Numerical Problems - I — task. Science State Board, Class 9.

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1. Inian and Ezhilan argue about the light year. Inian tells that it is \(9.46 \times 10^{15}\ m\) and Ezhilan argues that it is \(9.46 \times 10^{12}\ m\). Who is right?

Justify your answer.

Answer:

The magnitude of light year \(=\)

\(9.46 \times 10^{15}\ m\)
\(9.46 \times 10^{12}\ m\)
\(9.46 \times 10^{5}\ m\)
\(9.46 \times 10^{11}\ m\)

So, gave a correct answer.

2. The main scale reading while measuring the thickness of a rubber ball using Vernier Caliper is 7 \(cm\) and the Vernier scale coincidence is 6. Find the radius of the ball.

Solution:

From the data given,

Main scale reading (\(MSR\)) \(=\) 7 \(cm\)

Vernier scale coincidence (\(VSC\)) \(=\) 6

Let us consider,

Least count (\(LC\)) \(=\) \(cm\)

The formula to calculate the thickness of the ball,

Answer variants:

\(\times\)

\(-\)

VSC

MSR