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Subject :NSO    Class : Class 6

A few mixtures are listed in the box.
(i) Salt solution (ii) Oil and water (iii) Alcohol and water (iv) Soda water (v) Iron and sand (vi) Flour and husk (vii) Milk
Now, read the given passage and fill in the blanks by selecting an appropriate option. Mixtures (p) are homogeneous in nature while mixtures (q) are heterogeneous in nature. Mixture(s) (r) is/are separated into its/their components by centrifugation where (s) component collects towards the centre. Mixture (t) is separated into its components by distillation where the component having (u) boiling point gets collected in the receiver flask first.

P Q R S T U
A i, ii, vi iii, iv, v, vii ii, v Heavier iii Higher
B ii, iv, vi i, iii, v, vii ii, iv Lighter vii Lower
C i, iii, iv ii, v, vi, vii vii Lighter iii Lower
D i, iii, vi ii, iv, v, vii iv, vii Heavier i Higher


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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 3
C

Ans 2:

Class : Class 3
C

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
Option C

Ans 2:

Class : Class 6
the correct option is 'C' BECAUSE SUGAR IS A SOLID SO WHEN THE LIQUID IS HEATED IT EVAPORATES LEAVING THE SUGAR BEHIND

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 7

Ans 2:

Class : Class 6
C is the answer, as in each of these processes, the heat is absorbed.

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5
i think correct answer is C

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Subject :NSO    Class : Class 3

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8
C as the scale is 1:0.05

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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 9

Kepler's third law states that square of period of revolution (T) of a planet around the sun is proportional to third power of average distance r between the sun and the planet i.e. T2 = Kr3 (here K is constant). If the masses of sun and planet are M and m respectively then as per Newton's law of gravitation, force of attraction between them is F = GMm/r2, here G is gravitational constant.
The relation between G and K is described as

A K = G
B K = 1/G
C GK = 4π2
D GMK = 4π2


Ans 1:

Class : Class 9
Correct ans:D. The gravitational force is equal to the centripetal force acting between the Sun and Planet. GMm/r^2=Mv^2/r =>v^2=Gm/r. Also,T=2(pi)r/v. Squaring both the sides we will get

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