Question
A train takes 18 seconds to cross a 120-metre-long
platform. If the speed of the train is 36 km/h, then find the time taken by the train to cross a 240-metre-long bridge.Solution
Let the length of the train be 'x' metres.
And speed of the train = 36 X (5/18) = 10 m/s
So, {(x + 120) /10} = 18
Or, x + 120 = 180
So, x = 60
So, required time = {(240 + 60) /10} = 30 seconds
Which of the following best defines the concept of the "Internet of Things" (IoT)?
Which schema in data warehousing uses a central fact table connected to dimension tables?
Data warehouse metadata primarily describes:
Which type of slowly changing dimension (SCD) preserves full history by adding a new row for each change and using effective date ranges?
Which of these is NOT an ensemble method?
In a snowflake schema of a data warehouse, which of the following consequences is most likely as a result of normalization of dimension tables?
Which OLAP operation involves focusing on a subset of dimensions (e.g., region=‘Asia’)?
ETL stands for:
Which SQL keyword is used to combine results from two queries and remove duplicates?
Data cleansing is primarily concerned with: