CAPF (AC) 2013 (Paper-1) (Question 1-50)

Total Questions: 50

31. Advanced sunrise and delayed sunset found in the sky are due to the phenomenon of

Correct Answer: (b) refraction of sunlight
Solution:Advanced sunrise and delayed sunset are due to sunlight refracts because it travels from the vacuum of space into Earth's atmosphere. As its font wave graze the upper atmosphere, light bends downward. And when we see a sunrise, the Sun has not yet reached the horizon; it's below it.

Atmospheric refraction creates the Sun visible even when it is just below the horizon. This effect is especially powerful for objects that appear near to horizon, such as the rising or setting of the Sun because the light rays enter the Earth's atmosphere at a specific shallow angle.

32. The formation of colours in soap bubbles is due to the phenomenon of

Correct Answer: (b) interference of light
Solution:Light waves, like water waves, can interfere with each other. When light waves reflecting from one layer of soap molecules meet up with light waves reflecting from the second layer of soap molecules, the two sets of waves interfere.

Some waves add together, making certain frequencies or colours of light brighter. Other waves cancel each other, removing a frequency of colour from the mixture. The colours that we see are what are left after the light waves interfere. They are known as interference colours.

33. Geostationary satellite completes its one revolution around the earth in

Correct Answer: (b) 24 hours
Solution:A geosynchronous satellite is located in the geosynchronous orbit with an orbital period synchronizing the Earth's rotation period. These satellites get hold of 24 hours to complete one rotation around the earth. Geosynchronous satellites can have a bent of position, the major difference to geostationary orbit is the fact that they lay on the same plane as the equator.

When a geosynchronous satellite is laid directly over the Equator with a circular orbit and angular velocity similar to that of the Earth, the satellite is known as a geostationary satellite. These satellites seem to be stationary over a specific point which is due to the synchronization. For instance, the communication satellites and weather forecasting are posed in the geosynchronous orbit.

34. What is the correct sequence of conductivity when arranged in ascending order?

Correct Answer: (d) Insulators, semi-conductors, metals
Solution:The correct sequence of conductivity is - Insulators, Semiconductors and Metals. Insulators do not have ant-free electrons in them, due to this electricity cannot pass through the insulators. So, their conductivity is the lowest. Semiconductors conductivity depends upon the temperature.

At normal temperatures, they behave as insulators. However, when temperature increases, the conductivity of the semiconductor increases. Metals have free electrons in them, which helps largely is the conduction of electricity. So, they have the highest conductivity.

35. Which one among the following statements about 'modem' is correct?

Correct Answer: (d) Modem converts the analog signal into digital signal and vice versa
Solution:A modem coverts the analogue signal into the digital one which means a modem modulates and demodulates electrical signals sent through phone lines, coaxial cables, or other types of wiring. Thus, the modem is a device that links your home, generally through a coax cable connection to your Internet Service Provider which translates them into signals your local devices can use.

36. Which one among the following is not a form of carbon?

Correct Answer: (d) Quartz
Solution:Quartz is one of the most important components of sand and granite. It consists of silica. It is a chemical compound consisting of one part silicon and two parts oxygen. It is silicon dioxide (SiO2). It is the most abundant mineral found at Earth's surface, and its unique properties make it one of the most useful natural substances.

Carbon is placed in various forms in nature. Graphene, Graphite and Fullerene are types of allotropes of carbon which is different from each other in many physical properties. Thus, option D is the correct answer.

37. Plants capable of performing photo-synthesis belong to which one among the following types of organisms?

Correct Answer: (c) Autotrophs
Solution:Plants, algae, etc. are organisms capable of performing photosynthesis. Because they use light to manufacture their own food, they are called autotrophs or photoautotrophs (literally, "self-feeders using light"). Because autotrophs produce their food, they are often called producers. Autotrophs are capable of manufacturing their food by photosynthesis. Plants, lichens, and algae are examples of autotrophs capable of photosynthesis.

38. With reference to India, which of the following statements relating to urbanization is/are correct?

1. It is a manifestation of economic, social and political progress.

2. Rapid growth of urban population puts pressure on public utilities.

3. Urban sprout is encroaching the precious agricultural land.

Select the correct answer using the code given below.

Correct Answer: (d) 1, 2 and 3
Solution:Urbanization refers to the population shift from rural to urban areas, the decrease in the proportion of people living in rural areas, and how societies adapt to this change. It is a materialization of economic, social and political progress. However, rapid growth of urban population puts pressure on public utilities. Matter of greater concern is, urbanization puts pressure on agricultural land. Cities encroach on land used for farming.

39. Which of the following statements regarding landslides is/are correct?

1. They are sudden and sporadic.

2. They result when the slope is gentle.

3. Mining activity is also responsible for landslides.

Select the correct answer using the code given below.

Correct Answer: (b) 1 and 3 only
Solution:Landslides are caused by a sudden disruption in the natural stability of a slope. They can accompany heavy rains or follow droughts earthquakes, or volcanic eruptions. Mining is human cause of landslides because of its different operations that produce a large number of vibrations, that can reach hundreds of meters beneath the soil surface and poses threat to other areas that are at the risk of sliding. Thus, option B is the correct answer.

40. Which of the following statements related to globalization is/are correct?

1. It has resulted in the change of scale in economic activities.

2. End of Cold War facilitated globalization.

3. Flow of money in transnational corporations is discouraged.

Select the correct answer using the code given below.

Correct Answer: (a) 1 and 2 only
Solution:Globalization is a term that explains the growing interdependence of the world's economies, cultures, and populations, cross-border trade in goods and services, technology, and flows of investment, people, and information.

The end of the Cold War contributed to opening up new consumer markets. The capitalist countries opened their economies to international trade. Globalization helps to flow of money from through setting up of multinational corporations.