Physics Past Questions and Answers

On a particular hot day, the temperature is 40°C and the partial pressure of water vapor in the air is 38.8 mmHg. What is the relative humidity?

A 70
B 62
C 80
D 42

Question 37:

Calculate the absolute pressure at the bottom of a lake at a depth of 32.8 m. Assume the density of the water is 1 x 10^3 kgm-3 and the air above is at a pressure of 101.3 kPa.

[Take g = 9.8 ms-2]

A 422.7
B 220.14
C 464.53
D 321.74

Question 38:

The terminals of a battery of emf 24.0 V and internal resistance of 1.0 Ω is connected to an external resistor 5.0 Ω. Find the terminal p.d.

A 18.0V
B 12.0V
C 16.0V
D 20.0V

Question 39:

A lorry accelerates uniformly in a straight line with acceleration of \(4ms^-2\) and covers a distance of 250 m in a time interval of 10 s. How far will it travel in the next 10 s?

A 650
B 900
C 800
D 250

Question 40:

The half life of a radioactive material is 12 days. Calculate the decay constant.

A 0.8663 \(day^{-1}\)
B 0.04331 \(day^{-1}\)
C 0.17325 \(day^{-1}\)
D 0.05775 \(day^{-1}\)