Ask question Search Order By: ActiveCategoryTagClear Filter 0 Votes 0 Ans At what temperature will the rms speed of oxygen molecules become just sufficient for escaping from the Earth’s atmosphere? 99 viewsAditya Bhatt Changed status to publish 3 May 2024EducationPhysics 0 Votes 0 Ans The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe. If the length of the closed organ pipe is 20 cm, the length of the open organ pipe is (1) 12.5 cm (2) 8 cm (3) 13.2 cm (4) 16 cm 113 viewsAditya Bhatt Changed status to publish 3 May 2024EducationPhysics 0 Votes 0 Ans The volume V of a monatomic gas varies with its temperature T as shown in the graph. The ratio of work done by the gas, to the heat absorbed by it, when it undergoes a change from state A to state B, is 110 viewsAditya Bhatt Changed status to publish 3 May 2024EducationPhysics 1 Votes 1 Ans Average velocity of a particle executing SHM in one complete vibration is : 140 viewsAditya Bhatt Answered question 22 March 2024EducationPhysics 1 Votes 1 Ans For a P type semiconductor which of the following statements is true ? (1)Electrons are the majority carriers and trivalent atoms are the dopants. (2)Holes are the majority carriers and trivalent atoms are the dopants. (3)Holes are the majority carriers and pentavalent atoms are the dopants. (4)Electrons are the majority carriers and pentavalent atoms are the dopants. 120 viewsAditya Bhatt Answered question 22 March 2024EducationPhysics 1 Votes 1 Ans Six similar bulbs are connected as shown in the figure with a DC source of emf E and zero internal resistance. The ratio of power consumption by the bulbs when (i) all are glowing and (ii) in the situation when two from section A and one from section B are glowing, will be : 139 viewsAditya Bhatt Changed status to publish 22 March 2024EducationPhysics 1 Votes 1 Ans Two similar thin equi-convex lenses, of focal length f each, are kept coaxially in contact with each other such that the focal length of the combination is F1. When the space between the two lenses is filled with glycerine (which has the same refractive index (μ = 1.5) as that of glass) then the equivalent focal length is F2. The ratio F1 : F2 will be : (1)2 : 1 (2)1 : 2 (3)2 : 3 (4)3 : 4 141 viewsAditya Bhatt Changed status to publish 22 March 2024EducationPhysics 1 Votes 1 Ans A body weighs 200 N on the surface of the earth. How much will it weigh half way down to the centre of the earth ? (1)150 N (2)200 N (3)250 N (4)100 N 150 viewsAditya Bhatt Answered question 22 March 2024EducationPhysics 0 Votes 1 Ans Pick the wrong answer in the context with rainbow. (1)When the light rays undergo two internal reflections in a water drop, a secondary rainbow is formed (2)The order of colours is reversed in the secondary rainbow (3)An observer can see a rainbow when his front is towards the sun (4)Rainbow is a combined effect of dispersion refraction and reflection of sunlight 156 viewsAditya Bhatt Answered question 22 March 2024EducationPhysics 1 Votes 1 Ans Increase in temperature of a gas filled in a container would lead to : (1)Increase in its mass (2)Increase in its kinetic energy (3)Decrease in its pressure (4)Decrease in intermolecular distance 133 viewsAditya Bhatt Answered question 22 March 2024EducationPhysics 1 Votes 1 Ans A disc of radius 2 m and mass 100 kg rolls on a horizontal floor. Its centre of mass has speed of 20 cm/s. How much work is needed to stop it? (1)3 J (2)30 kJ (3)2 J (4)1 J 139 viewsAditya Bhatt Answered question 22 March 2024EducationPhysics 1 Votes 1 Ans Which colour of the light has the longest wavelength? (1)Red (2)Blue (3)Green (4)Violet 129 viewsAditya Bhatt Answered question 22 March 2024EducationPhysics 1 Votes 1 Ans Q. In which of the following devices the eddy current effect is not used? (1)Induction furnace (2)Magnetic braking in train (3)Electromagnet (4)Electric heater 145 viewsAditya Bhatt Answered question 22 March 2024EducationPhysics 1 Votes 1 Ans In a double slit experiment when light of wavelength 400 nm was used, the angular width of the first minima formed on a screen placed 1 m away, was found to be 0.2°. What will be the angular width of the first minima, if the entire experimental apparatus is immersed in water? (μ water = 4/3) 144 viewsAditya Bhatt Answered question 22 March 2024EducationPhysics 1 Votes 1 Ans Body A of mass 4m moving with speed u collides with another body B of mass 2m, at rest. The collision is head on and elastic in nature. After the collision the fraction of energy lost by the colliding body A is : 118 viewsAditya Bhatt Answered question 22 March 2024EducationPhysics 1 Votes 1 Ans Ionized hydrogen atoms and alpha particles with same momenta enters perpendicular to a constant magnetic field, B. The ratio of their radii of their paths rH : rα will be : (1)2 : 1 (2)1 : 2 (3)4 : 1 (4)1 : 4 136 viewsAditya Bhatt Answered question 22 March 2024EducationPhysics 1 Votes 1 Ans A mass m is attached to a thin wire and whirled in a vertical circle. The wire is most likely to break when: (1)the mass is at the highest point (2)the wire is horizontal (3)the mass is at the lowest point (4)inclined at an angle of 60° from vertical 127 viewsAditya Bhatt Answered question 22 March 2024EducationPhysics 1 Votes 1 Ans When a block of mass M is suspended by a long wire of length L, the length of the wire becomes (L + l). The elastic potential energy stored in the extended wire is : 146 viewsAditya Bhatt Answered question 21 March 2024EducationPhysics 1 Votes 1 Ans A metal disc of radius 100 cm is rotated at a constant angular speed of 60 rad/s in a plane at right angles to an external field of magnetic induction 0.05 Wb/m2 . The emf induced between the centre and a point on the rim will be 87 viewsAditya Bhatt Answered question 12 March 2024 1 Votes 1 Ans A series LCR circuit is connected to an ac voltage source. When L is removed from the circuit, the phase difference between current and voltage is π/3 . If instead C is removed from the circuit, the phase difference is again π/3 between current and voltage. The power factorof the 158 viewsAditya Bhatt Changed status to publish 3 March 2024EducationPhysics « Previous 1 2 3 4 … 15 16 Next »
