Physics 299 Questions Ask question Search Order By: ActiveCategoryClear Filter 1 Votes 1 Ans A resistance wire connected in the left gap of a metre bridge balances a 10Ω resistance in the right gap at a point which divides the bridge wire in the ratio 3 : 2. If the length of the resistance wire is 1.5 m, then the length of 1 Ω of the resistance wire is : 117 viewsAditya Bhatt Answered question 20 February 2024EducationPhysics 1 Votes 1 Ans A capillary tube of radius r is immersed in water and water rises in it to a height h. The mass of the water in the capillary is 5 g. Another capillary tube of radius 2r is immersed in water. The mass of water that will rise in this tube is : (1) 2.5 g (2) 5.0 g (3) 10.0 g (4) 20.0 g 115 viewsAditya Bhatt Answered question 20 February 2024EducationPhysics 1 Votes 1 Ans A ball is thrown vertically downward with a velocity of 20 m/s from the top of a tower. It hits the ground after some time with a velocity of 80 m/s. The height of the tower is : (1) 360 m (2) 340 m (3) 320 m (4) 300 m 146 viewsAditya Bhatt Answered question 20 February 2024EducationPhysics 0 Votes 1 Ans An electron is accelerated from rest through a potential difference of V volt. If the de Broglie wavelength of the electron is , the potential difference is : 119 viewsAditya Bhatt Answered question 20 February 2024EducationPhysics 1 Votes 1 Ans The quantities of heat required to raise the temperature of two solid copper spheres of radii r1 and r2 (r1= 1.5 r2) through 1 K are in the ratio : 117 viewsAditya Bhatt Answered question 20 February 2024EducationPhysics 1 Votes 1 Ans A long solenoid of 50 cm length having 100 turns carries a current of 2.5 A. The magnetic field at the centre of the solenoid is : 125 viewsAditya Bhatt Answered question 20 February 2024EducationPhysics 1 Votes 1 Ans An iron rod of susceptibility 599 is subjected to a magnetising field of 1200A/m. The permeability of the material of the rod is : 129 viewsAditya Bhatt Answered question 20 February 2024EducationPhysics 1 Votes 1 Ans A short electric dipole has a dipole moment of . The electric potential due to the dipole at a point at a distance of 0.6 m from the centre of the dipole, situated on a line making an angle of 60° with the dipole axis is : 125 viewsAditya Bhatt Answered question 20 February 2024EducationPhysics 1 Votes 1 Ans Assume that light of wavelength 600 nm is coming from a star. The limit of resolution of telescope whose objective has a diameter of 2 m is : 94 viewsAditya Bhatt Answered question 20 February 2024EducationPhysics 1 Votes 1 Ans Dimensions of stress are 107 viewsAditya Bhatt Answered question 20 February 2024EducationPhysics 1 Votes 1 Ans The capacitance of a parallel plate capacitor with air as medium is 6 μF. With the introduction of a dielectric medium, the capacitance becomes 30 μF. The permittivity of the medium is : 130 viewsAditya Bhatt Answered question 20 February 2024EducationPhysics 1 Votes 1 Ans In Young double slit experiment if the separation between coherent sources is halved and the distance of the screen from the coherent sources is doubled, then the fringe width becomes: (1) double (2) half (3) four times (4) one-fourth 102 viewsAditya Bhatt Answered question 20 February 2024EducationPhysics 1 Votes 1 Ans The color code of a resistance is given below The values of resistance and tolerance, respectively, are 114 viewsAditya Bhatt Answered question 20 February 2024EducationPhysics 1 Votes 1 Ans Which of the following graph represents the variation of resistivity (ρ) with temperature (T) for copper? 137 viewsAditya Bhatt Answered question 20 February 2024EducationPhysics 1 Votes 1 Ans The average thermal energy for a mono-atomic gas is : ( is Boltzmann constant and T, absolute temperature) 117 viewsAditya Bhatt Answered question 20 February 2024EducationPhysics 1 Votes 1 Ans A wire of length L area of cross section A is hanging from a fixed support. The length of the wire changes to L1 when mass M is suspended from its free end. The expression for Young’s modulus is : 125 viewsAditya Bhatt Answered question 20 February 2024EducationPhysics 1 Votes 1 Ans Two bodies of mass 4 kg and 6 kg are tied to the ends of a massless string. The string passes over a pulley which is frictionless (see figure). The acceleration of the system in terms of acceleration due to gravity (g) is : 111 viewsAditya Bhatt Answered question 20 February 2024EducationPhysics 0 Votes 1 Ans The energy required to break one bond in DNA is . This value in eV is nearly: (1) 6 (2) 0.6 (3) 0.06 (4) 0.006 102 viewsAditya Bhatt Answered question 20 February 2024EducationPhysics 1 Votes 1 Ans Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and the intensity is doubled? (1) doubled (2) four times (3) one-fourth (4) zero 128 viewsAditya Bhatt Answered question 19 February 2024EducationPhysics 1 Votes 1 Ans For transistor action which of the following statements is correct? (1) Base, emitter and collector regions should have same doping concentrations. (2) Base, emitter and collector regions should have same size. (3) Both emitter junction as well as the collector junction are forward biased. (4) The base region must be very thin and lightly doped 123 viewsAditya Bhatt Answered question 19 February 2024EducationPhysics « Previous 1 2 3 4 5 … 14 15 Next »
