ECAT - University of Engineering and Technology (UET) Lahore 2017 Past Paper with Answers

Practice the ECAT - University of Engineering and Technology (UET) Lahore 2017 past paper with 60 solved MCQs, answers and topic coverage.

60 solved MCQs across 1 approved paper

Young’s double slit experiment is used to study interference of:Answer: Visible light The following device does not use electromagnetic waves for its operation:Answer: Ultra-sound machine AC voltage is fed into a single diode rectifier. The output of the rectifier is:Answer: Half wave rectified DC voltage As the water falls from the tap, the cross sectional area should decrease according to?Answer: Equation of continuity You have 20 inductors available each of 15 H. you need an inductor of 1 H in a circuit. You achieve it by combination?Answer: 15 inductors in parallel A thermistor with negative temperature co-efficient is placed in a furnace. When temperature of furnace increases the resistance:Answer: Decreases In frequency modulation, the amplitude of carrier waves remain same but its frequency changes proportion to:Answer: The amplitude of modulating signals Reception of particular radio station is selected by tuning knob which changes the?Answer: Capacitance Density of oxygen is about 16 times that of hydrogen. Therefore if speed of hydrogen is x, then speed of oxygen?Answer: Less than x When you drop a ball it accelerates at 9.8m/sec₂. If you instead throw it downward then it accelerates immediately after leaving your hand assuming no air resistance:Answer: 9.8 In an inelastic collision between two bodies, following is conserved?Answer: Momentum AC voltage is passed through single diode rectifier, the output of the rectifier is:Answer: Half wave DC A Police motor cycle running at 140 km/hr sounds a siren of 2 Hz frequency while shasing a car at 150 Km/hr. The apparent frequency heard by the car driver is:Answer: Greater than 2 Hz If two NOT gates in parallel are attached to NAND gate in series, the gate formed is:Answer: OR A transformer has 100 turns on the input side and 500 t6urns on the output side. If rms value of input voltage and current is 220V and 5A respectively. The output power is:Answer: 1100 Watt A truck of mass 5000 Kg and a car of mass 1000 Kg are both travelling at a speed of 36 Km/hr. Assume the force required to stop the truck in 10 sec is X newton and the force required to stop the car in 10 sec is Y newton. The difference X and Y is equal to?Answer: 4 KN A tight wire is clamped at two points 2 m apart. It is plucked near one end, what are the three longest wavelengths produced on the vibrating wire:Answer: 4 m, 2 m, 1.33 m Consider two spheres A and B of radii ra and rb both concentric with point charge Q. if ra>rb then the total flux passing normally through the sphere A and B is related as?Answer: Flux through both spheres is equal A 500 kg rocket travels in deep space at a constant speed of 3000 m sec -1. The power being produced by the rocket engine at this time is:Answer: None of these In an inelastic collision between two bodies, the following is conserved:Answer: Momentum only You have 10 resistors available, each of 20 KW. You need to form a 2.5 KW resistor for your circuit using the available resistors. You can connect:Answer: Eight 20 kΩ in parallel You have 15 capacitors available with you, each of 15 nF. You need a capacitance for around 150 nF in a circuit.Answer: 10 capacitors in parallel A 1000 kg truck carrying a load of 500 kg travels on a mountain for 5 minutes at constant spee Its power output is 2500 watts. Assuming g = 10 m/sec2, it will achieve a vertical height of:Answer: 75 m When a metal surface is exposed in light, in may emit electron. The maximum energy of these electrons depends on:Answer: Wavelength of light According to Heisenberg’s uncertainty principle, for any given particle is not possible to accurately measure:Answer: Both position and momentum Asim is now three times as old as Irfan. After 10 years, Asim will be twice as old as Irfan. Asim’s at this time is:Answer: 30 A box contains 15 red, 10 green and 5 yellows toffees. Asim picks 2 green toffees and 1 red toffee out of the box and eats them. What is the probability that Irfan will now pick a green toffee to eat?Answer: 8/22 If the set 𝑺 = {−𝟏, 𝟎, 𝟏}:Answer: S is closed with respect to multiplication What is the empirical formula of glucose:Answer: CH₂O Base principle of crystallization is:Answer: Solute should be soluble in a suitable amount of solvent at high temperature and excess amount of solute is thrown out as crystals when it is cooled