All questions
- Which of the forces involved in dragging a heavy object on a smooth, horizontal surface, have the same magnitude? The gravitational force and the reaction force in vertical direction have same magnitude. Friction is not action as the horizontal surface i... 1
- Joule is the unit of ... (i) force (ii) work (iii) power (iv) energy Joule is the unit of work and energy 2
- For work to be performed, energy must be .... (i) transferred from one place to another (ii) concentrated correct option is a For work to be performed, energy must be transferred from one place to another. 1
- Why is the work done on an object moving with uniform circular motion zero? Answer: Because the centripetal force is always perpendicular to the direction of motion, so W = Fscos 90^° = 0 . In uniform circular motion... 1
- If an object has 0 momentum, does it have kinetic energy? Explain your answer. Answer: No. If an object has zero momentum, its kinetic energy is also zero. Momentum is p = mv . The mass m of an object is never zero, so... 1
- Determine the amount of work done when an object is displaced at an angle of 30o with respect to the direction of t Answer: W = Fscos 30^° = sqrt3/2Fs ≈ 0.866 Fs When a force F acts at an angle θ to the displacement s , only the component of the force alon... 1
- Prove that the kinetic energy of a freely falling object on reaching the ground is nothing but the transformation Answer: At height h the object has potential energy mgh and zero kinetic energy; on reaching the ground its kinetic energy is also mgh, so a... 1
- A slit of width 'a' is illuminated by white light. For what value of 'a' will the first minima for red light fall A slit of width 'a' is illuminated by white light. For what value of 'a' will the first minima for red light fall at an angle of 300 2
- Derive the formula for the kinetic energy of an object of mass m, moving with velocity v. Kinetic energy is the energy possessed by an object by virtue of its motion. K.E=1/2 mV² Derivation: Let us consider an object of m which is... 1
- Explain the difference between potential energy and kinetic energy. Kinetic Energy Potential Energy (i) Kinetic energy is the energy possessed by the body due to its motion. (i) Potential energy is the energy... 1
- When to Use Internal and External JavaScript Code? Answer: Use internal JavaScript for small, page-specific code; use external JavaScript (a separate .js file) when the code is long or shared... 1
- What are Cookies in JavaScript? Answer: Cookies are small pieces of text data (name=value pairs) that a website stores in the user's browser, and JavaScript can read and wr... 1
- How to detect the operating system on the client machine? Answer: Read the browser's navigator object, mainly navigator.userAgent (or navigator.platform), and check it for OS names. let ua = navigat... 1
- Difference between “==” and “===”? “==” checks only for equality in value, whereas “===” is a stricter equality test and returns false if either the value or the type of the t... 1
- How can you convert the string of any base to an integer in JavaScript? The parseInt() function is used to convert numbers between different bases. parseInt() takes the string to be converted as its first paramet... 1
- What is called Variable typing in Javascript? Variable typing is used to assign a number to a variable. The same variable can be assigned to a string. Example: i = 10; i = "string;" This... 1
- What are all the looping structures in JavaScript? Following are looping structures in Javascript: For While Do-while loops 1
- How to read and write a file using JavaScript? There are two ways to read and write a file using JavaScript Using JavaScript extensions Using a web page and Active X objects 2
- How can the style/class of an element be changed? It can be done in the following way: document.getElementById("myText"). style. fontSize = "20"; or document. getElementById ("myText"). clas... 1
- Does JavaScript support automatic type conversion? Yes, JavaScript does support automatic type conversion. It is the common way of type conversion used by JavaScript developers 1
- How you can submit a form using JavaScript? Answer: Get the form element and call its submit() method (or requestSubmit()). <form id="myForm" action="/save" method="post"> <input type=... 1
- What is === operator? === is called a strict equality operator, which returns true when the two operands have the same value without conversion. 1
- What is the difference between ViewState and SessionState? Answer: ViewState stores data for one page across its postbacks, on the client side; SessionState stores data for one user across all pages,... 1
- Which symbol is used for comments in Javascript? // for Single line comments and /* Multi Line Comment */ 2