Subject :NSO Class : Class 5
Subject :NSO Class : Class 7
Ans 4:
Class : Class 7
The answer should be A because iron is a good conductor of heat it will take away all the heat given to paper and the paper will not burn.
But in case 2 , we see that there is a wooden rod we all know that wood is a good insulator of heat so it will catch fire easily and the paper wrapped on it will burn easily.
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Subject :NSO Class : Class 7
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Subject :NSO Class : Class 8
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Subject :NSO Class : Class 9
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Subject :NSO Class : Class 9
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Subject :NSO Class : Class 4
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Subject :NSO Class : Class 4
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Subject :NSO Class : Class 8
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Subject :NSO Class : Class 9
Ans 1:
Class : Class 9
m=0.3kg here ,f=kx k given 15N/m x, is distance traverse on subjecting f . such that f=kx , so ma=kx , 0.3×a=15N/x ,0.3×a=15N/m×0.2m (x= 20cm) so , a= 10m/s2