Education 299 Questions Ask question Search Order By: ActiveTagClear Filter 1 Votes 1 Ans A source and a detector move away from each other in absence of wind with a speed of 20 m/s with respect to the ground. If the detector detects a frequency of 1800 Hz of the sound coming from the source, then the original frequency of the source considering the speed of sound in air 340 m/s will be…….. Hz. 114 viewsAditya Bhatt Answered question 30 January 2024EducationPhysics 1 Votes 1 Ans The electric field in a plane electromagnetic wave is given by If this wave falls normally on a perfectly reflecting surface having an area of 100 . If the radiation pressure exerted by the E.M. wave on the surface during a 10 minute exposure is . Find the value of x. 105 viewsAditya Bhatt Answered question 30 January 2024EducationPhysics 1 Votes 1 Ans A uniform chain of length 3 meter and mass 3 kg overhangs a smooth table with 2 meters laying on the table. If k is the kinetic energy of the chain in joule as it completely slips off the table, then the value of k is ………… 117 viewsAditya Bhatt Answered question 30 January 2024EducationPhysics 1 Votes 1 Ans The material filled between the plates of a parallel plate capacitor has a resistivity of 200 Ωm. The value of the capacitance of the capacitor is 2 pF. If a potential difference of 40 V is applied across the plates of the capacitor, then the value of leakage current flowing out of the capacitor is : (given the value of relative permittivity of material is 50) 105 viewsAditya Bhatt Answered question 30 January 2024EducationPhysics 1 Votes 1 Ans If E, L, M and G denote the quantities as energy angular momentum mass and constant of gravitation respectively, then the dimensions of P in the formula 109 viewsAditya Bhatt Answered question 30 January 2024EducationPhysics 1 Votes 1 Ans The initial mass of a rocket is 1000 kg. Calculate at what rate the fuel should be burnt so that the rocket is given an acceleration of 20 . The gases come out at a relative speed of 500 with respect to the rocket : 101 viewsAditya Bhatt Answered question 30 January 2024EducationPhysics 1 Votes 1 Ans What equal length of an iron wire and a copper-nickel alloy wire each of 2 mm diameter connected parallel to give an equivalent resistance of 3Ω? (Given the resistivities of iron and copper-nickel alloy wire is 12 μΩ cm and 51 μΩ cm respectively) (1) 82 m (2) 97 m (3) 110 m (4) 90 m 90 viewsAditya Bhatt Answered question 30 January 2024EducationPhysics 1 Votes 1 Ans In a Screw Gauge the fifth division of the circular scale coincides with the reference line when the ratchet is closed. There are 50 divisions on the circular scale and the main scale moves by 0.5 mm on a complete rotation. For a particular observation, the reading on the main scale is 5 mm and the 20th division of the circular scale coincides with the reference line. Calculate the true reading. (1) 5.00 mm (2) 5.25 mm (3) 5.15 mm (4) 5.20 mm 104 viewsAditya Bhatt Answered question 30 January 2024EducationPhysics 1 Votes 1 Ans The rms speeds of the molecules of Hydrogen, Oxygen and Carbondioxide at the same temperature are respectively then : 87 viewsAditya Bhatt Answered question 30 January 2024EducationPhysics 1 Votes 1 Ans A solid metal sphere of radius R having charge q is enclosed inside the concentric spherical shell of inner radius a and outer radius b as shown in figure. The approximate variation electric field E as a function of distance r from centre O is given by 99 viewsAditya Bhatt Answered question 30 January 2024EducationPhysics 1 Votes 1 Ans In the given figure the emf of the cell is 2.2 V and if internal resistance is 0.6Ω. Calculate the power dissipated in the whole circuit : (1) 1.32 W (2) 0.65 W (3) 2.2 W (4) 4.4 W 108 viewsAditya Bhatt Answered question 30 January 2024EducationPhysics 1 Votes 1 Ans In a photoelectric experiment ultraviolet light of wavelength 280 nm is used with lithium cathode having work function Φ = 2.5 eV. If the wavelength of incident light is switched to 400 nm, find out the change in the stopping potential. 98 viewsAditya Bhatt Answered question 30 January 2024EducationPhysics 0 Votes 1 Ans A particular hydrogen like ion emits radiation of frequency Hz when it makes transition from n = 3 to n = 1. The frequency in Hz of radiation emitted in transition from n = 2 to n = 1 will be: 99 viewsAditya Bhatt Answered question 30 January 2024EducationPhysics 1 Votes 1 Ans Identify the logic operation carried out by the given circuit:- (1) OR (2) AND (3) NOR (4) NAND 112 viewsAditya Bhatt Answered question 30 January 2024EducationPhysics 1 Votes 1 Ans A series LCR circuit driven by 300 V at a frequency of 50 Hz contains a resistance R = 3 kΩ, an inductor of inductive reactance = 250 πΩ and an unknown capacitor. The value of capacitance to maximize the average power should be : (Take = 10) 1) 4 µF (2) 25 µF (3) 400 µF (4) 40 µF 104 viewsAditya Bhatt Answered question 30 January 2024EducationPhysics 1 Votes 1 Ans An inductor coil stores 64 J of magnetic field energy and dissipates energy at the rate of 640 W when a current of 8A is passed through it. If this coil is joined across an ideal battery, find the time constant of the circuit in seconds : (1) 0.4 (2) 0.8 (3) 0.125 (4) 0.2 103 viewsAditya Bhatt Answered question 30 January 2024EducationPhysics 1 Votes 1 Ans An electric appliance supplies 6000 J/min heat to the system. If the system delivers a power of 90W. How long it would take to increase the internal energy by ? 99 viewsAditya Bhatt Answered question 30 January 2024EducationPhysics 1 Votes 1 Ans Two narrow bores of diameter 5 mm and 8 mm are joined together to form a U-shaped tube open at both ends. If this U-tube contains water, what is the difference in the level of two limbs of the tube. 102 viewsAditya Bhatt Answered question 30 January 2024EducationPhysics 1 Votes 1 Ans Car B overtakes another car A at a relative speed of 40 m/s. How fast will the image of car B appear to move in the mirror of focal length 10 cm fitted in car A, when the car B is 1.9 m away from the car A? 95 viewsAditya Bhatt Answered question 30 January 2024EducationPhysics 1 Votes 1 Ans The fractional change in the magnetic field intensity at a distance r from centre on the axis of the current carrying coil of radius ‘a’ to the magnetic field intensity at the centre of the same coil is : (Take r < a) 95 viewsAditya Bhatt Answered question 30 January 2024EducationPhysics « Previous 1 2 … 10 11 12 13 14 15 Next »
