امتحان لايف Phy | Exam on Lesson 1

Which of the following measuring devices can measure the shortest length?

………is derived quantity

which of the following is used to measure time

The mass of a cylinder of platinum and Iridium alloy having fixed dimensions kept at 0° Celsius.

The basic physical quantities:

A common feature in the French (Gaussian) system, the British system and the metric system is that they all measure

If the unit of measuring the pressure in the SI system is kg/m s2

1-What are its unit in the French (Gaussian) system ?

If the unit of measuring the pressure in the SI system is kg/m s2

2- What are its unit in the British system ?

A metal sphere of radius r is dropped into a tank of water. As it sinks at speed v, it experiences a drag force F given by F = krv, where k is a constant.

What are the SI base units of k ?

Dimensions of acceleration are …………………

a)LT                         b) LT^-1

c) LT-2                   d) L²T^-1

unit of a physical quantity is kg. /m.s2 its dimensional formula………..
a)MLT                b)ML-1T -2

c)ML^-1T ²           d)MLT²

the dimensional formula of a physical quantity is M⁰ L⁰ T^-1, the measuring unit of this quantity is ……………….

If “power” is the quotient of work and time, so:

The unit of measuring power is ………

a) J/s                              b) N.m/s

c) kg.²/s³                      d) all of them

If “power” is the quotient of work and time, so:

Dimensions of power are………….

a) L²T^-2 

b)  ²L²T^-3

c)  L²T^-3

d)MLT

the force of surface tension=  Work/Area

a)????²????^-1               b)????^-2????????

c) ????????0T-2         d) ????⁰????^-2????

  if pressure = Force/ Area  its dimension

a)????²????^-1                        b)????????-1????-2

c) ????^-1????³T^-2                 d) ????⁰????^-2????

You have a physical quantity (x) of dimensions (M L T – 1) and another physical = quantity (y) of dimensions (LT -1 ). the constant that may join (x & y)

a)????²????^-1                        b)????^-2????????

c) ????^-1????³T^-2                  d) ????0????????0

If x = y z and dimensions of (x) are MLT ^-2 and dimensions of (y)are M⁰LT ^-2, dimensions of (z) are ………………..

a)MLT                      b)ML0T0         c)M⁰LT                   d)M ^-1LT

What are the dimensions of a quantity that is equal to a force multiplied by a distance?

a)????²????²????²                   b)????????2????-2

c)????????²????²                      d)????????????^-2

What are the dimensions of a quantity that is equal to momentum divided by time?

a)????²????²????²                b)????????²????^-2

c)????????²????²                   d)????????????-2

Quantity ????has dimensions of L????^-1.Quantity ???? has dimensions of ML????-2 What are the dimensions of ????×?????

a)????²????²????²                   b)????????2????-3

c)????????²????²                      d)????????????^-2

Consider the four quantities: ????,????,????,and ????,where [????]=????????2????,[????]=????-1????-3 ,and [????]=????2????-1.The compound quantity ????????????????is dimensionless. What are the dimensions of ?????    

a)????²????-1              b)????-2????????

c) ????????                   d) ????⁰????^-2????