Education 299 Questions Ask question Search Order By: ActiveTagClear Filter 1 Votes 1 Ans A thick current carrying cable of radius R carries current I uniformly distributed across its cross section. The variation of magnetic field B(r) due to the cable with the distance ‘r’ from the axis of the cable is represented by 117 viewsAditya Bhatt Answered question 15 February 2024EducationPhysics 0 Votes 1 Ans The half life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be 109 viewsAditya Bhatt Answered question 15 February 2024EducationPhysics 1 Votes 1 Ans A capacitor of capacitance C, is connected across an ac source of voltage V, given by V = V0sinωt The displacement current between the plates of the capacitor, would then be given by 105 viewsAditya Bhatt Answered question 15 February 2024EducationPhysics 1 Votes 1 Ans A cup of coffee cools from 90C to 80C in t minutes, when the room temperature is 20°C. The time taken by a similar cup of coffee to cool from 80°C to 60°C at a room temperature same at 20°C is 113 viewsAditya Bhatt Answered question 15 February 2024EducationPhysics 1 Votes 1 Ans A body is executing simple harmonic motion with frequency ‘n’, the frequency of its potential energy is (1) n (2) 2n (3) 3n (4) 4n 128 viewsAditya Bhatt Answered question 14 February 2024EducationPhysics 1 Votes 1 Ans If E and G respectively denote energy and gravitational constant, then E/G has the dimensions of 114 viewsAditya Bhatt Answered question 14 February 2024EducationPhysics 1 Votes 1 Ans A particle is released from height S from the surface of the Earth. At a certain height its kinetic energy is three times its potential energy. The height from the surface of earth and the speed of the particle at that instant are respectively 105 viewsAditya Bhatt Answered question 14 February 2024EducationPhysics 1 Votes 1 Ans The equivalent capacitance of the combination shown in the figure is 115 viewsAditya Bhatt Answered question 14 February 2024EducationPhysics 1 Votes 1 Ans A parallel plate capacitor has a uniform electric field E in the space between the plates. If the distance between the plates is ‘d’ and the area of each plate is ‘A’, the energy stored in the capacitor is (ε0 = permittivity of free space) 112 viewsAditya Bhatt Answered question 14 February 2024EducationPhysics 1 Votes 1 Ans Polar molecules are the molecules (1) Having zero dipole moment (2) Acquire a dipole moment only in the presence of electric field due to displacement of charges (3) Acquire a dipole moment only when the magnetic field is absent (4) Having a permanent electric dipole moment 106 viewsAditya Bhatt Answered question 14 February 2024EducationPhysics 1 Votes 1 Ans In a potentiometer circuit a cell of EMF 1.5 V gives balance point at 36 cm length of wire. If another cell of EMF 2.5 V replaces the first cell, then at what length of the wire, the balance point occur? (1) 60 cm (2) 21.6 cm (3) 64 cm (4) 62 cm 105 viewsAditya Bhatt Answered question 14 February 2024EducationPhysics 1 Votes 1 Ans The effective resistance of a parallel connection that consists of four wires of equal length, equal area of cross-section and same material is 0.25 Ω. What will be the effective resistance if they are connected in series? (1) 0.25 Ω (2) 0.5 Ω (3) 1 Ω (4) 4 Ω 113 viewsAditya Bhatt Answered question 14 February 2024EducationPhysics 1 Votes 1 Ans For a plane electromagnetic wave propagating in X direction, which one of the following combination gives the correct possible directions for electric field (E) and magnetic field (B) respectively? 129 viewsAditya Bhatt Answered question 14 February 2024EducationPhysics 1 Votes 1 Ans Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are 10% of the input energy. How much power is generated by the turbine? (1) 10.2 kW (2) 8.1 kW (3) 12.3 kW (4) 7.0 kW 98 viewsAditya Bhatt Changed status to publish 14 February 2024EducationPhysics 1 Votes 1 Ans The number of photons per second on an average emitted by the source of monochromatic light of wavelength 600 nm, when it delivers the power of watt will be (h = J s) 120 viewsAditya Bhatt Answered question 14 February 2024EducationPhysics 1 Votes 1 Ans The electron concentration in an N type semiconductor is the same as hole concentration in a P type semiconductor. An external field (electric) is applied across each of them. Compare the currents in them. (1) Current in n-type = current in p-type (2) Current in p-type > current in n-type (3) Current in n-type > current in p-type (4) No current will flow in p-type, current will only flow in n-type 113 viewsAditya Bhatt Answered question 14 February 2024EducationPhysics 1 Votes 1 Ans A convex lens A of focal length 20 cm and a concave lens B of focal length 5 cm are kept along the same axis with a distance ‘d’ between them. If a parallel beam of light falling on ‘A’ leaves ‘B’ as a parallel beam, then the distance ‘d’ in cm will be (1) 25 (2) 15 (3) 50 (4) 30 102 viewsAditya Bhatt Answered question 14 February 2024EducationPhysics 1 Votes 1 Ans A spring is stretched by 5 cm by a force 10 N. The time period of the oscillations when a mass of 2 kg is suspended by it is (1) 0.0628 s (2) 6.28 s (3) 3.14 s (4) 0.628 124 viewsAditya Bhatt Answered question 14 February 2024EducationPhysics 0 Votes 1 Ans Find the value of the angle of emergence from the prism. The refractive index of the glass is 123 viewsAditya Bhatt Answered question 14 February 2024EducationPhysics 1 Votes 1 Ans The errors in the measurement which arise due to unpredictable fluctuations in temperature and voltage supply are (1) Instrumental errors (2) Personal errors (3) Least count errors (4) Random errors 124 viewsAditya Bhatt Changed status to publish 13 February 2024EducationPhysics « Previous 1 2 … 4 5 6 7 8 … 14 15 Next »
