NCERT Exemplar V — task. Science CBSE, Class 9.

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Answer the following multiple choice questions:

1. 3.42 g of sucrose are dissolved in 18g of water in a beaker. The number of oxygen atoms in the solution are

6.022 × \(10^2{^3}\)
6.09 × \(10^2{^2}\)
6.68 × \(10^2{^3}\)
6.022 × \(10^2{^1}\)

2. A change in the physical state can be brought about

without any energy change
when energy is either given to, or taken out from the system
only when energy is taken out from the system
only when energy is given to the system

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