The question asks to identify a human attitude change that contributes to decreasing non-biodegradable waste production. We need to evaluate each option based on its impact on waste generation, specifically focusing on non-biodegradable materials.
C) Use of jute bags — Jute is a natural, biodegradable material. By choosing jute bags over plastic bags, individuals directly reduce the amount of non-biodegradable waste generated, reflecting a positive shift in attitude towards environmental conservation.
The following chart shows the percentage of expenditure of Mr. Kumar on various heads in a month. The total monthly expenditure of the house is Rs. 1,12,000 (Rupees One lac twelve thousand only). Study the chart and answer the question.
What is the total expenditure of Mr. Kumar on Petrol and Water taken together during this month?
To find the total expenditure of Mr. Kumar on Petrol and Water, we need to calculate the percentage of the total expenditure for each of these categories and then sum them up.
Thus, the total expenditure on Petrol and Water is Rs. 52,640.
Correct Option: C) Rs. 52,640
Find the value of 2sec2A + 4cosec2A - 2tan2A - 4cot2A.
The problem asks us to simplify a trigonometric expression. We can use fundamental trigonometric identities to simplify the given expression. The key identities to remember are \(\sec^2 A - \tan^2 A = 1\) and \(\csc^2 A - \cot^2 A = 1\).
Write down the given expression:
\[ 2\sec^2 A + 4\csc^2 A - 2\tan^2 A - 4\cot^2 A \]Rearrange the terms to group similar trigonometric functions:
\[ (2\sec^2 A - 2\tan^2 A) + (4\csc^2 A - 4\cot^2 A) \]Factor out the common coefficients from each group:
\[ 2(\sec^2 A - \tan^2 A) + 4(\csc^2 A - \cot^2 A) \]Apply the fundamental trigonometric identities:
Substitute these identities into the expression:
\[ 2(1) + 4(1) \]Perform the multiplication and addition:
\[ 2 + 4 = 6 \]Thus, the value of the expression is 6.
B) 6 is the correct answer because by applying the fundamental trigonometric identities \(\sec^2 A - \tan^2 A = 1\) and \(\csc^2 A - \cot^2 A = 1\), the expression simplifies to \(2(1) + 4(1) = 2 + 4 = 6\).
The question asks about the factors that influence the electrical resistance of a conductor. We need to identify which of the given options does NOT affect the resistance.
Based on this analysis, the current flowing through the conductor is the factor that does not determine its resistance.
Correct Option: B) current flowing through the conductor
The question asks to identify a characteristic landform specifically associated with deserts. We need to evaluate each option to determine its typical geographical context.
Based on this analysis, barchans are the most appropriate characteristic associated with deserts.
D) Barchans — Barchans are crescent-shaped sand dunes formed by wind in sandy deserts. They are a definitive geomorphological feature of arid environments.
This problem can be solved using Ohm's Law, which states the relationship between potential difference (voltage), current, and resistance in an electrical circuit. We are given the potential difference and the current, and we need to find the resistance.
The current is given in milliamperes (mA), which needs to be converted to amperes (A) for calculations using Ohm's Law.
\[ 1 \text{ mA} = 10^{-3} \text{ A} \]\[ I = 2.5 \text{ mA} = 2.5 \times 10^{-3} \text{ A} \]Ohm's Law is given by the formula:
\[ V = I \times R \]where \(V\) is the potential difference, \(I\) is the current, and \(R\) is the resistance.A) 2000
The calculated resistance is \(2000 \text{ } \Omega\), which matches option A.
In this question, a group of numbers/symbols is coded using letters as per the table given below and the conditions which follow. The correct combination of codes following the conditions is your answer.
| Number/Symbol | 7 | 8 | 5 | & | 6 | % | 2 |
| Codes | S | D | M | U | T | L | A |
Question: 7 6 & 5 8 % 6 2
The problem requires decoding a sequence of numbers and symbols based on a given mapping table. We need to match each number/symbol in the question sequence with its corresponding code from the table.
B) ATUMDLTS is incorrect. Let's re-evaluate. The sequence is 7 6 & 5 8 % 6 2. The codes are: S T U M D L T A.
Let's check the provided options against our derived code: S T U M D L T A.
Option B is ATUMDLTS. This does not match our derived code.
There seems to be a discrepancy between the provided correct answer (B) and the derived code (STUMDLTA) based on the given table. Let's re-examine the question and options carefully.
The question asks for the correct combination of codes following the conditions. If there are no conditions mentioned, it's a direct mapping.
Let's assume there might be a typo in the question's provided correct answer or the options. Based purely on the direct mapping:
The sequence is STUMDLTA.
Let's check the options again:
A) ATYYDLTS (Incorrect, Y is not in the codes)
B) ATUMDLTS (Incorrect, first letter A, should be S)
C) ADUMTLTS (Incorrect, first letter A, should be S)
D) STUMDLTA (This matches our derived code exactly).
Given that the provided correct answer is B, there must be some unstated condition or a different interpretation. However, based on the explicit information given (table and no conditions), D is the correct answer.
If we assume the provided correct answer B (ATUMDLTS) is correct, then the mapping would have to be different or there's a condition that reverses the sequence or changes specific characters. Without any conditions, it's a direct mapping.
Let's assume there was a typo in the question and the correct answer is indeed D, which matches the direct mapping.
However, since the instruction is to explain why the given correct answer (B) is right, let's try to find a scenario where B could be correct. This usually involves unstated conditions like "if the first and last are numbers, swap their codes" or "if there is a symbol in the middle, reverse the sequence". Since no such conditions are provided, we must stick to direct mapping.
Let's assume the provided correct answer B is correct and try to reverse-engineer. If the answer is ATUMDLTS:
This implies a different mapping for 7 and 2, and potentially a reversal or other manipulation. Without conditions, this is not derivable.
Re-evaluation based on the assumption that the provided correct answer B is indeed correct, and there might be a subtle unstated rule or a misinterpretation of the question.
Let's check the options again against the sequence 7 6 & 5 8 % 6 2 and the codes S D M U T L A.
If we look at option B: ATUMDLTS
Let's map it back to numbers/symbols:
So, ATUMDLTS corresponds to 2 6 & 5 8 % 6 7.
The question sequence is 7 6 & 5 8 % 6 2.
Comparing 7 6 & 5 8 % 6 2 with 2 6 & 5 8 % 6 7, we see that the first and last elements are swapped (7 and 2). This implies a condition: "If the first and last elements are numbers, their codes are swapped."
Let's apply this condition:
This matches option B.
Therefore, there is an implicit condition that needs to be inferred for option B to be correct.
B) ATUMDLTS. This option is correct if we assume an unstated condition: "If the first and last elements of the sequence are numbers, then their corresponding codes should be swapped."
This is a logical reasoning problem involving the arrangement of seven boxes. We need to deduce the exact position of each box based on the given clues and then identify the position of Box P.
Correct Option: D) Immediately below S
From our arrangement, S is at Position 3 and P is at Position 4. Therefore, P is immediately below S.
This problem involves directional movement and displacement. We need to visualize Mahesh's path and determine his final position relative to the starting point. Since all turns are 90 degrees, we can use a coordinate system or vector addition to find the net displacement. The key is to break down each movement into its North-South and East-West components.
A) 12 m is the correct value for X.
The question asks about the gas evolved when alcohols react with sodium. This is a characteristic reaction used to identify the acidic nature of alcohols, albeit weak. We need to recall the general reaction of active metals with compounds containing acidic hydrogen.
Alcohols contain a hydroxyl group (\(-\text{OH}\)). The hydrogen atom attached to the oxygen in the hydroxyl group is slightly acidic. This is due to the electronegativity of oxygen, which pulls electron density away from the hydrogen, making it easier to remove as a proton.
Sodium (\(\text{Na}\)) is an active metal. Active metals react with compounds containing acidic hydrogen to produce hydrogen gas.
When an alcohol (\(\text{R-OH}\)) reacts with sodium metal, the sodium replaces the acidic hydrogen atom of the hydroxyl group, forming a sodium alkoxide (\(\text{R-ONa}\)) and releasing hydrogen gas (\(\text{H}_2\)).
The general chemical equation for this reaction is:
\[ 2\text{R-OH} + 2\text{Na} \to 2\text{R-ONa} + \text{H}_2(\text{g}) \]For example, if we take ethanol (\(\text{CH}_3\text{CH}_2\text{OH}\)), the reaction would be:
\[ 2\text{CH}_3\text{CH}_2\text{OH} + 2\text{Na} \to 2\text{CH}_3\text{CH}_2\text{ONa} + \text{H}_2(\text{g}) \]The evolution of hydrogen gas is observed as effervescence or bubbles.
D) Hydrogen. As explained above, the reaction between alcohols and sodium metal results in the formation of sodium alkoxide and the evolution of hydrogen gas.