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The MCQs below are drawn from the Physics subject category.
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231
_____ is the unit given to distances of around 10^-15 m.
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Correct Option
Explanation
Distances on the order of 10^-15 meters are measured in femtometres (also called fermi).
232
One metre has ____ nanometer and one nanometer has ____ meter.
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Correct Option
Explanation
1 metre = 10^9 nanometres and 1 nanometre = 10^-9 metres, so option B is correct.
233
The compressibility of water is 0.4 GPa^-1. Its bulk modulus is
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Correct Option
Explanation
Bulk modulus is the reciprocal of compressibility: K = 1/(0.4 GPa^-1) = 2.5 GPa = 2.5 × 10^9 N/m^2.
234
Which set of prefixes gives values in increasing order?
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Correct Option
Explanation
Pico (10^-12), Micro (10^-6), Mega (10^6), Giga (10^9) is increasing order; the OCR shows a marker next to option B.
235
The order of magnitude of 501 is
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Correct Option
Explanation
501 ≈ 5.01×10², so its order of magnitude is 2.
236
Which is the largest quantity?
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Correct Option
Explanation
0.00047 × 10² cm = 0.047 cm, which is larger than the other given quantities.
237
Pico, kilo and tera mean:
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Correct Option
Explanation
The block's OCR answer hint indicates option C as the correct choice in the scanned material.
238
The order of magnitude of number 0.05 is
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Correct Option
Explanation
0.05 = 5×10⁻², so the order of magnitude is −2.
239
The order of magnitude of 499 is
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Correct Option
Explanation
499 ≈ 4.99×10² so its order of magnitude is 2.
240
Deca, deci and mega, respectively mean:
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Correct Option
Explanation
Deca = 10^1, deci = 10^-1, and mega = 10^6, so option A lists the correct powers of ten.
