Question

Write true or false. 1.Cubic metre and litre are the units of the same physical quantity. 2.A substance is lighter if it has high density. 3.The equal volumes of two substances can have the same mass. 4.The 1 kg it on contains the same amount of matter as 1 kg of paper. 5.The SI unit of density is g cm-3. 6.The speed of 5 ms-1 is less than the speed of 25km/h.

Answer 1

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Answer:

1.) TRUE ,because both units are of same physical quantity i.e.,

volume.

2.) FALSE ,because for example, oil is lighter than water but has less

density.

3.) TRUE, as if both the substances have same density and volume then obviously their masses will be equal.

4.) FALSE , 1 kg of tin has less amount of matter as it is heavier and i kg of paper has more amount of matter as a sheet of paper is lighter.

5.) TRUE ,because the formula of density is mass/volume so g(S.I unit of mass) and cm3 (S.I. unit of volume) so g/cm3 or gcm-3.

6.) FALSE ,because 25 Km/h = 25000 m/3600 s =250m/36s =  6.94m/s =6.94ms-1 which is lesser than 5ms-1

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Answer 2

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