CAPF (AC) 2020 (Paper-1) (Question 1-50)

Total Questions: 50

21. At triple point the substance co-exists in

1. Liquid phase

2. Solid phase

3. Vapour phase

Select the correct answer using the code given below :

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

Correct Answer: (d) 1, 2 and 3

Solution:The triple point of a substance is the temperature and pressure at which all the three phases that are gas, liquid, and solid of that substance coexist in thermodynamic equilibrium.

22. Latent heat corresponds to the change in heat at constant

(a) temperature only
(b) volume only
(c) pressure only
(d) temperature, volume and pressure

Correct Answer: (a) temperature only

Solution:Latent heat is the energy released or absorbed by a body or a thermodynamic system during a constant-temperature process. In the process, the temperature remains constant.

23. Which one of the following statements on photoelectric effect is NOT correct?

(a) Albert Einstein received the Nobel Prize in Physics for explaining photoelectric effect
(b) For each metal, there is a threshold frequency v below which this effect is not observed
(c) At a frequency v > v₀, the kinetic energy of ejected . electrons does not change on increasing the frequency of incident light
(d) The number of electrons ejected is proportional to the intensity of incident light

Correct Answer: (c) At a frequency v > v₀, the kinetic energy of ejected . electrons does not change on increasing the frequency of incident light

Solution:In the Photoelectric effect, above a threshold value of v > v₀, the kinetic energy of the electrons is linearly proportional to the frequency of the incident radiation. The number of electrons however is proportional to the light intensity.

24. Which one of the following is the average atomic mass of chlorine atom?

(a) 35.9 u
(b) 35.5 u
(c) 35.0 u
(d) 37.0 u

Correct Answer: (b) 35.5 u

Solution:The average Atomic mass of Chlorine is 35.5u. The Average atomic mass is calculated to don the basis of two isotopes of chlorine along with their per cent abundances in nature.

chlorine-35: atomic mass = 34.969 amu and percentage abundance = 75.77%

chlorine-37: atomic mass = 36.966 amu and percentage abundance = 24.23%

The individual atomic mass of chlorine-35 is 0.7577 × 34.969-26.50 amu and of

chlorine-37 is 0.2423 × 26.966 = 8.957 amu.

The average atomic mass will be 26.50 + 8.957 = 35.5 amu

25. Which one of the following is NOT a heterocyclic aromatic compound?

(a) Tropolone
(b) Furan
(c) Thiophene
(d) Pyridine

Correct Answer: (a) Tropolone

Solution:Cyclic Aromatic compounds containing one or more heteroatoms in their rings are called heterocyclic aromatic compounds. Atoms other than C and H are known as heteroatoms. Furan (C4H4O), Thiophene (C4H4S) and Pyridine (C5H5N) are heterocyclic aromatic compounds. Troplone is not a heterocyclic aromatic compound.

26. Which one of the following minerals is NOT a naturally occurring silicate?

(a) Feldspar
(b) Zeolite
(c) Mica
(d) Bauxite

Correct Answer: (d) Bauxite

Solution:Feldspar, Mica, and Zeolites are naturally occurring Silicates. Zeolites can also be synthetic. Bauxite is a naturally occurring, heterogeneous material composed primarily of aluminium hydroxide. It is not a naturally occurring silicate.

27. In which part of the cell, the glucose is converted into pyruvate?

(a) Mitochondria
(b) Nucleus
(c) Cytoplasm
(d) Endoplasmic reticulum

Correct Answer: (c) Cytoplasm

Solution:Glucose is converted into pyruvate in the cytoplasm of the cell. This conversion takes place through the process known as glycolysis. Glycolysis is used by all cells in the body for energy generation.

28. After fertilization, the ovule and ovary subsequently develop to form

(a) seed and fruit respectively
(b) fruit and seed respectively
(c) seed and flower respectively
(d) degenerated ovule and seedless fruit respectively

Correct Answer: (a) seed and fruit respectively

Solution:Fertilization is the process of fusion of the male gametes (pollen) with the female gametes (ovum) to form a diploid zygote. It is a physicochemical process that occurs after pollination. After fertilization, the Ovary is converted into fruit and the ovule is converted into seeds.

29. Which one of the following statements is correct?

(a) Glucose breaks down to CO₂, H₂O and energy in all organisms
(b) Glucose breaks down into ethanol, CO, and energy in our muscle cells
(c) Glucose breaks down into CO₂, H₂O and energy in all aerobic tissues
(d) Glucose breaks down into lactate and energy in yeast

Correct Answer: (c) Glucose breaks down into CO₂, H₂O and energy in all aerobic tissues

Solution:In all aerobic cells of the body, the glucose is broken down to give rise to Carbon dioxide, water and energy in the form of ATP. The stages of cellular respiration are glycolysis which is an anaerobic process. Aerobic steps involve the Krebs cycle and oxidative phosphorylation.

C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + ATP

30. Growing two or more crops in the same field but in different rows is called

(a) Crop rotation
(b) Inter cropping
(c) Alternate cropping
(d) Khariff cropping

Correct Answer: (b) Inter cropping

Solution:In Intercropping two or more crops are grown in the same field in alternate rows. The most common goal of intercropping is to produce a greater yield on a given piece of land by making use of resources or ecological processes.

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