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 27ºC to 127ºC, 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
A body is pulled on a horizontal surface with a rope inclined at 30º to the vertical. If the effective force pulling the body along the horizontal surface is 15N, calculate the tension on the rope.
- A. 30N
- B. 60N
- C. 22.5N
- D. 75N
A particular household utilizes three electrical appliances for six hours daily if the appliances are rated 80W, 100W, and 120W respectively. Calculate the electrical bills paid monthly if an average month is 31 days. [1kwh = #24.08k]
- A. ₦ 2843.22k
- B. ₦ 1950.22k
- C. ₦ 1343.66k
- D. ₦ 46.23k
At a pressure of 10\(^5\)Nm\(^{-2}\), a gas has a volume of 20m\(^3\). Calculate the volume at 4 x 10\(^5\)Nm\(^{-2}\) at constant temperature.
- A. 2m\(^3\)
- B. 3m\(^3\)
- C. 4m\(^3\)
- D. 5m\(^3\)
Calculate the upthrust on a spherical ball of volume 4.2 x 10\(^{-4}\)m\(^{3}\) when totally immersed in a liquid of density 1028kgm\(^{-3}\)
- A. 5.2N
- B. 4.3N
- C. 3.0N
- D. 2.4N
Calculate the magnetic force on an electron in a magnetic field of flux density 10T, with a velocity of 3 x 10\(^7\)m/s at 60º to the magnetic field (e = 1.6 x 10\(^{-19}\)C)
- A. 4.8 x 10\(^{-11}\)N
- B. 4.6 x 10\(^{-12}\)N
- C. 4.16 x 10\(^{-11}\)N
- D. 4.3 x 10\(^{-11}\)N