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Sickle cell anaemia is an example of
  • a)
    Epistasis
  • b)
    Codominance
  • c)
    Pleiotropy
  • d)
    Incomplete dominance
Correct answer is option 'B'. Can you explain this answer?

Rocky Handsome answered
Sickle cell disease is a classic example of pleiotropy. This disease develops in persons carrying two defective alleles for a blood protein, beta-hemoglobin. Mutant beta-hemoglobins are misaligned inside a blood cell and cause misshapen red blood cells at low oxygen concentrations.

In a male human being, sperms contain autosomes and
  • a)
    only Y-chromosome
  • b)
    only X-chromosome
  • c)
    both X- and Y-chromosome
  • d)
    either X- and Y-chromosome
Correct answer is option 'C'. Can you explain this answer?

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Normality of 0.3 M H3PO4 solution is
  • a)
    0.3 N
  • b)
    0.6 N
  • c)
    0.9 N
  • d)
    0.12N
Correct answer is option 'C'. Can you explain this answer?

Ayush Chavan answered
For acids,
Normality = molarity x basicity
Now, basicity of H3PO4 = 3
So, Normality = 0.3 x 3 = 0.9

Father of genetics is
  • a)
    Mendel
  • b)
    Morgan
  • c)
    Muller
  • d)
    Hugo de vries
Correct answer is option 'A'. Can you explain this answer?

Subhash Rowdy answered
Father of modern genetics is Mendel. and father of experimental genetics is T H. morgan

The frenulum is the membrane attached to the inferior surface of the _____.
  • a)
    tongue
  • b)
    stomach
  • c)
    lips
  • d)
    liver
Correct answer is option 'A'. Can you explain this answer?

Lalit Yadav answered
The inferior surface of the tongue is connected to the floor of the mouth by a median fold of mucous membrane, the frenulum. The submandibular duct opens on an elevation, the sublingual papilla, on the sides of the frenulum.

Photoelectric current can be increased by using
  • a)
    Higher frequency radiation
  • b)
    Higher intensity radiation
  • c)
    Higher work function metal plates
  • d)
    None of the above is suitable method
Correct answer is option 'B'. Can you explain this answer?

Harsh Dubey answered
Higher intensity means we are increasing both frequency and Kinetic energy of the photons so no of electrons ejected is directly proportional to the intensity of light emitted .

Which of the following IUPAC names is correct?
  • a)
    2-Methyl-3-ethylpentane
  • b)
    3-Ethyl-2-methylpentane
  • c)
    2-Ethyl-3-methylpentane
  • d)
    3-Methyl-2-ethylpentane
Correct answer is option 'B'. Can you explain this answer?

Meera Singh answered
If there are two or more different substituents they are listed in alphabetical order using the base name (ignore the prefixes). The only prefix which is used when putting the substituents in alphabetical order.

Cyclotron is used to accelerate
  • a)
    electrons
  • b)
    neutrons
  • c)
    positive ions
  • d)
    negative ions
Correct answer is option 'C'. Can you explain this answer?

Wahid Khan answered
Cyclotron accelerates heavy positively charged particles which are used in nuclear experiments.

The centripetal force that is provided to the charged particle to move inside the cyclotron is due to varying electric field. The applied voltage around the Dee’s of cyclotron is too high, which forces the charged particles like alpha particle or protons etc. to be accelerated at very high speed.

The pink colour of phenolphthalein, in alkaline medium, is due to
  • a)
    OH⁻ ion
  • b)
    neutral form
  • c)
    positive ion
  • d)
    negative ion
Correct answer is option 'D'. Can you explain this answer?

Rohit Shah answered
It is a weak acid, which can lose H+ ions in solution. The phenolphthalein molecule is colorless, and the phenolphthalein ion is pink.When a base is added to the phenolphthalein, the molecule β‡Œ ions equilibrium shifts to the right, leading to more ionization as H+ ions are removed.

In coelenterates,the mouth of medusa is located on:
  • a)
    manubrium
  • b)
    velum
  • c)
    hypostome
  • d)
    basal disc
Correct answer is option 'A'. Can you explain this answer?

Rohan Singh answered
Medusa has a bowl or umbrella shaped body with marginal tentacles and mouth is centrally located in a projection called manubrium on the ventral concave surface. Medusae are generally motile and concerned with sexual reproduction.

Complete the analogous pair.
211 : 333 :: 356 : ?
  • a)
    358
  • b)
    329
  • c)
    423
  • d)
    388
Correct answer is option 'D'. Can you explain this answer?

Surya answered
Solution is summing up the numbers.. 1st set; 2 1 1=4 and 3 3 3=9. totally=9-4=5 2nd set; 3 5 6=14. 14 5=19 so we want the number which add they give out 19 so the answer is D only.. 3 8 8=19. and so finally 19-14=5.. so 1 set = 2 set so option D correct proved...πŸ‘..hope it helps u and plz don't repeated again...

Which one has maximum biomass?
  • a)
    Pond ecosystem
  • b)
    Lake ecosystem
  • c)
    Glassland ecosystem
  • d)
    Forest ecosystem
Correct answer is option 'D'. Can you explain this answer?

Wahid Khan answered
Biomass refers to the amount of living organic matter. Forest ecosystem have the maximum biomass, because it includes organisms of all tropic levels as compared to pond, lake or grassland ecosystem. In forest ecosystems productivity is also high that contributes to maximum biomass.

α- particle is equivalent to
  • a)
    Proton
  • b)
    Electron
  • c)
    Neutron
  • d)
    Helium nucleus
Correct answer is option 'D'. Can you explain this answer?

Wahid Khan answered
Positively charged particle emitted by various radioactive materials during decay. It consists of two neutrons and two protons, and is thus identical to the nucleus of a helium atom. The rest mass of the alpha particle amounts to 6.64424Β·10-27 kg, or 3.7273Β·109 eV.

In a sponge, digestion takes place in
  • a)
    Paragastric cavity/Spongocoel
  • b)
    Osculum
  • c)
    Ostium
  • d)
    Food vacuoles
Correct answer is option 'D'. Can you explain this answer?

Rajeev Saxena answered
Then these food materials are taken up by Choanocytes into their food vacuoles and then the digestion takes place inside these food vacuoles. It shows that digestion in sponges is INTRACELLULAR. And so the digestion takes place completely in CHOANOCYTE CELLS

When a wire is stretched and its radius becomes r/2, then its resistance will be
  • a)
    16 R
  • b)
    4 R
  • c)
    2 R
  • d)
    0
Correct answer is option 'A'. Can you explain this answer?

Wahid Khan answered
In strectching condition Resistance is inversely proportional to r4Β since R is inversely proportional to A2Β and area is directly proportional to r2(in sterching condition) so the ans should be A option which is 16 R

Below are the statements followed by four conclusions numbered I,II,III and IV. You have to consider the statements and the following conclusions and decide which of the conclusion(s) follows the statement(s).
Statements :
a. Some books are pens.
b. Some pens are watches.
c. All watches are radios.
Conclusions :
I. Some radios are watches.
II. Some radios are pens.
III. Some watches are books.
IV. Some books are watches.
  • a)
    All follow
  • b)
    only conclusions I and III follow.
  • c)
    None of these
  • d)
    only conclusions II and IV follow.
Correct answer is option 'C'. Can you explain this answer?

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A tuning fork produces certain sound waves in a medium. If temperature of the medium changes, which one of the following will change.
  • a)
    Amplitude
  • b)
    Frequency
  • c)
    Wave length
  • d)
    Time period
Correct answer is 'C'. Can you explain this answer?

Wahid Khan answered
As velocity is directly proportional to temperature, and
frequency x wavelength =velocity,
Frequency is the property of source so that it remains constant, but wavelength will change.

The intensive property among these quantities is
  • a)
    mass
  • b)
    volume
  • c)
    enthalpy
  • d)
    mass/volume
Correct answer is option 'D'. Can you explain this answer?

Gaurav Kumar answered
An intensive property is a bulk property, meaning that it is a local physical property of a system that does not depend on the system size or the amount of material in the system. Examples of intensive properties include temperature, T; refractive index, n; density, ρ; and hardness of an object, η.

Glass Rope sponge is
  • a)
    Hyalonema
  • b)
    Euplectella
  • c)
    Scypha
  • d)
    Spongilla
Correct answer is option 'A'. Can you explain this answer?

Option 1 is correct becose i will eliminate one by one euplectella is also called as veanus flower basket, scypha is also called sycon or crown sponge, spongilla is fresh water spong,hylonema is called glass rope sponge.

Oswald Tippo's classification is based on
  • a)
    development of embrayos
  • b)
    presence or absence of vascular tissues
  • c)
    development of plantation
  • d)
    both 'A' and 'B'
Correct answer is option 'D'. Can you explain this answer?

Gaurav Kumar answered
In 1942, Oswald Tippo proposed a modern classification of the plant kingdom. He divided entire plant Kingdom into two major groups, Thallophyta and Embryophyta on the basis of absence and presence of an embryo.

The equivalent capacitance between a and b for the combination of capacitors shown in figure where all capacitances are in microfarad is
  • a)
    6.0 μ F
  • b)
    4.0 μ F
  • c)
    2.0 μ F
  • d)
    3.0 μ F
Correct answer is option 'A'. Can you explain this answer?

Anchal Maurya answered
We calculate parallel combination as c=c1+c2
so c'=1+3=4 micro F
1/c"=1/4+1/4=1/2
c"=2micro F
we calculate series combination as 1/c=1/c1+1/c2
c"'=4+2=8micro F
1/c""=1/8+1/8=1/4
c""=4 micro F
so C=4+2=6 micro F
correct answer is A

Electrons will first enter into the orbital with the set of quantum numbers
  • a)
    n = 5, l = 0
  • b)
    n = 4, l = 1
  • c)
    n = 3, l = 2
  • d)
    any of these
Correct answer is option 'C'. Can you explain this answer?

Wahid Khan answered
We fill up electron in increasing energy order.in which electronic configuration n+l value is greater, it's energy also will be greater.but here n+l value is same.so we shall consider n(principle quantum number).in which electronic configuration n value is greater it's energy also will bΓ« greater.there for option C is correct.

If in a container, no mass and heat exchange occurs, then it constitutes a/an
  • a)
    open system
  • b)
    closed system
  • c)
    isolated system
  • d)
    imaginary system
Correct answer is option 'B'. Can you explain this answer?

Mokshita Sethi answered
it must be an isolated system ..because in closed one no mass exachange occurs but heat exchange takes place... where as in isolated one neither mass nor heat exchange takes place.... what is asked in question m not able to understand

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