CAPF (AC) 2015 (Paper-1) (Question 101-125)

Total Questions: 25

1. Ozone layer depletion is a major phenomenon in :

Correct Answer: (b) Stratosphere
Solution:In the stratosphere, when chlorine and bromine atoms come into contact with ozone, they destroy ozone molecules. One chlorine atom can destroy over 100,000 ozone molecules before it is removed from the stratosphere. Ozone can be destroyed more quickly than it is naturally created.

Ozone layer depletion is the process in which the reduction of the amount of ozone in the stratosphere takes place. The depletion begins when CFCs get into the stratosphere where Ultra Violet radiation from the sun breaks up these CFCs. Therefore, option (b) is correct.

2. 29th February of the year 2000 was Tuesday. After this date how many time 29th February falls on Tuesday in the whole century?

Correct Answer: (a) 3
Solution:Number of days from one leap year to another leap year = (365x4) + 1 = 1461

Number of weeks in 1461 days = 1461/7 , remainder 5, so each leap day will fall 5 days after the previous one (5 days after Tuesday).

Since, 5 is not a factor of 7, it will take 7 leap year's (7 × 4) = 28 ordinary years for repetition of Tuesday on 29th February. So, from 2000 to 2100 there will fall Tuesday on 29th February.

3. How many numbers from 1 to 1000 are there which are NOT divisible by any of the digits 2, 3 and 5?

Correct Answer: (b) 266
Solution:(1 to 1000) numbers divisible by 2 = 1000/2 = 500

(1 to 1000) numbers divisible by 3 = 1000/3 = 333

(1 to 1000) numbers divisible by 5 = 1000/5 = 200

(1 to 1000) numbers divisible by 6 = 1000/6 = 166

(1 to 1000) numbers divisible by 15 = 1000/15 = 66

(1 to 1000) numbers divisible by 10 = 1000/10 = 100

(1 to 1000) numbers divisible by 30 = 1000/30 = 33

Numbers from (1 to 1000) which are not divisible by any of the digits

= 100 - [(500 + 333 + 200) - (166 + 66 + 100) + 33]

= 1000 - [(1033) - 332 + 33] = 1000 - 734 = 266 .

4. Which one among the following plains is associated with Limestone Topography?

Correct Answer: (c) Karst plain
Solution:Karst is a term used to describe landscapes that are formed by a chemical weathering process controlled by groundwater activity. It is a distinct landform shaped largely by the dissolving action of water on carbonate rock such as limestone, dolomite and marble Karst landscapes are predominantly composed of limestone rock that contains more than 70% calcium carbonate. It is characterized by underground drainage systems with sinkholes, caves, etc. Therefore, option (c) is correct.

5. Regur soil is most suitable for the cultivation of :

Correct Answer: (b) Cotton
Solution:The regur soil is also known as black soil. They are the typical soils developed on the basaltic rocks of the Deccan plateau. This soil is rich in iron, lime and aluminium content. It has also high moisture retentive capacity.

Such type of soil is ideal for growing cotton. They are rich in soil nutrients, such as calcium carbonate, and lime. These soils are generally poor in phosphoric contents. Such type of soil is suitable for growing cotton, wheat, and several kinds of vegetables and citrus fruits. Therefore, option (b) is correct.

6. The hydrogen atoms present in acetylene molecule are :

Correct Answer: (a) acidic
Solution:Acetylene is a chemical compound composed of two carbon and two hydrogen atoms. It is the chemical compound with the formula C₂H₂. It is a hydrocarbon and the simplest Alkyne. It is a colourless gas. It is slightly soluble in water. It is used as a fuel and a chemical building block.

It contains a triple carbon-carbon bond. The acidic nature of H-atoms present at the end of the triple bonded carbon atom is due to the higher electronegativity of the SP-hybridised carbon. Therefore, option (a) is correct.

7. Which one of the following compounds is NOT considered an acid?

Correct Answer: (c) NH₃
Solution:Ammonia, NH,, is a Lewis base and has a lone pair. It will donate electrons to compounds that will accept them. NH, is a base because this nitrogen has a lone pair that is capable of accepting a proton. (The Bronsted definition of a base is a substance that accepts a proton.) NH4+ does not have a lone pair on the nitrogen and thus it cannot accept a proton, it can only donate one. Therefore, option (c) is correct.

8. Which one among the following is the correct order of west flowing rivers in terms of decreasing size of their river basins?

Correct Answer: (d) Narmada-Tapi-Mahi-Sabarmati
Solution:The basin area of the Narmada river is 98,796 km². Madhya Pradesh, Maharashtra, Gujarat. The basin area of the Tapi river is 62,225 km². It flows in the states of Madhya Pradesh, Maharashtra, Gujarat. The basin area of the Mahi river is 35,000 km². It flows in the states of Madhya Pradesh, Rajasthan, Gujarat.

The basin area of the Sabarmati river is 30,680 km². It flows in the states of Rajasthan and Gujarat. The correct order is Narmada -Tapi - Mahi-Sabarmati. Therefore, option (d) is correct.

9. Which one among the following States is the leading producer of petroleum (crude) in India?

Correct Answer: (c) Maharashtra
Solution:Petroleum also known as crude oil and oil is a naturally occurring, yellowish-black liquid found in geological formations beneath the Earth's surface. It is commonly refined into various types of fuels. Maharatna ONGC is the largest crude oil and natural gas company in India, contributing around 71 per cent to Indian domestic production.

It is situated about 161 km north of the Bombay coast in Mumbai, Maharashtra. It is an offshore field. It produces about 38% of our domestic production or 14% of India requirements. Therefore, option (c) is correct.

10. Which one among the following States is the leading producer of salt in India?

Correct Answer: (b) Gujarat
Solution:The largest salt producer state of India is Gujarat. It is the third-largest in the world. The state contributes 76% to the total salt production in India, Kharaghoda, Bhavnagar, Porbandar and Rann of Kutch of Gujarat are the major salt produced districts. Gujarat lies in a sub tropical high-pressure zone towards west India.

It is characterized by semi-arid & arid conditions. The coastal zone of the state remains dry during most of the year. Hence, salt production is high. Therefore, option (b) is correct.