The word(s) "trial" appears 37 time(s) in 36 verse(s) in Quran in Mohsin Khan translation.

(1) And (remember) when We delivered you from Fir'aun's (Pharaoh) people, who were afflicting you with a horrible torment, killing your sons and sparing your women, and therein was a mighty trial from your Lord.

(2) They followed what the Shayatin (devils) gave out (falsely of the magic) in the lifetime of Sulaiman (Solomon). Sulaiman did not disbelieve, but the Shayatin (devils) disbelieved, teaching men magic and such things that came down at Babylon to the two angels, Harut and Marut, but neither of these two (angels) taught anyone (such things) till they had said, "We are only for trial, so disbelieve not (by learning this magic from us)." And from these (angels) people learn that by which they cause separation between man and his wife, but they could not thus harm anyone except by Allah's Leave. And they learn that which harms them and profits them not. And indeed they knew that the buyers of it (magic) would have no share in the Hereafter. And how bad indeed was that for which they sold their ownselves, if they but knew.

(3) Or think you that you will enter Paradise without such (trials) as came to those who passed away before you? They were afflicted with severe poverty and ailments and were so shaken that even the Messenger and those who believed along with him said, "When (will come) the Help of Allah?" Yes! Certainly, the Help of Allah is near!

(4) It is He Who has sent down to you (Muhammad صلى الله عليه وسلم) the Book (this Qur'an). In it are Verses that are entirely clear, they are the foundations of the Book [and those are the Verses of Al-Ahkam (commandments), Al-Fara'id (obligatory duties) and Al-Hudud (legal laws for the punishment of thieves, adulterers)]; and others not entirely clear. So as for those in whose hearts there is a deviation (from the truth) they follow that which is not entirely clear thereof, seeking Al-Fitnah (polytheism and trials), and seeking for its hidden meanings, but none knows its hidden meanings save Allah. And those who are firmly grounded in knowledge say: "We believe in it; the whole of it (clear and unclear Verses) are from our Lord." And none receive admonition except men of understanding. (Tafsir At-Tabari).

(5) And when you (Muslims) travel in the land, there is no sin on you if you shorten As-Salat (the prayer) if you fear that the disbelievers may put you in trial (attack you etc.), verily, the disbelievers are ever unto you open enemies.

(6) They thought there will be no Fitnah (trial or punishment), so they became blind and deaf; after that Allah turned to them (with Forgiveness); yet again many of them became blind and deaf. And Allah is the All-Seer of what they do.

(7) O you who believe! Allah will certainly make a trial of you with something in (the matter of) the game that is well within the reach of your hands and your lances, that Allah may test him who fears Him unseen. Then whoever transgresses thereafter, for him there is a painful torment.

(8) And (remember) when We rescued you from Fir'aun's (Pharaoh) people, who were afflicting you with the worst torment, killing your sons and letting your women live. And in that was a great trial from your Lord.

(9) And Musa (Moses) chose out of his people seventy (of the best) men for Our appointed time and place of meeting, and when they were seized with a violent earthquake, he said: "O my Lord, if it had been Your Will, You could have destroyed them and me before; would You destroy us for the deeds of the foolish ones among us? It is only Your trial by which You lead astray whom You will, and keep guided whom You will. You are our Wali (Protector), so forgive us and have Mercy on us: for You are the Best of those who forgive.

(10) And ask them (O Muhammad صلى الله عليه وسلم) about the town that was by the sea; when they transgressed in the matter of the Sabbath (i.e. Saturday): when their fish came to them openly on the Sabbath day, and did not come to them on the day they had no Sabbath. Thus We made a trial of them, for they used to rebel against Allah's Command (disobey Allah) [see the Qur'an: V.4:154 and its footnote].