All questions
- List some of the advantages of JavaScript. Some of the advantages of JavaScript are: Server interaction is less Feedback to the visitors is immediate Interactivity is high Interfaces... 1
- Who developed JavaScript, and what was the first name of JavaScript? JavaScript was developed by Brendan Eich, who was a Netscape programmer. Brendan Eich developed this new scripting language in just ten days... 1
- List some features of JavaScript. Some of the features of JavaScript are: Lightweight Interpreted programming language Good for the applications which are network-centric Com... 1
- Explain PHP parameterized functions. PHP parameterized functions are functions with parameters. You can pass any number of parameters inside a function. These given parameters a... 1
- What is the use of header() function in PHP? The header() function is used to send a raw HTTP header to a client. It must be called before sending the actual output. For example, you ca... 1
- How to do single and multi line comment in PHP? PHP single line comment is made in two ways: Using // (C++ style single line comment) Using # (Unix Shell style single line comment) PHP mul... 2
- What is the difference between $message and $$message? $message stores variable data while $$message is used to store variable of variables. $message stores fixed data whereas the data stored in... 2
- What is the difference between "echo" and "print" in PHP? Echo can output one or more string but print can only output one string and always returns 1. Echo is faster than print because it does not... 1
- What is "print" in PHP? PHP print output a string. It is a language construct not a function. So the use of parentheses is not required with the argument list. Unli... 1
- What is "echo" in PHP? PHP echo output one or more string. It is a language construct not a function. So the use of parentheses is not required. But if you want to... 2
- What are the popular Content Management Systems (CMS) in PHP? WordPress: WordPress is a free and open-source content management system (CMS) based on PHP & MySQL. It includes a plug-in architecture and... 1
- What is PEAR in PHP? PEAR is a framework and repository for reusable PHP components. PEAR stands for PHP Extension and Application Repository. It contains all ty... 1
- Explain how pressure of a dry gas can be calculated using aqueous tension. i. When a gas is collected over water in a closed container, it gets mixed with the saturated water vapour in that space. Therefore, the mea... 1
- A gas at 772 mm Hg and at 35 °C occupies a volume of 6.851 L. Calculate its volume at STP. Given: V₁ = Initial volume = 6.851 L P₁ = Initial pressure = 772 mm Hg, P₂ = Final pressure = 760 mm Hg T₁ = Initial temperature = 35 °C = 3... 1
- Find the temperature in °C at which volume and pressure of 1 mol of nitrogen gas becomes 10 dm3 and 2.46 P = 2.46 atm, V = 10 dm³, n = 1 mol, R = 0.0821 dm³-atm K⁻¹ mol⁻¹ To find: Temperature (T) Formula: PV = nRT According to ideal gas equation... 1
- Calculate the temperature of 5.0 mol of a gas occupying 5 dm3 at 3.32 bar. (R = 0.083 bar dm3 K-1 mol-1) Given: n = number of moles = 5.0 mol, V = volume = 5 dm³ P = pressure = 3.32 bar, R = 0.083 bar dm³ K⁻¹ mol⁻¹ To find: Temperature (T) Formu... 1
- Calculate the number of moles of hydrogen gas present in a 0.5 dm3 sample of hydrogen gas at a pressure Given: V = 0.5 dm³ = 0.5 × 10⁻³ m³, P = 101.325 kPa = 101.325 × 10³ Pa = 101.325 × 10³ Nm⁻² T = 27 °C = 27 + 273.15 K = 300.15 K, R = 8.314... 1
- What is an ideal gas? The gases which obey’ ideal gas equation over a complete range of temperature and pressure are called ideal gases. For an ideal gas, the rat... 1
- What are real gases? Gases, which do not obey ideal gas equation under all the conditions of temperature and pressure are called real gases. For real gases, the... 1
- Explain the reason for deviations of gases from ideal behaviour. A deviation from the ideal behaviour is observed at high pressure and low temperature. It is due to two reasons. The intermolecular attracti... 1
- Explain: Liquefaction of CO2 with the help of pressure vs volume isotherm. Answer: Andrews' P–V isotherms of CO₂ show that CO₂ can be liquefied by pressure only below its critical temperature, 30.98 °C; at this temp... 1
- Define: Critical temperature, critical volume and critical pressure. i. The temperature above which a substance cannot be liquified by increasing pressure is called its critical temperature (T_c). ii. The mola... 1
- Water has Tc = 647.1 K and Pc = 220.6 bar. What do these values imply about the state of water under ordinary conditions The T_c and P_c values of water are very high compared to the room temperature and common atmospheric pressure. As a result, water exists in... 1
- Gases possess characteristic critical temperature which depends upon the magnitude of intermolecular forces When cooling of ammonia and carbon dioxide gas is started from 500 K, then ammonia reaches its critical temperature first (i.e., 405.5 K.) a... 1