Q&A - Ask Doubts and Get Answers

Sort by :
Clear All
Q
Which of the species is more stable O or N? Nitrogen is more stable than Oxygen due to half-filled electrons in Nitrogen.

Both are active, but O is more active w.r.t. N due to its high electronegativity[ En(O) = 3.5 & En(N) = 3.0 ]. Hence, N is more stable w.r.t. O

You just finished Kinematics

In this chapter, you have completed: 19 concepts 17 doubts More than 30 Questions and Examples In this chapter, firstly you read Concepts of “Kinematics” and then moved to “applications of kinematics”. Apart from this, there are certain tips for you which will be helpful for you to develop a lot of interest in this chapter. There are some examples as well as practise question in each...

What is a cell?

Cell is structural and functional unit of life

 

 

A projectile is thrown at an angle \beta with vertical .It reaches a maximum height H . The time taken to reach the highest point of its path is 

@Harshit As we have learned Time of Flight - Time for which projectile remains in the air above the horizontal plane. - wherein SO  Time taken to reach highest point =       Time taken to reach highest point = 

Equation of trajectory of a projectile is given by y = -x^2 +10 x , where x and y are in metres and x is along horizontal and y is vertically upward and particles is projected from origin .Then which of the following option is incorrect 

 

A.

Initial velocity of particle is \sqrt{505}m/s

B.

horizontal range is 10 m 

C.

Maximum range is 10 m 

D.

Angle of projection with horizontal is \tan ^{-1} (-1 )

505m/s
@Harshit Equation of path of a projectile - it is equation of parabola     Acceleratio due to gravity     initial velocity Angle of projection   - wherein Path followed by a projectile is parabolic is nature.     Compare this with    Maximum height H =       
Is retrogressive metamorphosis is shown only by Urochordates... or any other class performs.....
@Vasudevan.G  Retrogressive Metamorphosis is shown by Urochordates and Herdmania.

A person A is moving along east and B is moving along north. Then relative velocity of A with respect to B is (V_{A}=10\, m/s\, ,\; V_{B}=10\sqrt{3}\, m/s)

    =    -      = 

A ball is thrown vertically upward with a velocity of 20 ms-1 from a top of a multistory  building.The hight of the  point from where  the ball is thrown is 25 m from the ground. The hight to which the ball rises from the ground and time taken before the ball hits the ground are (g:=10 ms-2)

  Maxmium height from the ground :20 + 25 = 45m Time to reach ground S=-25m, u=20 ms-1, a =-10 m/s2

Pinus seed cannot germinate and establish without fungal associaton. This is because:

  • Option 1)

    its embryo is immature

  • Option 2)

    it has obligate association with mycorrhizae

  • Option 3)

    it has a very hard seed coat

  • Option 4)

    its seed contain inhibitors that prevents germinatiom.

     

Pinus plant is devoid of root hair. So it has difficulty in absorbing water from the soil. A seed can only germinate after absorbing adequate amount of water. Hence, by the symbiotic association with fungi, pinus seed can germinate and grow. So the answer is option 2

 

In which case change in entropy is negative?

  • Option 1)

    Evapouration of water

  • Option 2)

    Expansion of a gas at constant temperature

  • Option 3)

    Sublimation of solid to gas

  • Option 4)

    2H_{(g)} \rightarrow H_2_{(g)}

  Gibb's free energy (? G) -   - wherein Gibb's free energy enthalpy of reaction entropy temperature       degree of randomness decreases  entropy decreases and is negative.Option 1)Evapouration of waterOption 2)Expansion of a gas at constant temperatureOption 3)Sublimation of solid to gasOption 4)

Drug called 'Heroin' is synthesized by:

 

  • Option 1)

    methylation of morphine

  • Option 2)

    acetylation of morphine

  • Option 3)

    glycosylation of morphine

  • Option 4)

    nitration of morphine

  Heroin - Commonly called smack is chemically diacetylmorphine which is a white, odourless, bitter crystalline compound. - wherein   This is obtained by acetylation of morphine, which is extracted from the latex of poppy plant Papaver somniferum Generally taken by snorting and injection, heroin is a depressant and slows down body functions.      Herion is a chemically diacetylmorphine...

Which of the following equipments is essentially required for growing microbes on a large scale, for industrial production of enzymes?

 

  • Option 1)

    BOD incubator

  • Option 2)

    sludge digestor 

  • Option 3)

    Industrial oven

  • Option 4)

    Bioreactor

  Bioreactors - Bioreactors are stirrer cylindrical tanks. The stirrer provides movement, even mixing and O2 availability throughout the bioreaction. - wherein Bioreactors can be 100 to 1000 lt for large production.       In order to produce large quantities of the enzymes , bioreactors are used wherein large volumers of culture can be processed or provides optimal conditions for achieving...

Which of the following muscular disorder is inherited?

 

  • Option 1)

    Tetany

  • Option 2)

    Muscular dystrophy

  • Option 3)

    Myasthenia gravis

  • Option 4)

    Botulism

 

G jk hbvffvbbvhvhdsa by yu bg ds.  By h juju fdg. M.l. n.  Df 754iivf. Bbm..

 

Match the following:

(a) Pure Nitrogen                (i) Chlorine

(b) Haber process              (ii) Sulphuric Acid

(c) Contact process           (iii) Ammonia

(d) Deacon's process        (iv) Sodium azide or Barium Azide

Which of the following is the correct option?

(a)    (b)    (c)    (d)

  • Option 1)

    (i)    (ii)    (iii)    (iv)

  • Option 2)

    (ii)    (iv)    (i)    (iii)

  • Option 3)

    (iii)    (iv)    (ii)    (i)

  • Option 4)

    (iv)    (iii)    (ii)    (i)

Option 4 a) Pure Nitrogen  Sodium azide  or Barium azide  b) Haber process  Making ammonia                                        c) Contact process  producing sulphuric acid  d) Deacon's process  Pruduces  gas                                              Option 1)(i)    (ii)    (iii)    (iv)Option 2)(ii)    (iv)    (i)    (iii)Option 3)(iii)    (iv)    (ii)    (i)Option 4)(iv)    (iii)    (ii)    (i)

The mixture that forms maximum boiling azeotrope is:

  • Option 1)

    Water + Nitric Acid

  • Option 2)

    Ethanol + Water

  • Option 3)

    Acetone + Carbon disulphide

  • Option 4)

    Heptane + Octane

The Solutions that show large negative deviation from Raoult's law from maximum boiling azeotrope at a specific combination. Nitric acid and water is the example of this class of azeotrope.  68% Nitric acid + 32% by mass with a boiling point of 393.5 K.    Option 1)Water + Nitric AcidOption 2)Ethanol + WaterOption 3)Acetone + Carbon disulphideOption 4)Heptane + Octane

Among the following, the one that is not a greenhouse gas is:

  • Option 1)

    nitrous oxide

  • Option 2)

    methane

  • Option 3)

    ozone

  • Option 4)

    sulphur dioxide

 
N2O (Nitrous oxide) CH4 (Methane) O3 (Ozone) All the above are greenhouse gases but SO2  is not greenhouse gas.  Option 1) nitrous oxide Option 2) methane Option 3) ozone Option 4) sulphur dioxide

The correct structure of tribromooctaoxide is:

 

  • Option 1)

  • Option 2)

  • Option 3)

  • Option 4)

option 1 ,because it is not an ion

The number of sigma (\sigma) and pi(\pi) bonds in pent-2-en-4-yne is:

  • Option 1)

    10 \sigma bonds and 3 \pi bonds

  • Option 2)

    \sigma bonds and 5 \pi bonds

  • Option 3)

    11 \sigma bonds and 2 \pi bonds

  • Option 4)

    13 \sigma bonds and no \pi bonds

Option 1 Structure of pent-2-en-4-yne Here there are 10  bonds  and  bonds And 3  bonds   and Option 1)10  bonds and 3  bondsOption 2)8  bonds and 5  bondsOption 3)11  bonds and 2  bondsOption 4)13  bonds and no  bonds

An alkane "A" on reaction with O3 and Zn-H2O gives propane and ethanal in equimolar ratio. Addition of HCl to Alkane "A" gives "B" as the major product. The structure of the product "B" is

  • Option 1)

  • Option 2)

  • Option 3)

  • Option 4)

This oxidation of alkene occurs at the double bond. Thus, propane & ethanol must combine to give the alkene             (Propanone)                                                                                                       Now this reacts with HCl to form B as follows:                                                                         ...

Which of the following acts as a circuit protection device ? 

 

  • Option 1)

    conductor 

  • Option 2)

    inductor 

  • Option 3)

    switch 

  • Option 4)

    fuse 

fuse Option 1)conductor Option 2)inductor Option 3)switch Option 4)fuse 
Exams
Articles
Questions