Question 1

Which quantity can be converted to the SI system by the conversion factor? $\frac{1000 \mathrm{~m}}{\mathrm{~km}} \frac{1 \mathrm{hr}}{3600 \mathrm{~s}}$ ?

Accepted Answer

A) kilometers per hour 
B) metres per second 
C) miles per hour 
D) kilometres per second 
E) kilometers per minute

Question 2

John and Linda are arguing about the definition of density. John says the density of an object is proportional to its mass. Linda says the object's mass is proportional to its density and to its volume. Which one, if either, is correct?

Accepted Answer

A) They are both wrong. 
B) John is correct, but Linda is wrong. 
C) John is wrong, but Linda is correct. 
D) They are both correct. 
E) They are free to redefine density as they wish.

Question 3

At a recent sporting event, an athlete ran a distance of 100±0.2 m in a time of 9.8±0.1 seconds. What was their speed?

Accepted Answer

A) 10.20±0.2 m/s 
B) 10.20±0.3 m/s 
C) 10.20±0.01 m/s 
D) 10.20±0.12 m/s 
E) 10.20±0.05 m/s

Question 4

The standard kilogram is a platinum-iridium cylinder 39 mm in height and 39 mm in diameter. What is the density of the material?

Accepted Answer

The answer of The standard kilogram is a platinum-iridium cylinder...

Question 5

The basic function of a carburettor of an automobile is to atomise the petrol and mix it with air to promote rapid combustion. As an example, assume that 30 cm3 of petrol is atomised into N spherical droplets, each with a radius of 2.0 *10-5 m. What is the total surface area of these N spherical droplets?

Accepted Answer

The answer of The basic function of a carburettor of...

Question 6

If each frame of a motion picture film is 35 cm high, and 24 frames go by in a second, estimate how many frames are needed to show a two-hour-long movie.

Accepted Answer

A) 1400 
B) 25 000 
C) 50 000 
D) 170 000 
E) This cannot be determined without knowing how many reels were used.

Question 7

One mole of the carbon-12 isotope contains 6.022 *1023 atoms. What volume in m3 would be needed to store one mole of cube-shaped children's blocks 2.00 cm long on each side?

Accepted Answer

A) 4.8 * 1018 
B) 1.2 *1022 
C) 6.0 * 1023 
D) 1.2 * 1024 
E) 4.8 *1024

Exam 1: Physics and Measurement

Which quantity can be converted to the SI system by the conversion factor? 1000 m km1hr3600 s\frac{1000 \mathrm{~m}}{\mathrm{~km}} \frac{1 \mathrm{hr}}{3600 \mathrm{~s}} km1000 m​3600 s1hr​ ?