Physics Past Questions And Answers
When an atom loses or gain a charge it becomes
- A. An electron
- B. An ion
- C. A neutron
- D. A proton
An object moves in a circular path of radius 0.5m with a speed of 1ms−1. What is its angular velocity?
- A. 8rads−1
- B. 4rads−1
- C. 1rads−1
- D. 2rads−1
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The above report the graph electron energy against the frequency of the radiation incident on a metal surface. lnterprete the;
(i) slope of the graph;
(ii) intercept, OC;
(iii) intercept, OK.
View Discussion (0)WAEC 2001 THEORYWhich of the following statements is NOT correct?
- A. Molecules of a liquid are stationary
- B. Brownian motion is an evidence of particle nature of matter
- C. Matter is made up of molecules
- D. The molecules of matter are in constant motion
The relationship between the directions of magnetic field, the current-carrying wire in the field is easily remembered using
- A. Octet rule
- B. Right hand grip rule
- C. Maxwell
- D. Fleming
Which of the following factors affect the rate of evaporation of a liquid? i. Exposed surface area ii Temperature of the surroundings iii. Thermal capacity of the liquid iv. Relative humidity of the surroundings
- A. ii and iii only
- B. ii, iii and iv only
- C. i, iii and iv only
- D. i, ii and iv only
In the fig below, A lever of length 200m is used to lift a load of mass 180kg. The pivot at P is 20m from the load. what minimum force F must be applied at the end of the lever [g = 10ms-2]
- A. 9N
- B. 18N
- C. 20N
- D. 200N
Which of the following statements is a disadvantage of human power? It
- A. controls other sources of farm power
- B. brings about least damage
- C. is easily available and controlled
- D. has low output.
A heating coil rated at 100W is used to boil off 0.5kg of boiling water. The time taken to boil off the water is [specific latent heat of vaporization of water = 2.3 x 106Jkg-1]
- A. 1.15 x 109 s
- B. 1.15 x 107 s
- C. 1.15 x 105 s
- D. 1.15 x 104 s
(a) Distinguish between heat and temperature.
(b) State two physical properties of substances which may be used to measure temperature.
(c) State two reasons why mercury is preferred to alcohol as a thermometric liquid.
(d)(i) Describe how a mercury-in-glass thermometer is calibrated.
(ii) State two precautions necessary to ensure an accurate result.
(e) Explain how land and sea breezes occur.
View Discussion (0)WAEC 1998 THEORY