NDA Government Jobs Exams

A staircase has 5 steps each 10 cm high and 10 cm wide. What is the minimum horizontal velocity to be
given to the ball so that it hits directly the lowest plane from the top of the staircase ? (g = 10 ms2)

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NDA Other Question

The polarity of an unmarked horse shoe magnet can be determined by using
option
(A) a charged glass rod
(B) a magnetic compass
(C) an electroscope
(D) another unmarked bar magnet Consider the following statements :
1. If a piece of bar magnet is broken into two equally long pieces, the pieces will not lose the magnetic
properties.
2. Magnetic properties of substance lie in the atomic level.
Which of the statements given above is/are correct ?
(A) 1 only (B) 2 only (C) Both 1 and 2 (D) Neither 1 nor 2