Science Dimensions Engineering

Give the definition of derived quantities

• Derived quantities are used to express magnitude to be neater, simple and easy to read.

• Derived quantities are physical quantities that cannot be defined in term of other physical quantities.

• Derived quantities are physical quantities derived from combination of base quantities through multiplication or division or both.
  
  

• Derived quantities are a letter placed at the beginning of a word to modify its meaning.

• All the answer is wrong

Define vector quantity and provide TWO (2) examples.

• Vector quantities are quantity which has magnitude only. E.g displacement & force

• Vector quantities are quantity which has both magnitude and direction. E.g distance & volume

• Vector quantities are quantity which has magnitude only. E.g distance & volume

• Vector quantities are quantity which has both magnitude and direction. E.g displacement & force

Convert the following unit

180 𝑘𝑚/ℎ to 𝑚/𝑠

• 75 𝑚/𝑠

• 110 𝑚/𝑠

• 100 𝑚/𝑠

• 120 𝑚/𝑠

• All the answer wrong

This question two correct answers

A wooden stick is 35 inches long. How long is the stick in cm and m

• 420 cm

• 88.9 cm

• 4.2 m

• 0.889 m

• 2.91 cm

Define the deceleration and state the SI Unit:

• Deceleration is the speed of an object in a specified direction or the rate of change of volume. SI unit: $\frac{m}{s^2}$

Figure: Velocity (𝑣) – time (𝑡) graph. 'B' is

• Deceleration velocity

• Deceleration

• Acceleration

• Constant Velocity

Tags

NGSS.MS-PS3-1

Starting from rest, a sprinter reaches his top velocity in 3𝑠. He runs a distance of 24𝑚 in 3𝑠. What is his acceleration? (Assume his acceleration is uniform)

• a = 4.3 $\frac{m}{s^{-2}}$

• a = 6.3 $\frac{m}{s^{-2}}$

• a = 5.0 $\frac{m}{s^{-2}}$

Tags

NGSS.MS-PS2-2

Newton's First Law states that..

• voltage drop across a device is directly proportional to the current passing through it.

• the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

• a fluid at rest in a closed container, a pressure change in one part is transmitted without loss to every portion of the fluid and to the walls of the container.

• object will remain at rest or in uniform motion in a straight line unless acted upon by an external force.

This question has more than one answer.
A 100𝑁 force is required to accelerate a box at 15 ms-2 What is the mass of the box?

• 7.609 kg

• 6.67 kg

• 7609 g

• 6670 g

• All the answers are wrong

Tags

NGSS.MS-PS2-2

A motorcycle of mass 150𝑘𝑔 accelerates from 10𝑚𝑠−1 to 100𝑚𝑠−1 in 20𝑠. What is the accelerating force developed by the motorcycle engine?

• 675 Nm

• 675 ms-1

• 675 N

• 675 nM

Tags

NGSS.MS-PS2-2