General Science · NDA previous year questions

A Kelvin thermometer and a Fahrenheit thermometer both give the same reading for a certain sample. What would be the corresponding reading in a Celsius thermometer?

1. A.574
2. B.301
3. C.273
4. D.232

Glass is a

1. A.liquid
2. B.colloid
3. C.non-crystalline amorphous solid
4. D.crystalline solid

Sugarcane is one of the important cash crops in India. It is grown to obtain

1. A.Starch
2. B.Glucose
3. C.Fructose
4. D.Sucrose

A person is unable to read a newspaper without his glasses. He is most probably suffering from

1. A.myopia
2. B.presbyopia
3. C.astigmatism
4. D.hypermetropia

When one strikes a safety match, the first step is

1. A.burning of sulfur
2. B.decomposition of potassium chlorate into potassium chloride and oxygen
3. C.conversion of a small amount of red phosphorus into white phosphorus
4. D.burning of glue and starch

Combination of one volume of nitrogen with three volumes of hydrogen produces

1. A.one volume of ammonia
2. B.two volumes of ammonia
3. C.three volumes of ammonia
4. D.one and a half volumes of ammonia

Emulsion is known as a

1. A.colloidal solution of substances having different physical states
2. B.true solution
3. C.distillation mixture for making alcohols
4. D.colloidal solution of two liquids

Statement II : Ozone is concentrated mainly in stratosphere.

1. A.Both the statements are individually true and Statement II is the correct explanation of Statement I
2. B.Both the statements are individually true but Statement II is not the correct explanation of Statement I
3. C.Statement I is true but Statement II is false
4. D.Statement I is false but Statement II is true

With reference to biodiversity, which of the following statements is/are correct? 1. Species richness and high degree of endemism are important criteria for identifying biodiversity hot spots. 2. Species diversity is highest in the tropics and decreases down the poles. 3. Biodiversity conservation may be in situ as well as ex situ. Select the correct answer using the code given below :

1. A.1 only
2. B.2 and 3 only
3. C.1, 2 and 3
4. D.1 and 3 only

A man weighing 70 kg is coming down in a lift. If the cable of the lift breaks suddenly, the weight of the man would become

1. A.70 kg
2. B.35 kg
3. C.140 kg
4. D.Zero

A container is first filled with water and then the entire water is replaced by mercury. Mercury has a density of $13.6\times 10^{3}kg/{\mathrm{m}}^3$. If X is the weight of the water and Y is the weight of the mercury, then

1. A.$X=Y$
2. B.$X=13.6Y$
3. C.$Y=13.6X$
4. D.None of the above

A glass vessel is filled with water to the rim and a lid is fixed to it tightly. Then it is left inside a freezer for hours. What is expected to happen ?

1. A.The water freezes to ice and the level of ice comes down
2. B.The water in the glass vessel simply freezes to ice
3. C.The glass vessel breaks due to expansion as water freezes to ice
4. D.The water does not freeze at all

Density of water is

1. A.maximum at 0°C
2. B.minimum at 0°C
3. C.maximum at 4°C
4. D.minimum at –4°C

The phosphorus used in the manufacture of safety matches is

1. A.Red phosphorus
2. B.Black phosphorus
3. C.White phosphorus
4. D.Scarlet phosphorus

What is the number of mole(s) of ${\mathrm{H}}_2(\mathrm{g})$ required to saturate one mole benzene?

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

Consider the following statements : 1. All Echinoderms are not marine. 2. Sponges are exclusively marine. 3. Insects are found in all kinds of habitats. 4. Many primates are arboreal. Which of the statements given above is/are correct ?

1. A.1, 3 and 4 only
2. B.3 and 4 only
3. C.2 and 4 only
4. D.3 only

Which of the following statements are correct ? In honey bees 1. Males are haploid. 2. Workers are sterile and diploid. 3. Queen develops from diploid larvae that fed on royal jelly. 4. Honey is collected/made by males. Select the correct answer using the code given below :

1. A.1, 2, 3 and 4
2. B.2 and 3 only
3. C.1, 2 and 3 only
4. D.1 and 4 only

Which of the following substances are harmful for health if present in food items? 1. Pesticide residues 2. Lead 3. Metanil yellow 4. Mercury Select the correct answer using the code given below:

1. A.1 and 2 only
2. B.1, 2 and 4 only
3. C.3 and 4 only
4. D.1, 2, 3 and 4

Which of the commonly used household item(s) release Bisphenol A (BPA) which is an endocrine disruptor and bad for human health? 1. Steel utensils 2. Plastic coffee mugs 3. Aluminium utensils 4. Plastic water storage bottles Select the correct answer using the code given below:

1. A.1 only
2. B.1 and 2 only
3. C.2 and 4 only
4. D.1, 2 and 3 only

Which one of the following is the SI unit of the thermal conductivity of a material?

1. A.$\mathrm{W}{\mathrm{m}}^{-1}{\mathrm{K}}^{-1}$
2. B.$Wm/K$
3. C.$\mathrm{W}{\mathrm{m}}^{-1}/{\mathrm{K}}^{-1}$
4. D.$\mathrm{J}{\mathrm{s}}^{-1}{\mathrm{m}}^{-1}\mathrm{K}$

Ammonia (${\text{NH}}_3$) obtained from different sources always has same proportion of Nitrogen and Hydrogen. It proves the validity of law of:

1. A.Reciprocal proportion
2. B.Constant proportion
3. C.Multiple proportions
4. D.None of the above

Who among the following discovered the antibiotic producing fungus from Penicillium genus?

1. A.Louis Pasteur
2. B.Sir Alexander Fleming
3. C.Stanley Prusiner
4. D.Robert Hooke

Optical glass used in the construction of spectacles is made by

1. A.flint glass
2. B.Crookes glass
3. C.quartz glass
4. D.hard glass

The densities of three liquids are $D,2D$ and $3D$. What will be the density of the resulting mixture if equal volumes of the three liquids are mixed?

1. A.$6D$
2. B.$1.4D$
3. C.$2D$
4. D.$3D$

Which one among the following contains the most neutrons?

1. A.${}_{26}^{59}\mathrm{Fe}$
2. B.${}_{29}^{61}\mathrm{Cu}$
3. C.${}_{30}^{61}\mathrm{Zn}$
4. D.${}_{30}^{60}\mathrm{Z}{\mathrm{n}}^{2+}$