Major Quiz #1 - HONOURS
1. A scientific hypothesis may turn out to be right or it may turn out to be wrong. If it is a valid
hypothesis, there must be a test for proving that it is
a.
2.
a.
b.
c.
d.
e.
right.
b.
wrong.
The standard of time is based on:
the daily rotation of the Earth
the frequency of light emitted by Kr86
the yearly revolution of the Earth about the sun
a precision pendulum clock
none of these
3. Which branch of physics deals with heat and temperature?
a. mechanics
b. relativity
c. thermodynamics
d. optics
4.
If some measurements agree closely with each other but differ widely from the actual
value, these measurements are
a.
b.
c.
d.
neither precise nor accurate.
accurate but not precise.
acceptable as a new standard of accuracy.
precise but not accurate.
6. Convert 72 km/h into m/s:
72
𝑘𝑚
103 𝑚
= 72
= 20 𝑚/𝑠
1
ℎ
𝑠
3600
7. (4 x 103 mg)(5 x 104 kg) = 4x103 x 5x 104 (mg)(kg) = 20x107 x(10-3g)(103g) = 20x107 g2
8. Identify the number of significant figures in this number: 0.00908 L
__3__
Complete the following calculations (#9 and #10) and write your answer using correct sig figs.
9. 0.0013g + 32.1g + 0.05g = 32.2 g
10. 5000 m X 10.3 m X 0.0098 m = 5x102 m3
11. 1.53 L – 0.05 L – 0.14 L = 1.34 L
Convert between units for questions #11 - #13
11. 0.005 g = 0.005 x 10-3 kg = 5 x 10 -6 kg
12. 300 mm = 300 x 10-3 m = 300 x 10-3 x 102 cm = 30 cm
13. 0.450 mg = 0.450 x 10-3 g = 0.450 x 10-3 x 109 ng = 0.450 x 106 ng
Solve the following problems. Be sure to show your work and use correct sig figs.
14. 12 m2 = 12 (10-3 km)2 = 12x10-6 km2
15. Convert 10 m/s into km/h
10
𝑚
𝑠
= 10
10−3 𝑘𝑚
1
ℎ
3600
= 36 km/h
17. Supposed A = BC where A has dimensions L / M and C has dimensions L / T.
Find the dimensions of B .
[B] = [T]/[M]
18. 45.2 g ÷ 0.05 s = 9x102 g/s
19.
= 9x 10-2 kg m /s2
20. A lake has an area of 2.3 km2. What is the area of the lake in square meters?
2.3 (103m)2 = 2.3 x 106 m2
HW QUIZ
1. tan 280 = 0.5317 (0.53)
2. a. θ = 840
3. a.
b. θ = 270
c. θ = 350
tan 250 = a/6.2 cm
a = 2.9 cm
c = (2.92 + 6.22) ½ = 6.8 cm
4. Which one of the following expressions may be used to correctly find the angle in the drawing?
a.  = arc cos (5/2) b.  = arc tan (5/2)
c.  = arc sin (5/2) d.  = arc tan (2/5)
e.  = arc sin (2/5)
6. Three sticks are arranged to form a right triangle. If the lengths of the three sticks are 0.47 m, 0.62 m
and 0.78 m, what are the three angles of the triangle?
90°, 53°, and 37°