⚙️ 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

When light is reflected from a plane mirror at 30°, it will reflect at ______?Answer: 30° The value of ln3 is ______?Answer: 1.0986 If two straight long conductors carry current in the same direction, the magnetic force on each other will be _____?Answer: Attractive Laplace equation is ______ order partial differential equation.Answer: 2nd If the number of turns in coil is doubled and length remains the same, then magnetic flux linked with it ______?Answer: Is doubled The absorption of X-rays in a given material follows _____?Answer: An exponential curve The speed of an object, one second after it has been dropped on the planet, is 8 m/s. What will be it's speed after its speed after 3 seconds when it was first dropped?Answer: 24 m/s A certain gas process ends in its original thermodynamics state. Of the following, which is possible as the net result of the process?Answer: The gas absorbs 50 J of energy as heat and does 50 J of work The instantaneous velocity of a body executing SHM is maximum when the phase of vibration with respect to displacement is _____?Answer: 90° The direction of the induced emf is readily predicted by _____?Answer: Lenz's Law The direction of the induced emf is readily predicted by _____?Answer: Lenz's Law The kinetic energy of an electron in the nth orbit is _____?Answer: 1/2m Vn² An electric generator is a device that transforms ______ energy into electrical energy.Answer: Mechanical One horse power is equal to _____?Answer: 746 watt In printing terminology, which of the following is an accepted term for backing up a sheet in sheet-fed printing?Answer: Work and tumble Which of the following should a microcontroller at-least should consist of?Answer: CPU, RAM, ROM, I/O ports, and timers Object moving along a circular path is?Answer: Not in equilibrium There are three equations of uniformly accelerated motion, the odd one out is?Answer: final velocity = initial_velocity + (2 x acceleration x distance moved) What happens when the stress applied to the body is increased beyond the maximum value and is removed after some time? Young's modulus is defined as ______?Answer: Tensile stress/tensile strain Over-damping results in _____?Answer: Slower return to equilibrium What is the divergence of the vector field f = 3x^2i + 5xyj + xyz^3kA at the point (1, 2, 3)?Answer: 65 Bohr's quantum condition is _____?Answer: mvr = nh/2π A particle is moving in a uniform circular motion with constant speed v along a circle of radius r. The acceleration of the particle is?Answer: V^2/R Business Intelligence (BI) reporting system cannot do which of the following?Answer: Modify data The magnitude of the force of gravity between two identical objects is given by F0. If the mass of each object is doubled but the distance then is halved, then the new force of gravity between the objects will be ______?Answer: 16 F0 If a spherical ball rolls on a table without slipping, the fraction of its total energy associated with rotation is ______?Answer: 2/7 Calculate the number of photons, from green light of mercury (ʎ = 4961 Å), required to do one joule of work?Answer: 2.4961×10^18/m^3 A particle of mass 40 g executes a simple harmonic motion of amplitude 2.0 cm. If the time period is 0.20 s, find the total mechanical energy of the system?Answer: 8.0 × 10^-3 J What will be time period of a spring mass system. If mass m is connected with two springs k1 and k2 in parallel?Answer: T=2π√m/k1+k2 A closed organ pipe is excited to produce the third overtone of the air column. Then it will have ______?Answer: Four nodes and three antinodes.