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    General
    General
    Easy

    Question

    For which of the following motions gravity is not responsible?

    1. An apple falling from the tree
    2. The motion of a merry-go-round
    3. The Moon revolving around the Earth
    4. The planets revolving around the Sun

    hintHint:

    A rotating object doesn't always require gravity.

    The correct answer is: The motion of a merry-go-round

      Here, the correct option will be 'b' i.e; the motion of a merry-go-round. In this case, the gravitational force is not responsible for the movement. While in all the other cases gravitational force is involved, for example- the planets moving around sun,moon revolving around earth and apple falling from a tree.

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      The velocity-time graph of a uniformly decelerating motion is a ____.

      The velocity-time graph of a uniformly decelerating motion is a ____.

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      Sepia is also known as

      Sepia is also known as

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      The sum of 730 + 450 using front – end estimation is______. 

      Front-end estimation means rounding off a number to the nearest place value of the leading digit of the number.

      The sum of 730 + 450 using front – end estimation is______. 

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      Front-end estimation means rounding off a number to the nearest place value of the leading digit of the number.

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      Round the number 5432 to the nearest hundred.

      For rounding off to the nearest hundred, we can also look at the number formed by the tens place digit and one place digit. If the number formed is less than 50,we round down and if the number is 50 or more we round up.

      Round the number 5432 to the nearest hundred.

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      For rounding off to the nearest hundred, we can also look at the number formed by the tens place digit and one place digit. If the number formed is less than 50,we round down and if the number is 50 or more we round up.

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      Estimate 275 + 238 to nearest hundred.

      Estimate 275 + 238 to nearest hundred.

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      What is the value of 20/100?

      What is the value of 20/100?

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      Biology











      Identify structures A to D –











      Identify structures A to D –

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      botany-

      An ellipse slides between two perpendicular straight lines x equals 0 blank a n d blank Y equals 0 then, locus of its foci is

      An ellipse slides between two perpendicular straight lines x equals 0 blank a n d blank Y equals 0 then, locus of its foci is

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      If there are exactly two points on the ellipse fraction numerator x to the power of 2 end exponent over denominator a to the power of 2 end exponent end fraction plus fraction numerator y to the power of 2 end exponent over denominator b to the power of 2 end exponent end fraction equals 1 whose distance from its centre is same and is equal to square root of fraction numerator a to the power of 2 end exponent plus 2 b to the power of 2 end exponent over denominator 2 end fraction end root then eccentricity of the ellipse is

      If there are exactly two points on the ellipse fraction numerator x to the power of 2 end exponent over denominator a to the power of 2 end exponent end fraction plus fraction numerator y to the power of 2 end exponent over denominator b to the power of 2 end exponent end fraction equals 1 whose distance from its centre is same and is equal to square root of fraction numerator a to the power of 2 end exponent plus 2 b to the power of 2 end exponent over denominator 2 end fraction end root then eccentricity of the ellipse is

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      Tangent at any point of ellipse 9 x to the power of 2 end exponent plus 16 y to the power of 2 end exponent minus 144 equals 0 is drawn. Eccentric
      angle of ‘ P’ is theta equals fraction numerator 1 over denominator 2 end fraction s i n to the power of negative 1 end exponent invisible function application open parentheses fraction numerator 1 over denominator 7 end fraction close parentheses If is the foot of perpendicular from centre blank ´ O blank ´ to this tangent then angle P O N is

      Tangent at any point of ellipse 9 x to the power of 2 end exponent plus 16 y to the power of 2 end exponent minus 144 equals 0 is drawn. Eccentric
      angle of ‘ P’ is theta equals fraction numerator 1 over denominator 2 end fraction s i n to the power of negative 1 end exponent invisible function application open parentheses fraction numerator 1 over denominator 7 end fraction close parentheses If is the foot of perpendicular from centre blank ´ O blank ´ to this tangent then angle P O N is

      botany-General
      General
      botany-

      If the curve x to the power of 2 end exponent plus 3 y to the power of 2 end exponent equals 9 subtends as obtuse angle at the point left parenthesis 2 alpha comma alpha right parenthesis left parenthesis left parenthesis alpha element of text  int  end text text eger end text text end text right parenthesis,blank left parenthesis alpha element of text  int eger  end text right parenthesis then a possible value of is

      If the curve x to the power of 2 end exponent plus 3 y to the power of 2 end exponent equals 9 subtends as obtuse angle at the point left parenthesis 2 alpha comma alpha right parenthesis left parenthesis left parenthesis alpha element of text  int  end text text eger end text text end text right parenthesis,blank left parenthesis alpha element of text  int eger  end text right parenthesis then a possible value of is

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      General
      botany-

      Let Q equals left parenthesis 3 comma square root of 5 right parenthesis comma R equals left parenthesis 7 , 3 square root of 5 right parenthesis . A point P in the XY-plane varies in such a way that perimeter of capital delta P Q R is 16. Then the maximum area of capital delta P Q R is

      Let Q equals left parenthesis 3 comma square root of 5 right parenthesis comma R equals left parenthesis 7 , 3 square root of 5 right parenthesis . A point P in the XY-plane varies in such a way that perimeter of capital delta P Q R is 16. Then the maximum area of capital delta P Q R is

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      P comma Q blank are points on the ellipse fraction numerator x to the power of 2 end exponent over denominator 25 end fraction plus fraction numerator y to the power of 2 end exponent over denominator 16 end fraction equals 1 such that P Q is a chord through the point R left parenthesis 3 , 0 right parenthesis text  .  end text If vertical line P R vertical line equals 2 then length of chord P Q is

      P comma Q blank are points on the ellipse fraction numerator x to the power of 2 end exponent over denominator 25 end fraction plus fraction numerator y to the power of 2 end exponent over denominator 16 end fraction equals 1 such that P Q is a chord through the point R left parenthesis 3 , 0 right parenthesis text  .  end text If vertical line P R vertical line equals 2 then length of chord P Q is

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      botany-

      If f left parenthesis x right parenthesis is a decreasing function for all x element of R and f left parenthesis x right parenthesis greater than 0 for all x element of R then the range of K so that the equation fraction numerator x to the power of 2 end exponent over denominator f open parentheses K to the power of 2 end exponent plus 2 K plus 5 close parentheses end fraction plus fraction numerator y to the power of 2 end exponent over denominator f left parenthesis K plus 11 right parenthesis end fraction equals 1 represents an ellipse whose major axis is the X-axis is

      If f left parenthesis x right parenthesis is a decreasing function for all x element of R and f left parenthesis x right parenthesis greater than 0 for all x element of R then the range of K so that the equation fraction numerator x to the power of 2 end exponent over denominator f open parentheses K to the power of 2 end exponent plus 2 K plus 5 close parentheses end fraction plus fraction numerator y to the power of 2 end exponent over denominator f left parenthesis K plus 11 right parenthesis end fraction equals 1 represents an ellipse whose major axis is the X-axis is

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      General
      botany-

      From the focus left parenthesis negative 5 , 0 right parenthesis of the ellipse fraction numerator x to the power of 2 end exponent over denominator 45 end fraction plus fraction numerator y to the power of 2 end exponent over denominator 20 end fraction equals 1 a ray of light is sent which makes angle c o s to the power of negative 1 end exponent invisible function application open parentheses fraction numerator negative 1 over denominator square root of 5 end fraction close parentheses with the positive direction of X-axis upon reacting the ellipse the ray is reflected from it. Slope of the reflected ray is

      From the focus left parenthesis negative 5 , 0 right parenthesis of the ellipse fraction numerator x to the power of 2 end exponent over denominator 45 end fraction plus fraction numerator y to the power of 2 end exponent over denominator 20 end fraction equals 1 a ray of light is sent which makes angle c o s to the power of negative 1 end exponent invisible function application open parentheses fraction numerator negative 1 over denominator square root of 5 end fraction close parentheses with the positive direction of X-axis upon reacting the ellipse the ray is reflected from it. Slope of the reflected ray is

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