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

EASY

Earn 100

Which of the following is not a derived physical quantity?

50% studentsanswered this correctly

Important Questions on Units and Measurements

EASY

Physics>Mechanics>Units and Measurements>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>Mechanics>Units and Measurements>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>Mechanics>Units and Measurements>Physical Quantities

A spherometer has

20

threads per

cm

. Its circular scale has

100

divisions. The least count of the sphere is

EASY

Physics>Mechanics>Units and Measurements>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>Mechanics>Units and Measurements>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>Mechanics>Units and Measurements>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 : $1 ly = 9.46 \times 10^{15} m$

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

EASY

Physics>Mechanics>Units and Measurements>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)

EASY

Physics>Mechanics>Units and Measurements>Physical Quantities

The angular speed of a fly-wheel making

180 rpm

is ________

EASY

Physics>Mechanics>Units and Measurements>Physical Quantities

The angle of

1'

(minute of arc) in radian is nearly equal to

EASY

Physics>Mechanics>Units and Measurements>Physical Quantities

The dimension of light year

EASY

Physics>Mechanics>Units and Measurements>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)	$kg m^{2} s^{- 2}$