OAR Mechanical Comprehension Questions with Complete Solutions (Latest 2025) What is a lever? - Correct Answers ✅A simple machine that provides a mechanical advantage in carrying loads.Composed of a fulcrum (or pivot) and rigid rod (or beam).What is the formula for calculating the load or the effort of a lever? - Correct Answers ✅W1 x L1 = W2 x L2 (Weight of the load x distance of the load from the fulcrum = weight of the effort x distance from the fulcrum to the effort.) What is a first class lever? - Correct Answers ✅A lever where the fulcrum is located between the force and the load.ie. seesaw What is a second class lever? - Correct Answers ✅A lever where the load (weight) is located between the force (or effort) and fulcrum. ie. wheelbarrow, bottle opener, nutcracker. Best suited for carrying heavy loads.What is a third class lever? - Correct Answers ✅A lever where the force is located between the load and the fulcrum.ie. chopsticks, tweezers. Used for accuracy rather than weight.What is a gear? - Correct Answers ✅A wheel with equally sized and spaced teeth located on the circumference. 1 / 2
OAR Mechanical Comprehension Questions with Complete Solutions (Latest 2025) What is the first rule of thumb in meshed gears? - Correct Answers ✅Adjacent gears rotate in opposite directions.If a gear system has an even number of cogwheels then...? - Correct Answers ✅The last cogwheel will turn in the direction opposite the first wheel.If a gear system has an odd number of cogwheels then...? - Correct Answers ✅The last cogwheel will turn in the same direction as the first wheel.What is the second rule of thumb in meshed gears? - Correct Answers ✅The velocity of the meshed cogwheels is proportional to the number of teeth. ie. larger the wheel, the slower it turns.What is the equation for calculating the velocity of meshed cogwheels? - Correct Answers ✅N1 x V1 = N2 x V2 (Number of teeth in wheel one x velocity of wheel one = Number of teeth in wheel two x velocity of wheel two) Velocity of meshed gears can also be calculated using what? - Correct Answers ✅Gear Ratio. Gear ration = n1 over/ n2 = v1 over/ v2
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