The question asks to identify the journal published in 1851 for social-religious reforms among the Parsis. This requires knowledge of prominent newspapers and journals associated with social reform movements in 19th-century India, specifically those related to the Parsi community.
Correct Option: C) Rast Goftar
Rast Goftar was a Gujarati newspaper founded in 1851 by Dadabhai Naoroji and Kharshedji Cama. It played a crucial role in advocating for social and religious reforms within the Parsi community, promoting modern education, and challenging orthodox practices.
If the surface area of a sphere is 2124\( \frac{4}{7} \) cm², then what is the radius of that sphere? [Use π = \( \frac{22}{7} \)]
The problem asks us to find the radius of a sphere given its surface area. We will use the formula for the surface area of a sphere and substitute the given values to solve for the radius.
D) 13 cm — The calculated radius of the sphere is 13 cm, which matches this option.
The problem involves calculating the age of the mother using the concept of average age. We are given the average age of a family of four members (father, mother, and 2 children) and the sum of the ages of three of these members (father and 2 children). We can use the formula for average age to find the total age of the family and then subtract the sum of the known ages to find the mother's age.
A) 42 years is the correct age of the mother, as calculated by subtracting the sum of the father's and children's ages from the total family age.
The question asks to identify a chemical that contributes to the depletion of the ozone layer. This requires knowledge of common ozone-depleting substances (ODS).
Correct Option: D) chlorofluorocarbon
Chlorofluorocarbons (CFCs) are synthetic organic compounds containing carbon, chlorine, and fluorine atoms. They were widely used as refrigerants, propellants in aerosol cans, and in fire extinguishers. When released into the atmosphere, CFCs rise to the stratosphere where UV radiation breaks them down, releasing chlorine atoms. These chlorine atoms then catalytically destroy ozone molecules (\(\text{O}_3\)). The overall reaction can be simplified as:
\[ \text{Cl} + \text{O}_3 \rightarrow \text{ClO} + \text{O}_2 \]\[ \text{ClO} + \text{O} \rightarrow \text{Cl} + \text{O}_2 \]The chlorine atom is regenerated, allowing it to destroy many more ozone molecules, leading to significant ozone depletion.
The question asks to identify which statement among the given options is NOT a myth. This means we need to find the statement that is a scientifically or factually correct assertion, while the others are common misconceptions or superstitions.
B) Foods like chips and canned snacks are low in nutrition and should be avoided during adolescence/reproductive phase. This statement is a fact, not a myth. Chips, canned snacks, and other processed foods are generally high in unhealthy fats, sugar, and sodium, and low in essential vitamins, minerals, and fiber. Consuming such foods regularly, especially during critical developmental phases like adolescence and the reproductive phase, can lead to nutritional deficiencies, weight gain, and increased risk of various health problems. Therefore, avoiding them is a sound dietary recommendation.
A) If a girl looks at boys while menstruating, she becomes pregnant. — This is a baseless myth and superstition. Menstruation is a natural biological process in females, and looking at boys has absolutely no connection to pregnancy. Pregnancy occurs through sexual intercourse involving sperm and egg fertilization.
C) The mother is ultimately accountable for her child's sexual orientation. — This is a myth. Sexual orientation is a complex aspect of human identity, influenced by a combination of genetic, hormonal, developmental, and environmental factors. It is not a choice or something that parents, particularly mothers, can control or are accountable for. Blaming parents for a child's sexual orientation is a harmful misconception.
D) During menstruation, a girl should not be permitted to work in the kitchen. — This is a widespread cultural myth and superstition, particularly in some societies. Menstruation is a normal physiological process, and it does not make a person impure or incapable of performing daily activities, including cooking. Such restrictions are discriminatory and lack any scientific basis.
To find the Least Common Multiple (LCM) of a set of numbers, we can use the prime factorization method. This involves finding the prime factors of each number, then taking the highest power of each prime factor present in any of the numbers and multiplying them together.
C) 420 is the Least Common Multiple of 84, 105, and 140.
The question asks to identify the trade organisation that partnered with WWF India to launch the India Plastics Pact in September 2021. This requires knowledge of recent environmental initiatives and the organisations involved.
Correct Option: A) Confederation of Indian Industry
The refractive indices of mediums 1, 2 and 3 are 1.46, 1.65 and 1.31, respectively. If the speed of light in the mediums are v1, v2 and v3, respectively, which of the following relations between them is correct?
v3 > v1 > v2
v2 > v3 > v1
v1 > v2 > v3
v1 = v2 = v3
The problem asks us to compare the speeds of light in three different mediums given their refractive indices. We need to recall the relationship between the refractive index of a medium and the speed of light in that medium.
A) v 3 > v 1 > v 2 — This relation correctly reflects that the speed of light is inversely proportional to the refractive index. Since \(n_3 < n_1 < n_2\), it follows that \(v_3 > v_1 > v_2\).
This problem involves a dishonest shopkeeper using false weights to gain profit. The shopkeeper claims to sell at cost price, but the profit comes entirely from using a lighter weight than what is marked. We can use the formula for percentage gain in such scenarios to find the actual weight used.
Let the actual weight used by the shopkeeper be \(W_{\text{actual}}\) grams.
The shopkeeper pretends to sell 984 gm, so the marked weight (or what is shown to the customer) is \(W_{\text{marked}} = 984 \text{ gm}\).
The gain percentage is given as 23%.
The formula for percentage gain when a false weight is used is:
\[ \text{Gain percentage} = \frac{\text{Error}}{\text{True value} - \text{Error}} \times 100 \]In terms of weights, this can be written as:
\[ \text{Gain percentage} = \frac{\text{Marked Weight} - \text{Actual Weight}}{\text{Actual Weight}} \times 100 \]Alternatively, a simpler and more direct formula for this specific type of problem (where goods are sold at cost price but with false weight) is:
\[ \text{Gain percentage} = \left( \frac{\text{Marked Weight}}{\text{Actual Weight}} - 1 \right) \times 100 \]Let's use this formula.
Substitute the given values into the formula:
\[ 23 = \left( \frac{984}{W_{\text{actual}}} - 1 \right) \times 100 \]Divide both sides by 100:
\[ 0.23 = \frac{984}{W_{\text{actual}}} - 1 \]Add 1 to both sides:
\[ 0.23 + 1 = \frac{984}{W_{\text{actual}}} \] \[ 1.23 = \frac{984}{W_{\text{actual}}} \]Rearrange to solve for \(W_{\text{actual}}\):
\[ W_{\text{actual}} = \frac{984}{1.23} \]Calculate the value:
\[ W_{\text{actual}} = 800 \text{ gm} \]B) The actual measure of the weight used is 800 gm.
Some functions of lymph are given below. Select the option with the correct functions.
a) Carries digested and absorbed fat from intestine
b) Carries CO2 to lungs
c) Carries RBCs to the lymph nodes
d) Drains excess fluid from extracellular space back into blood
The question asks to identify the correct functions of lymph from the given options. We need to evaluate each statement based on the known physiological roles of the lymphatic system.
Based on the analysis, statements (a) and (d) are correct functions of lymph.
A) a and d. Both statements (a) and (d) accurately describe functions of the lymphatic system. Lymphatic capillaries (lacteals) absorb dietary fats from the small intestine, and the lymphatic system is crucial for draining excess interstitial fluid and returning it to the circulation.