Physics Past Questions and Answers

Which of the following correctly describes the energy changes in the generation of light by a hydroelectric power station?

A Electrical \(\to\) mechanical \(\to\) potential
B Potential \(\to\)mechanical \(\to\)electrical \(\to\) light
C Mechanical \(\to\) sound \(\to\) electrical \(\to\) light
D Kinetic \(\to\) mechanical \(\to\) electrical \(\to\)light

Question 722:

A plane inclined at angle \(\theta\) has a velocity ratio of 10 : 1. The inclination of the plane to the horizontal is given by

A Tan\(\theta\) = \(\frac{1}{10}\)
B Cot\(\theta\) = \(\frac{1}{10}\)
C Cos\(\theta\) = \(\frac{1}{10}\)
D Sin\(\theta\) = \(\frac{1}{10}\)

Question 723:

A weightless vessel of dimensions 4m x 3m x 2m is filled with a liquid of density 1000kgm^-3 and sealed. What is the maximum pressure this container can exert on a flat surface? [g = 10ms^-2]

A 9 x 10⁴NM^-2
B 4 x 10⁴NM^-2
C 3 x 10⁴NM^-2
D 2 x 10⁴NM^-2

Question 724:

An object of mass 400g and density 600kgm^-3 is suspended with a sting so that half of it is immersed in paraffin of density 900kgm^-3. The tension in the string is

A 1.0N
B 3.0N
C 4.0N
D 5.0N

Question 725:

The thermometric properties of the thermocouple is that is

A E.m.f. changes with temperature
B Resistance changes with temperature
C Volume changes with temperature
D Pressure changes with resistance