Bumbuli midterm past papers are examination conducted in 2026 to help form four students measure there progressive in their study before NECTA examination.
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5 (a). A mechanical engineer prefers to use long spanner in loosening a tight nut than a short one.
i. State the principle that govern the process.
ii. Explain why engineer choose to do so in 4(a) above.
(b) A piece of metal with the mass of 200g at a temperature of 100⁰C is quickly transferred into a 50g of
water at 20⁰C. Find the final temperature of water.
6. (a) A certain first-class lever of length 2.5 m has a velocity ratio of 12 and an efficiency of 85%.
i. How far from the fulcrum is the effort force applied? (3 Marks)
ii. What effort is required to lift a load weighting 75N?
(b) Exactly explain to why the efficiency of a pulley system is always less than 100%. Give only two
reasons.
7. A car of mass 750 kg is travelling east on a level road. Its engine exerts a constant force of 2.0 kN
causing the car to accelerate at 1.2 ms-2 until it reaches a speed of 25 m/s. Calculate
i.The net force
ii.The force of friction, acting on the car.
iii.If the engine is then turned off, calculate how far the car will travel before coming to rest.
8. (a) Differentiate between boiling and evaporation.
(b) A man standing in front of a vertical cliff fires a gun. He hears he echo after 3s. On moving closer to
the cliff by 82.5m, he fires again and hears the echo after 2.5 s.
Find
i. The distance of the cliff from the initial position of man
ii. The speed of sound in air.
