General Knowledge (Part-B: English) NDA/NA SOLVED PAPER 2021-II (51 to 100)

Total Questions: 50

1. Girth of stem of a plant increases due to division of cells in

Correct Answer: (b) lateral meristem only
Solution:The lateral meristem is a type of meristem that occurs in the lateral areas of a plant. Thus, it is responsible for the secondary growth of the plant, i.e. the increase in girth. Meristematic tissues consist of cells that are actively dividing. They are responsible for the indeterminate growth in plants. They give rise to permanent plant tissues such as vascular tissues, epidermis, phellem, ground tissues, etc.

2. Different varieties of the same gene are called

Correct Answer: (c) Alleles
Solution:An allele is a variant of a gene controlling the same trait and occupying a specific region on a chromosome (called the locus).
One famous example of how alleles work is the alleles responsible for the flower colour in garden peas. The colour of garden peas flowers can be either purple or white. The gene coding for this trait, responsible for producing a purple pigment, is found in two forms, allele for purple colour and allele for white colour.
(This was one of the seven traits studied by Gregor Mendel in his experiments that later established the principles of genetics.)

3. Which one of the following viruses used to be responsible for highly infectious disease Smallpox?

Correct Answer: (b) Variola virus
Solution:Thevariola virus caused smallpox. Smallpox was a serious infectious disease. It spread from one person to another. People who had smallpox had a fever and a distinctive, progressive skin rash. Before smallpox has been eradicated.

4. Buoyancy is a/an

Correct Answer: (d) upward force
Solution:The buoyant force is an upward force exerted by a fluid that opposes the weight of an immersed object. The buoyant force exerted on a body immersed in a fluid is equal to the weight of the fluid the body displaces is called the Archimedes principle.
If the buoyant force is greater than the object's weight, the object will rise to the surface and float. If the buoyant force is less than the object's weight, the object will sink. If the buoyant force equals the object's weight, the object will remain suspended at that depth.

5. Weight and mass of an object are defined with Newton's laws of motion. Which among the following is true?

Correct Answer: (b) Mass is a constant of proportionality.
Solution:Directly proportional means that if one quantity increases then the other quantity also increases if the quantities are directly proportional.
Given: mass is directly proportional to weight
Mathematically it can be written as -
weight α mass
weight = mass × k
where k is the constant of proportion after the proportionality sign is removed.

6. Fundamental laws of physics require

Correct Answer: (d) conservation of energy, momentum and charge.
Solution:Conservation laws are fundamental to our understanding of the physical world, in that they describe which processes can or cannot occur in nature. For example, the conservation law of energy states that the total quantity of energy in an isolated system does not change, though it may change form. With respect to classical physics, conservation laws include conservation of energy, mass (or matter), linear momentum, angular momentum, and electric charge.
Conservation laws have broad application in physics, as well as in other fields such as chemistry, biology, geology,

7. Work is said to be one Joule when a force of

Correct Answer: (a) 4 N moves an object by 25 cm.
Solution:SI unit of work is joule which is denoted by J.
1 joule = 1 newton × 1 meter
1 J = 1 Nm
1 joule of work is said to be done when a force of 1 Newton moves an object through a distance of 1 meter in direction of the force.

8. A uniform motion of a car along a circular path experiences.

Correct Answer: (b) a change in velocity due to a change in its direction of motion
Solution:An object in uniform circular motion experiences an inward net force. This inward force changes in velocity due to a change in its direction of motion.
It is sometimes referred to as a centripetal force, where centripetal describes its direction. Without this centripetal force, an object could never alter its direction.
The fact that the centripetal force is directed perpendicular to the tangential velocity means that the force can alter the direction of the object's velocity vector without altering its magnitude.

9. Three equal resistors are connected in parallel configuration in a closed electrical circuit. Then the total resistance in the circuit becomes

Correct Answer: (a) one-third of the individual resistance.
Solution:When n resistor of equal value is connected in parallel then the resultant resistance is R/n and
When n resistor of the same value is connected in series then the resultant resistance is n/R
So, according to your question
⇒ R/3 =1
⇒ R = 3 Ohm
Now, when they are connected in series
⇒ R = 3*3 = 9 Ohm

10. Give the correct answer?

Correct Answer: (c) Atomic Nucleus
Solution:Rutherford's alpha-particle scattering experiment was responsible for the discovery of the Atomic Nucleus. Before Rutherford's experiment, people knew about Proton and Electron, however, the existence of neutrons was not known. Rutherford's alpha-particle scattering experiment that the Atomic nucleus existed. In the experiment, a fraction of the particles bounced back at an angle of 180° providing that nearly all the mass of an atom is contained in the nucleus.