List of practice Questions

Match the following errors (Column 1) in spatial data digitization with their descriptions (Column 2).

Column 1	Column 2
(P) Mis-located entities	2) Points, lines or boundary segments digitized in wrong place
(Q) Missing labels	4) Undefined polygons
(R) Artefacts of digitization	3) Undershoots, overshoots, wrongly placed nodes, loops or spikes
(S) Duplicate labels	5) Two or more identification labels for same polygon
(T) Duplicate entities	1) Points, lines or boundary segments digitized twice

To visually distinguish between a river channel and a canal on an image, having similar widths and located in the same area, the most important parameter used is _______________

For a push-broom sensor, the following details are given:
Number of detectors = 3000
Height above the ground = 900 km
Swath on the ground = 30 km
The spatial resolution of the sensor is _____ m.

In active remote sensing of Earth objects from a satellite-borne sensor, the source of the energy used for sensing, lies at the _____________

What are the Manhattan and Pythagorean distances (in m), respectively between points A and B in the figure below, where the Euclidean distance between A and C is 4 m, and the Euclidean distance between C and B is 4 m? All the cells have the same edge lengths.

Human beings are one among many creatures that inhabit an imagined world. In this imagined world, some creatures are cruel. If in this imagined world, it is given that the statement “Some human beings are not cruel creatures” is FALSE, then which of the following set of statement(s) can be logically inferred with certainty?
(i) All human beings are cruel creatures.
(ii) Some human beings are cruel creatures.
(iii) Some creatures that are cruel are human beings.
(iv) No human beings are cruel creatures.

In 2022, June Huh was awarded the Fields medal, which is the highest prize in Mathematics.
When he was younger, he was also a poet. He did not win any medals in the International Mathematics Olympiads. He dropped out of college.
Based only on the above information, which one of the following statements can be logically inferred with certainty?

A line of symmetry is defined as a line that divides a figure into two parts in a way such that each part is a mirror image of the other part about that line.
The given figure consists of 16 unit squares arranged as shown. In addition to the three black squares, what is the minimum number of squares that must be coloured black, such that both $PQ$ and $MN$ form lines of symmetry? (The figure is representative)

In the given figure, PQRS is a parallelogram with PS = 7 cm, PT = 4 cm and PV = 5 cm. What is the length of RS in cm? (The diagram is representative.)