PRE-ASSESSMENT GENERAL PHYSICS 1

HOW MANY SIGNIFICANT FIGURES ARE IN 900.001

• 6

• 5

• 4

• 3

HOW MANY SIGNIFICANT FIGURES ARE IN 0.00250

• 5

• 4

• 3

• 2

HOW MANY SIGNIFICANT FIGURES ARE IN 1.25 X 10^3

• 4

• 3

• 2

• 1

HOW MANY SIGNIFICANT FIGURES ARE IN 1.056 X 10^-5

• 1

• 2

• 3

• 4

WHAT IS THE SUM OF 25.0 + 10 USING PROPER SIGNIFICANT FIGURES?

• 40.5

• 35.25

• 35.0

• 40

Answer explanation

To get the approximate value using proper significant figures, you have to round up the value if it is followed by a number greater than or equal to 5.

You may put ~ (pronounced as Tilduh) as a sign of approximation of a value.

ex. 50 + 25.0 = 75.0 -> ~80

But, if the value followed by a leading number is less than or equal to 4, the value is rounded down (rounded off).

Ex. 34 + 10 = 44 -> ~40

What do you call the angle formed when the terminal side of a vector points toward a certain direction?

• Vector Side

• Reference Angle

• Angle of Y-axis

• Displacement angle

Answer explanation

What is the total displacement of a car moving 35 km/h, East and return West with an average velocity of 25 km/h West?

• 60 km/h East

• 60 km/h West

• 10 km/h East

• 10 km/h West

Answer explanation

If a motion is horizontal OR vertical,

the operation to be used to get the total displacement is just addition or subtraction.

If the motion has the same direction, the displacement of both vectors must be added to one another.

ex. 5 m, E + 10 m, E = 15 m, E

However, if the motion requires two different directions, the two vectors must be subtracted to one another.

And, the final direction is dependent to which value has a greater magnitude.

Ex. 5 m, E - 10 m, W = 5 m, W

The direction is pointed towards West because 10 meters is greater than 5 meters.

What is the total mass of 3 metal blocks suspended on a string weighing 5 kg each?

• 20 kg

• 15 kg

• 10 kg

• 5 kg

Answer explanation

The question is all about scalar quantities.

If a physical quantity is considered scalar (ex. mass of an object), you have to compute for their sum.

Which of the following best exemplifies the Quadrant III in the Cartersian plane?

• <-2, +3>

• <+5, -4>

• <+9, +9>

• <-8, -9>

Answer explanation

The Cartesian plane coordinate system has four different Quadrants namely:

Quadrant I where x and y values are positive.

Quadrant II where -x and +y.

Quadrant III where -x and -y are both negative.

Quadrant IV where x is positive, while -y is negative.

How can we get the angle relative to the positive x-axis if the reference angle we get is in Quadrant II?