NDA/NA SOLVED PAPER 2016-I (GENERAL KNOWLEDGE)

Total Questions: 100

1. The following 05 (Five) items consist of two statements, Statement I and Statement II. Examine these two statements carefully and select the answers to these items using the code given below:

Statement I: Petroleum is a mixture of many different hydrocarbons of different densities.
Statement II: The grade of petroleum depends mainly on the relative proportion of the different hydrocarbons.

Correct Answer: (b) Both the Statements are individually true but Statement II is not the correct explanation of Statement I.
Solution:Both the statements are individually true but statement II is not the correct explanation of the statement I.

2. Examine these two statements carefully and select the answers to these items.

Statement I: There is high salinity in Red Sea.
Statement II: Rate of evaporation is high in Red Sea.

Correct Answer: (a) Both the Statements are individually true and Statement II is the correct explanation of Statement I.
Solution:Both the statements are individually true and statement II is the correct explanation of statement I. Higher the rate of evaporation, higher is salinity. The Highest evaporation has been recorded along the tropic of Cancer and that is one of the reasons that region of Red Sea and Persian Gulf has one of the highest salinity

3. Examine these two statements carefully and select the answers to these items.

Statement I: Volcanic eruption is accompanied by earthquakes.
Statement II: Volcanoes erupt water vapours and dust particles in the atmosphere.

Correct Answer: (b) Both the Statements are individually true but Statement II is not the correct explanation of Statement I.

4. Examine these two statements carefully and select the answers to these items.

Statement I: Plantation farming has mostly been practised in humid tropics.
Statement II: The soil of humid tropics is highly fertile.

Correct Answer: (c) Statement I is true but Statement II is false.
Solution:The soil of humid tropics is not highly fertile. Tropical soils are more weathered due to higher temperatures and rainfall, which can result in a depletion of nutrients. Thus, option (c) is correct because statement II is false.

5. Examine these two statements carefully and select the answers to these items.

Statement I: India has wide variation in population density.
Statement II: Factors like agricultral productivity and history of settlements have greatly influenced the population density pattern in India.

Correct Answer: (a) Both the Statements are individually true and Statement II is the correct explanation of Statement I.

6. A container is first filled with water and then the entire water is replaced by mercury. Mercury has a density of 13.6 × 10³ kg / (m³) . If X is the weight of the water and Y is the weight of the mercury, then

Correct Answer: (c) Y = 13.6X

7. Density of water is

Correct Answer: (c) maximum at 4° C
Solution:Water has its maximum density of 1 g/cm³ at 4 degrees Celsius. When the temperature changes from either greater or less than 4 degrees, the density will become less then 1 g/cm³.

8. The phosphorus used in the manufacture of safety matches is

Correct Answer: (a) Red phosphorus
Solution:Red phosphorus is used in the safety matches because it shows phosphorescence and cannot be converted to white phosphorous on heating.

9. Which one of the following is not a chemical change?

Correct Answer: (c) Freezing of water
Solution:Freezing of water is not a chemical change as ice when melt changes back to water showing physical change.

10. One of the main causes of air pollution in cities is emissions from vehicles like cars and trucks. Cars emit various pollutants which are bad for human health when inhaled, like

1. Nitrogen oxides (NOₓ)
2. Carbon monoxide (CO)
3. Carbon dioxide (CO₂).
4. Benzone

Which of the above pollutants are not tolerated by human beings even at very low levels?

Correct Answer: (d) 1, 2 and 4 only
Solution:Nitrogen oxide is one of the major pollutants emitted from cars and trucks in cities causes air pollution. Other air pollutant which are carbon monoxide and benzene.