General Science · NDA previous year questions

Which one of the following is the correct reactivity series with water?

1. A.Zinc > Iron > Lead > Copper
2. B.Copper > Lead > Zinc > Iron
3. C.Copper > Zinc > Iron > Lead
4. D.Zinc > Copper > Iron > Lead

To help deep-sea divers breathe, they carry cylinders of oxygen mixed with

1. A.chlorine
2. B.helium
3. C.nitrogen
4. D.ozone

Human eye can see objects at different distances with contrasting illuminations. This is due to

1. A.far-sightedness
2. B.near-sightedness
3. C.far-sightedness and nearsightedness
4. D.accommodation of eye

The digestion of fat in human intestine is performed by

1. A.Bile and Lipase
2. B.trypsin
3. C.bile and amylase
4. D.bile and pepsin

Bronze is an alloy of

1. A.Cu and Zn
2. B.Cu and Sn
3. C.Zn and Mg
4. D.Fe and Cu

The number of structural isomers of pentane is

1. A.5
2. B.4
3. C.2
4. D.3

Vapours of sulphur escaping from a volcano often form a crust on the rocks. The process involved is an example of

1. A.condensation
2. B.precipitation
3. C.deposition
4. D.evaporation

Dry ice is used on a performing stage to produce mist in air. The process involved is an example of

1. A.sublimation
2. B.evaporation
3. C.condensation
4. D.precipitation

${\mathrm{C}}_4{\mathrm{H}}_8$ belongs to the homologous series of

1. A.alkanes
2. B.alkenes
3. C.alkynes
4. D.cycloalkenes

After fertilization, the fruit and the seed are produced by

1. A.ovule and ovary, respectively
2. B.ovary and ovule, respectively
3. C.ovary, no ovule required
4. D.ovule, no ovary required

The International Union for Conservation of Nature (IUCN) has recently categorized the Red Sanders (Red Sandalwood) into

1. A.deficient category
2. B.endangered category
3. C.near-threatened category
4. D.critically endangered category

Which of the following statements about living and non-living being is/are correct? 1. While living being can demonstrate growth and repair, non-living being cannot. 2. While living being demonstrates metabolic processes, non-living being does not. Select the correct answer using the code given below.

1. A.1 only
2. B.2 only
3. C.Both 1 and 2
4. D.Neither 1 nor 2

Which one of the following belongs to 'Pisces'?

1. A.Dogfish
2. B.Jellyfish
3. C.Silverfish
4. D.Starfish

Which one of the following is not a solution?

1. A.Alloy
2. B.Milk
3. C.Air
4. D.Sugar

Refining of petroleum is carried out using which one of the following techniques?

1. A.Evaporation
2. B.Fractional distillation
3. C.Separating funnel
4. D.Sublimation

The time period of a 1 m long pendulum approximates to

1. A.6 s
2. B.4 s
3. C.2 s
4. D.1 s

Which one of the following is the mechanism of action of oral contraceptive pills?

1. A.They kill the egg.
2. B.They kill the sperm.
3. C.They kill the zygote.
4. D.They inhibit the release of egg.

Which one of the following statements with respect to Global Positioning System (GPS) is not correct?

1. A.It is based on network of satellites orbiting above the Earth.
2. B.It is based on the system of triangulation.
3. C.GPS receivers provide location in terms of latitude, longitude and altitude.
4. D.It provides information exclusively for military operations.

Which one of the following statements about biodiversity is not correct ?

1. A.The term ‘biodiversity’ was coined by Walter G. Rosen in 1986.
2. B.The term ‘biodiversity hotspots’ was coined by Norman Myers in 1988.
3. C.The regions having richest biodiversity are called ‘biodiversity hotspots’.
4. D.More than 100 hotspots of biodiversity are identified in the world.

Which one of the following tissues is known as basic packing tissue and found in xylem and phloem ?

1. A.Collenchyma
2. B.Parenchyma
3. C.Sclerenchyma
4. D.Vessels

Cinnabar is an ore of which one of the following?

1. A.Copper
2. B.Zinc
3. C.Mercury
4. D.Manganese

Myopia is a defect in human vision where an image of a

1. A.nearby object is focused beyond the retina.
2. B.nearby object is focused before the retina.
3. C.distant object is focused before the retina.
4. D.distant object is focused beyond the retina.

Twinkling of stars is primarily due to the atmospheric

1. A.refraction
2. B.reflection
3. C.polarization
4. D.dispersion

What is the total number of covalent bonds in methanol ?

1. A.3
2. B.4
3. C.5
4. D.6

Keppel Island is completely bleached mainly due to the expansion of

1. A.Starfish
2. B.Blue whale
3. C.Octopus
4. D.Sea horse