer is option 'D'. Can you explain this answer?
|
|
Shreya Singh answered |
Option B is correct...1)Olfactory nerve(sensory).2)Optic nerve (sensory).3) Oculomotor nerve (motor).4)Pathetic or Trochlear nerve (motor).5)Trigeminal nerve(mixed).6) Abducens(motor).7)Facial nerve (mixed).8)Vestibule cochlear nerve / Acoustic or Auditory nerve (sensory).9)Glossopharyngeal nerve (mixed).10)Vagus nerve(mixed).11) Spinal accessory or Accessory nerve (motor).12)Hypoglossal nerve (motor).
These questions consist of two statements each printed as assertion and reason. Whole answering these questions you are required to choose any one of of following responses. Assertion : Medulla is considered as a respiratory centre in animals.
Reason : Rate of breathing is regulated by medulla because of the changes in O2content of blood.- a)Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- b)Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- c)Assertion is true but Reason is false.
- d)Both Assertion and Reason are false
Correct answer is option 'A'. Can you explain this answer?
These questions consist of two statements each printed as assertion and reason. Whole answering these questions you are required to choose any one of of following responses.
Assertion : Medulla is considered as a respiratory centre in animals.
Reason : Rate of breathing is regulated by medulla because of the changes in O2content of blood.
Reason : Rate of breathing is regulated by medulla because of the changes in O2content of blood.
a)
Both Assertion and Reason are true and Reason is the correct explanation of Assertion
b)
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
c)
Assertion is true but Reason is false.
d)
Both Assertion and Reason are false
|
|
Anchal Maurya answered |
C is correct answer Medulla doesn't recognise O2 concentration. it can recognise CO2 concentration in blood.
These questions consist of two statements each printed as assertion and reason. Whole answering these questions you are required to choose any one of of following responses.Assertion : If a liquid in a vessel is stirred and left to itself. the motion disappear after few minutes.
Reason : The moving liquid exerts equal and opposite force.- a)If both the assertion and reason are true and reason explains the assertion
- b)If both the assertion and reason are true but reason does not explain the assertion
- c)If assertion is true but reason is false
- d)If assertion is false but reason is true
Correct answer is option 'C'. Can you explain this answer?
These questions consist of two statements each printed as assertion and reason. Whole answering these questions you are required to choose any one of of following responses.
Assertion : If a liquid in a vessel is stirred and left to itself. the motion disappear after few minutes.
Reason : The moving liquid exerts equal and opposite force.
Reason : The moving liquid exerts equal and opposite force.
a)
If both the assertion and reason are true and reason explains the assertion
b)
If both the assertion and reason are true but reason does not explain the assertion
c)
If assertion is true but reason is false
d)
If assertion is false but reason is true
|
|
Anjali Chawla answered |
Option (c) cuz reason for this is Viscosity.It describes the internal friction of a moving fluid. A fluid with large viscosity resist motion becoz its molecular makeup gives it a lot of internal friction!
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