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Avn lakshmi from Bvbarra, Hyderabad
Subject :NSO    Class : Class 7

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

Column I
(Salts)		 Column II
(Uses)
P. Baking soda (i) In making fire-works
Q. Nitre (ii) As a fungicide
R. Blue vitriol (iii) In purification of
water
S. Phitkari (iv) In fire extinguishers


AP-(iii), Q-(ii), R-(iv), S-(i)
BP-(iv), Q-(iii), R-(i), S-(ii)
CP-(iv), Q-(i), R-(ii), S-(iii)
DP-(ii), Q-(i), R-(iv), S-(iii)


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Avn lakshmi from Bvbarra, Hyderabad
Subject :NSO    Class : Class 7

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Avn lakshmi from Bvbarra, Hyderabad
Subject :NSO    Class : Class 7

Aparna heated a bi-metallic strip made of two different types of metals for some time.

After heating it, she observed that the metallic strip curved as shown in the figure.
Which of the following would best explain the conclusion derived by Aparna about the experiment she had done?

AMetal X is a better conductor of heat than metal Y.
BMetal X is a poorer conductor of heat than metal Y.
CMetal X is of better quality than metal Y.
DMetal X is more flexible than metal Y.


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Devika kanakarajan from sdpy gvhss, Ernakulam
Subject :NSO    Class : Class 9

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ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Subject :NSO    Class : Class 7

Ans 1:

Ivjot Singh Hanspal from Allen Career Institute, Surat
Class : Class 7

Ans 2:

Arun from SOT, chennai
Class : Class 5
Nice

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ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Subject :NSO    Class : Class 7

Oscillations are set in a simple pendulum whose length is 2 m and mass of the bob is 2 kg. Its time period

A Is always constant
B Increases slowly
C Decreases slowly
D First increases then decreases.


th time period of the pendulum is alays constant when th pendulum is working in space and the rope or the thing which holds the pendulum from a rigid point does nt exert any friction on it. But in this question it is not mentioned whether it is in a vacuum with no rigid point or in noral conditions. if it is in normal conditions with atmosphere, thenthe time period will gradually decrease and at some point it will come to a stop , whether it be a any combination of length and weight. So , according to these reasons , i think both a and b are possible as a correct option . So the answer , which is only saying that the pendulum is always constANT is false

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Moksh saksena from NPS, Bangalore
Subject :NSO    Class : Class 8

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Aaditri Samanta from Vidyasagar Shishu Niketan, Midnapore
Subject :NSO    Class : Class 1

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EESHA AGARWAL from Somerville School Noida, Noida
Subject :NSO    Class : Class 9

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Ayoneshu Nag from DONBOSCO PARK CIRCUS, KOLKATA
Subject :NSO    Class : Class 3

Ans 1:

Aarush Joshi from Podar international School, Sangli
Class : Class 4
Option C Potato

Ans 2:

Aviral Gupta from Birla Vidya Niketan, Delhi
Class : Class 3
Option C

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