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Subject :NSO    Class : Class 9

Two fixed point masses of 10 kg and 20 kg are located at (0 m, 0 m) and (5 m, 0 m). Where should a third point mass of 30 kg be kept so that the net force of attraction on 30 kg mass due to point masses 10 kg and 20 kg is zero?

A At 2.05 m from 10 kg mass
B At 2.05 m from 20 kg mass
C At 2.95 m from 10 kg mass
D At 3 m from 20 kg mass


I got stuck at x^2 10x - 25Answer by quadratic equation must be 2.07 but it is 2.05Please help me with this question

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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5
Answer is A

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Subject :NSO    Class : Class 7

Following is a random sequence of steps in the processing of wool. Arrange these steps in the correct sequence and select the correct option.

(i) Scouring (ii) Sorting (iii) Shearing (iv) Removing burrs (v) Dyeing
(vi) Yarn (vii) Spinning (viii) Weaving (ix) Fabric (x) Carding

A (iii) → (i) → (ii) → (iv) → (x) → (v) → (vii) → (vi) → (viii) → (ix)
B (iii) → (ii) → (i) → (iv) → (v) → (x) → (vii) → (vi) → (viii) → (ix)
C (iii) → (ii) → (i) → (iv) → (x) → (v) → (vii) → (vi) → (viii) → (ix)
D (iii) → (i) → (iv) → (ii) → (v) → (x) → (vii) → (vi) → (viii) → (ix)


Answer should be d

Ans 1:

Class : Class 7
Answer should be d

Ans 2:

Class : Class 7
It should be c

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Subject :NSO    Class : Class 7

Consider the following statements (i-iv) and select the option that correctly identifies true (T) and false (F) ones.

(i) Silk is a cellulosic fibre.
(ii) The hair on a sheep’s body is called fleece.
(iii) Silk fabric was first developed in ancient China.
(iv) Cashmere is an extremely soft wool obtained from Cashmere sheep.

(i) (ii) (iii) (iv)
A F F T T
B T T F T
C F T T F
D T T T F


why, i want to know the problem? Answer should be d.

Ans 1:

Class : Class 7
Because cashmere wool is obtained from Cashmere goat and not from Cashmere sheep!

Ans 2:

Class : Class 7
I want to know why cashmere wool is wrong?

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Subject :NSO    Class : Class 4

Analyse the situation shown in the figure and select the correct option.


AWind will blow from P to Q if P is water body.
BWind will blow from Q to P if P is water body.
CWind will blow both sides from P to Q and Q to P if P is water body.
DWind will blow both sides from P to Q and Q to P if Q is water body.


abcdefghijklmnopqrstuvwxyz....................................................................................................................................................................................................................

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4

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Subject :NSO    Class : Class 4

If the given clock is 42 minutes fast, then the correct time after half an hour is __________.



A1 : 05
B11 : 23
C12 : 23
D1 : 23


cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc

Ans 1:

Class : Class 4
Option C.

Ans 2:

Class : Class 4
cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc

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Subject :NSO    Class : Class 9

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Subject :NSO    Class : Class 9

Match column I with column II and choose the correct option from the codes given below.

Column I Column II
P. Hot tea poured in saucer gets cooled faster. (i) Evaporation increases with increase in temperature.
Q. We feel more cold after a hot water bath than a cold water bath. (ii) Evaporation increases with decrease in humidity.
R. Water is cool in earthen pitcher during dry hot day. (iii) Evaporation increases with increase in wind speed.
S. We feel comfortable under a moving fan in summer. (iv) Evaporation increases with increase in surface area.


A P - (ii), Q - (i), R - (iii), S - (iv)
B P - (iii), Q - (iv), R - (ii), S - (i)
C P - (iv), Q - (i), R - (ii), S - (iii)
D P - (iv), Q - (ii), R - (iii), S - (i)


given answer is wrong.

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