Match the physical quantities with their correct SI units. List-I List-II (A) Planck's constant (I) kg m s - 2 (B) Torque (II) kg - 1 m 3 (C) Weight (III) m 2 kg s - 1 (D) Specific volume (IV) kg m 2 s - 2 The correct match is

A = III , B = IV , C = I , D = II

A = II , B = IV , C = I , D = III

A = IV , B = I , C = II , D = III

A = II , B = III , C = I , D = IV

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Which of the following is not a derived physical quantity?

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Important Questions on Physical World and Measurement

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Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

If $E$ and $H$ represents the intensity of electric field and magnetizing field respectively, then the unit of $\frac{E}{H}$ will be:

HARD

Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

A person in front of a mountain is beating a drum at the rate of

40

per minute and hears no distinct echo. If the person moves

90 m

closer to the mountain, he has to beat the drum at

60

per minute to not hear any distinct echo. The speed of sound is

EASY

Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

A spherometer has

20

threads per

cm

. Its circular scale has

100

divisions. The least count of the sphere is

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Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

A student measured the diameter of a small steel ball using a screw gauge of least count

0.001 cm .

The main scale reading is

5 mm

and zero division of the circular scale coincides with

25

divisions above the reference level. If the screw gauge has a zero error of

- 0.004 cm .

the correct diameter of the ball is__________

MEDIUM

Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

The period of oscillation of a simple pendulum is

T = 2 π \sqrt{\frac{l}{g}} .

Measured value of

l

20.0 cm

, known to

1 mm

accuracy and time for

100

oscillations of the pendulum is found to be

90 s

using a wristwatch of

1 s

resolution. The accuracy in the determination of

g

MEDIUM

Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

A huge circular arc of length $4.4 ly$ subtends an angle $4 s$ at the centre of the circle. How long it would take for a body to complete $4$ revolution if its speed is $8 AU$ per second?
Given : $1 ly = 9.46 \times 10^{15} m$

$1 AU = 1.5 \times 10^{11} m$

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Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

The nearest star to our solar system is

4.3

light years away. The distance of this star in Parsec is (Mean distance between the earth and the sun

= 1.5 \times 10^{11} m

and one light year

= 9.46 \times 10^{15} m)

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Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

The angular speed of a fly-wheel making

180 rpm

is ________

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Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

The angle of

1'

(minute of arc) in radian is nearly equal to

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Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

The dimension of light year

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Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

Match the physical quantities with their correct $SI$ units.

	List-I		List-II
(A)	Planck's constant	(I)	$kg m s^{- 2}$
(B)	Torque	(II)	${kg}^{- 1} m^{3}$
(C)	Weight	(III)	$m^{2} kg s^{- 1}$
(D)	Specific volume	(IV)	$kg m^{2} s^{- 2}$

The correct match is

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Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

Match the following?

Column -I		Column -II
(a)	Conductance	(i)	Gray
(b)	Magnetic Induction	(ii)	Lumen
(c)	Absorbed dose	(iii)	Tesla
(d)	Luminous flux	(iv)	Siemens

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Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

The commutator bracket

[X Y, Z]

is expanded as

MEDIUM

Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

Consider a particle moving along the positive direction of

X

-axis. The velocity of the particle is given by

v = α \sqrt{x}

(

α

is a positive constant). At time

t = 0

, if the particle is located at

x = 0

, the time dependence of the velocity and the acceleration of the particle are respectively.

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Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

The unit of potential energy is_____.

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Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

One nautical mile is

6080 ft

. The same in kilometre is

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Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

In two different systems of units, acceleration is represented by the same number while velocity is represented by numbers in the ratio $1 : 3$ . The ratios of unit of length and time are, respectively,

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Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

watt

is,

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Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

The unit of permittivity is

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Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

Assertion: Energy can be divided by volume.

Reason: Dimensions of energy and volume are different.

Which of the following is not a derived physical quantity?

Important Questions on Physical World and Measurement

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