Select the option that will replace the question mark (?) in the following series.
The problem requires identifying the pattern in a series of diagrams and selecting the correct option that logically follows the sequence.
The correct arrangement matches option B, where the symbols have been rotated correctly according to the identified pattern.
Correct Option: B) The symbols are rotated clockwise by one quadrant.
The question states that Pallavi's house faces East, that a gallery lies to the right-hand side on entering, and that a balcony lies 90° clockwise from the gallery. We need to find the direction a person faces on entering the house, locate the gallery, and then turn 90° clockwise to find the balcony's direction.
Identify the given information:
Find the direction faced on entering:
Since the entrance faces East, a person entering the house walks in from the East side and therefore faces West.
Locate the gallery:
When a person faces West, the right-hand side is North. So, the gallery is towards the North.
Turn 90° clockwise from the gallery:
Moving 90° clockwise from North gives East.
\[ \text{North} \xrightarrow{90^\circ\ \text{clockwise}} \text{East} \]Therefore, the balcony faces East.
Correct Option: A) East — On entering an East-facing house, one faces West, so the gallery on the right is towards the North. A 90° clockwise turn from North gives East. Hence, Option A is the correct answer.
B) North: This is incorrect because North is the direction of the gallery itself, not of the balcony after a 90° clockwise turn.
C) South: This is incorrect because South is reached by a 180° turn from North, not a 90° clockwise turn.
D) West: This is incorrect because West is the direction faced on entering the house; a 90° clockwise turn from North gives East.
If Rs 6,000 is invested at the rate of 20% per annum, compounded half-yearly, then the amount after 18 months will be:
The question asks to identify the active bleaching agent present in bleaching powder. Bleaching powder is a chemical compound known for its disinfecting and bleaching properties. Understanding its chemical composition is key to answering this question.
C) Chlorine is the active bleaching agent present in bleaching powder. Bleaching powder (\( \text{CaOCl}_2 \)) releases chlorine or hypochlorite ions, which are responsible for its bleaching action due to their strong oxidizing properties.
The question asks to identify the international hockey tournament where both Indian men's and women's teams secured the top position in 2017. This requires knowledge of major hockey tournament results for that specific year.
Correct Option: B) The Asia Cup
The question asks to identify the term for heat trapped inside the Earth's surface. This requires knowledge of different types of energy sources and their definitions.
Correct Option: C) Geo-thermal energy is derived from the heat stored beneath the Earth's surface. This heat is a result of the Earth's formation and ongoing radioactive decay of minerals.
To find the total height of the stack of books, we need to multiply the number of books by the thickness of each book. This is a straightforward multiplication problem.
Total height = Number of books \(\times\) Thickness of each book
\[ \text{Total height} = 47 \text{ books} \times 2 \text{ cm/book} \]\[ \text{Total height} = 94 \text{ cm} \]Correct Option: D) 94 cm
The speed of sound depends on the properties of the medium through which it travels. Specifically, it is influenced by the elasticity (or stiffness) and density of the medium. We need to compare these properties for solids, liquids, and gases to determine where sound travels fastest.
A) Solids — Sound travels fastest in solids because their particles are tightly packed and strongly bonded, allowing vibrations to be transmitted very efficiently and quickly. Solids have the highest elasticity (bulk modulus) compared to liquids and gases.
This question tests the understanding of the reactivity series of metals. A more reactive metal can displace a less reactive metal from its salt solution. We need to compare the reactivity of copper and zinc.
Correct Option: C) No reaction takes place
Find the odd one out.
| A | B | C | D |
| X22 | W23 | A1 | D4 |
The question gives four letter-number terms, A = X22, B = W23, C = A1 and D = D4. We need to check whether the number in each term matches the position of its letter in the English alphabet and identify the term that does not follow this pattern.
Identify the given information:
Recall the alphabet positions of the letters:
X = 24, W = 23, A = 1 and D = 4.
Compare each number with its letter's position:
W23: W = 23, which matches. A1: A = 1, which matches. D4: D = 4, which matches.
X22: X = 24, but the number given is 22, which does not match.
Correct Option: D) A — The term X22 is the odd one out because X is the 24th letter, not the 22nd. Hence, Option D is the correct answer.
A) C: This is incorrect because in A1, A is the 1st letter, so it follows the pattern.
B) D: This is incorrect because in D4, D is the 4th letter, so it follows the pattern.
C) B: This is incorrect because in W23, W is the 23rd letter, so it follows the pattern.