Physics Past Questions And Answers
A perfect emitter or absorber of radiant energy is a
- A) conductor
- B) black body
- C) white body
- D) red body
At what frequency would a capacitor of 2.5μF used in radio circuit have a resistance of 250Ω
- A. π/800 Hz
- B. 800/π Hz
- C. 200π Hz
- D. 2000π Hz
THe velocity of sound in air at 16oC is 340m/s. What will it be when the pressure is doubled and its temperature raised to 127oC?
- A) 400 m/s
- B) 4,000 m/s
- C) 8,000 m/s
- D) 160,000 m/s
The heat produced in a conductor carrying an electric current is
- A. inversely proportional to the current and the resistance
- B. directly proportional to the current, resistance and the time
- C. inversely proportional to of the resistance, current and the time
- D. directly proportional to the square of the current, the resistance and the time
As a bicycle Tyre was being pumped up, it was noticed that contrary to Boyle's law the volume increased as the pressure increased. The best explanation of this is that Boyle's law is only true for
- A. ideal gases
- B. a fixed mass of gas
- C. a mixture of gases
- D. a gas at variable temperature
Disperson of white light is the ability of white light to
- A. penetrate air, water and glass
- B. move in a straight line
- C. move around corners
- D. separate to its component colours
A vector quantity can only be completely described when ……… and …………are mentioned.
- A. Magnitude and motion
- B. Magnitude and direction
- C. Distance and specified displacement
- D. Moment and momentum
a ray of light which strikes a glass slab from air at normal incidence passes through the slab
- A. undeviated and undisplaced at a lower speed
- B. deviated and undisplaced at a lower speed
- C. deviated and displaced at a lower speed
- D. undeviated and displaced at a faster speed
The net capacitance of the circuit shown below is
- A. 8.0
- B. 6.0
- C. 4.0
- D. 2.0
A body of mass 4 kg resting on a smooth horizontal plane is simultaneously acted upon by two perpendicular forces 6N and 8N. Calculate the acceleration of the motion
- A) 2.5 m/s
- B) 3.0 m/s
- C) 4.0 m/s
- D) 4.5 m/s