Jamb 2008 Physics Past Questions And Answers
Convex mirror are used as driving mirrors because images formed are?
- A) erect, virtual and diminished
- B) erect, real and diminished
- C) erect, virtual and magnified
- D) inverted virtual and diminished
During summer, the balance wheel of a clock expands.what effect does this have on the accuracy of the clock?
- A) the clock gians time
- B) the accuracy of the clock is not affected
- C) the clock losses time
- D) the clock stops working
An object placed at the bottom of a well full of clear water appears closer to the surface due to?
- A) diffraction
- B) reflection
- C) refraction
- D) polarization
When cold water is poured on a can containing hot water, the can collapses because the
- A) steam condeses and occupies the partial vacuum in the can
- B) external air pressure counter balances the pressure within the can
- C) steam expands to occupy the vacuum remaining in the can
- D) external pressure becomes greater than the pressure within the can.
The efficiency of the pulley system shown below is 80%. find the effort E required to lift the load of 1200N
- A) 275N
- B) 325N
- C) 375N
- D) 573N
If the partial pressure of water vapour at 27°C is 18 mm Hg and the saturated vapour pressure of the atmosphere at the same temperature is 24 mm Hg, the relative humidity at this temperature is?
- A) 25%
- B) 33%
- C) 75%
- D) 82%
Given the inductor of inductance 5mH, 10mH and 20mH connected in series, the effective inductance is
- A) 0.35mH
- B) 3.50mH
- C) 2.90mH
- D) 35.0mH
Given the progressive wave equation y = 5 sin (2000 πt - 0.4x), calculate wave length
- A) 12.4 m
- B) 15.7 m
- C) 17.5 m
- D) 18.6 m
An electric generator has e.m.f. of 240 V and an internal resistance of 1Ω if the current supplied by the generatoris 20A when the terminal voltage is 220 V, find the ratio of the power supplied to the power dissipated?
- A) 11:1
- B) 1:11
- C) 12:11
- D) 11:12
A sealed flask contains 600cm3 of air at 27°C and is heated to 35°C at constant pressure. The new volume is?
- A) 508cm3
- B) 516cm3
- C) 608cm3
- D) 616cm3