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

Velocity v and acceleration a in two systems of units 1 and 2 are related as v 2 = n m 2 v 1 and a 2 = a 1 m n respectively. Here m and n are constants. The relations for distance and time in two systems respectively are

n 3 m 3 L 1 = L 2 and n 2 m T 1 = T 2

L 1 = n 4 m 2 L 2 and T 1 = n 2 m T 2

L 1 = n 2 m L 2 and T 1 = n 4 m 2 T 2

n 2 m L 1 = L 2 and n 4 m 2 T 1 = T 2

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The solid angle subtended by a spherical section of an area $3 {cm}^{2}$ at the centre of curvature situated symmetrically at a distance of $7 cm$ from the area is nearly equal to

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Important Questions on Units and Measurements

EASY

Physics>Mechanics>Units and Measurements>The International System of Units

The dimension of light year

EASY

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Plane angle and solid angle have:

MEDIUM

Physics>Mechanics>Units and Measurements>The International System of Units

The angular diameter of a planet measured from earth is

90 " .

If the diameter of the planet is

π \times 10^{6} m,

then its distance from the earth is

EASY

Physics>Mechanics>Units and Measurements>The International System of Units

A spherometer has

20

threads per

cm

. Its circular scale has

100

divisions. The least count of the sphere is

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

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Physics>Mechanics>Units and Measurements>The International System of Units

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)

MEDIUM

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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

EASY

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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__________

EASY

Physics>Mechanics>Units and Measurements>The International System of Units

The angular speed of a fly-wheel making

180 rpm

is ________

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Physics>Mechanics>Units and Measurements>The International System of Units

Light year is a unit of

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Physics>Mechanics>Units and Measurements>The International System of Units

An accurate measurement implies that

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Physics>Mechanics>Units and Measurements>The International System of Units

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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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 : $1 ly = 9.46 \times 10^{15} m$

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

HARD

Physics>Mechanics>Units and Measurements>The International System of Units

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

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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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Pick out the stranger

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Physics>Mechanics>Units and Measurements>The International System of Units

Velocity

(v)

and acceleration

(a)

in two systems of units

1

and

2

are related as

v_{2} = \frac{n}{m^{2}} v_{1}

and

a_{2} = \frac{a_{1}}{m n}

respectively. Here

m

and

n

are constants. The relations for distance and time in two systems respectively are

EASY

Physics>Mechanics>Units and Measurements>The International System of Units

The distance of the Sun from earth is

1.5 \times 10^{11} m

and its angular diameter is

2000''

when observed from the earth. The diameter of the Sun will be

EASY

Physics>Mechanics>Units and Measurements>The International System of Units

The prefix atto means

EASY

Physics>Mechanics>Units and Measurements>The International System of Units

The angle of

1'

(minute of arc) in radian is nearly equal to

The solid angle subtended by a spherical section of an area 3cm2 at the centre of curvature situated symmetrically at a distance of 7cm from the area is nearly equal to

Important Questions on Units and Measurements

Learn and Prepare for any exam you want !

The solid angle subtended by a spherical section of an area $3 {cm}^{2}$ at the centre of curvature situated symmetrically at a distance of $7 cm$ from the area is nearly equal to