- A micrometer screw gauge with zero error of -0.01mm is used to determine the diameter of a marble whose diameter is 2.32mm.
(Solved)
A micrometer screw gauge with zero error of -0.01mm is used to determine the diameter of a marble whose diameter is 2.32mm.
(i) State the reading taken when the cylinder is grasped by the jaws
(ii) In the space below, sketch the scale that gives the reading in (a) above if it has a pitch
Date posted: April 3, 2019.
- A micrometer screw gauge has a negative zero error of 0.06mm. Show on a micrometer screw gauge, including the essential parts only a reading of...(Solved)
A micrometer screw gauge has a negative zero error of 0.06mm. Show on a micrometer screw gauge, including the essential parts only a reading of 5.99mm
Date posted: April 3, 2019.
- The vernier calipers shown below have a zero error of -0.06 cm(Solved)
The vernier calipers shown below have a zero error of -0.06 cm
State the actual reading on the instrument.
Date posted: April 3, 2019.
- a) The data below was obtained in an experiment to estimate the diameter of an oil molecule:-(Solved)
(a)The data below was obtained in an experiment to estimate the diameter of an oil molecule:-
- Level of oil in burette= 26cm3
- Level of oil in burettes after adding 50drops of oil=25.2cm3
- Diameter of oil patch= 7cm
(i) Determine the volume of one drop of oil
(ii) Calculate the thickness of a molecule
(iii) State any two assumptions made in this experiment
(iv) In the experiment 14.(a) lycopodium powder is used on the water surface. What is the role
of the lycopodium powder?
(b) A molecule of a liquid occupies a space about 1.5 x 10-9-9m in
thickness and breadth. Calculate the number of molecules in a litre of the liquid
Date posted: April 3, 2019.
- Lycopodium powder is lightly sprinkled on a clean water surface in a large tray. A red hot needle is plunged at the centre of the...(Solved)
Lycopodium powder is lightly sprinkled on a clean water surface in a large tray. A red hot needle is plunged at the centre of the water surface. State and explain the observation
Date posted: April 3, 2019.
- Water in a dam falls through a height 24.5m. If we assume that there are no energy losses,calculate the new temperature of the water as...(Solved)
Water in a dam falls through a height 24.5m. If we assume that there are no energy losses,calculate the new temperature of the water as it strikes the lower end, given that its initial temperature at the top of the dam is 18.9°C.Take specific heat capacity of water = 4200J/kg
Date posted: April 3, 2019.
- The springs A, B, C and D are identical and each extends by 2cm, when a force of 6N is suspended on the system. Determine...(Solved)
The springs A, B, C and D are identical and each extends by 2cm, when a force of 6N is suspended on the system. Determine the extension of the system
Date posted: April 3, 2019.
- The figure below represents a bimetallic strip of metals X and Y at room temperature.(Solved)
The figure below represents a bimetallic strip of metals X and Y at room temperature.
The figure below shows its shape when dipped into crushed ice
Sketch a diagram in the space given below to show the shape when the strip is heated to a
temperature above the room temperature
Date posted: April 3, 2019.
- The figure below shows a bimetallic strip made of brass and iron. A marble is placed at end A of the bimetallic strip as shown below:-(Solved)
The figure below shows a bimetallic strip made of brass and iron. A marble is placed at end A of the bimetallic strip as shown below:-
State and explain what will be observed when the bimetallic strip is strongly cooled.
Date posted: April 3, 2019.
- What do you understand by the statement ‘lower fixed point’ on a temperature scale?(Solved)
What do you understand by the statement ‘lower fixed point’ on a temperature scale?
Date posted: April 3, 2019.
- State two liquids which are used in thermometer(Solved)
State two liquids which are used in thermometer.
Date posted: April 3, 2019.
- Figure shows a beam balance made out of concrete and reinforced with steel.(Solved)
Figure shows a beam balance made out of concrete and reinforced with steel.
Use a diagram to explain the behaviour of the shape of the beam when heated up.
Date posted: April 3, 2019.
- Give a reason why gases are more compressible than liquids(Solved)
Give a reason why gases are more compressible than liquids
Date posted: April 3, 2019.
- An oil drop of average diameter 0.7mm spreads out into a circular patch of diameter 75cm on the surface of water in a trough
(i) Calculate...(Solved)
An oil drop of average diameter 0.7mm spreads out into a circular patch of diameter 75cm on the surface of water in a trough
(i) Calculate the average thickness of a molecule of oil
(ii) State two assumptions made in (i) above
Date posted: April 3, 2019.
- In terms of kinetic theory of matter, explain why evaporation causes cooling(Solved)
In terms of kinetic theory of matter, explain why evaporation causes cooling
Date posted: April 3, 2019.
- The diagram figure below shows a glass tube containing enclosed air by a thread of mercury 50mm
long when the tube is held in a horizontal...(Solved)
The diagram figure below shows a glass tube containing enclosed air by a thread of mercury 50mm
long when the tube is held in a horizontal position.
(i) The tube is slowly raised in a vertical position with the open end facing up. Determine
the new length of the trapped air (tube has same area of cross-section; atmospheric pressure = 750mmHg)
(ii) Account for the difference in the column of trapped air using kinetic theory of matter assuming that temperature is constant.
Date posted: April 3, 2019.
- Explain how an excited hydrogen atom is able to emit radiation of different wavelengths. (Solved)
Explain how an excited hydrogen atom is able to emit radiation of different wavelengths.
Date posted: April 3, 2019.
- A partially filled balloon is placed in a bell jar with its open end on a thick glass plate
as shown in figure. The contact between...(Solved)
A partially filled balloon is placed in a bell jar with its open end on a thick glass plate
as shown in figure. The contact between the jar and the glass plate is greased to make it air tight:
State and explain what happens to the balloon when air in the ball jar is slowly evacuated.
Date posted: April 2, 2019.
- What is the experimental evidence that shows that molecules in gases and liquids are in a state of motion(Solved)
What is the experimental evidence that shows that molecules in gases and liquids are in a state of motion
Date posted: April 2, 2019.
- You are provided with a long glass-tube, fitting corks, cotton wool, concentrated solution hydrochloric acid and concentrated ammonia solution.(Solved)
You are provided with a long glass-tube, fitting corks, cotton wool, concentrated solution hydrochloric acid and concentrated ammonia solution.
(i) Draw a possible set-up to compare the rates of diffusion of ammonia gas and hydrochloric acid gas
(ii) Outline a clear procedure on how the experiment can be carried out.
(iii) What are the possible observations and conclusion
Date posted: April 2, 2019.
- Draw the cross-section of a basic solar heating panel that uses heat from the sun to warm
water which flows through pipes(Solved)
Draw the cross-section of a basic solar heating panel that uses heat from the sun to warm
water which flows through pipes
Date posted: April 2, 2019.
- Distinguish between natural and forced convection currents.(Solved)
Distinguish between natural and forced convection currents.
Date posted: April 2, 2019.
- The total weight of a car with passengers is 25,000N. The area of contact of each of the four
tyres with the ground is 0.025m2. Determine...(Solved)
The total weight of a car with passengers is 25,000N. The area of contact of each of the four
tyres with the ground is 0.025m2. Determine the minimum car tyre pressure
Date posted: April 2, 2019.
- A block measuring 20cm x 10cm by 5cm rests on a flat surface. The block has a weight of 3N.
Determine the maximum pressure it exerts...(Solved)
A block measuring 20cm x 10cm by 5cm rests on a flat surface. The block has a weight of 3N.
Determine the maximum pressure it exerts on the surface.
Date posted: April 2, 2019.
- The figure shows a liquid in a pail.(Solved)
The figure shows a liquid in a pail.
Suggest a reason why pail manufacturers prefer the shape shown to other shapes
Date posted: April 2, 2019.
- Calculate the pressure of the gas supply.(Solved)
Calculate the pressure of the gas supply.
Date posted: April 2, 2019.
- Two immiscible liquids are poured in a container to the levels shown in the diagram below.(Solved)
Two immiscible liquids are poured in a container to the levels shown in the diagram below.
If the densities of the liquids A and B are 1g/cm3 and 0.8g/cm3 respectively, find the pressure
acting upon solid C at the bottom of the container due to the liquids
Date posted: April 2, 2019.
- A helical spring extends by 1 cm when a force of 1.5N is applied to it. Find the elastic potential
energy stored in it.(Solved)
A helical spring extends by 1 cm when a force of 1.5N is applied to it. Find the elastic potential
energy stored in it.
Date posted: April 2, 2019.
- Figure below shows a measuring cylinder of height 30cm filled to a height of 20cm with water and the rest occupied by kerosene.(Solved)
Figure below shows a measuring cylinder of height 30cm filled to a height of 20cm with water and the rest occupied by kerosene.
Given that density of water = 1000Kgm-3, density of kerosene = 800Kgm-3 and atmospheric pressure = 1.03x105 pascals, determine the pressure acting on the base of the container.
Date posted: April 2, 2019.
- The barometric height at sea level is 76cm of mercury while at a point on a highland it is 74cm of mercury. What is the...(Solved)
The barometric height at sea level is 76cm of mercury while at a point on a highland it is 74cm of mercury. What is the altitude of the point? (Take g = 10m/s2 , density of mercury =
13600kg/m3 and density of air as 1.25kg/m3)
Date posted: April 2, 2019.