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Biology

Darwin's finches represents:

BiologyGeneral

  1. climatic variation    
  2. geographical isolation    
  3. reproductive isolation    
  4. morphological variation    

    Answer:The correct answer is: geographical isolation

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    Organisms which obtain energy by the oxidation of reduced inorganic compounds are called:

       

    Organisms which obtain energy by the oxidation of reduced inorganic compounds are called:

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    Finding of Miller's experiment on origin of life has provided evidence for:

       

    Finding of Miller's experiment on origin of life has provided evidence for:

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    The number of codons that code different amino acids is -

       

    The number of codons that code different amino acids is -

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    Assertion (A):If a>0,b>0 and c>0, then (a+b+c)(1a+1b+1c)9Reason (R): For positive numbers a, b, c, AMGM

    AMGM=1a+1b+1c3111--b¯a.c(1)D:x2-3x-4<0(x+1)(x-4)<01<x<4x2-3x+2>0Rejectx-2)(x-1)>0=x<1arx>2(a+b+c)3(abc)13(2)multiply (1) and (2)  

    Assertion (A):If a>0,b>0 and c>0, then (a+b+c)(1a+1b+1c)9Reason (R): For positive numbers a, b, c, AMGM

    maths-General
    AMGM=1a+1b+1c3111--b¯a.c(1)D:x2-3x-4<0(x+1)(x-4)<01<x<4x2-3x+2>0Rejectx-2)(x-1)>0=x<1arx>2(a+b+c)3(abc)13(2)multiply (1) and (2)  
    General
    maths-

    The length of the chord joining the points (4cosθ, 4sinθ) and (4cosθ+60°, 4sin(θ+60°)of the circle x2+y2=16 is

       

    The length of the chord joining the points (4cosθ, 4sinθ) and (4cosθ+60°, 4sin(θ+60°)of the circle x2+y2=16 is

    maths-General
       
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    Observe the following statements and choose correct answer Statement-I:A particle p moves along a straight line, starting from a fixed point ‘O’, obeying s=16+48t-t3.the direction of p when t=5 is along OP¯ Statement-II: For a particle moving on a line, if velocity v<0 then the body moves towards the initial point.

    Statement -I:    

    Observe the following statements and choose correct answer Statement-I:A particle p moves along a straight line, starting from a fixed point ‘O’, obeying s=16+48t-t3.the direction of p when t=5 is along OP¯ Statement-II: For a particle moving on a line, if velocity v<0 then the body moves towards the initial point.

    maths-General
    Statement -I:    
    General
    maths-

    Statement ‐ I : The equation zz¯+a¯z+az¯+λ=0 where a is a complex number, represents a circle in Argand plane if λ is real. Statement ‐II : The radius of the circle zz¯+a¯z+az¯+λ=0 is λ-aa¯

    Result    

    Statement ‐ I : The equation zz¯+a¯z+az¯+λ=0 where a is a complex number, represents a circle in Argand plane if λ is real. Statement ‐II : The radius of the circle zz¯+a¯z+az¯+λ=0 is λ-aa¯

    maths-General
    Result    
    General
    biology

    The third cleavage in frog's development is

    The third cleavage in frog's development is

    biologyGeneral
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    biology

    The reason why the right kidney is slightly lower than the left is:

    Excretion involves the processes in which substances of no further use or those present in excess qualities are thrown out of the body.

    The reason why the right kidney is slightly lower than the left is:

    biologyGeneral
    Excretion involves the processes in which substances of no further use or those present in excess qualities are thrown out of the body.
    General
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    This happens if the proximal convoluted tubule is removed from nephron:

    This happens if the proximal convoluted tubule is removed from nephron:

    biologyGeneral
    General
    physics-

    To double the volume of a given mass of an ideal gas at 27 ℃ keeping the pressure constant, one must raise the temperature in degree centigrade to

    V proportional to T rightwards double arrow fraction numerator V subscript 1 end subscript over denominator V subscript 2 end subscript end fraction equals fraction numerator T subscript 1 end subscript over denominator T subscript 2 end subscript end fraction rightwards double arrow fraction numerator V over denominator 2 V end fraction equals fraction numerator open parentheses 273 plus 27 close parentheses over denominator T subscript 2 end subscript end fraction equals fraction numerator 300 over denominator T subscript 2 end subscript end fraction
    rightwards double arrow T subscript 2 end subscript equals 600 K equals 327 ℃

    To double the volume of a given mass of an ideal gas at 27 ℃ keeping the pressure constant, one must raise the temperature in degree centigrade to

    physics-General
    V proportional to T rightwards double arrow fraction numerator V subscript 1 end subscript over denominator V subscript 2 end subscript end fraction equals fraction numerator T subscript 1 end subscript over denominator T subscript 2 end subscript end fraction rightwards double arrow fraction numerator V over denominator 2 V end fraction equals fraction numerator open parentheses 273 plus 27 close parentheses over denominator T subscript 2 end subscript end fraction equals fraction numerator 300 over denominator T subscript 2 end subscript end fraction
    rightwards double arrow T subscript 2 end subscript equals 600 K equals 327 ℃
    General
    maths-

    The function f left parenthesis x right parenthesis equals sin invisible function application fraction numerator pi x over denominator 2 end fraction plus 2 cos invisible function application fraction numerator pi x over denominator 3 end fraction minus tan invisible function application fraction numerator pi x over denominator 4 end fraction is period with period

    Period of sin invisible function application fraction numerator pi x over denominator 2 end fraction equals fraction numerator 2 pi over denominator pi divided by 2 end fraction equals 4
    Period of cos invisible function application fraction numerator pi x over denominator 3 end fraction equals fraction numerator 2 pi over denominator pi divided by 3 end fraction equals 6
    Period of tan invisible function application fraction numerator pi x over denominator 4 end fraction equals fraction numerator pi over denominator pi divided by 4 end fraction equals 4
    thereforePeriod of f left parenthesis x right parenthesis equals L.C.M. of (4, 6, 4) = 12

    The function f left parenthesis x right parenthesis equals sin invisible function application fraction numerator pi x over denominator 2 end fraction plus 2 cos invisible function application fraction numerator pi x over denominator 3 end fraction minus tan invisible function application fraction numerator pi x over denominator 4 end fraction is period with period

    maths-General
    Period of sin invisible function application fraction numerator pi x over denominator 2 end fraction equals fraction numerator 2 pi over denominator pi divided by 2 end fraction equals 4
    Period of cos invisible function application fraction numerator pi x over denominator 3 end fraction equals fraction numerator 2 pi over denominator pi divided by 3 end fraction equals 6
    Period of tan invisible function application fraction numerator pi x over denominator 4 end fraction equals fraction numerator pi over denominator pi divided by 4 end fraction equals 4
    thereforePeriod of f left parenthesis x right parenthesis equals L.C.M. of (4, 6, 4) = 12
    General
    maths-

    The value of k, for which left parenthesis cos invisible function application x plus sin invisible function application x right parenthesis to the power of 2 end exponent plus k sin invisible function application x cos invisible function application x minus 1 equals 0 is an identity, is

    Given, left parenthesis cos invisible function application x plus sin invisible function application x right parenthesis to the power of 2 end exponent plus k sin invisible function application x cos invisible function application x minus 1 equals 0 comma for all x
    Þ cos to the power of 2 end exponent invisible function application x plus sin to the power of 2 end exponent invisible function application x plus 2 cos invisible function application x sin invisible function application x plus k sin invisible function application x cos invisible function application x minus 1 equals 0 comma for all x
    Þ left parenthesis k plus 2 right parenthesis cos invisible function application x sin invisible function application x equals 0 comma for all x Þ k plus 2 equals 0 Þ k equals negative 2

    The value of k, for which left parenthesis cos invisible function application x plus sin invisible function application x right parenthesis to the power of 2 end exponent plus k sin invisible function application x cos invisible function application x minus 1 equals 0 is an identity, is

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    Given, left parenthesis cos invisible function application x plus sin invisible function application x right parenthesis to the power of 2 end exponent plus k sin invisible function application x cos invisible function application x minus 1 equals 0 comma for all x
    Þ cos to the power of 2 end exponent invisible function application x plus sin to the power of 2 end exponent invisible function application x plus 2 cos invisible function application x sin invisible function application x plus k sin invisible function application x cos invisible function application x minus 1 equals 0 comma for all x
    Þ left parenthesis k plus 2 right parenthesis cos invisible function application x sin invisible function application x equals 0 comma for all x Þ k plus 2 equals 0 Þ k equals negative 2
    General
    maths-

    If A plus B plus C equals 27 0 to the power of o end exponent comma then cos invisible function application 2 A plus cos invisible function application 2 B plus cos invisible function application 2 C plus 4 space sin invisible function application A space sin invisible function application B space sin invisible function application C equals

    A plus B plus C equals 27 0 to the power of o end exponent rightwards double arrow A equals B equals C equals 9 0 to the power of o end exponent comma then
    cos invisible function application 2 A plus cos invisible function application 2 B plus cos invisible function application 2 C plus 4 sin invisible function application A sin invisible function application B sin invisible function application C
    equals cos invisible function application 1 8 0 to the power of o end exponent plus cos invisible function application 1 8 0 to the power of o end exponent plus cos invisible function application 1 8 0 to the power of o end exponent plus 4 sin invisible function application 9 0 to the power of o end exponent sin invisible function application 9 0 to the power of o end exponent sin invisible function application 9 0 to the power of o end exponent
    equals negative 1 minus 1 minus 1 plus 4.1.1.1 equals negative 3 plus 4 equals 1.

    If A plus B plus C equals 27 0 to the power of o end exponent comma then cos invisible function application 2 A plus cos invisible function application 2 B plus cos invisible function application 2 C plus 4 space sin invisible function application A space sin invisible function application B space sin invisible function application C equals

    maths-General
    A plus B plus C equals 27 0 to the power of o end exponent rightwards double arrow A equals B equals C equals 9 0 to the power of o end exponent comma then
    cos invisible function application 2 A plus cos invisible function application 2 B plus cos invisible function application 2 C plus 4 sin invisible function application A sin invisible function application B sin invisible function application C
    equals cos invisible function application 1 8 0 to the power of o end exponent plus cos invisible function application 1 8 0 to the power of o end exponent plus cos invisible function application 1 8 0 to the power of o end exponent plus 4 sin invisible function application 9 0 to the power of o end exponent sin invisible function application 9 0 to the power of o end exponent sin invisible function application 9 0 to the power of o end exponent
    equals negative 1 minus 1 minus 1 plus 4.1.1.1 equals negative 3 plus 4 equals 1.
    General
    Maths-

    Which one of the following is not true

    It is a property of matrix multiplication.

    Which one of the following is not true

    Maths-General
    It is a property of matrix multiplication.