CAPF (AC) 2021 (Paper-1) (Question 51-100)

Total Questions: 50

1. In a stock clearance sale, a shopkeeper givers 40% off on all his items. He incurs a loss of 25% by selling an item of marked price ₹ 2,000. Which one of the

(a) ₹1,800
(b) ₹1,200
(c) ₹1,600
(d) ₹1,400

Correct Answer: (c) ₹1,600

Solution:MP of the item = 2,000

After discount, S.P. of the item

= 2000 × 60/100 = ₹1200

Let C.P. of the item is x.

According to the question,

x × 75/100 =1200 ⇒ x = (1200 × 100)/75 = ₹ 1600

So, C.P. of the item is 1600.

2. The average age of Raj and his father is 45 years. If the ages of the father and the grandfather of Raj are respectively two and three times that of Raj, then the age of Raj's grandfather is

(a) 75 years
(b) 90 years
(c) 81 years
(d) 84 years

Correct Answer: (b) 90 years

Solution:Let age of Raj is x years.

∴ Age of his father is 2x and age of his grand father is 3x.

Average age of Raj and his Father = 45 years.

Sum of age of Raj and his father

= 45 × 2 = 90 years.

⇒ x + 2x = 90

⇒ 3x = 90

⇒ x = 30 years

Age of Raj's grand father = 3x

= 3 × 30 = 90 years.

3. The smallest number which when added to 10000 becomes divisible by 20, 24 and 30 is

(a) 120
(b) 800
(c) 80
(d) 83

Correct Answer: (c) 80

Solution:

Remainder is 40.

So, the number which will be added to 1000, to make it divisible by 20, 24, and 30 is

⇒ 120 - 40 = 80

4. Suppose the nth term of a series is 1 + n²/2 + n/2 If there are 20 terms in the series, then the sum of the series is equal to

(a) 1360
(b) 1450
(c) 1500
(d) 1560

Correct Answer: (d) 1560

Solution:

5. How many different words, with or without meaning, can be formed by using the letters of the word COVID?

(a) 60
(b) 150
(c) 100
(d) 120

Correct Answer: (d) 120

Solution:Number of letters in the word 'COVID' = 5

Words can be formed with or without meaning

= 5 = 5 × 4 × 3 × 2 × 1 = 120 .

6. The widespread deaths due to starvation and epidemics are th characteristics of

(a) famine
(b) poverty
(c) civil war
(d) malnutrition

Correct Answer: (a) famine

Solution:A famine is characterized by widespread deaths due to starvation and epidemics caused by forced use of contaminated water or decaying food and loss by body resistance due to weakening from starvation.

7. The price declared by the Government every year before the sowing season to provide incentives to the farmers is called

(a) buffer price
(b) issue price
(c) minimum support price
(d) fair sustenance price

Correct Answer: (c) minimum support price

Solution:The MSP is a minimum price guarantee that acts as a safety net or insurance for farmers when they sell particular crops. These crops are procured by government agencies at a promised price to farmers and the MSP cannot be altered in any given situation.

The concept of MSP, therefore, protects the farmers in the country in situations where crop prices fall drastically. Wheat and rice are among the top crops that are procured by the government at MSP from the country's farmers. A total of 22-23 crops are procured under MSP.

8. Caves, arches, Stacks and Stumps are the landscape features of which one of the following?

(a) River
(b) Wave
(c) Limestone
(d) Wind

Correct Answer: (b) Wave

Solution:These features are formed on cliffs or headlands. Waves attack vertical lines of weakness in the rock known as Faults. Processes such as hydraulic action and abrasion widen these faults into cracks and eventually the waves will penetrate deeply enough to create caves.
If the cave is formed in a headland, it may eventually break through to the other side forming an arch.

The arch will gradually become bigger until it can no longer support the top of the arch. When the arch collapses, it leaves the headland on one side and a stack (a tall column of rock) on the other.
The stack will be attacked at the base in the same way that a wave-cut notch is formed. This weakens the structure and it will eventually collapse to form a stump.

9. Which of the following statements about tropical rain forests are correct?

1. The soils of tropical rain forests are quite infertile.

2. The vegetation is evergreen, enabling photosynthesis to take place year around.

3. They have been described as 'deserts covered by trees'.

4. They are most productive land-based ecosystem.

Select the correct answer using the code given below.

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

Correct Answer: (d) 1, 2, 3 and 4

Solution:As organic materials decays, it gets recycled so quickly that only few nutrients reach the soil leaving nearly sterile. 2/3 of all the plant species can be found in tropical rainforest. High amount of rainfall and consistent temperatures in these regions allow for continuous plant growth.

Despite the abundance of vegetation, the competition for resources in this ecosystem can be intense, leading to limited availability of nutrients and sunlight in certain areas. These forests have a high level of biodiversity and support a wide range of plant and animal species, making them highly productive in terms of biomass and ecological functions.

10. In which one of the following soils, the salt content is so lights that common salt is obtained by evaporating the saline water in some areas?

(a) Peaty soil
(b) Alluvial soil
(c) Laterite soil
(d) Arid soil

Correct Answer: (d) Arid soil

Solution:Arid soils have surface horizons with several unique characteristics. Arid soil can be classified as a group of soils belonging to the aridisol order of USDA classification. Some important features of arid soil are:

The soil red and brown in colour.
It is sandy in texture.
It is saline in nature and lacks humus and moisture.
Arid soils contain a substantial amount of soluble salts.
It is alkaline in nature because there is no rain to wash soluble salts.
These soils are very infertile in nature.
Arid soils are most characterized by their water deficiencies.
It contains high levels of gypsum, calcium carbonates, sodium.

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