Description : Calculate the convection current when electron density of 200 units is travelling at a speed of 12m/s. a) 16.67 b) 2400 c) 2880 d) 0.0
Last Answer : b) 2400
Description : An electron is travelling at right angles to a uniform magnetic field of flux density 1.2 mT with a speed of 8 × 106 m s-1, the radius of circular path followed by electron is A. 3.8 cm B. 3.7 cm C. 3.6 cm D. 3.5 cm
Last Answer : 3.8 cm
Description : The velocity of a wave travelling in the air medium without transmission lines or waveguides(wireless) is a) 6 x 10 8 b) 3 x 10 8 c) 1.5 x 10 8 d) 9 x 10 8
Last Answer : b) 3 x 10 8
Description : A train travelling at 36 kmph completely crosses another train having half its length and travelling in the opposite direction at 54 kmph, in 12 seconds. If it also passes a railway platform in 112 minutes, the length ... is : a) 560 metres b) 620 metres c) 700 meres d) 750 metres e) 720 meters
Last Answer : Answer: c)
Description : The magnetic field intensity of an infinite sheet of charge with charge density 36.5 units in air will be a) 18.25 b) 11.25 c) 73 d) 1/36.5
Last Answer : a) 18.25
Description : . Find the current when the charge is a time function given by q(t) = 3t + t 2 at 2 seconds. a) 3 b) 5 c) 7 d) 9
Last Answer : c) 7
Description : A car travelling at a speed of 60 km/hour is braked and comes to rest 6 seconds after the brakes are applied. The minimum coefficient of driction between the wheels and the road would be a.0.107 b.0.3 c.0.283 d.0.417 e.0.5
Last Answer : c. 0.283
Description : Calculate the energy stored per unit volume in a dielectric medium due to polarisation when P = 9 units and E = 8 units. a) 1.77 b) 2.25 c) 36 d) 144
Last Answer : c) 36
Description : Calculate the frequency at which the conduction and displacement currents become equal with unity conductivity in a material of permittivity 2. a) 18 GHz b) 9 GHz c) 36 GHz d) 24 GHz
Last Answer : b) 9 GHz
Description : Find the electric field intensity of two charges 2C and -1C separated by a distance 1m in air. a) 18 X 10 9 b) 9 X 10 9 c) 36 X 10 9 d) -18 X 10 9
Last Answer : b) 9 X 10 9
Description : When the electric field travels in +x direction and the EM wave is travelling the –y direction, then the magnetic field will be travelling in which direction? a) +z direction b) –z direction c) Either +z or –z direction d) Does not trave
Last Answer : c) Either +z or –z direction
Description : Find the mobility of the electrons when the drift velocity is 23 units and the electric field is 11 units. a) 1.1 b) 2.2 c) 3.2 d) 0.9
Last Answer : b) 2.2
Description : A boy sitting in a train which is travelling at 25 km/hr observes that a goods train travelling in opposite direction, takes 4.5 seconds to pass him. If the train is 140 m long, find its speed. A) 77km/hr B) 79km/hr C) 87km/hr D) 89km/hr
Last Answer : ANSWER : C Explanation: Relative speed = distance / time = (140 / 4.5) m/s = 31.11 m/s Convert m/s into km/hr 31.11 m/s = (31.11 * 18 / 50 km/hr = (560 / 5) km/hr = ... train (by sitting) = (112 - 25) km/hr = 87 km/hr Therefore the speed of goods train is 87 km/hr.
Description : If a train crosses a tree in 24 seconds while travelling at a speed of 90km/hr, then in how much time will the train cross a telegraph post of length 1200m at same speed? A) 26 sec B) 48 sec C) 72 sec D) 38 sec
Last Answer : ANSWER:C Explanation: Speed of the train = 90 km/hr Converting the speed into m/sec 90 km/hr = (90* 5/18)m/s = 25m/s length of the train = distance travelled we know distance = speed * ... Time = distance / speed = ( 1800/25) sec = 72 seconds Hence the required answer is 72 seconds
Description : Which of the following properties distinguish a material as conductor, insulator and semiconductor? a) Free electron charges b) Fermi level after doping c) Energy band gap d) Electron density
Last Answer : c) Energy band gap
Description : When the rotational path of the magnetic field intensity is zero, then the current in the path will be a) 1 b) 0 c) ∞ d) 0.5
Last Answer : b) 0
Description : An electric field is given as E = 6y 2 z i + 12xyz j + 6xy 2 k. An incremental path is given by dl = -3 i + 5 j – 2 k mm. The work done in moving a 2mC charge along the path if the location of the path is at p(0,2,5) is (in Joule) a) 0.64 b) 0.72 c) 0.78 d) 0.80
Last Answer : b) 0.72
Description : Calculate the electric field when the conductivity is 20 units, electron density is 2.4 units and the velocity is 10m/s. Assume the conduction and convection current densities are same. a) 2.4 b) 4.8 c) 3.6 d) 1.2
Last Answer : d) 1.2
Description : Find the electron density when convection current density is 120 units and the velocity is 5m/s. a) 12 b) 600 c) 24 d) 720
Last Answer : c) 24
Description : If D = 2xy i + 3yz j + 4xz k, how much flux passes through x = 3 plane for which - 1
Description : Ganesh is travelling on his motorbike and has calculated to reach golden temple at 8 p.m if he travels at 30 km/hr; he will reach there at 6 p.m if he travels at 45 km/hr. At what speed must he travel to reach the golden temple at 7 p.m? a) 36 b) 46 c) 32 d) 30
Last Answer : A Let the distance travelled be x km x/30 – x/45 = 2 (3x – 2x) / 90 = 2 x/90 = 2 x = 180km Time taken to travel 180 km at 30 km/hr = 180 / 30 = 6 hrs So ganesh started 6 hrs before 8 pm That is 2 pm Required speed = distance / time =(180/5) =36 km/hr
Description : Calculate the emf in a material with flux linkage of 3.5t 2 at 2 seconds. a) 3.5 b) -7 c) -14 d) 28
Last Answer : c) -14
Description : Find the power of an inductor of 5H and current 4.5A after 2 seconds. a) 25.31 b) 50.62 c) 102.4 d) 204.8
Last Answer : a) 25.31
Description : Find the displacement current when the flux density is given by t 3 at 2 seconds. a) 3 b) 6 c) 12 d) 27
Last Answer : c) 12
Description : Calculate the attenuation constant of a conductor of conductivity 200 units, frequency 1M radian/s in air. a) 11.2 b) 1.12 c) 56.23 d) 5.62
Last Answer : a) 11.2
Description : Calculate the velocity of a wave with frequency 2 x10 9 rad/s and phase constant of 4 x 10 8 units. a) 0.5 b) 5 c) 0.2 d) 2
Last Answer : b) 5
Description : The resultant electric field of two components in the x and y direction having amplitudes 6 and 8 respectively is a) 100 b) 36 c) 64 d) 10
Last Answer : d) 10
Description : Find the Lorentz force due to a conductor of length 2m carrying a current of 1.5A and magnetic flux density of 12 units. a) 24 b) 36 c) 32 d) 45
Last Answer : c) 32
Description : Calculate the Larmer angular frequency for a magnetic flux density of 12.34 x 10 -10 . a) 108.36 b) 810.63 c) 368.81 d) 183.36
Last Answer : a) 108.36
Description : Find the magnitude of the displacement current density in air at a frequency of 18GHz in frequency domain. Take electric field E as 4 units. a) 18 b) 72 c) 36 d) 4
Last Answer : d) 4
Description : Calculate the energy in an electric field with flux density 6 units and field intensity of 4 units. a) 12 b) 24 c) 36 d) 48
Last Answer : a) 12
Description : Find the work done moving a charge 2C having potential V = 24volts is a) 96 b) 24 c) 36 d) 48
Last Answer : d) 48
Description : A infinite resistance is considered as a/an a) Closed path(short circuit) b) Open path c) Not defined d) Ammeter with zero reading
Last Answer : b) Open path
Description : When curl of a path is zero, the field is said to be conservative. State True/False. a) True b) False
Last Answer : a) True
Description : A field in which a test charge around any closed surface in static path is zero is called a) Solenoidal b) Rotational c) Irrotational d) Conservativ
Last Answer : d) Conservative
Description : The total permittivity of a dielectric transformer oil (relative permittivity is 2.2) will be (in order 10 -11 ) a) 1.94 b) 19.4 c) 0.194 d) 194
Last Answer : a) 1.94
Description : In a braking test, a vehicle travelling at 36 km ph was stopped at a braking distance of 8.0 m. The average value of the vehicle's skid resistance (friction coefficient) is (A) 0.64 (B) 6.25 (C) 0.16 (D) None of these
Last Answer : Answer: Option C
Description : A wheel accelerates from rest with an acceleration of 6 rad/sec2. How many revolutions are experienced in 4 seconds? a.12.36 b.25.6 c.9.82 d.107 dynes e.7.64
Last Answer : e. 7.64
Description : On Ashok marg, three consecutive traffic lights change after 36, 42 and 72 seconds respectively. If the lights are switched on at 9.00 A.M sharp, at what time will they change simultaneously? a) 9 :08 :44 b) 9:08:24 c) 9:08:04 d) 9:08:34
Last Answer : b) 9:08:24
Description : An aeroplane of 110,000kg has its CG at 22.6m aft of the datum. The CG limits are 18m to 22m aft of the datum. How much mass must be removed from a hold 30m aft of the datum to bring the CG to its mid point? a. 26,800 kg b. 28,600 kg c. 86,200 kg d. 62,800 kg
Last Answer : b. 28,600 kg
Description : Definition of minor bridge e) Single span less than 12m f) Total linear water way less than 18m g) Both a) & b)* h) None of the above
Last Answer : g) Both a) & b)*
Description : Definition of major bridge a) Single span of 12m & above b) Total linear water way more than 18m c) Both a) & b)* d) None of the above
Last Answer : c) Both a) & b)*
Description : Evaluate the surface integral ∫∫ (3x i + 2y j). dS, where S is the sphere given by x 2 + y 2 + z 2 = 9. a) 120π b) 180π c) 240π d) 300π
Last Answer : b) 180π
Description : Two trains are running in opposite directions with the same speed. If the length of each train is 120 metres and they cross each other in 12 seconds, then the speed of each train (in km/hr) is: A.12 kmph B.24 kmph C.36 kmph D.48 kmph E.None of these
Last Answer : Answer – C (36 kmph) Explanation – Let the speed of each train be x m/sec. Then, relative speed of the two trains = 2x m/sec. So, 2x = (120 + 120)/12 ⇔ 2x = 20 ⇔ x = 10. ∴ Speed of each train = 10 m/sec = [10 x 18/5] km/hr = 36 km/hr
Description : A person runs opposite to that of chandigarh train at a speed of 10km/hr. If the relative speed between train and the boy running in opposite direction is 25km/hr. What is the length of the train, if it takes 10 seconds to cross a boy, when is at rest? A) 36.6 m B) 40.6 m C) 43.6m D) 41.6m
Last Answer : ANSWER : D Explanation: Speed of person = 10km/hr As the train and the running person are moving in opposite direction,therir speed values are added to find the relative speed. Relative speed = speed of train + speed of ... s Distance = speed * time = 25 / 6 * 10 = 250/6 m/s = 41.6 m
Description : Two trains of equal lengths take 10 seconds and 15 seconds respectively to cross a telegraph post. If the length of each train be 120 metres, in what time (in seconds) will they cross each other travelling in opposite direction? A.12 sec B.18 sec C.14 sec D.25 sec E.None of these
Last Answer : Answer – A (12 sec) Explanation – Speed of the first train = [120 / 10] m/sec = 12 m/sec. Speed of the second train = [120 / 15] m/sec = 8 m/sec. Relative speed = (12 + 8) = m/sec = 20 m/sec. ∴ Required time = (120 + 120) / 20 secc = 12 sec
Description : A passenger train travelling at 96 kmph completely crosses another train having half its length and travelling in opposite direction at 84 kmph, in 24 seconds. It also passes a railway platform in 90 seconds. The length of the platform is A) 1250 m B) 2258m C) 1600 m D) 3725m
Last Answer : ANSWER:C Explanation: Let the length of the first train be x metres Then, is x /2metres Relative speed = (96+84)kmph = 180 kmph Convert km/hr into m/s, = 180*5/18 = 50 m/s Therefore (x ... (800+y) = 90*480/18 y = 2400- 800 = 1600 Hence, the length of the platform is 1600 m
Description : Three charged cylindrical sheets are present in three spaces with σ = 5 at R = 2m, σ = - 2 at R = 4m and σ = -3 at R = 5m. Find the flux density at R = 3m. a) 3 b) 10/3 c) 11/3 d) 4
Last Answer : b) 10/3
Description : Find the electric field due to charge density of 1/18 and distance from a point P is 0.5 in air(in 10 9 order) a) 0 b) 1 c) 2 d) 3
Last Answer : c) 2