The production and type of charge of a body can only be accounted for by the?
- A. deficiency or surplus of electrons
- B. equibrium in protons and neutrons
- C. deficiency or surplus of protrons
- D. deficiency or surplus of neutrons
A cell of internal resistance r is connected to an external resistor R. The conductor for maximum power transfer is?
- A. R < r
- B. R = r
- C. R = 2r
- D. R > r
A drop of petrol makes a finger colder than a drop of water would because?
- A. petrol takes its latent heat of veporization from the finger
- B. petrol takes its latent heat of fusion from the finger
- C. water is more viscious than petrol
- D. water has higher surface tension dan petrol
what is likely to happen if the glass of a thermometer expands more upon heating than the liquid inside?
- A. the glass will break
- B. the glass will shrink
- C. the liquid will rise up in the stem
- D. the liquid will go down in the stem
The thermos flask is designed to?
- A. prevent heat loss or gain by conduction, convection amd radiation
- B. store hot tea or water
- C. prevent heat gain by conduction, convection and radiation
- D. prevent head lost conduction, convention and radiation
An immersion heater rated 2.0A, 240V is used to boil water from temperature 52°c to 100°c. If the mass of the water is 2.5kg. determine the time taken to boil the water.
[specific heat capacity of water = 4.2 x 103 jkg-1 k-1]
- A. 1.05 x 103s
- B. 1.05 x 105s
- C. 1.05 x 102s
- D. 1.05 x 104s
The thermometric property of a constant volume thermometer is?
- A. change in volume
- B. differential expanssion
- C. change in pressure
- D. change in length
If the relative density of gold is 19.2, the volume of 2.4kg of gold is?
- A. 8.00 x 10-3 m3
- B. 1.25 x 10-4 m3
- C. 1.92 x 10-4 m3
- D. 4.61 x 10-3 m3
At low humidity in an environment, the human skin is usually?
- A. damp and rough
- B. damp and smooth
- C. dry and rough
- D. dry and smooth
A uniform solid cube material 10cm on each side of mass 700g is submerged in water. which of the following best described the behavior of the cube water?
- A. the cube will melt after a period of time
- B. the cube will float
- C. the cube will sink in water
- D. the cube will rest at an equilibrium position in water