Physics Past Questions And Answers
State three observable phenomena where a particle behaves like waves. State the scientific principle underlying the operation of fibre optics.
(b) Explain each of the following terms as used in fibre optics: (i) core; (ii) cladding
(a) Define Young modulus of elasticity;
(b) A spiral spring extends from a length of 10.0 cm to 10.01 cm when a force of 20 N is applied on it. Calculate the force constant of the spring.
The pressure P, volume V, and absolute temperature T of a given mass of an ideal gas change simultaneously. Which of the followng equations is correct about the gas?
- A. PV = \(\frac{constant}{T}\)
- B. \(\frac{P}{T} = Constant\)
- C. \(\frac{P}{V} = \frac{constant}{T}\)
- D. \(\frac{I}{T} = \frac{constant}{PV}\)
Calculate the electric field intensity between two plates of potential difference 6.5V when separated by a distance of 35cm.
- A. 18.57NC−1
- B. 53.06N C−1
- C. 2.28NC−1
- D. 0.80NC−1
What type of wave is emitted by a loud speaker?
- A. Transverse
- B. Longitudinal
- C. Gamma
- D. Radio
The earpiece of a telephone handset converts energy from
- A. electrical to sound
- B. sound to electrical
- C. sound to electrical
- D. sound to radio wave
A cannon is fired from town X,after how long is the sound heard at a town Y 4.95 km away?
[velocity of sound in the air = 330 m/s]
- A) 30 s
- B) 10 s
- C) 10 s
- D) 15 s
Which of the following waves is not transverse
- A. light waves
- B. sound waves
- C. sea waves
- D. radio waves
When a ship sails from salt water into fresh water, the fraction of its volume above the water surface will
- A. increase
- B. decrease
- C. remain the same
- D. increase then decrease
(a) Define the capacitance of a capacitor.
(b) State three factors on which the capacitance of a parallel plate capacitor depends.
(c) Derive a formula for the energy W stored in a charged capacitor of capacitance C carrying a charge Q on either plate.
(d) Two capacitors of capacitance 4\(\mu F\) and 6\(\mu F\) are connected in series to a 100V d.c supply. Draw the circuit diagram and calculate the (i) charge on either plate of each capacitor (ii) p.d. across each capacitor; (iii) energy of the combined capacitors.
