11th Physics

Chapter – 8 Appendices Q1. A steel wire of length 4.7 m and cross-sectional area 3.0 × 10-5 m2 stretches by the same amount as a copper wire of length 3.5 m and cross-sectional area of 4.0 × 10–5 m2 under a given load. What is the ratio of Young’s modulus of steel to that … Read more

Chapter – 7 Gravitation Question 1. Answer the following: (a) You can shield a charge from electrical forces by putting it inside a hollow conductor. Can you shield a body from the gravitational influence of nearby matter by putting it inside a hollow sphere or by some other means? (b) An astronaut inside a small … Read more

Chapter – 6 System of Particles And Rotational Motion Question 1. Give the location of the centre of mass of a (i) sphere, (ii) cylinder, (iii) ring, and (iv) cube, each of uniform mass density. Does the centre of mass of a body necessarily lie inside the body? Answer: In all the four cases, as … Read more

Chapter – 5 Work, Energy And Power Question 1. The sign of work done by a force on a body is important to understand. State carefully if the following quantities are positive or negative: (a) Work done by a man in lifting a bucket out of a well by means of a rope tied to … Read more

Chapter – 4 Laws of Motion 1. Give the magnitude and direction of the net force acting on (a) a drop of rain falling down with a constant speed (b) a cork of mass 10 g floating on water (c) a kite skillfully held stationary in the sky (d) a car moving with a constant … Read more

Chapter – 3 Motion in a plane Q-1: State whether the following physical quantities are scalar or vector. (i) Mass (ii) Volume (iii) Speed (iv) Acceleration (v) Density (vi) Number of moles (vii) Velocity (viii) Angular frequency (ix) Displacement (x) Angular velocity Ans: Scalar: Density, mass, speed, volume, angular frequency, number of moles.Vector: Velocity, acceleration, … Read more

Chapter – 2 Motion in a straight line Q 1. In which of the following examples of motion can the body be consider dapp rox ima tely a point object? (a) A railway carriage moving without jerks between two stations. (b) A cap on top of a man cycling smoothly on a circular track. (c) … Read more

Chapter – 1 Unit And Measurement 2.1 Fill in the blanks. (a) The volume of a cube of side 1 cm is equal to …..m3 (b) The surface area of a solid cylinder of radius 2.0 cm and height 10.0 cm is equal to…(mm)2 (c) A vehicle moving with a speed of 18 km h–1 … Read more