Test : General Science - 2 - NDA MCQ

Telephone exchange was invented by Tivadar Puskas.

Two Positive charges will repel to each other so the force will decrease between two positive charge.

A Seismometer is an instrument that measures motion of the ground, caused by, for example, an earthquake, a volcanic eruption, or the use of explosives.

Nylon is an artificial fibre. It has high tensile strength, stiffness, excellent heat deflection temperature, and superior abrasion and wear resistance. Nylon thread is actually stronger than a steel wire.

Electroplating is the process of plating(depositing) one metal onto another by means of electricity, most commonly for decorative purposes or to prevent corrosion of a metal.

In the convection process, heat is transferred in the liquid and gases from a region of higher temperature to a region of lower temperature. Convection heat transfer occurs partly due to the actual movement of molecules or due to the mass transfer.
 

Silver react with Hydrogen Sulphide in air to form Silver Sulphide. This is corrosion of silver.

Pulses are  rich sources of  proteins.

The plant cell wall is composed of cellulose. Cellulose is a structural carbohydrate and is considered a complex sugar because it is used in both protection and structure.

Mycology is the branch of biology concerned with the study of fungi, including their genetic and biochemical properties, their taxonomy and their use to humans.
 

At -40 degrees, the numerical values on Celsius and Fahrenheit scales become equal.

Sublimation is the phase transition of a substance directly from the solid to the without passing through the intermediate liquid phase.

When a ball is thrown vertically upwards Acceleration due to gravity remains constant during its motion.

Heat is the amount of energy that flows spontaneously from a warmer object to a cooler one. In SI system, heat energy is measured in joules (J).

Galvanisation is the process of applying a protective zinc coating to iron or steel, to prevent rusting. The most common method is hot dip galvanizing, in which steel sections are submerged in a bath of molten zinc.

Dry ice, sometimes referred to as "cardice", is the solid form of carbon dioxide. It is used primarily as a cooling agent. Its advantages include lower temperature than that of water ice and not leaving any residue. It is useful for preserving frozen foods where mechanical cooling is unavailable.

Pitchblende is a radioactive, uranium-rich mineral and ore. It has a chemical composition that is largely UO2, but also contains UO3 and oxides of lead, thorium, and rare earth elements. It is known as pitch blende due to its black color and high density.

Spiders belong to the class of Arachnids.

Lipase is an enzyme in the body uses to break down fats in food so they can be absorbed in the intestines. Lipase is produced in the pancreas, mouth, and stomach.

The pattern of arrangement of leaves on the stem is called Phyllotaxy. As a stem grows at its apex, new leaf buds form along the stem by a highly controlled developmental process.