41. What is the cost of running seven 40 W lamps and five 80 W la mps for 12 hours of the electrical energy cost N7.00kWk?
- A. N80.00
- B. N45.36
- C. N65.00
- D. N57.12
42.
- A. 5.0A
- B. 3.7A
- C. 4.5A
- D. 4.0A
43. Calculate the time taken for a mango fruit that fall from the tree 20 m to the ground [g = 10 ms-2]
- A. 10s
- B. 5s
- C. 4s
- D. 2s
44. Which of the following is not a mechanical wave?
- A. wave in closed pipe
- B. radio waves
- C. water waves
- D. sound waves
45. The velocity ratio of an inclined plane where angle of inclination in θ is
- A. Sinθ
- B. Cosθ
- C. Tanθ
- D.
46. The volume of a fixed mass of gas is 10cm3 when its pressure is 400cmHg. Determine the volume of the gas when its pressure is 200cmHg.
- A. 30cm3
- B. 40cm3
- C. 50cm3
- D. 20cm3
47. Which of the following representations is correct for an atom X with 28 electrons and 30 neutrons?
- A. \(^{58}_{28}X\)
- B. \(^{30}_{28}X\)
- C. \(^{28}_{30}X\)
- D. \(^{58}_{30}X\)
48. Which of the following is true of an electrical charge?
- A. Positive charge means deficit electrons
- B. Negative charge means excess of electrons
- C. electric current means movement of electrons
- D. All of the above
49. A man of mass 50kg ascends a flight of stains 5m high in 5 seconds. If acceleration due to gravity is 10ms−2 the power expended is
- A. 100w
- B. 200w
- C. 400w
- D. 500w
50. Calculate the angle of minimum deviation of a 60o prism of a refractive index [sin-10.75 = 49o]
- A. 38.00o
- B. 19.47o
- C. 16.25o
- D. 49o
