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Radioactivity Questions And Answers (part 2)

Radioactivity Questions 1.  (a) Define radioactive decay  (b) A radioactive element decays to 1/128 of its original activity after 49 days. Determine its half –life

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X-ray Questions And Answers (part 2)

X-ray Questions   1.  Give one use of X –rays in medicine   2.  State the factor that affects:-  (i) The intensity of X-rays  (ii)

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ELECTRICITY & Electronics Questions And Answers

ELECTRICITY & Electronics Questions 1.  State one advantage of a lead-acid accumulator over a dry cell   2.  State one defect of a simple cell

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Photoelectric effect Questions And Answers (part 2)

Photoelectric effect Questions 1.  (a) Define the following:   (i) Photoelectric effect   (ii) threshold wavelength   (b) The variation of frequency f with the

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Floating and sinking Questions And Answers (part 2)

Floating and sinking Questions 1.  Define thermionic emission 2.  (a) State:- (i) Archimedes’s principle (ii) The law of floatation (b) The solid of mass 12kg,

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Work, energy and power Questions And Answers (part 2)

 Work, energy and power Questions 1.  Given that a lamp is rated 45W 240V. Calculate the resistance of the heating element.   2.  An electric

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Waves II Questions And Answers (part 2)

Waves II Questions 1.   (a) (i) Distinguish between stationary and progressive waves     (ii) State a reason why a closed tube or pipe

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Quality of heat Questions And Answers (part 2)

Quality of heat Questions 1.  500g of a metal is heated to 100oC and then placed in a 200g mass of water at 15oC. If

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Thin lenses Questions And Answers (part 2)

Thin lenses Questions 1.  The figure below shows how rays from a distant and near objects are focused inside a human eye with a certain

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Sound II Questions And Answers (part 2)

Sound II Questions 1.  The human ear can distinguish two sounds as separate only if they need it at least 0.1 seconds apart. How far

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Refraction of light Questions And Answers (part 2)

Refraction of light Questions 1.  The refractive index of paraffin is 1.47 and that of glass is 1.55. Determine the critical angle of a ray

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Resistors Questions And Answers (part 2)

Resistors Questions 1.  Your are provided with the following apparatus: connecting wires, an ammeter, fixed resistors, a voltmeter, a variance resistor, a switch and two

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Machines & inclined planes Questions And Answers (part 2)

Machines & inclined planes Questions 1.  (a) Distinguish energy from work   (b) A lady uses a ramp to lift 1500N load though a vertical

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Linear motion Questions And Answers (part 2)

Linear motion Questions 1.  A footballer kicks a ball of mass 0.6kg initially at rest using a force of 720N. If the foot was in

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Reflection at curved surfaces and spherical surfaces Questions And Answers (part 2)

Reflection at curved surfaces and spherical surfaces Questions 1.  (a) The table below shows the object distance u and the corresponding image distance v of

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Magnetsim Questions And Answers (part 2)

Magnetsim Questions 1.  (a Two pins are attached to each of the magnets as shown below.   (i) (ii)      Explain the behaviour of