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Physics 1 Marks Question

Introduction to Physics · Uttarakhand Board (UBSE) STD 12 Science (Uttarakhand - English Medium). 4 questions.

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Question 11 Mark
Express the power of a 100 watt bulb in CGS unit.
Answer
In S.I. unit 100 watt = 100 Joule/sec
In C.G.S. Unit $= 10^9$ erg/sec
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Question 21 Mark
The surface tension of water is 72 dyne/cm. Convert it in SI unit.
Answer
Surface tension of water = 72 dyne/cm
In S.I. Unit, 72 dyne/cm = 0.072N/m
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Question 31 Mark
If all the terms in an equation have same units, is it necessary that they have same dimensions? If all the terms in an equation have same dimensions, is it necessary that they have same units?
Answer
Yes, No $[\omega = 2\pi\text{f}]$$\omega$ has unit rad/ sec but frequency has hertz.
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Question 41 Mark
The normal duration of I.Sc. Physics practical period in Indian colleges is 100 minutes. Express this period in microcenturies. 1 microcentury $= 10^{-6} × 100$ years. How many microcenturies did you sleep yesterday?
Answer
1 micro century $=10^4 \times 100$ years $=10^{-4} \times 365 \times 24 \times 60 \mathrm{~min}$
So, $100\text{ min}=\frac{10^5}{52560}=1.9\text{ microcentury}$
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