⚙️ Mechanical Eng Solved MCQs with Answers

Practice 934 approved ⚙️ Mechanical Eng questions with verified answers from the 🛠️ Engineering Essentials subject for Pakistan exams.

934 solved MCQs

Industrial materials thermal power stations are coated with___?Answer: Epoxy paints The instrument used in a submarine to see the object in the surface of water is:Answer: Periscope Theodolite, a surveying instrument was first invented by?Answer: Leonard Digges The main function of a fish plate is________________?Answer: To join the two rails together Who created the first gasoline Car?Answer: Karl Benz During an isothermal expansion of an ideal gas, which of the following statement is true?Answer: The temperature of the gas remains constant Soundness of cement is tested byAnswer: Le-Chatelier Apparatus The optimal pH of amylase present in saliva is approximately?Answer: 6.8 – 7.0 Bending of light when passing near obstacles is called…………Answer: Diffraction The entropy of a system ………….. for a reversible process.Answer: Remains constant Bernoulli equation is according to ___________ law.Answer: None of these Unit of longitudinal strain is:Answer: No unit (dimensionless) In v=wr, w is called:Answer: Rotational velocity A typical rocket uses 10,000 kgs ₋₃ of fuel and ejects the burnt gases at a speed of:Answer: 2000 m s₋₁ When a rocket is projected at an angle of 300 with initial speed 980 ms-1, the time is:Answer: 100 sec Steel is manufactured by open health process from:Answer: Cast iron Steel is an alloy of iron containing 0.25% to 2.5% of carbon and traces of other metals. It is further classified as:Answer: All of these As the water falls from the tap, the cross sectional area should decrease according to?Answer: Equation of continuity A particle is moving in a straight line with velocity v = (4 - t₂ ) where t us the time from fixed point then acceleration of the particle after 4 sec is:Answer: -4m/sec₂ Which of the following friction is self-adjusting force:Answer: Static A tight wire is clamped at two points 2.0 m apart. It is plucked near one end. Which are three longest wavelengths present on the vibrating wire?Answer: 4.0 m, 2.0 m, 1.33 m A crystal system in which all axes are equal, but none of the angle is 90 degree is:Answer: None of these Steel is manufactured by open hearth process fromAnswer: All of these The volume of a gas at 0 degree C is 100cm₃ , what will be the volume of the same gas at 4560C, assuming that pressure remains constant?Answer: 200cm₃ The reciprocal of Bulk Modulus is called:Answer: Compressibility One gram fats produce nearly ______ calories of energy:Answer: 9000 Which of the following converts’ thermal energy to kinetic energy?Answer: Rocket Output variables are known as:Answer: Dependant variables Tetraethyl lead is used in?Answer: Petrol What is the second name of the Boeing B-9 aircraft?Answer: Death Angel