Physics Questions and Answers
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
It is observed that water will wet a clean glass because the?
cohesion of water to glass is stronger than the cohesion of water molecules
adhesion of water molecules is weaker than the cohesion of water to glass
cohesion of water to glass is weaker than the cohesion of water molecules
adhesion of water molecules is stronger than the cohesion of water molecules
Correct answer is D
When the adhesion of liquid molecules to the glass is more than the cohesion of the liquid, the liquid will wet glass.
1.15 x 104s
1.15 x 103s
4.6 x 104s
4.6 x 103s
Correct answer is D
Heat supplied = Heat gained
pt = ml
T = \(\frac{ml}{p}\)
= \(\frac{2 \times 2.3 \times 10^6}{1000}\)
= 4.6 x 10\(^3\) sec
room temperature
boiling point
freezing point
standard temperature
Correct answer is B
Liquid boils when its saturated vapor pressure is equal to the (external) atmospheric pressure.
I.e. Boiling point at 100°c
4.28 kg
42.86 kg
1.02 kg
7.14 kg
Correct answer is C
Energy supplied bythe heater = heater gained by water
pt = MCAθ
1000 x 300 = m x 4200(100 - 30)
m = (1000 x 300)/4200 x 70 = 1.02 kg
At 4°c, the volume of a fixed mass of water is?
constant
minimum
maximum
zero
Correct answer is B
Anomalous expansion of water is at temperature ranges 0°c to 4°c u. water contract when heated from 0°c to 4°c. thus the volume of water is least at 4°c