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

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எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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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

$\pm$

$+$

$Thickness = i i (i i i)$

Substitute the values in the formula,

Thickness of the ball :

$cm$

$1$

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15. Numerical Problems - I

Exercise condition: