Aapke Sawal Hamare Jawab | Q&A Session With Pooja & Nishtha Ma'am | Class 9th and 10th | Doubtnut

Direction: Study the following information carefully to answer the questions given below Ten boxes are placed in an almirah such that the box which is at lowest place is numbered as 1st, and the box just above it is numbered as 2nd and so on till the topmost box is numbered as 10th position. Four boxes placed between J and K which is placed on an odd numbered position. The box K is placed below the box J. The box M is placed below the box K. Two boxes are placed between K and L which is placed just below Q box. Box B is placed below the box M. Q box is placed on 7th position. The box I is placed on an even numbered position but above the box P. The box A is placed immediate above the box R. Which box is placed at the 9th position?

Satish is 9 ranks ahead of Ajay in the class of 39 students. If Ajay’s rank is 15th from the last, then what is Satish’s rank from the start? सतीश 39 छात्रों की कक्षा में अजय से 9 रैंक आगे है। अगर अजय की रैंक आखरी से 15वीं है, तो सतीश की रैंक शुरू से क्या है?

Two clocks A and B being tested against a standard clock located in the national laboratory At 10.00 AM by the standard clock, the readings of the two clocks are shown in following table {:("Day","Clock A","Clock B"),(I^("st"),10:00:06,8:15:00),(II^("nd"),10:01:13,8:15:0.1),(III^("rd"),9:59:0.8,8:15:04),(IV^("th"),10:02:15,8:14:58),(V^("th"),9:58:10,8:15:02):} If you are doing an experiment that requires precision time interval measurements, which of the two clocks will you prefer ?

Na-amalgam is prepared by electrolysis of NaCl solution using liquid Hg as cathode. How long should the current of 10 amp. Is passed to produce 10% Na-Hg on a cathode of 10 gm Hg. (atomic mass of Na=23 ). (A). 7.77 min (B). 9.44 min. (C). 5.24 min. (D). 11.39 min

Given below are the ages of 40 people in a colony: {:(33,8,7,28,30,25,6,50,24,44),(56,32,27,21,17,62,58,16,14,19),(24,31,27,5,12,46,15,42,67,34),(4,21,10,40,20,50,48,63,9,21):} Taking class intervals 1-10, 11-20, 21-30, 31-40, 41-50, 51-60 and 61-70, we construct a frequency distribution table for th above data.

-16 , 8 , -4 , 2 , . . . , A.M and G.M of p^(th) and q^(th) term are roots of 4x^2-9x+5=0 then p+q=