Identify the unit to measure sound from the following:
Show Hint
- Particles per hundred
- Decibel
- Particles per thousand
- Nanometer
The Correct Option is B
Solution and Explanation
The unit used to measure the intensity of sound is the decibel (dB). It is a logarithmic unit used to express the ratio of a physical quantity, such as power or intensity, relative to a specified or implied reference level. The decibel is commonly used in acoustics and audio technology.
- Option (A) "Particles per hundred" is incorrect as sound is not measured in terms of particles.
- Option (C) "Particles per thousand" is also incorrect for sound measurement.
- Option (D) "Nanometer" is incorrect as nanometers are used to measure length, not sound.
Thus, the correct answer is (B) Decibel.
Top CBSE CLASS XII Geography Questions
Read the passage carefully and answer the questions that follow:
Hunting and Food Gathering
The earliest human beings depended on their immediate environment for their sustenance. They subsisted on: (a) animals which they hunted; and (b) the edible plants which they gathered from forests in the vicinity. Primitive societies depended on wild animals. People located in very cold and extremely hot climates survived on hunting. The people in the coastal areas still catch fish though fishing has experienced modernisation due to technological development. Many species, now have become extinct or endangered due to illegal hunting (poaching). The early hunters used primitive tools made of stones, twigs or arrows so the number of animals killed was limited. Gathering and hunting are the oldest economic activity known. These are carried out at different levels with different orientations. Gathering is practised in regions with harsh climatic conditions. It often involves primitive societies, who extract both plants and animals to satisfy their needs for food, shelter and clothing. This type of activity requires a small amount of capital investment and operates at very low levels of technology. The yield per person is very low and little or no surplus is produced.- Examine the role of climate, water availability, and soil fertility on the distribution of world population.
- Examine three stages of demographic transition theory.
- Study the map of Rhine waterways and answer the questions that follow:
- Explain the main features of National Highways in India.
Top CBSE CLASS XII Environmental Geography Questions
- “Some wastelands are rendered unfit for agriculture by human activities.” Choose the correct option related to the statement:
(i) Shifting cultivation area
(ii) Coastal plains
(iii) Degraded pastures
(iv) Bhabar areas
- "Nature and human are intricately inter-wined." Analyse the statement.
- "Human beings utilize the opportunities provided by nature." Analyse the statement.
Top CBSE CLASS XII Questions
- 2, b, c are in A.P. and the range of determinant $\begin{vmatrix}1&1&1\\ 2&b&c\\ 4&b^{2}&c^{2}\end{vmatrix}$ is [2, 16]. Then find range of c is
- A boy of mass 50 kg is standing at one end of a, boat of length 9 m and mass 400 kg. He runs to the other, end. The distance through which the centre of mass of the boat boy system moves is
- A capillary tube of radius r is dipped inside a large vessel of water. The mass of water raised above water level is M. If the radius of capillary is doubled, the mass of water inside capillary will be
- A circular disc is rotating about its own axis. An external opposing torque 0.02 Nm is applied on the disc by which it comes rest in 5 seconds. The initial angular momentum of disc is
- A circular disc is rotating about its own axis at uniform angular velocity \(\omega.\) The disc is subjected to uniform angular retardation by which its angular velocity is decreased to \(\frac {\omega}{2}\) during 120 rotations. The number of rotations further made by it before coming to rest is