Physics 299 Questions Ask question Search Order By: ActiveCategoryClear Filter 1 Votes 1 Ans The mean free path for a gas with molecular diameter d and number density n can be expressed as : 109 viewsAditya Bhatt Answered question 19 February 2024EducationPhysics 1 Votes 1 Ans A 40 μF capacitor is connected to a 200 V 50 Hz ac supply. The rms value of the current in the circuit is, nearly : (1) 1.7 A (2) 2.05 A (3) 2.5 A (4) 25.1 A 119 viewsAditya Bhatt Answered question 19 February 2024EducationPhysics 1 Votes 1 Ans The increase in the width of the depletion region in a PN junction diode is due to : (1) forward bias only (2) reverse bias only (3) both forward bias and reverse bias (4) increase in forward current 114 viewsAditya Bhatt Answered question 19 February 2024EducationPhysics 0 Votes 1 Ans In a certain region of space with volume 0.2 , the electric potential is found to be 5 V throughout. The magnitude of electric field in this region is : (1) zero (2) 0.5 N/C (3) 1 N/C (4) 5 N/C 125 viewsAditya Bhatt Answered question 19 February 2024EducationPhysics 1 Votes 1 Ans A spherical conductor of radius 10 cm has a charge of distributed uniformly. What is the magnitude of electric field at a point 15 cm from the centre of the sphere? 113 viewsAditya Bhatt Answered question 19 February 2024EducationPhysics 1 Votes 1 Ans Light with an average flux of 20 W/ falls on a non-reflecting surface at normal incidence having a surface area 20 . The energy received by the surface during time span of 1 minute is : 102 viewsAditya Bhatt Answered question 19 February 2024EducationPhysics 1 Votes 1 Ans Two particles of mass 5 kg and 10 kg respectively are attached to the two ends of a rigid rod of length 1 m with negligible mass. The centre of mass of the system from the 5 kg particle is nearly at a distance of : (1) 33 cm (2) 50 cm (3) 67 cm (4) 80 cm 111 viewsAditya Bhatt Answered question 19 February 2024EducationPhysics 1 Votes 1 Ans In a guitar two strings A and B made of same material are slightly out of tune and produce beats of frequency 6 Hz. When tension in B is slightly decreased, the beat frequency increases to 7 Hz. If the frequency of A is 530 Hz, the original frequency of B will be: (1) 523 Hz (2) 524 Hz (3) 536 Hz (4) 537 Hz 101 viewsAditya Bhatt Answered question 19 February 2024EducationPhysics 1 Votes 1 Ans A screw gauge has least count of 0.01 mm and there are 50 divisions in its circular scale.The pitch of the screw gauge is : 117 viewsAditya Bhatt Answered question 19 February 2024EducationPhysics 1 Votes 1 Ans The phase difference between displacement and acceleration of a particle in a simple harmonic motion is : 125 viewsAditya Bhatt Answered question 19 February 2024EducationPhysics 1 Votes 1 Ans The solids which have the negative temperature coefficient of resistance are: (1) metals (2) insulators only (3) semiconductors only (4) insulators and semiconductors 109 viewsAditya Bhatt Answered question 19 February 2024EducationPhysics 1 Votes 1 Ans A body weighs 72 N on the surface of the earth. What is the gravitational force on it, at a height equal to half the radius of the earth? (1) 48 N (2) 32 N (3) 30 N (4) 24 N 107 viewsAditya Bhatt Answered question 19 February 2024EducationPhysics 1 Votes 1 Ans The energy equivalent of 0.5 g of a substance is : 118 viewsAditya Bhatt Answered question 19 February 2024EducationPhysics 0 Votes 1 Ans Two cylinders A and B of equal capacity are connected to each other via a stop cock. A contains an ideal gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stop cock is suddenly opened. The process is : (1) isothermal (2) adiabatic (3) isochoric (4) isobaric 99 viewsAditya Bhatt Answered question 19 February 2024EducationPhysics 1 Votes 1 Ans A ray is incident at an angle of incidence i on one surface of a small angle prism (with angle of prism A) and emerges normally from the opposite surface. If the refractive index of the material of the prism is μ, then the angle of incidence is nearly equal to : 115 viewsAditya Bhatt Answered question 19 February 2024EducationPhysics 1 Votes 1 Ans A cylinder contains hydrogen gas at pressure of 249 kPa and temperature 27°C. Its density is : (R = 8.3 J/mol K) 109 viewsAditya Bhatt Answered question 19 February 2024EducationPhysics 1 Votes 1 Ans The ratio of contributions made by the electric field and magnetic field components to the intensity of an electromagnetic wave is : (c = speed of electromagnetic waves) 108 viewsAditya Bhatt Answered question 19 February 2024EducationPhysics 1 Votes 1 Ans For which one of the following Bohr model is not valid? (1) Hydrogen atom (2) Singly ionised helium atom (He+) (3) Deuteron atom (4) Singly ionised neon atom (Ne+) 112 viewsAditya Bhatt Edited answer 19 February 2024EducationPhysics 1 Votes 1 Ans A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44 W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit? (1) 0.2 A (2) 0.4 A (3) 2 A (4) 4 A 112 viewsAditya Bhatt Answered question 17 February 2024EducationPhysics 1 Votes 1 Ans From a circular ring of mass M and radius R an arc corresponding to a 90° sector is removed. The moment of inertia of the remaining part of the ring about an axis passing through the centre of the ring and perpendicular to the plane of the ring is ‘K’ times . Then the value of ‘K’ is 105 viewsAditya Bhatt Answered question 17 February 2024EducationPhysics « Previous 1 2 3 4 5 6 … 14 15 Next »
