Study resources on Kenyaplex

Get ready-made curriculum aligned revision materials

Exam papers, notes, holiday assignments and topical questions – all aligned to the Kenyan curriculum.

Browse exam papers

Or go directly to:

Class notes Holiday assignments Topical questions Other resources

Explain why it is not advisable to use a 10A fuse for a hair dryer rated 2.5Kw, 240V.

Explain why it is not advisable to use a 10A fuse for a hair drier rated 2.5Kw, 240V.

Answers

Not suitable,fuse used must be slightly higher than 10.41A.

sharon kalunda answered the question on May 30, 2019 at 11:10

Answer Attachments

Next: Explain why the cathode of a CRO is coated with oxides of metals such as Barium and Strontium.

Previous: A person standing behind a wall hears a bell ringing although he cannot see the bell. What property of sound enables him to hear the sound?

View more Physics Questions and Answers | Return to Questions Index

Exams With Marking Schemes

Related Questions

Explain why the cathode of a CRO is coated with oxides of metals such as Barium and Strontium. (Solved)

Explain why the cathode of a CRO is coated with oxides of metals such as Barium and Strontium.

Date posted: May 30, 2019 . Answers (1)
A box of mass 500g has dimension 10m × 5m × 3m. Determine the maximum pressure exerted by the box on a flat surface. (Take... (Solved)

A box of mass 500g has dimension 10m × 5m × 3m. Determine the maximum pressure exerted by the box on a flat surface. (Take g = 10N/kg)

Date posted: May 30, 2019 . Answers (1)
The figure below represents a hydraulic brake. A force of 20N is applied on the foot pedal connected to a piston of area 0.0005m² and this... (Solved)

The figure below represents a hydraulic brake.

A force of 20N is applied on the foot pedal connected to a piston of area 0.0005m² and this causes a stopping force of 5000N. Calculate
i) The pressure in the master cylinder.
ii) The area of the slave piston.
iii) The velocity ratio

Date posted: May 30, 2019 . Answers (1)
A block of glass of mass 0.25kg floats in mercury of density 1.36 × 10⁴kg/m³. What volume of the glass lies under the surface of... (Solved)

A block of glass of mass 0.25kg floats in mercury of density 1.36 × 10⁴kg/m³. What volume of the glass lies under the surface of mercury?

Date posted: May 30, 2019 . Answers (1)
A rectangular block of cross-sectional area 0.08m² is immersed in a liquid of density 1200kg/m³. The top and the lower surfaces are 80cm and 200cm below... (Solved)

A rectangular block of cross-sectional area 0.08m² is immersed in a liquid of density 1200kg/m³. The top and the lower
surfaces are 80cm and 200cm below the surface of the liquid respectively.
i) What is the downward force on the top of the block?
ii) Calculate the upthrust on the block.

Date posted: May 30, 2019 . Answers (1)
Explain why it is necessary to add a little flour to the water when boiling it to cook ugali. (Solved)

Explain why it is necessary to add a little flour to the water when boiling it to cook ugali.

Date posted: May 30, 2019 . Answers (1)
A uniform rod of length 4m and mass of 4kg is pivoted at 3.6m mark. The rod is held horizontal with a vertical rope at... (Solved)

A uniform rod of length 4m and mass of 4kg is pivoted at 3.6m mark. The rod is held horizontal with a vertical rope at the 4m
mark, as shown in the figure 3.0 below.

Calculate the tension, T in the rope (Take g = 10N/kg)

Date posted: May 30, 2019 . Answers (1)
A Spring extends by 0.7cm when a mass of 420g is hang on it on earth. By what length would the spring extend if the... (Solved)

A Spring extends by 0.7cm when a mass of 420g is hang on it on earth. By what length would the spring extend if the same
set up was taken to the moon where the gravitational intensity is one-sixth of that one earth.Take gravitational field intensity on surface of Earth g, 10N/kg.

Date posted: May 30, 2019 . Answers (1)
The figure below shows a plane mirror and the word PHYSICS written on its front. On the same diagram, write down the appearance of the word... (Solved)

The figure below shows a plane mirror and the word PHYSICS written on its front.

On the same diagram, write down the appearance of the word after reflection on the mirror.

Date posted: May 30, 2019 . Answers (1)
Sketch the graph of density of water against temperature upto 10^oC. (Solved)

Sketch the graph of density of water against temperature upto 10^oC.

Date posted: May 30, 2019 . Answers (1)
State one similarity between “moment of force about a point” and “work done” (Solved)

State one similarity between “moment of force about a point” and “work done”

Date posted: May 30, 2019 . Answers (1)
The figure below shows a burette containing a liquid up to the level marked on the figure. 20 drops of the liquid are now run... (Solved)

The figure below shows a burette containing a liquid up to the level marked on the figure. 20 drops of the liquid are now run out of the burette. If each drop has a volume of 1.1ml. Mark on the figure the new level of the liquid in the burette.

Date posted: May 30, 2019 . Answers (1)
The figure below shows a circuit diagram for a photocell.i) Explain why the milliammeter shows a deflection when ultraviolet light is shone on the photocell.ii)... (Solved)

The figure below shows a circuit diagram for a photocell.

i) Explain why the milliammeter shows a deflection when ultraviolet light is shone on the photocell.
ii) Explain how the milliammeter reading is affected when the intensity of UV light is increased.

Date posted: May 29, 2019 . Answers (1)
The figure below shows four capacitors connected to a battery of 12 volts. Calculate : i) effective capacitance. ii) charge on the capacitor of 3.2 iii) p.d across the... (Solved)

The figure below shows four capacitors connected to a battery of 12 volts.

Calculate :
i) effective capacitance.
ii) charge on the capacitor of 3.2
iii) p.d across the capacitor of 5
iv) the energy stored by the capacitor of 2

Date posted: May 29, 2019 . Answers (1)
A student while investigating the focal length of a certain concave mirror, measured object and image distances and drew a graph of 1/u against 1/v shown... (Solved)

A student while investigating the focal length of a certain concave mirror, measured object and image distances
and drew a graph of 1/u against 1/v shown below.

From the graph, determine the focal length.

Date posted: May 29, 2019 . Answers (1)
What is meant by the term “topping” as applied to a lead acid accumulator ? (Solved)

What is meant by the term “topping” as applied to a lead acid accumulator ?

Date posted: May 29, 2019 . Answers (1)
The figure below shows a ray of light XY striking the mirror CD held at an angle of 108⁰ to mirror DE.Complete the path of... (Solved)

The figure below shows a ray of light XY striking the mirror CD held at an angle of 108⁰ to mirror DE.

Complete the path of the ray XY and state the final angle of reflection.

Date posted: May 29, 2019 . Answers (1)
The maximum wavelength of light required to cause photoelectric emission on a metal surface is 8.0×10^-7. The metal surface is irradiated with light of freque4ncy... (Solved)

The maximum wavelength of light required to cause photoelectric emission on a metal surface is 8.0×10^-7. The metal surface is irradiated with light of freque4ncy 8.5 × 10¹⁴ Hz. Determine
i) The threshold frequency.
ii) The work function of the metal in electron volts.
iii) The maximum kinetic energy of the electron.
iv The maximum velocity of the emitted electrons.
(Take 1ev = 1.6×10^-19J, C=3.0×10⁸m/s, h=6.63×10^-34Js and mass of electron = 9.11 × 10^-31kg)

Date posted: May 27, 2019 . Answers (1)
The diagram below shows a magnetic material being magnetised. Sketch a graph of magnetic strength against number of strokes for the material being magnetised on the... (Solved)

The diagram below shows a magnetic material being magnetised.

Sketch a graph of magnetic strength against number of strokes for the material being magnetised on the grid below.

Date posted: May 27, 2019 . Answers (1)
Calculate the angle of refraction for a ray of light incident to an air-glass interface, making an angle of a 50° with the interface. (Solved)

Calculate the angle of refraction for a ray of light incident to an air-glass interface, making an angle of a 50° with the interface.

Date posted: May 27, 2019 . Answers (1)