CAPF (AC) 2019 (Paper-1) (Question 51-100)

1. Which of the following organisms belongs to Coelenterata (Cnidaria)?

(a) Planaria and liverfluke
(b) Sea urchin and sea cucumber
(c) Hydra and sea anemone
(d) Euplectella and sycon

Correct Answer: (c) Hydra and sea anemone

Solution:Hydra and sea anemone are coelenterates. These are also known as Cnidarians and are mostly marine. The body is radially symmetrical, diploblastic without a coelom. The body has a single opening known as hypostome with nematocysts. Jellyfishes and corals also belong to Coelenterata.

2. Bending of shoot of a plant towards light can be referred to as

(a) photonasty
(b) positive phototropism
(c) negative phototropism
(d) photoperiodism

Correct Answer: (b) positive phototropism

Solution:Bending of the shoot of a plant towards light is referred to as positive phototropism. On the other hand root displays negative phototropism which means the root grows away from the light.

3. Epidermal cells of plant roots increase their absorption surface by having

(a) Scales
(b) Root hairs
(c) Endodermis
(d) Stomata

Correct Answer: (b) Root hairs

Solution:Root hairs are delicate outgrowths of epidermal cells. These cells help the epidermal cells of plant roots to increase their absorption surface. These cells actively facilitate absorption water and nutrient absorption by enhancing the absorptive surface.

4. Quartz is extensively used as a piezoelectric material. It contains

(a) Hg
(b) Si
(c) Ti
(d) Sn

Correct Answer: (b) Si

Solution:Quartz is chemically Silicon dioxide (Si*O_{2}) consisting of one silicon and two oxygen. It has various applications including use as piezoelectric material.

5. Which one of the following is used for water softening?

(a) Mg (HCO₃)₂
(b) Na₃ PO₄
(c) Na₆ P₆ O₁₈
(d) Na₂HPO4

Correct Answer: (c) Na₆ P₆ O₁₈

Solution:Na₆ P₆ O₁₈ is used for water softening. This compound Sodium hexa-metaphosphate also known by other name 'Calgon' and is added to hard water for softening.

6. If formula of sodium salt of an anion X is Na₂ X then the formula of its aluminium salt would be

(a) AI X
(b) Al Z₃
(c) Al₂X₃
(d) Al₃ X₂

Correct Answer: (c) Al₂X₃

Solution:If the formula of the sodium salt of an anion X is Na₂ X then the formula of its Aluminium salt would be Al₂ X₃ It is because the valency of X is 2 and that of Na is 1. Since valency of Al is 3 hence the aluminium salt of X will be Al₂ X₃.

7. In a closed economy with no taxes, if the marginal propensity to consume is always 0.90, then the value of the multiplier will be

(a) 10.00
(b) 1.00
(c) 0.90
(d) 0.10

Correct Answer: (a) 10.00

Solution:The value of multiplier = 1/1-marginal propensity to consume

= 1/1 - 0.9 = 1/0.1 = 10

In a closed economy with no taxes, if the marginal propensity to consume is always 0.90, then the value of the multiplier will be 10.0.

8. According to simple Keynesian theory, the slope of the aggregate consumption curve against income is

(a) Positive
(b) Negative
(c) Zero
(d) Infinity

Correct Answer: (a) Positive

Solution:According to simple Keynesian theory, the slope of the aggregate consumption curve against income is positive. It is because when income rises consumption also increases and it is also true in reverse case and thus slope is positive.

9. Which one of the following is an example of a price ceiling?

(a) Fares charged by Airlines in India
(b) Price printed on biscuit packets
(c) Minimum support price for cane growers
(d) Minimum wages fixed by state Governments

Correct Answer: (b) Price printed on biscuit packets

Solution:The price printed on biscuit packets is an example of price ceiling. price ceiling is a type of regulation in which the price charged for a given product is kept under a certain price limit.

10. Which one of the following statements is true with regard to an economy which is on its production possibility frontier?

(a) The economy has to sacrifice some production of one commodity in order to increase the production of another commodity
(b) There is no limit or constraint for the economy in the production of goods and services
(c) The economy can produce more of one commodity up to a point without reducing the production of any other commodity
(d) Its production possibility frontier is an upward sloping curve

Correct Answer: (a) The economy has to sacrifice some production of one commodity in order to increase the production of another commodity

Solution:When an economy is on its production possibility frontier, it means that it is operating at its maximum potential and efficiently allocating its resources. This implies that the economy cannot increase the production of one commodity without sacrificing the production of another commodity. In other words, to produce more of one good, the economy has to give up some production of another good.