Q.1. What type of mechanical wave exists in air and inside water? Answer Answer: Longitudinal waves exist in both air and inside the water. Q.2. What is the phase difference between the wave y = a cos(wt + kx) and y = a sin (wt + kx)? Answer Answer: Phase difference is 90° Q.3. What … Read more
Very Short Answer Type Questions [1 Mark Each] 1. Which of the following conditions is not sufficient for SHM and why? (a) Acceleration α displacement (b) Restoring force α displacement Answer Answer: Condition (a) is not sufficient as the direction of acceleration is opposite to displacement and that needs to be mentioned. 2. A particle … Read more
Very Short Answer Type Questions [1 Mark Each] Q.1. For ideal behavior of a gas, state the condition in terms of density of the gas. Answer Answer: For ideal gas, P = ρRT For ideal behavior, ρ should be low. Q.2. The velocities of three molecules A,B,C of a gas are 3V, 4V, and 5V … Read more
Very Short Answer Type Questions [1 Mark Each] Q.1. Is the heat supplied to a system always equal to the increase in its internal energy? Answer Answer: From 1st law of thermodynamics, dQ = dU + dW If dW = 0, then dQ = dU. i.e. if heat is supplied at constant volume so that … Read more
Very Short Answer Type Questions [1 Mark Each] Q.1. When a vessel containing a liquid is falling freely, does Archimedes’ principle hold good in it? Answer Answer: No – because in fall Buoyant force doesn’t exist. Q.2. A block of wood floats in a bucket of water in a lift. Will there be any change … Read more
BASIC CONCEPTS (INTRODUCTION) ELASTICITY AND PLASTICITY ELASTIC BEHAVIOUR OF SOLIDS STRESS AND STRAIN Stress Types of Stress Strain Types of Strain SOLVED EXAMPLES Illustration-01 Solution Illustration-02 Solution HOOKE’S LAW Hooke’s Law STRESS-STRAIN CURVE Stress-Strain Curve Elastic Limit Elastic Hysteresis Elastomers Substances like tissue of aorta, rubber etc. which can be stretched to cause large strains … Read more
Question 1: The mass of two bodies are doubled and the distance is halved, how will the gravitational force change? Answer Question 2: If two masses are equal and made of same material, how will the force of attraction vary with separation? Answer Question 3: What is the height at which the value of g … Read more
QUESTIONS If a particle is accelerating, it is either speeding up or speeding down. Do you agree with this statement? Two balls of different masses are thrown vertically upwards with the same speed. They pass through the point of projection in their downward motion with the same speed. Do you agree with this statement? Is … Read more
What do a child in a swing, the cone inside a speaker, a guitar, atoms in a crystal, the motion of chest cavities, and the beating of hearts all have in common? They all oscillate—-that is, they move back and forth between two points. Many systems oscillate, and they have certain characteristics in common. All … Read more
Perhaps you have noticed how the sound of a vehicle’s horn changes as the vehicle moves past you. The frequency of the sound you hear as the vehicle approaches you is higher than the frequency you hear as it moves away from you. This is one example of the Doppler effect. To see what … Read more
1. Explosions on other planets are not heard on earth. Why? [1] 2. Why longitudinal waves are called pressure waves? [1] 3. Why do tuning forks have two prongs? [1] 4. A pipe 20 cm long is closed at one end. Which harmonic mode of the pipe is resonantly excited by a 430 Hz source? … Read more
1. The girl sitting on a swing stands up. What will be the effect on periodic time of swing? 2. At what distance from the mean position, is the kinetic energy in a simple harmonic oscillator equal to potential energy? 3. A simple harmonic oscillator is represented by the equation : Y = 0.40 … Read more
Questions A disc of metal is melted and a solid sphere is formed. What will happen to the moment of inertia about a vertical axis passing through the centre? What are the unit and dimensions of moment of inertia ? Is it a vector ? Is radius of gyration of the body a … Read more
Force of gravitation : The force of attraction which exists between all objects, big or small, not only on the surface of the earth, but anywhere and everywhere in the universe, irrespective of the distances separating them, is called force of gravitation. Newton’s law of gravitation : Every body in this universe attracts every other … Read more
Hydrostatics 1. State the law of floatation? [1] Ans01. Law of floatation states that a body will float in a liquid, if weight of the liquid displaced by the immersed part of the body is at least equal to or greater than the weight of the body. 2. The blood pressure of humans is greater … Read more
Centre of Mass Assignment-1 Rotational Motion Assignment-2 … Read more
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Horizontal Projectile (1) Trajectory of horizontal projectile: (2) Displacement of Projectile: (3) Instantaneous velocity: (4) Time of flight: (5) Horizontal Range:
Here you can freely download NCERT Solutions for Class 11 , We have listed all the chapters PDF’s. All the Solutions available here are latest. There is no Login, nor Sign Up, neither Redirects, just click the downloading link, you can view your PDF and download accordingly. Latest NCERT Solutions Class 11 Physics Free PDF Download … Read more
TEST CLASS XI WORK, ENERGY & POWER Very Short Answer Type Questions: [ 1 Marks Questions ] Q1. What is the work done when a body is moved horizontally along a frictionless surface? Q2. What is the work done on a body moving in a circular path? Q3. Define 1 watt. Q4. What is kinetic energy? … Read more
Q1. A man travels a distance of 1.5 m towards East, then 2.0 m towards South and finally 4.5 m towards East. i. What is the total distance travelled? ii. What is his resultant displacement? Q2. A scooterist covers a distance of 3 kilometers in 5 minutes. Calculate his speed in : a) centimetres per … Read more
Important Questions on Unit, Dimensions & Error Calculation
Topics to be covered Force and inertia, Newton’s first law of motion; Momentum, Newton’s second law of motion, Impulse; Newton’s third law of motion; Law of conservation of linear momentum and its applications; Equilibrium of concurrent forces; Static and kinetic friction, laws of friction, rolling friction, lubrication; Examples of variable mass situation. Dynamics of uniform circular motion; Centripetal force, … Read more
Friction Introduction If we slide or try to slide a body over a surface the motion is resisted by a bonding between the body and the surface. This resistance is represented by a single force and is called friction. The force of friction is parallel to the surface and opposite to the direction of intended motion. Types … Read more
