Education 299 Questions Ask question Search Order By: ActiveTagClear Filter 1 Votes 1 Ans The potential energy of a long spring when stretched by 2 cm is U. If the spring is stretched by 8 cm, the potential energy stored in it will be (1) 2 U (2) 4 U (3) 8 U (4) 16 U 110 viewsAditya Bhatt Answered question 8 February 2024EducationPhysics 0 Votes 1 Ans In a plane electromagnetic wave travelling in free space the electric field component oscillates sinusoidally at a frequency of Hz and amplitude 48. Then the amplitude of the oscillating magnetic field is (Speed of light in free space = ) 112 viewsAditya Bhatt Answered question 8 February 2024EducationPhysics 1 Votes 1 Ans A full wave rectifier circuit consists of two PN junction diodes, a centre-tapped transformer, capacitor and a load resistance. Which of these components remove the ac ripple from the rectified output? (1) A centre-tapped transformer (2) p-n junction diodes (3) Capacitor (4) Load resistance 109 viewsAditya Bhatt Answered question 8 February 2024EducationPhysics 1 Votes 1 Ans The angular acceleration of a body moving along the circumference of a circle, is (1) Along the radius, away from centre (2) Along the radius towards the centre (3) Along the tangent to its position (4) Along the axis of rotation 133 viewsAditya Bhatt Answered question 8 February 2024EducationPhysics 0 Votes 1 Ans A football player is moving southward and suddenly turns eastward with the same speed to avoid an opponent. The force that acts on the player while turning is (1) Along eastward (2) Along northward (3) Along north-east (4) Along south-west 114 viewsAditya Bhatt Answered question 8 February 2024EducationPhysics 1 Votes 1 Ans The half life of a radioactive substance is 20 minutes. In how much time does the activity of a substance drop to 1/16 of its initial value? (1) 20 minutes (2) 40 minutes (3) 60 minutes (4) 80 minutes 151 viewsAditya Bhatt Answered question 8 February 2024EducationPhysics 1 Votes 1 Ans Two bodies of mass m and 9m are placed at a distance R. The gravitational potential on the line joining the bodies where the gravitational field equals zero will be (G = gravitational constant) 113 viewsAditya Bhatt Answered question 8 February 2024EducationPhysics 1 Votes 1 Ans For Youngs double slit experiment two statements are given below: Statement I: If the screen is moved away from the plane of slits, angular separation of the fringes remains constant. Statement II: If the monochromatic source is replaced by another monochromatic source of larger wavelength, the angular separation of fringes decreases. In the light of the above statements, choose the correct answer from the options given below: (1) Both Statement I and Statement II are true. (2) Both Statement I and Statement II are false. (3) Statement I is true but Statement II is false. (4) Statement I is false but Statement II is true. 114 viewsAditya Bhatt Answered question 8 February 2024EducationPhysics 1 Votes 1 Ans Resistance of a carbon resistor determined from colour codes is 22000 ± 5% Ω. The colour of the third band must be (1) Red (2) Green (3) Orange (4) Yellow 116 viewsAditya Bhatt Answered question 8 February 2024EducationPhysics 1 Votes 1 Ans The ratio of frequencies of fundamental harmonic produced by an open pipe to that of a closed pipe having the same length is (1) 1 : 2 (2) 2 : 1 (3) 1 : 3 (4) 3 : 1 125 viewsAditya Bhatt Answered question 8 February 2024EducationPhysics 0 Votes 1 Ans The temperature of a gas is –50C. To what temperature the gas should be heated so that the rms speed is increased by 3 times? 160 viewsAditya Bhatt Answered question 8 February 2024EducationPhysics 0 Votes 1 Ans The work functions of Caesium Cs Potassium K and Sodium Na are 2.14 eV, 2.30 eV and 2.75 eV respectively. If incident electromagnetic radiation has an incident energy of 2.20 eV, which of these photosensitive surfaces may emit photoelectrons? (1) Cs only (2) Both Na and K (3) K only (4) Na only 114 viewsAditya Bhatt Answered question 8 February 2024EducationPhysics 0 Votes 1 Ans Let a wire be suspended from the ceiling rigid support and stretched by a weight W attached at its free end. The longitudinal stress at any point of cross-sectional area A of the wire is (1) 2W/A (2) W/A (3) W/2A (4) Zero 106 viewsAditya Bhatt Changed status to publish 8 February 2024EducationPhysics 0 Votes 1 Ans A vehicle travels half the distance with speed v and the remaining distance with speed 2v. Its average speed is 145 viewsAditya Bhatt Answered question 8 February 2024EducationPhysics 1 Votes 1 Ans An electric dipole is placed at an angle of 30 with an electric field of intensity. It experiences a torque equal to 4 N m. Calculate the magnitude of charge on the dipole, if the dipole length is 2 cm. (1) 8 mC (2) 6 mC (3) 4 mC (4) 2 mC 108 viewsAditya Bhatt Answered question 8 February 2024EducationPhysics 1 Votes 1 Ans A 12V 60W lamp is connected to the secondary of a step-down transformer, whose primary is connected to ac mains of 220 V. Assuming the transformer to be ideal, what is the current in the primary winding? (1) 0.27 A (2) 2.7 A (3) 3.7 A (4) 0.37 A 119 viewsAditya Bhatt Answered question 8 February 2024EducationPhysics 0 Votes 1 Ans The magnetic energy stored in an inductor of inductance 4 μH carrying a current of 2 A is (1) 4 μJ (2) 4 mJ (3) 8 mJ (4) 8 μJ 153 viewsAditya Bhatt Changed status to publish 8 February 2024EducationPhysics 0 Votes 1 Ans If the galvanometer G does not show any deflection in the circuit shown the value of R is given by 102 viewsAditya Bhatt Answered question 8 February 2024EducationPhysics 1 Votes 1 Ans In the hydrogen spectrum the shortest wavelength in the Balmer series is λ. The shortest wavelength in the Bracket series is 123 viewsAditya Bhatt Changed status to publish 8 February 2024EducationPhysics 1 Votes 1 Ans Light travels a distance x in time t1 in air and 10x in time t2 in another denser medium. What is the critical angle for this medium? 121 viewsAditya Bhatt Answered question 7 February 2024EducationPhysics « Previous 1 2 … 8 9 10 11 12 … 14 15 Next »
