The question asks for the method used to detect cracks and flaws in metal blocks. This requires understanding the properties of different sound phenomena and their practical applications in non-destructive testing.
B) Ultrasound is used to detect cracks and flaws in metal blocks. This method, known as ultrasonic testing, relies on the reflection of high-frequency sound waves from internal discontinuities within the material.
The question asks to identify the Harappan city that was primarily dedicated to craft production. To answer this, we need to recall the specific characteristics and primary functions associated with key Harappan sites.
Correct Option: D) Chanhudaro was a small Harappan settlement, distinct from the larger cities, and archaeological evidence points to it being almost exclusively devoted to craft production, including bead making, shell cutting, metal working, seal making, and weight making. It lacked a citadel, further suggesting its primary role was industrial rather than administrative or defensive.
The question asks to identify the physicist after whom the SI unit of sound was named. This requires knowledge of common SI units and the scientists associated with them.
Correct Option: C) Heinrich Rudolf Hertz — The SI unit of frequency, which is a key characteristic of sound, is the hertz (Hz), named after Heinrich Rudolf Hertz. Hertz's work confirmed Maxwell's electromagnetic theory and demonstrated the existence of electromagnetic waves.
This problem involves work and time. We will calculate the individual work rates, the combined work done in the initial period, and then the remaining work. Finally, we will determine the time taken by the remaining person to complete the rest of the work.
Calculate individual work rates:
A can finish the work in 25 days. So, A's one day's work is:
\[ \text{A's 1 day's work} = \frac{1}{25} \]B can finish the work in 20 days. So, B's one day's work is:
\[ \text{B's 1 day's work} = \frac{1}{20} \]Calculate combined work rate:
When A and B work together, their combined one day's work is:
\[ \text{A and B's 1 day's work} = \frac{1}{25} + \frac{1}{20} = \frac{4+5}{100} = \frac{9}{100} \]Calculate work done in 5 days:
They work together for 5 days. So, the total work done in these 5 days is:
\[ \text{Work done in 5 days} = 5 \times \frac{9}{100} = \frac{45}{100} = \frac{9}{20} \]Calculate remaining work:
The total work is considered as 1 unit. The remaining work after A leaves is:
\[ \text{Remaining work} = 1 - \frac{9}{20} = \frac{20-9}{20} = \frac{11}{20} \]Calculate time taken by B to finish remaining work:
After A leaves, B has to finish the remaining work alone. B's one day's work is \(\frac{1}{20}\). The time taken by B to complete the remaining work is:
\[ \text{Time taken by B} = \frac{\text{Remaining work}}{\text{B's 1 day's work}} = \frac{\frac{11}{20}}{\frac{1}{20}} = 11 \text{ days} \]C) 11 days
The question asks to identify an audio file extension from the given options. We need to know the common file extensions for different media types (audio, video, etc.) to answer this correctly.
A) WMA — WMA stands for Windows Media Audio. It is a proprietary audio compression format developed by Microsoft. Files with the .wma extension are specifically audio files.
To find the time taken for a train to cross a bridge, we need to calculate the total distance the train travels, which is the sum of its own length and the length of the bridge. Then, we use the formula \(\text{Time} = \frac{\text{Distance}}{\text{Speed}}\), ensuring all units are consistent.
When a train crosses a bridge, the total distance it covers is its own length plus the length of the bridge.
\[ \text{Total Distance} = \text{Length of Train} + \text{Length of Bridge} \]\[ \text{Total Distance} = 800 \text{ m} + 1200 \text{ m} \]\[ \text{Total Distance} = 2000 \text{ m} \]The speed is given in kilometers per hour (km/h), but the distance is in meters. To ensure consistent units, we convert the speed to meters per second.
\[ \text{Speed} = 120 \text{ km/h} \]\[ \text{Speed in m/s} = 120 \times \frac{5}{18} \text{ m/s} \]\[ \text{Speed in m/s} = \frac{600}{18} \text{ m/s} \]\[ \text{Speed in m/s} = \frac{100}{3} \text{ m/s} \]Now, use the formula \(\text{Time} = \frac{\text{Distance}}{\text{Speed}}\).
\[ \text{Time} = \frac{2000 \text{ m}}{\frac{100}{3} \text{ m/s}} \]\[ \text{Time} = \frac{2000 \times 3}{100} \text{ s} \]\[ \text{Time} = 20 \times 3 \text{ s} \]\[ \text{Time} = 60 \text{ s} \]Since 1 minute = 60 seconds, the time taken is:
\[ \text{Time} = 60 \text{ s} = 1 \text{ minute} \]Correct Option: C) 1 min
The question asks to identify the individual who has NOT served as India's Finance Minister from a given list of options. This requires knowledge of the history of Union Ministers in India, specifically those who held the Finance portfolio.
D) V K Krishna Menon
V. K. Krishna Menon was a prominent Indian politician and diplomat. He served as the Defence Minister of India from 1957 to 1962. He was never the Finance Minister of India.
Prakash remembers that Danish's birthday comes in the last week of February. Rajesh confirms that Danish's birthday comes after 27th February every year. What is Danish's probable date of birth?
27th February
28th February
26th February
29th February
The problem requires us to determine Danish's probable date of birth based on two pieces of information provided by Prakash and Rajesh. We need to find a date that satisfies both conditions.
Correct Option: B) 28th February is the only date that consistently falls in the last week of February and is after 27th February, regardless of whether it's a common year or a leap year. It satisfies both conditions given.
This problem involves a series of transactions with successive percentage gains. We need to work backward from the final price paid by C to find the initial cost for A. We will use the concept of cost price and selling price with percentage gains.
A) ₹400 is the correct answer. The initial cost for A was ₹400.
The problem is a coding-decoding question. We need to identify the pattern or rule used to transform 'MRNQSL' into 'SZXWAV' and then apply the same rule to 'STVZBQ' to find its code.
D) YBFFJA is the correct code derived from applying the identified pattern.