Physics XII - Units and Measurements 01

Question : 1

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Which of the following is not a fundamental unit?

Options:

	mole
	kelvin
	candela
	hertz

Solution :

Hertz is not a fundamental unit.

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Question : 2

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Select odd one out

Options:

	watt-hour
	electron-volt
	BTU
	torr

Solution :

Torr is unit of pressure all other are unit of
energy.

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Question : 3

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One shake is equal to

Options:

	10–3 s
	10–6 s
	10–8 s
	10–10 s

Solution :

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Question : 4

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One X-ray unit is equal to

Options:

	1010 m
	10–10 m
	1013 m
	10–13 m

Solution :

1 X- ra y unit = 10^–13 m

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Question : 5

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Which one of the followings is not a unit of distance?

Options:

	Light year
	parsec
	Astronomical unit
	barn

Solution :

Barn is unit of area.

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Question : 6

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Which of the followings is/are indirect method(s) to measure distance?

Options:

	Parallax method
	Copernicus method
	Kepler’s method
	All of these

Solution :

Parallax method, Copernicus method and
Kepler’s method all are indirect methods
for distance measurement.

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Question : 7

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If n is the numerical value of a physical quantity in a system in which its unit is u then which of the following relations is correct?

Options:

	nu = constant
	None of these

Solution :

Magnitude of a physical quantity is
constant in all systems of unit i.e.,
nu = constant.

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Question : 8

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The value of 1 eV is equal to

Options:

	1.6 × 10–19 V
	1.6 × 10–19 J
	1.6 × 10–19 W
	1.6 × 10–19 C

Solution :

1 eV = 1 × 1.6 × 10^–19 J

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Question : 9

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Which of the following unit is used for measuring nuclear area of cross-section?

Options:

	mm2
	cm2
	curie
	barn

Solution :

Barn is used to measure nuclear crosssectional
area.

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Question : 10

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Which of the following among the four units of pressure is biggest one?

Options:

	pa
	atmosphere
	bar
	torr

Solution :

Atmosphere is biggest unit among pa, bar
and torr.