Two capacitors of 0.0003ฮผF and 0.0006ฮผF are connected in series, find their combined capacitance.
- A. 0.0009ฮผF
- B. 0.0002ฮผF
- C. 0.0005ฮผF
- D. 0.0001ฮผF
An accumulator is 90% efficient. If it gives out 2700J of energy while discharging, how much energy does it take in?
- A. 3600J
- B. 3000J
- C. 3200J
- D. 2430J
Calculate the value of electric field intensity due to a charge of 4ฮผC if the force due to the charge is 8N
- A. 2.0 x 10\(^6\)NC\(^{-1}\)
- B. 3.0 x 10\(^6\)NC\(^{-1}\)
- C. 4.0 x 10\(^6\)NC\(^{-1}\)
- D. 8.0 x 10\(^6\)NC\(^{-1}\)
What is the colour of red rose under a blue light?
- A. Green
- B. Blue
- C. Yellow
- D. Black
Which of the following measuring instruments operates based on the heating effect of electric current?
- A. moving iron ammeter
- B. hot wire ammeter
- C. galvanometer
- D. electric heater
The efficiency of a cell with internal resistance of 2\(\Omega\) supply current to a 6\(\Omega\) resistor is
- A. 25%
- B. 50%
- C. 65%
- D. 75%
Infra-red thermometers work by detecting the
- A. radiation from the body and converting it to temperature
- B. conduction of heat from the body
- C. convective air pulse from the body
- D. absorption of heat by the body
A force of 10N extends a spring of natural length 1m by 0.02m, calculate the length of the spring when the applied force is 40N.
- A. 0.08m
- B. 0.09m
- C. 1.08m
- D. 1.80m
Bifocal lens is used to correct the eye defect of
- A. astigmatism
- B. hypermatropia
- C. myopia
- D. presbyopia
A monochromatic light is one that
- A. can undergo dispersion
- B. cannot be refracted
- C. has one wavelength
- D. has many wavelength
The simple form of the lead acid accumulator often has a negative pole of
- A. Zinc perioxide
- B. Lead peroxide
- C. Sulphuric acid
- D. lead plate
If the pressure on an enclosed gas is doubled and its temperature rises from 27ยบC to 127ยบC, then its volume will
- A. increase by \(\frac{2}{3^{rd}}\)
- B. increase by \(\frac{1}{3^{rd}}\)
- C. decrease by \(\frac{2}{3^{rd}}\)
- D. decrease by \(\frac{1}{3^{rd}}\)
The force of attraction between molecules of the same substance is
- A. cohesion
- B. capillarity
- C. adhesion
- D. surface tension
Using the diagram above, calculate the relative density of x, if the density of methanol is 800kgm\(^{-3}\)
- A. 0.8
- B. 0.5
- C. 1.5
- D. 2.5
The equivalent capacitance of the capacitors in the circuit above
- A. \(\frac{5}{2}\)C
- B. 4C
- C. \(\frac{3}{2}\)C
- D. 2C
If the displacement of a car is proportional to the square of time, then the car is moving with
- A. Uniform acceleration
- B. Uniform velocity
- C. Increasing acceleration
- D. Decreasing acceleration
A blacksmith heated a metal whose cubic expansivity is 3.9 x 10\(^{-6}\)K\(^{-1}\). Calculate the area expansivity.
- A. 3.9 x 10\(^{-6}\)K\(^{-1}\)
- B. 2.6 x 10\(^{-6}\)K\(^{-1}\).
- C. 1.3 x 10\(^{-6}\)K\(^{-1}\).
- D. 1.6 x 10\(^{-6}\)K\(^{-1}\).
I clear II sharp III poor IV dark
Which of the above happens when the hole of a pinhole camera is diminished?
- A. I only
- B. II only
- C. I and II only
- D. III and IV only
When thermal energy in a solid is increased, the change in state is called
- A. melting
- B. evaporation
- C. freezing
- D. condensation
Newton’s law of cooling is valid only for a
- A. small temperature range
- B. large temperature range
- C. free flow range
- D. presence of heat source