43
Under which of the following conditions is workdone
- A. A man supports a heavy food above his head with his hands
- B. A boy climbs onto a table
- C. A man pushes unto a table
- D. A woman holds a pot of water
44
Under what conditions are cathode rays produced in a discharge tube?
- A. High pressure and low voltage
- B. High pressure and high voltage
- C. Low pressure and low voltage
- D. Low pressure and high volatge
45
Calculate the upthrust on an object of volume 50cm3 which is immersed in liquid of density \(10^{3}\) kgm-3 [g = 10ms-2]
- A. 0.8N
- B. 2.5N
- C. 0.5N
- D. 1.0N
46
Why do soldiers march disorderly while crossing a bridge?
- A. To prevent resonance on the bridge
- B. To set the bridge into resonance
- C. To make the b ridge collapse
- D. To spread their weight evenly on the bridge
47
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\(^{-1}\)
48
Which of the following is not an electromagnetic radiation?
- A. x - ray
- B. Radio waves
- C. sunlight
- D. sound waves
49
Which is the incorrect formula for a body accelerating uniformly?
- A. a = v2 − \(\frac{u^2}{2}\)
- B. v2 = u2 + 2as
- C. s = ut + \(\frac{1}{2}\) at2
- D. v2 − u2= 2as