Education 299 Questions Ask question Search Order By: ActiveTagClear Filter 1 Votes 1 Ans In a series LCR circuit the inductance L is 10 mH, capacitance C is 1 μF and resistance R is 100 Ω. The frequency at which resonance occurs is (1) 15.9 rad/s (2) 15.9 kHz (3) 1.59 rad/s (4) 1.59 kHz 154 viewsAditya Bhatt Answered question 6 February 2024EducationPhysics 1 Votes 1 Ans Calculate the ratio of the heat produced in the four arms of the Wheatstone bridge shown in Figure. 250 viewsAditya Bhatt Answered question 6 February 2024EducationPhysics 1 Votes 1 Ans Use the energy level diagram shown below to obtain the relation between three wavelengths λ1,λ2 and λ3 emitted due to the transition of electrons from the energy states C and B. 130 viewsAditya Bhatt Changed status to publish 6 February 2024EducationPhysics 1 Votes 1 Ans The magnetic field due to a current-carrying circular loop of radius 12 cm at its centre is . Find the magnetic field due to this loop at a point on the axis at a distance of 5.0 cm from the centre. 134 viewsAditya Bhatt Answered question 6 February 2024EducationPhysics 0 Votes 1 Ans A magnetic field B is confined to a region r ≤ a and points out of the paper (the z-axis), r = 0 being the centre of the circular region. A charged ring (charge = Q) of radius b, b > a and mass m lies in the x-y plane with its centre at the origin. The ring is free to rotate and is at rest. The magnetic field is brought to zero in time Δt. Find the angular velocity ω of the ring after the field vanishes. 139 viewsAditya Bhatt Answered question 6 February 2024EducationPhysics 1 Votes 1 Ans A diamagnetic substance is brought near the north or south pole of a bar magnet It will be : (a) repelled by both the poles. (b) attracted by both the poles. (c) repelled by the north pole and attracted by the south pole. (d) attracted by the north pole and repelled by the south pole. 128 viewsAditya Bhatt Answered question 5 February 2024EducationPhysics 1 Votes 1 Ans A steady current flows through a metallic wire whose area of cross-section A increases continuously from one end of the wire to the other. The magnitude of drift velocity ( ) of the free electrons as a function of A can be shown by 234 viewsAditya Bhatt Answered question 5 February 2024EducationPhysics 1 Votes 1 Ans The potential difference across a cell in an open circuit is 8 V. It falls to 4 V when a current of 4 A is drawn from it. The internal resistance of the cell is 177 viewsAditya Bhatt Answered question 5 February 2024EducationPhysics 0 Votes 1 Ans For a metallic conductor the correct representation of variation of resistance R with temperature T is : 282 viewsAditya Bhatt Answered question 5 February 2024EducationPhysics 1 Votes 1 Ans A Point charge situated at a distance r from a short electric dipole on its axis experiences a force F. If the distance of the charge is 2r, the force on the charge will be: 247 viewsAditya Bhatt Answered question 5 February 2024EducationPhysics 1 Votes 1 Ans Interference fringes are observed on a screen by illuminating two thin slits 1 mm apart with a light source (λ = 632.8 nm). The distance between the screen and the slits is 100 cm. If a bright fringe is observed on screen at a distance of 1.27 mm from the central bright fringe, then the path difference between the waves, which are reaching this point from the slits is close to : (1) 2.05 μm (2) 2.87 nm (3) 2 nm (4) 1.27 μm 137 viewsAditya Bhatt Answered question 31 January 2024EducationPhysics 0 Votes 1 Ans Magnetic materials used for making permanent magnets P and magnets in a transformer T have different properties of the following, which property best matches for the type of magnet required? (1) P: Small retentivity, large coercivity (2) P: Large retentivity, large coercivity (3) T: Large retentivity, large coercivity (4) T: Large retentivity, small coercivity 141 viewsAditya Bhatt Answered question 31 January 2024EducationPhysics 1 Votes 1 Ans A bead of mass m stays at point P (a,b) on a wire bent in the shape of a parabola y = 4 and rotating with angular speed ω (see figure). The value of ω is (neglect friction) 142 viewsAditya Bhatt Answered question 31 January 2024EducationPhysics 1 Votes 1 Ans A cylindrical vessel containing a liquid is rotated about its axis so that the liquid rises at its sides as shown in the figure. The radius of the vessel is 5 cm and the angular speed of rotation is ω rad/s.The difference in the height, h (in cm) of liquid at the centre of the vessel and at the side will be : 133 viewsAditya Bhatt Answered question 31 January 2024EducationPhysics 1 Votes 1 Ans A spherical mirror is obtained as shown in the figure from a hollow glass sphere. If an object is positioned in front of the minor, what will be the nature and magnification of the image of the object? (Figure drawn as schematic and not to scale) (1) Erect, virtual and unmagnified (2) Inverted, real and magnified (3) Erect, virtual and magnified (4) Inverted, real and unmagnified 147 viewsAditya Bhatt Answered question 31 January 2024EducationPhysics 1 Votes 1 Ans The mass density of a spherical galaxy varies as k /r over a large distance ‘r’ from its centre. In that region, a small star is in a circular orbit of radius R. Then the period of revolution, T depends on R as 120 viewsAditya Bhatt Answered question 31 January 2024EducationPhysics 1 Votes 1 Ans Consider a badminton racket with length scales as shown in the figure If the mass of the linear and circular portions of the badminton racket are the same (M) and the mass of the threads are negligible, the moment of inertia of the racket about an axis perpendicular to the handle and in the plane of the ring at, r/2 distance from the end A of the handle will be ……… 153 viewsAditya Bhatt Answered question 31 January 2024EducationPhysics 0 Votes 1 Ans White light is passed through a double slit and interference is observed on a screen 1.5 m away. The separation between the slits is 0.3 mm. The first violet and red fringes are formed 2.0 mm and 3.5 mm away from the central white fringes. The difference in wavelengths of red and violet light is……… nm. 137 viewsAditya Bhatt Answered question 31 January 2024EducationPhysics 1 Votes 1 Ans A soap bubble of radius 3 cm is formed inside another soap bubble of radius 6 cm. The radius of an equivalent soap bubble which has the same excess pressure as inside the smaller bubble with respect to the atmospheric pressure is …….. cm. 135 viewsAditya Bhatt Answered question 30 January 2024EducationPhysics 1 Votes 1 Ans Two spherical balls having equal masses with a radius of 5 cm each are thrown upwards along the same vertical direction at an interval of 3s with the same initial velocity of 35 m/s, and then these balls collide at a height of ………. m. (Take g = 10 ) 132 viewsAditya Bhatt Answered question 30 January 2024EducationPhysics « Previous 1 2 … 9 10 11 12 13 14 15 Next »
