The correct sequence follows the normal production and profit determination process explained in NCERT. First, the firm purchases or hires inputs and incurs the cost of production (II). Next, these inputs are transformed into goods or services (III). The finished output is then sold in the market to earn revenue (I). Finally, the firm determines its profit by subtracting total cost from total revenue (IV). Therefore, the correct sequence is II → III → I → IV. Option A correctly represents this order. Option B places production before acquiring inputs, which is impossible. Option C begins with selling before production. Option D assumes the firm sells output before producing it.

The Assertion is false because profit is calculated by subtracting the cost of production from total revenue, not by adding the two. Profit = Total Revenue − Total Cost The Reason is true because the basic assumption in microeconomics is that firms seek to maximize profit. Thus, the Assertion is false while the Reason is true. Hence, Option D is correct.

Each production activity requires different combinations of inputs and produces different outputs. A rickshaw puller uses a rickshaw and labour to provide rickshaw rides. A domestic helper mainly provides cleaning services through labour. The combination of land, labour, tractor, seed and fertilizer is used to produce wheat. Therefore, the correct matching is: 1 → c 2 → a 3 → b Hence, Option B is correct.

Production is the process of transforming inputs into output. Once produced, these goods and services are made available in the market as supply. Therefore, in many economic discussions, especially in the context of market analysis, the terms production and supply are often used synonymously. Option B is correct because supply represents the output made available for sale. Option A is incorrect because demand refers to consumers' willingness and ability to purchase goods. Option C is incorrect because profit is the difference between revenue and cost. Option D is incorrect because revenue is the income earned from selling output, not the production process itself.

A production function shows the maximum quantity of output that can be produced from given quantities of inputs under a given state of technology. Statement 2 is correct because every production function is defined for a given technology. Statement 3 is correct because the relationship depends on the quantities of inputs employed. Statement 4 is correct because the production function represents the maximum attainable output. Statement 1 is incorrect because input prices influence the cost of production, not the production function itself. Therefore, Option B (2, 3, and 4) is the correct answer.

A production function represents the maximum output that can be obtained from a given combination of inputs under a given technology. Since it deals only with the maximum possible output, it automatically assumes that resources are being used efficiently. The Reason correctly states that the production function specifies the relationship yielding the maximum output for every level of inputs. This is exactly why the production function assumes technical efficiency. Hence, both the Assertion and the Reason are true, and the Reason correctly explains the Assertion. Therefore, Option A is correct.

The production function q = K × L requires both inputs before output can be calculated. First, determine the quantity of labour (L). Next, determine the quantity of land/capital (K). Then multiply the two inputs according to the production function. Finally, obtain the corresponding maximum output q. Thus, the correct sequence is: I → III → II → IV Therefore, Option C is correct.

For the Cobb-Douglas production function: If α + β = 1, output increases in the same proportion as inputs, giving Constant Returns to Scale (CRS). If α + β > 1, output increases by a greater proportion than inputs, resulting in Increasing Returns to Scale (IRS). If α + β < 1, output increases by a smaller proportion than inputs, resulting in Decreasing Returns to Scale (DRS). Therefore, the correct matching is: 1 → c 2 → b 3 → a Hence, Option A is correct.

Technical efficiency means producing the maximum possible output from a given quantity of inputs. Once this maximum output has been achieved, it is impossible to obtain additional output from the same level of inputs without improving technology or increasing inputs. Therefore, Option C is correct. Option A is incorrect because decreased inputs generally reduce output. Option B is incorrect because increasing inputs changes the input combination. Option D is incorrect because the NCERT definition specifically refers to the same level of inputs, not merely an "optimal" level.

A production function specifies the maximum quantity of output (q) obtainable from any given quantities of labour (L) and capital (K), assuming a given level of technology. This represents technical efficiency because each input combination corresponds to one maximum attainable output. Thus, Option A correctly describes the mathematical guarantee provided by a production function. Option B is incorrect because reducing inputs does not necessarily increase output. Option C is incorrect because production requires inputs. Option D is incorrect because time is not the determining factor in the mathematical definition of a production function.

The Assertion is true because a firm can substitute labour for capital (or vice versa) while maintaining the same level of output. Different combinations such as (4L, 1K) and (2L, 2K) may lie on the same isoquant if they produce 10 units of output. The Reason is false because input substitution is possible only when the combinations produce the same maximum level of output, not different output levels. Therefore, the correct answer is Option C.

In the simplified two-factor production model discussed in NCERT, both labour and capital are necessary inputs. If either labour or capital is zero, production becomes zero. Therefore: Statement 1 is incorrect because zero inputs cannot produce output. Statement 2 is incorrect because one positive input alone is insufficient. Statement 3 is correct because both inputs must be positive to obtain positive output. Hence, Option D is the correct answer.

An isoquant is a curve showing all combinations of labour and capital that produce the same quantity of output. Therefore, each isoquant is identified by the specific output level it represents, such as 10 units or 20 units of output. Option B correctly identifies what each isoquant is labeled with. The remaining options refer to concepts that are not represented by isoquant labels.

The explanation of a negatively sloped isoquant begins by recognizing that both labour and capital have positive marginal products (II). Next, we assume that the producer wants to maintain the same level of output (I). Therefore, if one input increases, the other input must decrease to keep output unchanged (III). Thus, the correct order is: II → I → III Hence, Option A is correct.

According to NCERT, the distinction between the short run and the long run is based on whether factors of production can be varied, not on the number of days, months, or years. 1 → b Defining the short run and long run in terms of calendar time is an inadvisable approach because different industries may require different lengths of time to adjust their inputs. Therefore, 1 → b. 2 → a Defining the production period based on the variability of inputs is the correct economic approach and is the accepted NCERT definition. Therefore, 2 → a. 3 → c The short run is the period during which at least one factor of production remains fixed, while other factors may be varied. Therefore, 3 → c. 4 → d The long run is the period during which all factors of production are variable, and no factor remains fixed. Therefore, 4 → d. Thus, the correct matching is: 1 → b 2 → a 3 → c 4 → d Hence, Option D is correct.

In economics, the long run is a period during which all factors of production can be varied. Although it generally lasts longer than the short run, its exact duration is not fixed and varies depending on the nature of the production process and industry. Statement 1 is correct because the long run is generally longer than the short run. Statement 2 is incorrect because there is no universal duration for the long run. Statement 3 is correct because firms can vary both labour and capital simultaneously in the long run. Therefore, the correct answer is Option B (1 and 3 only).

In the short run, one factor (capital) remains fixed while the other (labour) varies. The total output produced at each level of labour is called the Total Product (TP) or Total Product of Labour (TPL). Option C is correct because the schedule records total output corresponding to different quantities of the variable input. Option A and Option B are cost concepts, not production concepts. Option D refers to the additional output from an extra unit of labour, not the total output schedule.

The Assertion is false because firms do not vary the fixed factor in the short run. Instead, they vary the variable factor, such as labour, while keeping capital fixed. The Reason is also false because the variable factor can be changed in the short run. In fact, varying the variable factor is how firms adjust production. Therefore, both statements are false, making Option D the correct answer.

The passage explicitly gives the formula: MPL = ΔTPL / ΔL This means that Marginal Product of Labour is calculated by dividing the change in Total Product (ΔTPL) by the change in Labour (ΔL) while keeping capital constant. Therefore, Option B is correct. Option A is the formula for Average Product of Labour (APL), not MPL. Option C has no basis in the NCERT definition. Option D is unrelated to the definition of marginal product.

The passage clearly states that marginal product is undefined at the zero level of input employment because inputs cannot take negative values. Since MPL is measured as the change in output resulting from an additional unit of labour, there is no previous level of labour from which to measure this change when labour is zero. Therefore, Option C is correct. Option A is incorrect because MPL is not zero. Option B is incorrect because MPL is not infinite. Option D is incorrect because MPL and Average Product are different concepts.