CAPF (AC) 2021 (Paper-1) (Question 101-125)

Total Questions: 25

1. The time elapsed between viewing a lightning flash and hearing the thunder of a cloud is 10 s. If the speeds of sound and light in air are 330 m/s and 3 × 108 m/s respectively, how far away is the storm?

(a) About 1650 m
(b) About 3300 m
(c) About 990 m
(d) About 1000 m

Correct Answer: (b) About 3300 m

2. What is the approximate wavelength of violet light in air?

(a) 0.7 µm
(b) 0-6 µm
(c) 0.5 µm
(d) 0.4 µm

Correct Answer: (d) 0.4 µm

Solution:The light which our eyes - our "remote sensors" - can detect is part of the visible spectrum. It is important to recognize how small the visible portion is relative to the rest of the spectrum. There is a lot of radiation around us which is "invisible" to our eyes, but can be detected by other remote sensing instruments and used to our advantage. The visible wavelengths cover a range from approximately 0.4 to 0.7 µm.

3. Which electromagnetic radiation(s) is/are used to cook food?

(a) Infrared radiation only
(b) Microwave radiation only
(c) Infrared and microwave radiations
(d) All electromagnetic radiations

Correct Answer: (c) Infrared and microwave radiations

4. An object is placed 10 cm in front of a lens. The image formed is real, inverted and of same size as the object. What is the focal length and nature of the lens?

(a) 5 cm, converging
(b) 10 cın, diverging
(c) 20 cm, converging
(d) 20 cm, diverging

Correct Answer: (a) 5 cm, converging

5. Which one of the following statements with regrard to a short-sighted person is correct?

(b) A short-sighted person sees the near objects clearly but distant objects blurred and a concave lens is used to correct this defect.
(b) A short-sighted person sees the near objects clearly but distant objects blurred and a concave lens is used to correct this defect.
(c) A short-sighted person sees the near objects blurred but distant objects clearly and a concave lens is used to correct this defect.
(d) A short-sighted person sees the near objects clearly but distant objects blurred and a convex lens is used to correct this defect.

Correct Answer: (b) A short-sighted person sees the near objects clearly but distant objects blurred and a concave lens is used to correct this defect.

Solution:If objects in the distance appear blurry, it could be a sign that you suffer from short sightedness. Close-up vision is generally unaffected in people with myopia. However, in very severe cases of short sightedness, close-up vision can also become blurry. Short sightedness may make it difficult to recognise faces at a distance, and driving can become more difficult too. In children, short sightedness can often be recognised when they have difficulty seeing the blackboard in their classroom, or watching television from a distance.

6. Which one of the following organelles is not found in animal cells?

(a) Cell membrane
(b) Endoplasmic reticulum
(c) Cell wall
(d) Lysosome

Correct Answer: (c) Cell wall

Solution:Plants need rigid structure to support them as well as to defend themselves whereas, animals do not need any sort of cell wall since animals always move, they are not stationary in one particular place like plants, therefore they need to be flexible and as a result of that cell walls are absent.

(B) They are found in both animal and plant cells but are much larger in plant cells. Vacuoles might store food or any variety of nutrients a cell might need to survive. In plant cells, the vacuoles are much larger than in animal cells. When a plant cell has stopped growing, there is usually one very large vacuole.

(C) Presence of plastids is an exclusive character of plant cell. It contain chloroplast which is responsible for autotropic nature of plants. Since animals are heterotrophic, plastids are not found in animal cell.

7. Which one of the following plant tissues has large air spaces?

(a) Sclerenchyma
(b) Meristem
(c) Collenchyma
(d) Aerenchyma

Correct Answer: (d) Aerenchyma

Solution:

Aerenchyma tissue containing enlarged gas spaces -occurs in many plants. It is formed either as part of normal development, or in response to stress (e.g. hypoxia). Two mechanisms of aerenchyma formation have been described; schizogeny, in which development results in the cell separation and lysigeny, in which cells die to create the gas space.

8. Which one of the following is not a connective tissue?

(a) Ligament
(b) Tendon
(c) Smooth muscle
(d) Cartilage

Correct Answer: (c) Smooth muscle

Solution:Smooth muscle (so-named because the cells do not have striations) is present in the walls of hollow organs like the urinary bladder, uterus, stomach, intestines, and in the walls of passageways, such as the arteries and veins of the circulatory system, and the tracts of the respiratory, urinary, and reproductive systems. These are not connective tissues.

9. Which one of the following organisms belongs to the kingdom Monera?

(a) Diatom
(b) Euglena
(c) Anabaena
(d) Ulothrix

Correct Answer: (c) Anabaena

Solution:Anabaena is a Cyanobacteria. These are unicellular prokaryotes that are placed under the kingdom Monera.

10. Which one of the following diseases does not transmit through fine droplets coming out from mouth or nose of an infected person?

(a) Pneumonia
(b) COVID-19
(c) HIV-AIDS
(d) Tuberculosis

Correct Answer: (c) HIV-AIDS