PHYSICS TRIAL QUESTIONS

PHYSICS TRIAL QUESTIONS

Q1. The initial and final speeds of a moving objects are U and V respectively.
If the acceleration of the object is a and the time t motion is t ,  show that of the expression.
V = ut  - at is dimensionally correct.

Q2. A car travels a distance x in time seconds. If the car starts from rest and move with a constant acceleration a, show that expression x = 1/2 at² is dimensionally correct.

Q3. For a uniformly accelerated motion in a straight line. v² = u² + 2as, where v is the final velocity, u is the initial velocity, a is the acceleration and s is the distance covered. Show that u² and 2as are dimensionally equivalent.

Q4. (i) Explain the following terms;
(a) Upper fixed point of thermometer
(b) Lower fixed point of thermometer.

Q4 (ii). List three disadvantages and 3 advantages of alcohol as a thermometric substance.

Q5.(a) Explain why its not advisable to sterilize a clinical thermometer in the boiling water at a normal atmospheric pressure.

Q5. (b) Explain why when the bulb of thermometer is dipped into ice cooled water the mercury level first rises before falling.

Q6. (a) Draw and label a diagram of gold leaf electroscope.

Q6. (b) Explain four uses of gold leaf electroscope.

Q7 (a). What is electric field intensity.

Q7 (b). A charger 1.6 × 10^-6C is placed in a uniform electric field of intensity 2.0 × 10^5NC^-1.
Calculate the magnitude of the electric force exerted on the charge.

Q7 (c). Two parallel plates separated by 15.0mm have a  potential difference of 2.0kV between them.
Calculate the electric field intensity between the plates.

Q8 (a). Explain capacitor and capacitance.

Q8 (b). Explain the statement 'The capacitance of a capacitor is 2UF.

Q8 (c). A 15UF capacitor charged to 250V is connected in parallel with 10UF capacitor charged to 350V.
Calculate the common potential difference.

Q9 (a). State the laws of refraction.

Q9 (b). The angle of minimum deviation when light passes symmetrically through a glass prism is 40; If the refracting angle of the prism is 60,
Calculate the angle of incidence of the light.

Q10 (a) A photon has a frequency of 5.02 × 10^14Hz.
Calculate the energy of the photon in
(i) joules;
(ii) electron volts.

Q10 (b). A spiral spring extends from a length of 10.00cm to 10.01cm when a force of 20N is applied to it.
Calculate the force constant of the spring.