EASY
Earn 100

What is the MKS unit of Force ?

Important Questions on Units and Measurements

EASY
The angular speed of a fly-wheel making 180 rpm is ________
MEDIUM
Velocity v and acceleration a in two systems of units 1 and 2 are related as v2=nm2v1 and a2=a1mn respectively. Here m and n are constants. The relations for distance and time in two systems respectively are
EASY
In SI units, kg m2 s-2 is equivalent to which of the following?
EASY

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 m3
(C) Weight (III) m2 kg s-1
(D) Specific volume (IV) kg m2 s-2

The correct match is

EASY

Match List I with List II

  List I   List II
A Torque I kg m1 s2
B Energy density II kg m s1
C Pressure gradient III kg m2 s2
D Impulse IV kg m2 s2

Choose the correct answer from the options given below :

EASY
The distance of the Sun from earth is 1.5×1011 m and its angular diameter is 2000'' when observed from the earth. The diameter of the Sun will be
MEDIUM

A huge circular arc of length 4.4 ly subtends an angle 4s 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=9.46×1015 m

1 AU=1.5×1011 m

EASY
The angle of 1' (minute of arc) in radian is nearly equal to
EASY

If E and H represents the intensity of electric field and magnetizing field respectively, then the unit of EH will be:

EASY
The surface tension of mercury is 32 dyne 32 dyne cm-1. Its value in SI units is
MEDIUM
A new unit of length is chosen such that the speed of light in vacuum is unity. What is the distance between the sun and the earth in terms of this new unit, if light takes 8 min and 20 sec to cover this distance?
MEDIUM
The SI unit of electrochemical equivalent is
MEDIUM
What is the SI system of units? Name two other systems of units.