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Medical
132 Views   |   3 months, 1 week ago
can I get chapter wise practise questions???? and not unit wise...I wanted to solve questions on morphology and not the whole structural organisation.

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S safeer
Answered 3 months, 1 week ago
  @Vaibhavi Gat  There is a practice question for each concept
Medical
11 Views   |   3 months, 1 week ago

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B Bishnu Parida
Answered 2 weeks, 3 days ago
Indented key - *These are known as yoked key .                         *They wont go taxa.                         *They give visual presentation of the group.                         *The indent key have the two lead of each couplet separated by the couplet following the first lead that making it difficult to compare                           with the...
Medical
13 Views   |   3 months, 1 week ago

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B Bishnu Parida
Answered 2 weeks, 3 days ago
Apospory is the development of gametophyte directly from a sporophyte without occurrence of meiosis or spore formation. ... Apogamy on the other hand is the development of an embryo without fertilization especially the development of some ferns of a sporophyte from the gametophyte without fertilization.
Medical
109 Views   |   3 months, 3 weeks ago
IMG_20180811_155143.jpg

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V Vikram
Answered 3 months, 3 weeks ago
I think the answer is B
Medical
68 Views   |   3 months, 3 weeks ago
meaning of entropy in biology

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B Bishnu Parida
Answered 2 weeks, 3 days ago
Entropy is also used to mean disorganization or disorder. J. Willard Gibbs, the nineteenth century American theoretical physicist, called it "mixedupness." The American Heritage Dictionary gives as the second definition of entropy, "a measure of disorder or randomness in a closed system."
Medical
7 Views   |   3 months, 3 weeks ago

 

Option 1) S- shaped           Option 2) J-shaped

Option 3) Z-shaped            Option 4) All of these

Medical
9 Views   |   4 months ago

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B Bishnu Parida
Answered 2 weeks, 3 days ago
Hemolymph, or haemolymph, is a fluid, analogous to the blood in vertebrates, that circulates in the interior of the arthropod body remaining in direct contact with the animal's tissues. It is composed of a fluid plasma in which hemolymph cells called hemocytes are suspended.
Medical
336 Views   |   4 months, 3 weeks ago

The areas of Central and South America and Iceland of West Indies include in _____________realm:        

  • Option 1)

    Ethiopian Realm

  • Option 2)

    Oriental Realm

  • Option 3)

    Australian Realm

     

  • Option 4)

    Neotropical Realm

 

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A aarushi
Answered 4 months, 3 weeks ago

neotropical realm

Medical
584 Views   |   5 months, 1 week ago

For a given reaction, \DeltaH = 35.5 kJ mol-1 and \DeltaS = 83.6 JK-1 mol-1. The reaction is spontaneous at : (Assume that \DeltaH and \DeltaS do not vary with temperature)

  • Option 1)

    T < 425 K

  • Option 2)

    T > 425 K

  • Option 3)

    all temperatures

  • Option 4)

    T > 298 K

 

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S Satyajeet kumar
Answered 5 months, 1 week ago
Since,  for spontaneous reaction  i.e.  Therefore,  Option 1) T < 425 K This option is incorrect. Option 2) T > 425 K This option is correct. Option 3) all temperatures This option is incorrect. Option 4) T > 298 K This option is incorrect.
Medical
349 Views   |   5 months, 1 week ago

Which one of the following nitro-compounds does not react with nitrous acid?

  • Option 1)

  • Option 2)

  • Option 3)

  • Option 4)

 

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S Satyajeet kumar
Answered 5 months, 1 week ago
  Victor meyer Test:   group  present at a carbon atom do not reacts with  Option 1) This option is incorrect. Option 2) This option is incorrect. Option 3) This option is correct. Option 4) This option is incorrect.
Medical
99 Views   |   5 months, 2 weeks ago

Which one of the followng statements related to lanthanons is incorrect?

  • Option 1)

    Europium shows +2 oxidation state.

  • Option 2)

    The basicity decreases as the ionic radius decreases from Pr to Lu.

  • Option 3)

    All the lanthanons are much more reactive than aluminium.

  • Option 4)

    Ce(+4) solutions are widely used as oxidizing agent in volumetric analysis

 

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P Plabita
Answered 5 months, 1 week ago
As we discussed in the concept  Reactivity of lanthanons matches with alkaline metals specially barium due to being the number of same period Option 1) Europium shows +2 oxidation state. Option is incorrect Option 2) The basicity decreases as the ionic radius decreases from Pr to Lu. Option is incorrect Option 3) All the lanthanons are much more reactive than aluminium. Option is...
Medical
361 Views   |   5 months, 2 weeks ago

The decomposition of phosphine (PH3) on tungsten at low pressure is a first-order reaction. It is because the

  • Option 1)

    rate is proportional to the surface coverage

  • Option 2)

    rate is inversely proportional to the surface coverage

  • Option 3)

    rate is independent of the surface coverage

  • Option 4)

    rate of decomposition is very slow

 

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P Plabita
Answered 5 months, 1 week ago
As we Discussed in Concept   The decomposition of PH3 on tungsten at low pressure is a first order reaction if because rate is Proportional to the surface coverage  Option 1) rate is proportional to the surface coverage Option is Correct Option 2) rate is inversely proportional to the surface coverage Option is incorrect Option 3) rate is independent of the surface coverage Option is...
Medical
328 Views   |   5 months, 2 weeks ago

The van't Hoff factor (i) for a dilute aqueous solution of the strong electrolyte barium hydroxide is

  • Option 1)

    0

  • Option 2)

    1

  • Option 3)

    2

  • Option 4)

    3

 

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P Plabita
Answered 5 months, 1 week ago
As we learned in concept Clearly van't Hoff factor is 3 Option 1) 0 This option is incorrect. Option 2) 1 This option is incorrect. Option 3) 2 This option is incorrect. Option 4) 3 This option is correct.
Medical
238 Views   |   5 months, 2 weeks ago

Which of the following fluoro-compounds is most likely to behave as a Lewis base?

  • Option 1)

    BF3

  • Option 2)

    PF3

  • Option 3)

    CF4

  • Option 4)

    SiF4

 

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P Plabita
Answered 5 months, 1 week ago
  behave like lewis base because it has one pair of electron. Option 1) BF3 this is the incorrect option Option 2) PF3 this is the correct option Option 3) CF4 this is the incorrect option Option 4) SiF4 this is the incorrect option
Medical
111 Views   |   5 months, 2 weeks ago

Natural rubber has:

  • Option 1)

    All cis- onfiguration

  • Option 2)

    All trans-configuration

  • Option 3)

    Alternate cis- and trans-configuration

  • Option 4)

    Random cis- and trans-configuration

 

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A aadil.khan
Answered 5 months, 1 week ago
  Natural Rubber/ cis-1 4-polyisoprene - - It's an addition polymer of isoprene (2-methyl-1, 3-butadiene). - Chains are held together by weak van der waal's interaction. - wherein - Sticky material.     Option 1) All cis- onfiguration Option 2) All trans-configuration Option 3) Alternate cis- and trans-configuration Option 4) Random cis- and trans-configuration
Medical
98 Views   |   5 months, 2 weeks ago

Testing Question

  • Option 1)

    A

  • Option 2)

    B

  • Option 3)

    C

  • Option 4)

    D

 

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G gaurav
Answered 5 months, 1 week ago
Option 1) A Option 2) B Option 3) C Option 4) D
Medical
119 Views   |   5 months, 2 weeks ago

Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field?

  • Option 1)

    Na

  • Option 2)

    K

  • Option 3)

    Rb

  • Option 4)

    Li

 

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P Plabita
Answered 5 months, 1 week ago
Li+ being smallest has maximum charge density   Li+ is most heavily hydrated among   Option 1) Na this is the incorrect option Option 2) K this is the incorrect option Option 3) Rb this is the incorrect option Option 4) Li this is the correct option
Medical
531 Views   |   5 months, 2 weeks ago

Which of the following biphenyl is optically active?

  • Option 1)

  • Option 2)

  • Option 3)

  • Option 4)

 

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A aadil.khan
Answered 5 months, 1 week ago
As we learnt in Optically active compound - Those compounds having capacity to rotate plane polarised light is called optically active compound. - wherein     This piphenyl is non planar and having absence of plane of symmetry hence it is an optically active compound. Option 1) This option is incorrect Option 2) This option is correct Option 3) This option is correct Option 4) This...
Medical
230 Views   |   5 months, 2 weeks ago

A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy \DeltaU of the gas in joules will be :

  • Option 1)

    1136.25 J

  • Option 2)

    -500 J

  • Option 3)

    -505 J

  • Option 4)

    +505 J

 

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S satyajeet
Answered 5 months, 1 week ago
Word done, Now, for adiabate process, f=0   Option 1) 1136.25 J This option is incorrect. Option 2) -500 J This option is incorrect. Option 3) -505 J This option is correct. Option 4) +505 J This option is incorrect.
Medical
94 Views   |   5 months, 2 weeks ago

The total radiant energy per unit area, normal to the direction of incidence, received at a distance R from the centre of a star of radius r, whose outer surface radiates as a black body at a temperature T K is given by

(where \sigma is Stefan's constant)

  • Option 1)

    \frac{4\sigma\pi\text{r}^{2}\text{T}^{4}}{\text{R}^{2}}

  • Option 2)

    \frac{\sigma\text{r}^{2}\text{T}^{4}}{\text{R}^{2}}

  • Option 3)

    \frac{\sigma\text{r}^{2}\text{T}^{4}}{4\pi\text{R}^{2}}

  • Option 4)

    \frac{\sigma\text{r}^{4}\text{T}^{4}}{\text{R}^{4}}

    (Where \sigma is Stefan's constant)

 

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S SudhirSol
Answered 5 months, 2 weeks ago
As we have leaqrned @2747   Power of radiation  Intensity of this energy at a distance R is  Option 1) Option 2) Option 3) Option 4) (Where is Stefan's constant)
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