Part-B (General Ability) NDA/NA Solved Paper 2017-I

General Knowledge

Total Questions: 50

31. Which one of the following is NOT a target of the 12th Five-Year Plan?

Correct Answer: (b) Agriculture Growth Rate of 5 per cent
Solution:

Main targets of 12th five year plans were:
i. This five year plan aim to achieve 8.2% growth.
ii. Achieve 4% (not 5%) growth in agriculture.
ii. Reduce poverty by 10% points, by 2017.
iv. Health, education and skill development, environment and natural resources and infrastructure development are the main focus area
of this plan.

32. Which one of the following statements is NOT correct?

Correct Answer: (b) The amount of heat required to raise the temperature of a substance is called its specific heat capacity
Solution:

The specific heat is the amount of heat required to raise the temperature of 1 g of substance by one degree Celsius or one Kelvin.

Specific heat = Q/m△T

33. The amount of heat required to change a liquid to gascous state without any change in temperature is known as

Correct Answer: (c) latent heat of vaporization
Solution:

The amount of energy needed to change one gram ofa liquid substance to a gas at constant temperature is called latent heat vaporization.

34. The following figure shows displacement versus time curve for a particle executing simple harmonic motion:

Which one of the following statements is correct?

Correct Answer: (c) Phase of the oscillating particle is same at t = 3s and t=7s
Solution:

Phase of oscillating particle at any instant is a physical quantity which completely expresses the position and direction of motion of particle at that instant with respect to its mean position. Phase of the oscillating
particle is same at t = 3 s and t=7 s.

35. Match List I with List II and select the correct answer using the code given below the Lists:

Correct Answer: (a)
Solution:

Hypermetropia, sometimes talled hyperopia, is the term used to define being longsighted, Myopia is the term used to define being shortsighted.
A myopic person has clear vision when looking at objects close to them, but distant objects will appear blurred. Presbyopia is when your eyes gradually lose the ability to see things clearly up close. It is a normal part of aging. Contaract is a condition in which the
clarity of the natural lens reduces. Lens of the eye becomes Opaque.

36. A circular coil of single turn has a resistance of 20 Ω. Which one of the following is the correct value for the resistance between the ends of any diameter of the coil?

Correct Answer: (a) 5 Ω
Solution:

Each of the two semicircles between the two ends of the diameter has a resistence of 20/2 = 10. These two resistors are in parallel between the 2 ends of the diameter. Thus the effective resistance

37. In a solenoid, the current flowing through the wire is I and number of turns per unit length is n. This gives a magnetic field B inside the solenoid. If number ofturn per unit length is increased to 2n, what will be the value of magnetic field in the solenoid?

Correct Answer: (b) 2B
Solution:

A long solenoid is the one which has a larger length in comparison to the radius. It consists of a long wire wound in the form of a helix where the neighboring turns are closely spaced. So each turn can be regarded
as a circular loop. The net magnetic field is the vector sum of the fields due to all the turns. Enamelled wires are used for winding so that turns are insulated from each other.

The magnetic field inside a long solenoid is: B=μ₀nI ..(1) where n = number ofturns per unit length and I = current flowing through the solenoid. The magnetic field at a point on one end ofthe long solenoid
is: B= (μ₀nI/2)

38. Which one of the following statements is correct about the magnification of an optical microscope?

Correct Answer: (d) Magnification decreases with the increase in focal length of eyepiece
Solution:

A telescope operates with an object at infinity (or close to it), and the angular magnification is given by the ratio between objective and eyepiece focal lengths. So increasing the objective focal length increases the magnification - but it also makes the telescope tube longer, which can be awkward. So, normally, you increase magnification by switching to a shorter focal length eyepiece, not a longer focal length objective
and Vice versa.

39. A homogeneous mixture contains two liquids. How are they separated?

Correct Answer: (c) By distillation
Solution:

The homogeneous mixtures that are represented by a single uniform phase, throughout the entire mixture, can be separated using the properties of the components that participate in mixture. The method of
separation of homogeneous mixtures is called distillation and it is based on the various boiling points of the component of mixture. Heating the mixture, the component that has the lowest boiling point will evaporate and the separation can be done.

40. Which one of the following elements forms highest number of compounds?

Correct Answer: (d) Carbon
Solution:

Carbon is the element which forms the highest number of compounds especially organic compounds due to its catenation(long chain formation) ability.. Carbon, with 4 valence atoms and by virtue of being in the 1st row of the periodic table is most suited to form the highest number of compounds.