Chapter 1

PHYSICAL QUANTITIES AND MEASUREMENTS

Dimensions of physical quantities

a) Define dimension

b) Determine the dimensions of derived quantities

c) Verify the homogeneity of equations using dimensional analysis

Multiple Choice

Define dimension

• a quantity which can be measured

• quantity which cannot be derived from any physical quantities

• quantity which can be derived

• a method which the physical quantity can be expressed in terms of combination of basics quantities

Multiple Choice

Determine the dimension for the acceleration

• LT^-1

• LT^-2

• LT

• MLT

Multiple Choice

Determine dimension for the Force

• MT^-2

• kgms^-2

• MLT^-2

• ms^-2

Multiple Choice

Define vector quantity

• quantity with direction only

• quantity with both magnitude and direction

• quantity with magnitude only

• quantity that can be measure

Multiple Choice

Calculate the resultant vector of the component along x-direction.

• 7.59N

• 9.00N

• 14.37N

• -14.37N

Multiple Choice

Calculate the resultant vector of the component along y-direction.

• 7.59N

• -16.32N

• 16.32N

• -14.37N

Multiple Choice

Convert 25 cm² into SI unit

• 2500m²

• 0.025m²

• 0.0025m²

• 250m²

Multiple Choice

Convert 45.5 mm³ into SI unit

• 45.5x10^-9 m³

• 45.5x10^-8 m³

• 45.5x10⁹ m³

• 45.5x10⁹ m³

Multiple Choice

Convert 25 cm into SI unit

• 0.25m

• 0.025m

• 25m

• 0.255m