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IIT JEE Exam 2021 : Pace : AITS MAINS 3 (SOLVED)

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Aquaman- King of the Seven Seas
Iit Jee, India
XI,XII Science

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AITS 16 (Main) Physics PART (A) : PHYSICS SINGLE CORRECT ANSWER TYPE This section contains 20 multiple choice questions. Each question has 4 options (A), (B), (C) and (D) for its answer, out of which ONLY ONE option can be correct. Marking scheme: +4 for correct answer, 0 if not attempted and 1 in all other cases. 1. A box is put on a scale which is adjusted to read zero when the box is empty. A stream of pebbles is then poured into the base from a height h above its bottom at a rate of n pebbles. Each pebble has a mass m. If the pebbles collide with the box such that they immediately come to rest after collision then the scale reading at time t after the pebbles begin to fill the box is [neglect piling up of pebbles] (B) mn 2gh gt (C) mngt (A) mnt 1. (D) Zero (B) Scale reading will be the sum of weight and force due to their impulse m mnt g Scale reading v t 2ghmn mngt mn 2. A particle of mass m is suspended from a ceiling through a string of length L .The particle moves in a horizontal circle of radius r .The speed (v) of the particle and the tension (T) in the string is (A) v (C) v 2. 2gh gt 2r g L 2 r 2 12 3r g L 2 r 2 12 and T 3mgL L 2 r 2 12 and (B) v (D) v r g L 2 r 2 14 r g L 2 r 2 14 and T and T L mgL 2 L r2 12 mgL 2 r2 12 (D) The situation is shown in the diagram .The angle mode by the string with the vertical is given by r sin L The forces on the particle are (1) The tension T along the string and (2) The weight mg vertically downward CENTERS : MUMBAI /DELHI /AKOLA /LUCKNOW /NASHIK /PUNE /NAGPUR /BOKARO /DUBAI # 1

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