CAPF (AC) 2018 (Paper-1) (Question 51-100)

Total Questions: 50

1. Which of the following statements about tropical cyclone are correct?

1. It originates the develops over warm oceanic surface.

2. Presence of Coriolis force is necessary for it.

3. It occurs in middle latitudinal region.

4. It develops 'eye' with calm and descending air condition.

Select the correct answer using the code given below.

(a) 1 and 2 only
(b) 1, 2 and 4
(c) 3 and 4 only
(d) 2, 3 and 4

Correct Answer: (b) 1, 2 and 4

Solution:Tropical cyclones are violent storms that originate and intensify over warm tropical oceans. They develop in the region between the Tropics of Capricorn and Tropic of Cancer. They are warm because they flow only over warm ocean waters near the equator. The winds blow counter clockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere. The eye is an area with calm weather descending air. Therefore, the correct option is (b).

2. Which of the following statements about biodiversity hot spots is/are correct?

1. Biodiversity hot spots are identified by the International Union for Conservation of Nature and Natural Resources (IUCN).

2. Biodiversity hot spots are defined according to their vegetation.

3. In India, Eastern Ghat's and Western Himalaya are the biodiversity hot spots.

Select the correct answer using the code given below.

(a) 1 and 2 only
(b) 3 only
(c) 1, 2 and 3
(d) 1 only

Correct Answer: (a) 1 and 2 only

Solution:The term biodiversity is defined as the total diversity at all levels of biological organisation. The hotspots of biodiversity are not only defined by their vegetation. It is defined as a bio geographic region with significant levels of biodiversity that is threatened by human habitation. It consists of three components; genetic diversity, species diversity and ecological diversity. The International Union for Conservation of Nature and Natural Resources (IUCN) define hotspots. In India, the Western Ghats and the Eastern Himalayas are identified as hotspots. Therefore, the correct option is (a).

3. Which one of the following is not an igneous rock?

(a) Granite
(b) Gneiss
(c) Pumice
(d) Basalt

Correct Answer: (b) Gneiss

Solution:Gneiss is a type of metamorphic rock that is formed due to exposure to extreme temperatures and pressure.

They have a characteristic feature by their arrangement of minerals into long bands. Graphite is a naturally occurring form of crystalline carbon. Pumice is a pyroclastic igneous rock that was almost completely liquid at the moment of effusion and does not get crystallised as gets cool down in no time. Basalt is the most common, hard, black volcanic rockin the Earth's crust. Therefore, the correct option is (a).

4. Which one of the following rivers is west-flowing?

(a) Godavari
(b) Periyar
(c) Tungabhadra
(d) Cauvery

Correct Answer: (b) Periyar

Solution:Periyar river is popularly known as the lifeline of Kerala. It is named so as it provides water to the state of Kerala. It is the longest river in Kerala. Its origin is high in the Western Ghats. It flows entirely through the state and joins the Arabian Sea in Kerala. It helps in the generation of electricity in the state of Kerala through the Idukki Dam. It flows along a region of industrial and commercial activity. Therefore, the correct option is (a).

5. Consider an equilateral triangle ABC as given in the following diagram:

Two people start at the same time from points A and B with speeds 30 km per hour and 20 km per hour respectively, and move on the sides of the triangle in the clockwise direction. They meet each other for the first time at

(a) point C
(b) a point between C and A
(c) a point between A and B
(d) point A

Correct Answer: (d) point A

Solution:

Let the sides of equilateral triangle are 60 km.

Speed of A = 30 km/h

Speed of B = 20 km/h

When, they move in same direction.

Then, difference of speed = 30 - 20 = 10 km/h

So, A will cover the difference of distance (60 km) in 6 hrs

∴ In 6 hrs B will be on point A.

Hence, they meet each other for first time at point 'A'.

6. The number of ways in which 3 boys and 2 girls can be arranged in a queue, given that the 2 girls have to be next to each other, is

(a) 12
(b) 24
(c) 48
(d) 120

Correct Answer: (c) 48

Solution:Arrangement of boys and girls, when two girls have to be next to each other then two girls can be next in 2 ways = 2 × 1 ways = 2 ways

Consider two girls are as a single person then 3 boys and 2 girls can be next to each other in ⌊4 × 2 ways

So, total number of ways = 4 × 3 × 2 × 2 = 48 ways

7. The ratio of ages of a man and his son is 3 : 1. After 15 years, the age ratio will be 2 : 1. What is the age of the man?

(a) 45 years
(b) 40 years
(c) 35 years
(d) 30 years

Correct Answer: (a) 45 years

Solution:Ratio of ages of man and his son = 3 : 1

Let the age of man is 3x and age of his son = x

According to the question,

(3x + 15)/(x + 15) = 2/1

⇒ 3x + 15 = 2x + 30

⇒ x = 15

∴ Age of man = 3 × 15 = 45 years.

8. Two pillars are placed vertically 8 feet apart. The height difference of the two pillars is 6 feet. The two ends of a rope of length 15 feet are tied to the tips of the two pillars. The portion of the length of the taller pillar that can be brought in contact with the rope without detaching the rope from the pillars is

(a) less than 6 feet
(b) more than 6 feet but less than 7 feet
(c) more than 7 feet but less than 8 feet
(d) more than 8 feet

Correct Answer: (b) more than 6 feet but less than 7 feet

Solution:The height difference of the two pillars = 6 feet

Length of rope = 15 feet

Calculation:

AB and CE are two pillars

AFE is a rope

Let the length of rope that's connected with taller piller be X

In a ΔAFD,

AF = 15 - x

FD = 6 - x

AD = BC = 8

AF² = FD² + AD²

⇒ (15 - x)² = (6 - x)² + 82

⇒ 225 + x² - 30x = 36 + x² - 12x + 64

⇒ 18x = 125

⇒ x = 6.94

∴ the length of rope that's connected with taller piller is more than 6 feet but less than 7 feet.

9. The following eight (8) items consist of two statements, Statement I and Statement II. Examine these two statements carefully and select the correct answer using the code given below. (Question 59 to 66)

Statement I : Sound waves can travel through vacuum.

Statement II: Light is an electromagnetic wave and can travel through vacuum.

(a) Both the statements are individually true and Statement II is the correct explanation of Statement I
(b) Both the statements are individually true but Statement II is not the correct explanation of Statement I
(c) Statement I is true but Statement II is false
(d) Statement I is false but Statement II is true

Correct Answer: (d) Statement I is false but Statement II is true

Solution:Sound waves need a medium to travel through. The particles of the medium vibrate parallel to the direction of wave travel while moving. It does not travel through a vacuum as there are no particles to carry the vibrations. The vibrations can travel through all the states of matter, i.e., solid, liquid or gas. Classical waves transfer energy without transporting matter through the medium. Light is an electromagnetic wave as they create oscillating electric and magnetic fields around it. They can travel vacuum. Therefore, the correct option is (d).

10. .

Statement I: A compass needle placed near a current-carrying wire will get deflected.

Statement II: A current-carrying wire creates magnetic field around it.

(a) Both the statements are individually true and Statement II is the correct explanation of Statement I
(b) Both the statements are individually true but Statement II is not the correct explanation of Statement I
(c) Statement I is true but Statement II is false
(d) Statement I is false but Statement II is true

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

Solution:A compass needle placed near a current-carrying wire will get deflected. A current-carrying wire creates magnetic around it. An increase in the conductor leads to an increase in deflection of the compass needle. It occurs due to the strength of the magnetic field, and it changes direction with the change in the magnitude of the electric current or the current passing through the wire. Therefore, the correct option is (a).

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