The question asks to identify the chemical compound used in photography. This requires knowledge of the basic chemistry involved in traditional photographic processes.
Correct Option: B) Silver Bromide is widely used in traditional photography due to its high sensitivity to light. When exposed to light, silver bromide crystals undergo a photochemical reaction, forming tiny specks of metallic silver. These specks form the latent image, which is then chemically amplified during the development process to produce a visible image.
The question asks to identify the specific Article in the Indian Constitution where Fundamental Duties are enshrined. This requires knowledge of the constitutional provisions related to Fundamental Duties.
Correct Option: A) Article 51 A is the correct answer. Fundamental Duties were added to the Indian Constitution by the 42nd Amendment Act, 1976, and are enshrined in Article 51 A under Part IV-A.
To determine which physical quantity has the same unit as momentum, we need to recall the definitions and units of momentum and each of the given options.
Correct Option: C) impulse
The question asks about the fundamental mineral structure of diamond. To answer this, one needs to recall the basic chemical composition of diamond.
Correct Option: D) Carbon. Diamond is an allotrope of carbon, meaning it is entirely composed of carbon atoms arranged in a specific crystal lattice structure. Each carbon atom in a diamond is covalently bonded to four other carbon atoms in a tetrahedral arrangement, which accounts for its extreme hardness and high melting point.
The question asks to identify an example of a fossil fuel from the given options. We need to understand what constitutes a fossil fuel and then evaluate each option.
B) Natural gas is a naturally occurring hydrocarbon mixture formed from the decomposition of organic matter over geological time, fitting the definition of a fossil fuel.
The question asks to identify the body part primarily affected by Jaundice. Jaundice is a condition characterized by yellowing of the skin and eyes due to an excess of bilirubin in the blood. Understanding the metabolism and excretion of bilirubin is key to identifying the affected organ.
B) Liver — The liver is the primary organ responsible for processing and excreting bilirubin. Any dysfunction or overload of the liver's capacity to handle bilirubin results in its accumulation in the blood, leading to the characteristic yellowing of skin and eyes known as jaundice.
The question asks to identify the crop in which Uttar Pradesh is the top producer in India as of 2018. This requires knowledge of agricultural production statistics in India, specifically the leading states for various crops.
As per agricultural statistics for 2018 (and generally consistently over many years), Uttar Pradesh is the largest producer of wheat in India.
D) wheat — Uttar Pradesh is consistently the largest producer of wheat in India. Its fertile Indo-Gangetic plains and extensive irrigation facilities make it ideal for wheat cultivation. As of 2018, it maintained its top position in wheat production.
The question asks for the safe temperature to store eatables in a refrigerator to keep them fresh. This involves understanding the principles of food preservation and bacterial growth.
Correct Option: A) 4°C is the generally recommended safe temperature for refrigerators to keep eatables fresh, as it significantly slows down bacterial growth.
The question asks to identify the best conductor of electricity among the given options. Electrical conductivity is a measure of how easily electric current flows through a material. This property is primarily determined by the availability of free electrons in the material's atomic structure.
Correct Option: D) Silver
To solve this problem, we will first assume the original length and breadth of the rectangle. Then, we will calculate the original area. Next, we will find the new length and breadth after the given percentage changes and calculate the new area. Finally, we will compare the new area with the original area to determine the percentage change.
Assume original dimensions:
Let the original length of the rectangle be \(L\) and the original breadth be \(B\).
Calculate original area:
The original area (\(A_{\text{original}}\)) is given by:
Calculate new length:
The length is increased by 20%. So, the new length (\(L_{\text{new}}\)) will be:
Calculate new breadth:
The breadth is decreased by 20%. So, the new breadth (\(B_{\text{new}}\)) will be:
Calculate new area:
The new area (\(A_{\text{new}}\)) is given by:
Calculate the change in area:
The change in area is \(A_{\text{new}} - A_{\text{original}}\):
Calculate the percentage change in area:
Percentage change is given by:
Alternatively, a shortcut formula for successive percentage changes is: If a quantity is first increased by \(x\%\) and then decreased by \(y\%\), the net percentage change is \(\left(x - y - \frac{xy}{100}\right)\%\). In this case, \(x = 20\) and \(y = 20\).
\[ \text{Net Change} = \left(20 - 20 - \frac{20 \times 20}{100}\right)\% = \left(0 - \frac{400}{100}\right)\% = -4\% \]A negative sign indicates a decrease.
Correct Option: B) decreases by 4%