CAPF (AC) 2023 (Paper-1) (Questions 1-50)

Total Questions: 50

31. Biogas is considered to be an excellent fuel which burns without smoke. The main constituent of biogas is:

(a) methane
(b) hydrogen
(c) carbon dioxide
(d) hydrogen sulphide

Correct Answer: (a) methane

Solution:The constituent of the biogas are methane, carbon dioxide, hydrogen sulphide, etc. The main constituent of biogas is methane because its presence is 75%.

32. The depletion in atmospheric ozone layer in last century was due to:

(a) chlorofluorocarbon
(b) carbon monoxide
(c) methane
(d) pesticides

Correct Answer: (a) chlorofluorocarbon

Solution:Chlorofluorocarbons or CFCs are the main cause of ozone layer depletion. These are released by solvents, spray aerosols, refrigerators, air-conditioners, etc. The molecules of chlorofluorocarbons in the stratosphere are broken down by ultraviolet radiations and release chlorine atoms.

33. Which one of the following holds true for a freely falling object?

(a) It moves with a uniform velocity.
(b) It moves with a uniform speed.
(c) It moves with a non-uniform acceleration.
(d) It moves with a uniform acceleration

Correct Answer: (d) It moves with a uniform acceleration

Solution:The falling of a body from a height towards the earth under gravitational force is called Free fall. Such a body is called freely falling body. The earth attracts object towards it due to gravitational force. Whenever object fall towards the earth under this force, we say that object are in free fall. While falling there is no change in direction of motion of object but due to earth attraction, there will be a change in magnitude of the velocity.

Any change in velocity involves acceleration. Whenever an object falls towards earth, an acceleration is involved. This acceleration is due to earth's gravitation force. Therefore it is called as acceleration due to gravity. The acceleration of an object falling freely towards the earth does not depend on mass of object. During free fall, heavier as well as light objects accelerate at same rate.

34. A sound wave of frequency of 2 kHz has a wavelength of 35 cm in a given medium. How long will it take to travel a distance of 2.1 km through the medium?

(a) 30 s
(b) 2.1 s
(c) 3.0s
(d) 4.1s

Correct Answer: (c) 3.0s

Solution:Speed of sound wave v = νλ = 2000 × 0.35 = 700 m/s

Distance d = 2.1 km = 2100 m

Time td/v = 2100/700 = 3

35. Which one of the following conservation laws is a consequence of the Newton's third law of motion?

(a) Conservation of energy
(b) Conservation of momentum
(c) Conservation of charge
(d) Conservation of mass

Correct Answer: (b) Conservation of momentum

Solution:The law of conservation of momentum is based on Newton's third law because the law of conservation of momentum can be derived from the law of action and reaction, which states that every force has a reciprocating equal and opposite force.

36. Which one of the following is a permeable rock that allows water to pass through it?

(a) Granite
(b) Limestone
(c) Quartzite
(d) Sill

Correct Answer: (b) Limestone

Solution:The rocks which have connected pores and allow water. to pass between them. This type of rocks are called permeable rocks or pervious rocks. Limestone and dolomite rocks can occasionally have large porosity and permeability - enough to produce underground caverns on occasion and approximate an underground stream. This happens very rarely, though, and only in areas where the geology is dominantly carbonate, such as the Rush Springs Aquifer.

37. Which one of the following is the deepesť, inland and protected port on the east coast of India?

(a) Chennai
(b) Paradip
(c) Tuticorin
(d) Visakhapatnam

Correct Answer: (d) Visakhapatnam

Solution:Visakhapatnam port is located between the Chennai and Kolkata port i.e. the east coast. Visakhapatnam is one out of the 13 major ports in India.

38. The greatest diversity of animal and plant species is found in

(a) Temperature forests
(b) Deserts and Savannas
(c) Arctic and Alpine systems
(d) Tropical moist forests

Correct Answer: (d) Tropical moist forests

Solution:The greatest variety of animal and plant species is found in tropical moist forests. The rainforest is rich in fauna. Birds such as toucans, humming birds, macaw with their brilliantly Coloured plumage, oversized bills for eating make them different from birds we commonly see in India.

Animals like monkeys, sloth and ant-eating tapirs are found here. Various species of reptiles and snakes also thrive in these jungles. Crocodiles, snakes, pythons abound. Anaconda and boa constrictor are some of the species.

Besides, the basin is home to thousands of species of insects. Several species of fishes including the flesh-eating Piranha fish is also found in the river.

39. Which one among the following statements about 'Drumlin' is correct?

(a) It is a streamlined hill moulded in glacial drift on the till plains.
(b) It is a city located in central Europe.
(c) It is a river.
(d) It is a narrow road in Tibet.

Correct Answer: (a) It is a streamlined hill moulded in glacial drift on the till plains.

Solution:Drumlins are smooth oval shaped ridge-like features composed mainly of glacial till with some masses of gravel and sand. The long axes of drumlins are parallel to the direction of ice movement. One end of the drumlins facing the glacier called the stoss end is blunter and steeper than the other end called tail. The drumlins form due to dumping of rock debris beneath heavily loaded ice through fissures in the glacier. The stoss end gets blunted due to pushing by moving ice. Drumlins give an indication of direction of glacier movement:

40. Which one of the following is the busiest sea route and links two industrially developed regions of the world?

(a) Mediterranean - Indian Ocean sea route
(b) The Northern Atlantic sea route
(c) Cape of Good Hope sea route
(d) The North Pacific sea route

Correct Answer: (b) The Northern Atlantic sea route

Solution:The busiest oceanic route is- The North-Atlantic Ocean route. The idea of its multi-channel routes can be taken from- South America to North America(Panama Canal), Africa to Europe, and Europe to Asia (through Gibraltar Strait connecting the Mediterranean Sea).

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