The question asks to identify which option is NOT a property of minerals. We need to recall the defining characteristics of minerals and then evaluate each given option against these characteristics.
Correct Option: A) Presence of supplied
The question asks about the characteristics of "Brent crude oil" in the context of global oil prices. To answer this, we need to evaluate each statement provided regarding its classification, origin, and sulfur content.
Based on this analysis, statements 1 and 2 are correct, while statement 3 is incorrect.
Correct Option: B) 1 and 2 only
The question asks about the function of heavy water in a nuclear reactor. This is a fundamental concept in nuclear physics and reactor technology. The key is to understand the role of different materials in controlling the nuclear chain reaction.
A) Slow down the speed of neutrons. Heavy water acts as a moderator in a nuclear reactor, reducing the kinetic energy of fast neutrons produced during fission. This slowing down is crucial because thermal (slow) neutrons are much more likely to cause further fission in uranium-235, thereby sustaining the nuclear chain reaction efficiently.
The question asks us to evaluate an Assertion (A) and a Reason (B) related to physical properties. We need to determine if each statement is correct and if the Reason correctly explains the Assertion.
C) Only (A) correct. This option correctly states that Assertion (A) is true, and Reason (B) is false.
The question asks to identify the emissions from coal combustion at thermal power plants from a given list of substances. We need to recall the primary byproducts of burning coal, which is a fossil fuel primarily composed of carbon, but also contains other elements like sulfur and nitrogen.
D) 1, 2 and 3 — All three listed substances (Carbon dioxide, Oxides of nitrogen, and Oxide of sulphur) are major emissions resulting from the combustion of coal in thermal power plants. Carbon dioxide is a product of carbon combustion, sulfur oxides come from sulfur impurities in coal, and nitrogen oxides are formed from both nitrogen in coal and atmospheric nitrogen at high temperatures.
The question asks about the characteristics of Indian coal. We need to evaluate each given statement (high ash content, low sulphur content, low ash fusion temperature) to determine which ones accurately describe Indian coal.
Correct Option: A) 1 and 2 only