Question
A train of 250 metres is moving at a speed of 90 km/h.
It completely crosses a platform in 45 seconds. What is the platform’s length?Solution
ATQ,
Let the length of the platform be ‘x’ metres
Speed of the train = 90 × (5/18) = 25 m/s
ATQ,
(x + 250) = 25 × 45
Or, (x + 250) = 1125
Or, x = 1125 - 250
Or, x = 875
Therefore, the length of the platform = 875 metres
In the context of a relational database, which of the following is NOT a characteristic of a candidate key ?
A surrogate key is:
Which schema in data warehousing uses a central fact table connected to dimension tables?
Which of these is NOT an ensemble method?
What is meant by 'cardinality' in data modeling?
Which OLAP operation allows users to view data at different levels of granularity?
Which of the following best describes a fact constellation schema in a data warehouse?
Fact constellation schema is best described as:
In OLAP, “Slice and Dice” means:
Which of the following best defines the concept of the "Internet of Things" (IoT)?
