Physics Past Questions and Answers

The temperature at which the water vapor in the air saturates the air and begins to condense is known as

A Dew point
B Critical point
C Boiling point
D Triple point

Question 1602:

The change of state from solid to liquid occurs

A At constant temperature
B When temperature is lower than the boiling point
C When temperature is just near freezing point
D When temperature is equal to the boiling point

Question 1603:

Which of the following types of thermometers can be used to measure a range of temperature from -50°C to 50°? i. Clinical ii. Mercury iii. Alcohol-in-glass

A I only
B Ii only
C Iii only
D I and ii only

Question 1604:

A body of mass M kg rests on a plane inclined at an angle \(\theta\) to the horizontal. The component of the weight of the body parallel to the plane is

A Mg sin \(\theta\)
B Mg cos \(\theta\)
C Mg tan \(\theta\)
D Mg sec \(\theta\)

Question 1605:

A quantity of water at 20^oC is mixed with another quantity of water at 70^oC. The final steady temperature of the mixture is 40^oC. Determine the ratio of the mass of the cold water to that of the hot water

A 7:2
B 3:2
C 2:5
D 1:2