20cm
45cm
54cm
63cm
70cm
Correct answer is A
\(\frac{\text{image height}}{\text{object height}}\) = \(\frac{\text{image distance}}{\text{object distance}}\)
\(\frac{10}{15}\) = \(\frac{\text{image distance}}{30}\)
image distance = 20cm
39.5J/kgoC
50.4J/kgoC
127.6J/kgoC
154.6J/kgoC
173.4J/kgoC
Correct answer is C
Heat lost = heat gained
0.25 x C1 x (170 - 12) = 0.1 x 4200 x (12 - 0)
C1 = 127.6J/kgoC
Which of the following statements is NOT true? Thermostats are used to control the temperature of
pressure cookers
laundry irons
hot water storage tanks
aquaria for tropical fish
heated apartments
Correct answer is A
No explanation has been provided for this answer.
pipette
burette
measuring cylinder
density
bottle
Correct answer is E
No explanation has been provided for this answer.
Which of the following machines does NOT apply the lever principle?
claw hammer
wheel barrow
single moving pulley
sugartongs
nutcrackers
Correct answer is C
No explanation has been provided for this answer.