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VSEPR THEORY: DEFINITION, POSTULATES OF THE VSEPR MODEL OR VSEPR THEORY What is VSEPR theory? Valance Shell Electron Pair Repulsion theory also called VSEPR theory was the theory given by Sidgwick and Powell. This theory describes the influence of the lone pair of electrons on the bonding electron and also predicts the shape of the molecules. This theory is based on the number of valance electrons present in the central atom of a molecule. Statement : "A molecule takes a shape that minimizes the repulsion between the bonding and non-bonding pair of an electron." Postulates of VSEPR theory: Following are the postulates of the VSEPR theory : 1 . In any covalent molecule, there is a central atom around which other atoms are arranged.  2 . The shape of the molecule is determined by the number of electron pairs present in the valence shell of the central atom. 3 . If the central atom of a molecule is surrounded by electron pair of dissimilar atoms then the molecule will have irre...

PHYSICS ENTRANCE MODEL QUESTIONS FOR CLASS 11 1. Where does the Selective accumulation of iodine occurs in:     a) Intestine     b) Thymus     c) Thyroid     d) Liver     Ans: c 2. What is another name for Sympathetic nervous system:     a) Central nervous system     b) Peripheral nervous system     c) Autonomous nervous system     d) None     Ans: c 3. Endocrine disorder leads to which one of the following?     a) Pneumonia      b) Jaundice       c) Typhoid      d) Goitre      Ans: d 4. Where does the digestion of cellulose takes place in the rabbit:     a) Colon      b) Ileum     c) Caecum      d) Rectum     Ans: c 5. What is the structure that prevents the entry of food into human's respiratory tract?      a) Larynx...

SIMPLE HARMONIC MOTION: DEFINITION, EQUATIONS, RELATIONS EXECUTING SIMPLE HARMONIC MOTION What is Simple Harmonic Motion? Simple Harmonic Motion (SHM) is defined as a to and fro of motion of an object about a mean position. The motion of a body is said to be simple harmonic if its acceleration is always, a) directed towards a fixed point (mean position) b) directly proportional to the distance from a fixed point.   When a body is displaced in simple harmonic motion , a restoring force is set up. Due to this restoring force, the body comes back to its equilibrium, it gets kinetic energy and the body moves away from the equilibrium position. In this way, the body continuously oscillates back and forth about the mean position. Therefore, the motion is said to be a Simple Harmonic Motion (SHM) . Relation between acceleration and displacement of a particle executing simple harmonic motion (SHM): Consider a particle having mass 'm' moving with a uniform circular motion ...

CHEMICAL EFFECTS OF ELECTRIC CURRENT:  PHYSICS SHORT ANSWER QUESTIONS   CHEMICAL EFFECTS OF ELECTRIC CURRENT When an electric current flows through conducting materials, it produces chemical reactions or effects on the materials, either on their physical properties or chemical properties or on both. These effects are studied under electrolysis and these effects are called the chemical effects of electric current . Electrolysis: Electrolysis basically means the decomposition of a substance or a solution in its molten form when an electric current is passed through the substance. Electrolytes: Electrolytes are substances or compounds which has their own electric charge and are capable of conducting electricity. They contain ions that are dissociated into positively and negatively charged particles and thus produce an electric current. Acid Solutions, Bases, Salt solution, and Acidulated water are examples of electrolytes. ...

WAVE MOTION:  PHYSICS SHORT ANSWER QUESTIONS What is Wave Motion ? A wave is a disturbance in a medium and the wave motion explains how a wave moves in any medium. Air isn't a wave. The particles of air move in random directions. However sound can act as a medium for the propagation of other waves. For example, a sound is basically a pressure wave that moves in air through compressions (regions of high density in the air molecules) and rarefactions. Following are some of the chosen V ery Important Physics Short Answer Questions of the Wave Motion module: 1. How are stationary waves formed? Ans: Waves of the same wavelength and amplitude traveling with the same speed through a medium in opposite direction and superimpose upon each other, they give rise to a wave which is called stationary. In stationary waves, there is a certain point where the amplitude of vibration is always zero. point is known as nodes. Midway between these nodes, there are other points where the amplitude o...

KINEMATICS: PHYSICS SHORT ANSWER QUESTIONS Basically, there are two ways to do a study of motion, Kinematics,  and Dynamic .  Kinematics  is the branch of mechanics and study of the motion of the objects, without making reference to the forces that cause motion. Similarly, the dynamic is also the same but it gives the reference to the force that creates motion. A few examples of Kinematics are: train moving, Bus moving, moving water in a river, etc. 1. Under what condition will the distance and displacement of a moving object will have the same magnitude? Ans: It is possible only when the object moves on a straight line in the same direction. 2. Can a body have a constant speed but a varying velocity? Ans: Yes, it is possible when the body is moving in a circular path with a uniform speed. At every point of its path, the speed is the same but the velocity is directed tangentially. 3. Can a body have a constant velocity but a varying speed? Ans: No, it is n...