Communicable Diseases Explained
Communicable diseases are illnesses that can spread from one person or organism to another. This transmission can happen through various ways, such as direct contact, contaminated food or water, or airborne exposure.
Understanding Disease Terminology
The question asks for an alternative name for communicable diseases. Let's look at the options:
- Epidemics: An epidemic refers to a sudden increase in the occurrence of a particular disease in a specific community or region. While communicable diseases can cause epidemics, 'epidemic' describes the scale and spread pattern, not the nature of the disease itself.
- Transmissible: This term directly describes the ability of a disease to be passed from one individual to another. It aligns perfectly with the definition of communicable diseases.
- Rodent: Rodents can be vectors (carriers) for certain diseases (like plague or leptospirosis), but 'rodent' itself is not a synonym for communicable diseases. It refers to a type of animal.
- Contaminated: Contamination refers to the presence of a harmful substance or infectious agent on a surface, object, or person. While contamination is a way communicable diseases spread, 'contaminated' describes a state or method, not the disease category itself.
Why 'Transmissible' is the Correct Term
The core characteristic of a communicable disease is its ability to be transmitted. Therefore, 'transmissible' is a direct and accurate synonym. It emphasizes the key feature of these diseases – their capacity to spread between hosts.
Communicable diseases are fundamentally transmissible diseases.
Important Questions from Miscellaneous
A stone is thrown horizontally from the top of a 20 m high building with a speed of 12 m/s. It hits the ground at a distance R from the building. Taking g = 10 m/s2 and neglecting air resistance will give :
A sphere of volume V is made of a material with lower density than water. While on Earth, it floats on water with its volume f1V (f1 < 1) submerged. On the other hand, on a spaceship accelerating with acceleration a < g (g is the acceleration due to gravity on Earth) in outer space, its submerged volume in water is f2V. Then:
A railway wagon (open at the top) of mass M1 is moving with speed v1 along a straight track. As a result of rain, after some time it gets partially filled with water so that the mass of the wagon becomes M2 and speed becomes v2. Taking the rain to be falling vertically and the water stationery inside the wagon, the relation between the two speeds v1 and v2 is :
Consider the following statements:
1. Distance between the longitudes becomes zero on North Pole and South Pole.
2. Distance between the longitudes is maximum on the Equator.
3. Number of longitudes is more than number of latitudes.
Which of the statements given above is/are correct?
One block of 2⋅0 kg mass is placed on top of another block of 3⋅0 kg mass. The coefficient of static friction between the two blocks is 0⋅2. The bottom block is pulled with a horizontal force F such that both the blocks move together without slipping. Taking acceleration due to gravity as 10 m/s2, the maximum value of the frictional force is :
