Basic Science And Engineering : Practice Questions and Answers

Section 66C of the Information Technology Act, 2000 deals with punishment for identity theft. The IT Act is the primary law in India dealing with cybercrime and electronic commerce. It has 13 chapters and 90 sections.

The Costa Rican approach in the area of public health refers to not having an army to maintain, so that the country can spend more on public health. Costa Rica is a Central American country that gives priority to the health of its people and saves money by not possessing any army, using those funds for public health instead.

Parallel. Orthographic projection is a parallel projection technique in which the parallel lines of sight are perpendicular to the projection plane. Unlike perspective projection where the observer is at a finite distance, in orthographic projection the observer is at infinity, making all projection lines parallel to each other.

Conducting regular safety inspections. The best and most reliable way to identify workplace hazards is to perform regular safety inspections. These help in detecting unsafe conditions before they cause harm, checking machines and tools for risks, ensuring safety standards are followed, and preventing accidents rather than reacting to them.

0.1 cm. We know that 1 m = 100 cm = 1000 mm. Therefore 1 mm = 100/1000 cm = 0.1 cm.

A digital signature is a cryptographic mechanism that acts as a virtual fingerprint, uniquely identifying the sender and ensuring the content has not been tampered with during transmission. It confirms the sender's identity and guarantees data integrity — making it an essential tool in secure electronic communication.

Only statement 1 is true. Geometric shapes are indeed defined as enclosed figures formed by connecting points, lines, or curves, and they can be squares, circles, triangles, and more. Statement 2 is false because geometric shapes are not open-ended — they are enclosed.

The atmosphere is divided into five layers from Earth's surface upwards: Troposphere (0–18 km) — where all weather changes occur; Stratosphere (18–50 km) — contains the ozone layer; Mesosphere (50–85 km) — temperature drops to about -95°C; Thermosphere (85–500 km) — includes the ionosphere, helps in radio transmission; Exosphere (500–1600 km) — uppermost layer. Note: The Ionosphere is a part of the Thermosphere, not a separate layer above the Mesosphere.

4.8 g/cm³. Density = Mass / Volume = 5.74 / 1.2 = 4.7833... g/cm³.

Aluminium heats up quickly and evenly, which helps in faster cooking. That is why pressure cookers, pans, and utensils are commonly made of aluminium. It is lightweight, cheap, and a very good conductor of heat.

50%. Efficiency = Useful work output / Work input. Load = 1 kN = 1000 N, load displacement = 100 mm = 0.1 m, effort = 40 N, effort displacement = 5 m.

Laboratory thermometer. Laboratory thermometers work on the principle of thermal expansion. A liquid (usually mercury or alcohol) is contained within a narrow capillary tube.