Test : General Science - 5 - NDA MCQ

Human body has different resistances, when dry, resistance is 100,000 ohms. When wet because of sweat or water, resistance is only 1,000 ohms.

Energy ∝1/(wave length)

The energy of any of the colour is inversely proportional to its wavelength. According the VIBGYOR violet, Indigo and blue have the minimum wavelength, thus they have maximum energy level. So according to the options given in the question, blue has the maximum energy while red had the minimum energy.

The smaller units of measuring mass are Milligram, Microgram, Pikogram and Femtogram. 

1 Pikogram = (10-12) gram

Luxmeter is used to measure the intensity of light, while colorimeter is a device used to measure the intensity of colour. 

Law of Conservation of Energy means Energy can neither be created nor be destroyed, rather it can only be transformed from one form to another.

Graphene is an allotrope of Carbon in the form of a two dimensional atomic-scale hexagonal lattice in which one atom from each vertex.

Hydreliox is a mixture of oxygen, helium, and hydrogen and is used for dives below 130 metres in commercial diving.

The rubbing surface of a matchbox has powdered glass and a little red Phosphorus.

Risedronate medicine is for use when you have a high risk of bone fracture due to osteoporosis.

A Mushroom is the fleshy, spore-bearing fruiting body of a fungus.

Rainwater is purest form of water. Its pH value is 7.

Deliquescence is the process by which a substance absorbs moisture from the atmosphere until it dissolves in the absorbed water and forms a solution.

On average, seawater in the world's oceans has a salinity of approximately 3.5%, or 35 parts per thousand. This means that for every 1 litre (1000 mL) of seawater there are 35 grams of salts (mostly, but not entirely, sodium chloride) dissolved in it.

The boiling point of a liquid is the temperature at which its vapour pressure is equal to the pressure of the gas above it. Generally impurities increases the boiling point of liquid.

The life span of RBC of man is 120 days.

Cellulose is the substance that makes up most of a plant's cell walls.

The set of unpaired Chromosomes are called Haploid.

Genetic constitution of organism is called Genotype.

A dynamo is an electrical generator that produces direct current with the use of a commutator. It converts mechanical energy into electrical energy.

The transformer is used to step up and step down the alternating current. There are two types of coils in transformers (i) Primary coil (2) Secondary coil. Alternate current flows through the primary coil which inflicts the potential in the secondary coil.