The question describes a chemical reaction between barium chloride and ammonium sulphate, forming barium sulphate and ammonium chloride. We need to identify the type of reaction involved from the given options. We will analyze the products formed, especially barium sulphate, to determine the reaction type.
B) Precipitation reaction — As explained above, the formation of insoluble barium sulphate (a precipitate) when two soluble reactants combine in an aqueous solution is the defining characteristic of a precipitation reaction.
The question asks about the placement of "Economic planning" in the lists of the Indian Constitution. To answer this, one needs to recall the Seventh Schedule of the Constitution, which divides legislative powers between the Union and State governments into three lists: Union List, State List, and Concurrent List.
C) Concurrent list — Economic planning is a subject where both the Union and State governments have legislative competence, making it a part of the Concurrent List.
The question asks to identify the plant source from which quinine is derived. Quinine is a well-known antimalarial drug, and its origin is a common piece of general knowledge in competitive exams related to biology, medicine, and general science.
Correct Option: B) Cinchona
Quinine is an alkaloid derived from the bark of the Cinchona tree. It has been used for centuries as an antimalarial drug and also has antipyretic (fever-reducing) and analgesic (pain-relieving) properties. The Cinchona tree is native to the Andes mountains of South America.
The question asks to identify the sport Michael Phelps is famous for. This is a general knowledge question about a well-known athlete.
Correct Option: B) Swimming
The question asks for an alternative name for detergents. We need to understand the fundamental difference between soaps and detergents, particularly their behavior in hard water, to identify the correct term.
A) Soapless soaps is the correct term because detergents provide the cleaning action of soaps but are chemically different and do not form scum in hard water, making them effective even where traditional soaps fail.
The question asks to identify which of the given sports originated in India. This requires knowledge of the historical origins of each sport listed in the options.
Correct Option: C) Kabaddi is an ancient sport that originated in India. It is believed to have roots in ancient India, with various forms of the game being played for thousands of years. It is a popular contact team sport played between two teams of seven players.
To find the distance of the cliff from the person, we need to understand that the sound travels to the cliff and then reflects back to the person. The total time given is for this round trip. We can use the formula: \(\text{Distance} = \text{Speed} \times \text{Time}\).
An echo is heard when sound travels from the source to a reflector (cliff) and then back to the source. Therefore, the total distance covered by the sound is twice the distance between the person and the cliff.
Let \(D_{\text{total}}\) be the total distance traveled by the sound.
\[ D_{\text{total}} = v \times t \] \[ D_{\text{total}} = 344 \text{ m/s} \times 4 \text{ s} \] \[ D_{\text{total}} = 1376 \text{ m} \]Since the total distance is twice the distance to the cliff, let \(d\) be the distance of the cliff from the person.
\[ D_{\text{total}} = 2d \] \[ d = \frac{D_{\text{total}}}{2} \] \[ d = \frac{1376 \text{ m}}{2} \] \[ d = 688 \text{ m} \]Correct Option: D) 688 m
To find the selling price after two successive discounts, we first calculate the price after the first discount, and then apply the second discount on that reduced price. Alternatively, we can use a formula for successive discounts to find the equivalent single discount percentage.
Alternatively, using the successive discount formula:
A) Rs.72.20 is the correct selling price after applying two successive discounts of 5% each.
The question asks about a specific constitutional provision, Article 336, and which community it addresses regarding special provisions for certain services. To answer this, one needs to recall the specific articles related to special provisions for certain classes and communities in the Indian Constitution.
D) Anglo-Indian community — Article 336 of the Indian Constitution specifically provides for special provisions for the Anglo-Indian community in certain services, particularly concerning appointments to posts in connection with the affairs of the Union and of the States for a limited period.
The question asks to identify the mineral essential for bone health. This is a direct knowledge-based question about human nutrition and physiology. We need to recall the primary mineral component of bones.
Correct Option: D) Calcium is the most abundant mineral in the human body and is crucial for the formation and maintenance of strong bones and teeth. About 99% of the body's calcium is stored in the bones and teeth.