Science, Technology, and Programming Concepts Quiz

The goto keyword exists and is functional in both C and Java languages. While discouraged in modern programming due to concerns about code readability and maintainability, it remains a reserved keyword that can be used to transfer control within a function.

Java removes direct pointer manipulation and pointer arithmetic from C, as memory management is handled by the JVM. Concepts like pointers, dereferencing operators (*, &), and manual memory allocation (malloc, free) don't exist in Java, reducing complexity and common memory-related errors.

++i is pre-increment (increments first, then returns new value), so i becomes 2 and prints 2. i++ is post-increment (returns current value, then increments), so it prints 2 again (current value) then increments to 3. Output: 2,2. Note: void main() is non-standard but works in some compilers.

The do-while loop is the only looping construct that guarantees execution of its body at least once, because the condition is checked after the first iteration. While and for loops check the condition before entering, so they may execute zero times.

In Java, this() is used to call one constructor from another constructor in the same class. It must be the first statement in the constructor body. 'this' alone refers to the current object instance, while 'super' and 'super()' are used for parent class references and constructors respectively.

J.J. Thomson discovered the electron in 1897 through his groundbreaking cathode ray tube experiments at Cambridge University. He showed that cathode rays were negatively charged particles much smaller than atoms, which he called 'corpuscles' (later named electrons). This discovery revolutionized our understanding of atomic structure.

Tantalum has the highest boiling point (approximately 5,458°C or 9,856°F) among the given options. This refractory metal is extremely heat-resistant, making it valuable for high-temperature applications like jet engine components and nuclear reactors. Diamond is not an element but pure carbon, platinum melts at a lower temperature, and titanium also has a lower boiling point.

Apples belong to the Rosaceae family, commonly known as the rose family. This large plant family includes not only roses but also many other fruits like pears, cherries, peaches, plums, strawberries, and almonds. The family name Rosaceae comes from the type genus Rosa (roses), which apples are botanically related to.

A manometer is an instrument used to measure pressure, particularly gas or liquid pressure. Saccharimeter measures sugar concentration, ammeter measures electric current, and lactometer measures milk purity. Manometers are essential in various scientific and industrial applications.

A light year is a unit of distance, not time or speed. It represents the distance light travels in one vacuum year (about 9.46 trillion kilometers). Astronomers use it to measure vast interstellar and intergalactic distances.

The joule is the SI unit of energy, defined as the work done when a force of one newton moves an object one meter in the direction of the force. It is used for all forms of energy including kinetic, potential, thermal, and electrical energy.

One gram weight (gram-force) equals 981 dynes under standard gravity (g = 981 cm/s²). The dyne is the CGS unit of force. This conversion is based on the relationship: 1 gram-force = g × 1 gram = 981 cm/s² × 1 g = 981 g·cm/s² = 981 dynes.

One joule equals 10^7 ergs. The erg is the CGS unit of energy, while the joule is the SI unit. Since 1 joule = 1 newton × 1 meter = 10^5 dynes × 100 cm = 10^7 dyne·cm = 10^7 ergs. The option '107' represents 10^7.

The ampere is the SI unit of electric current, representing one coulomb of charge per second. Ohm measures resistance, watt measures power, and volt measures potential difference. The ampere is one of the seven base SI units.

In the MKS (meter-kilogram-second) system, the standard unit of energy is the Joule. Volt measures electric potential difference, Erg is the energy unit in the CGS system, and Ohm measures electrical resistance.

A seismograph measures earthquake intensity and records seismic waves. Barometers measure atmospheric pressure, hydrometers measure liquid density, and polygraphs detect physiological responses during questioning.