Ask question Search Order By: ActiveCategoryTagClear Filter 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 ? 153 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. 148 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? 137 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) 128 viewsAditya Bhatt Answered question 30 January 2024EducationPhysics 0 Votes 1 Ans A wire of length 314 cm carrying current of 14 A is bent to form a circle. The magnetic moment of the coil is _______ A-m2 142 viewsAditya Bhatt Answered question 29 January 2024EducationPhysics 1 Votes 1 Ans Two light beams of intensities 4I and 9I interfere on a screen. The phase difference between these beams on the screen at point A is zero and at point B is π. The difference in resultant intensities, at the point A and B, will be _________ I 150 viewsAditya Bhatt Answered question 29 January 2024EducationPhysics 1 Votes 1 Ans If the acceleration due to gravity experienced by a point mass at a height h above the surface of the earth is the same as that of the acceleration due to gravity at a depth αh (h << Re) from the earth's surface. The value of α will be _________. (use Re = 6400 km) 171 viewsAditya Bhatt Changed status to publish 29 January 2024EducationPhysics 0 Votes 1 Ans An object is projected in the air with initial velocity u at an angle θ. The projectile motion is such that the horizontal range R, is maximum. Another object is projected in the air with a horizontal range half of the range of the first object. The initial velocity remains the same in both cases. The value of the angle of projection, at which the second object is projected, will be _______degree. 207 viewsAditya Bhatt Changed status to publish 29 January 2024EducationPhysics 0 Votes 1 Ans In an experiment to find out the diameter of wire using a screw gauge the following observation were noted : (a) Screw moves 0.5 mm on the main scale in one complete rotation (b) Total divisions on circular scale = 50 (c) The main scale reading is 2.5 mm (d) 45th division of the circular scale is in the pitch line (e) Instrument has 0.03 mm negative error Then the diameter of the wire is : (A) 2.92 mm (B) 2.54 mm (C) 2.98 mm (D) 3.45 mm 154 viewsAditya Bhatt Answered question 29 January 2024EducationPhysics 1 Votes 1 Ans A traveling microscope has 20 divisions per cm on the main scale while its Vernier scale has a total of 50 divisions and 25 Vernier scale divisions are equal to 24 main scale divisions, what is the least count of the traveling microscope? (A) 0.001 cm (B) 0.002 mm (C) 0.002 cm (D) 0.005 cm 155 viewsAditya Bhatt Answered question 29 January 2024EducationPhysics 1 Votes 1 Ans Find the modulation index of an AM wave having 8 V variation where maximum amplitude of the AM wave is 9 V. (A) 0.8 (B) 0.5 (C) 0.2 (D) 0.1 142 viewsAditya Bhatt Answered question 29 January 2024EducationPhysics 0 Votes 1 Ans Find the ratio of energies of photons produced due to the transition of an election of a hydrogen atom from its (i) second permitted energy level to the first level, and (ii) the highest permitted energy level to the first permitted level. 165 viewsAditya Bhatt Changed status to publish 29 January 2024EducationPhysics 1 Votes 1 Ans The kinetic energy of the emitted electron is E when the light incident on the metal has wavelength λ. To double the kinetic energy, the incident light must have wavelength : 146 viewsAditya Bhatt Answered question 29 January 2024EducationPhysics 1 Votes 1 Ans A coil of inductance 1 H and resistance 100Ω is connected to a battery of 6 V. Determine approximately : (a) The time elapsed before the current acquire half of its steady–state value (b) The energy stored in the magnetic field associated with the coil at an instant 15 ms after the circuit is switched on. (Given In2 = 0.693, 138 viewsAditya Bhatt Answered question 29 January 2024EducationPhysics 1 Votes 1 Ans An alternating emf E = 440 sin 100 πt is applied to a circuit containing an inductance of √2/π. If an a.c. ammeter is connected in the circuit, its reading will be : (A) 4.4 A (B) 1.55 A (C) 2.2 A (D) 3.11 A 138 viewsAditya Bhatt Answered question 29 January 2024EducationPhysics 1 Votes 1 Ans Two metallic wires of identical dimensions are connected in series. If σ1 and σ2 are the conductivities of these wires respectively, the effective conductivity of the combination is : 145 viewsAditya Bhatt Answered question 29 January 2024EducationPhysics 2 Votes 1 Ans The period of oscillation of simple pendulum of length L suspended from the roof of the vehicle which moves without friction, down an inclined plane of inclination α, is given by 139 viewsAditya Bhatt Answered question 28 January 2024EducationPhysics 1 Votes 1 Ans If the length of a wire is made double and radius is halved of its respective values. Then, the Young’s modulus of the material of the wire will : (A) Remains same (B) Become 8 times its initial value (C) Become 1th/4 of its initial value (D) Become 4 times its initial value 144 viewsAditya Bhatt Answered question 28 January 2024EducationPhysics 0 Votes 1 Ans Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Clothes containing oil or grease stains cannot be cleaned by water wash. Reason (R): Because the angle of contact between the oil/ grease and water is obtuse. In the light of the above statements, choose the correct answer from the option given below. (A) Both (A) and (R) are true and (R) is the correct explanation of (A) (B) Both (A) and (R) are true but (R) is not the correct explanation of (A) (C) (A) is true but (R) is false (D) (A) is true but (R) is true 161 viewsAditya Bhatt Answered question 28 January 2024EducationPhysics 1 Votes 1 Ans A ball is projected with kinetic energy E at an angle of 60° to the horizontal. The kinetic energy of this ball at the highest point of its flight will become : 140 viewsAditya Bhatt Changed status to publish 28 January 2024EducationPhysics « Previous 1 2 … 11 12 13 14 15 16 Next »
