{"id":44050,"date":"2021-01-11T14:35:46","date_gmt":"2021-01-11T09:05:46","guid":{"rendered":"https:\/\/cracku.in\/blog\/?p=44050"},"modified":"2021-01-11T14:35:46","modified_gmt":"2021-01-11T09:05:46","slug":"top-20-rrb-ntpc-clock-based-questions","status":"publish","type":"post","link":"https:\/\/cracku.in\/blog\/top-20-rrb-ntpc-clock-based-questions\/","title":{"rendered":"Top-20 RRB NTPC  Clock Based Questions"},"content":{"rendered":"<h1><strong>RRB NTPC Clock Based Questions<\/strong><\/h1>\n<p>Download Top-20 Clock Based questions for RRB NTPC\u00a0 exam. Most important\u00a0 Clock Based\u00a0 questions based on asked questions in previous exam papers for RRB NTPC.<\/p>\n<p class=\"text-center\"><a href=\"https:\/\/cracku.in\/downloads\/11411\" target=\"_blank\" class=\"btn btn-danger  download\">Download Top-20 RRB NTPC Clock Based Questions<\/a><\/p>\n<p class=\"text-center\"><a href=\"https:\/\/cracku.in\/pay\/9lBoT\" target=\"_blank\" class=\"btn btn-info \">Get 20 RRB NTPC Mocks &#8211; Just Rs. 149<\/a><\/p>\n<p>Take a<a href=\"https:\/\/cracku.in\/rrb-ntpc-mock-test\"> free RRB NTPC mock test<\/a><\/p>\n<p>Download<a href=\"https:\/\/cracku.in\/railways-ntpc-previous-papers\"> RRB NTPC Previous Papers PDF<\/a><\/p>\n<p><b>Question 1:\u00a0<\/b>Find the angle between the hour hand and the minute hand of a clock when the time is 10.25 hours i.e. 25 minutes past 10 ?<\/p>\n<p>a)\u00a0180\u00b0<\/p>\n<p>b)\u00a0165\u00b0<\/p>\n<p>c)\u00a0$162\\frac{1}{2}\u00b0$<\/p>\n<p>d)\u00a0$152\\frac{1}{2}\u00b0$<\/p>\n<p><b>Question 2:\u00a0<\/b>Three bells ring at intervals of 15, 20 and 30 minutes respectively. If they all ring at 11.00 a.m. together, at what lime will &#8216; they next ring together?<\/p>\n<p>a)\u00a011.30 a.m.<\/p>\n<p>b)\u00a012 noon<\/p>\n<p>c)\u00a012.30 p.m.<\/p>\n<p>d)\u00a01.00 p.m.<\/p>\n<p><b>Question 3:\u00a0<\/b>At a telephone exchange, three phones ring at intervals of 20 sec, 24 sec and 30 seconds. If they ring together at 11:25 a.m, when will they next ring together?<\/p>\n<p>a)\u00a011:29 a.m.<\/p>\n<p>b)\u00a011:27 am.<\/p>\n<p>c)\u00a011:51 a.m.<\/p>\n<p>d)\u00a012:29 p.m.<\/p>\n<p><b>Question 4:\u00a0<\/b>A clock shows 2 am now Find the total rotation of the minute hand, in degrees, of the clock when it will show 9 pm on the same night?<\/p>\n<p>a)\u00a08600\u00b0<\/p>\n<p>b)\u00a06840\u00b0<\/p>\n<p>c)\u00a06470\u00b0<\/p>\n<p>d)\u00a05930\u00b0<\/p>\n<p><b>Question 5:\u00a0<\/b>Alarms from 3 different clocks sound after every 2, 4 and 6 hours, respectively. If the clocks are started at the same time, how many times do the alarms ring together in 3 days?<\/p>\n<p>a)\u00a06<\/p>\n<p>b)\u00a03<\/p>\n<p>c)\u00a09<\/p>\n<p>d)\u00a02<\/p>\n<p><b>Question 6:\u00a0<\/b>If the number 1 on the clock is replaced by the letter \u2018M\u2019, the number 2 is replaced by \u2018N\u2019<br \/>\nand so on, then when thetime is 21:00 p.m. the hour hand will be at &#8230;&#8230;&#8230;. letter.<\/p>\n<p>a)\u00a0T<\/p>\n<p>b)\u00a0S<\/p>\n<p>c)\u00a0V<\/p>\n<p>d)\u00a0U<\/p>\n<p><b>Question 7:\u00a0<\/b>What is the angle between the two hands of a clock when the time shown by the clock is 8 p.m.?(in degrees)<\/p>\n<p>a)\u00a0240<\/p>\n<p>b)\u00a0120<\/p>\n<p>c)\u00a060<\/p>\n<p>d)\u00a050<\/p>\n<p><b>Question 8:\u00a0<\/b>How many times in a week does both the hands of the clock will coincide with each other?<\/p>\n<p>a)\u00a084<\/p>\n<p>b)\u00a0160<\/p>\n<p>c)\u00a056<\/p>\n<p>d)\u00a0154<\/p>\n<p><b>Question 9:\u00a0<\/b>Praneet started his journey at 2:45:46 p.m. and reached the destination at 4:55:57 p.m. Anit started the journey 58 mins 40secs after Praneet and reached his destination 50 mins 29 secs after him. How long did Anit take to complete his journey?<\/p>\n<p>a)\u00a02 hours 2 seconds<\/p>\n<p>b)\u00a02 hours 2 minutes<\/p>\n<p>c)\u00a01 hour 59 minutes<\/p>\n<p>d)\u00a02 hours 1 minute 12 seconds<\/p>\n<p><b>Question 10:\u00a0<\/b>If the hour hand of a clock moves by $18^\\circ$ then by how many degrees does the minute hand move during the same time?<\/p>\n<p>a)\u00a0168<\/p>\n<p>b)\u00a0216<\/p>\n<p>c)\u00a0276<\/p>\n<p>d)\u00a0196<\/p>\n<p class=\"text-center\"><a href=\"https:\/\/t.me\/crackubanking\" target=\"_blank\" class=\"btn btn-info \">Join Exam Preparation Telegram Group<\/a><\/p>\n<p>&nbsp;<\/p>\n<p><b>Question 11:\u00a0<\/b>What is the measure of the smaller of the two angles formed between the hour hand and the minute hand of a clock when it is 5:49 p.m.?<\/p>\n<p>a)\u00a0$119^\\circ$<\/p>\n<p>b)\u00a0$119.5^\\circ$<\/p>\n<p>c)\u00a0$120^\\circ$<\/p>\n<p>d)\u00a0$120.5^\\circ$<\/p>\n<p><b>Question 12:\u00a0<\/b>What will be the acute angle between the hour-hand and the minute-hand at 2:13 p.m?<\/p>\n<p>a)\u00a0$16.5^\\circ$<\/p>\n<p>b)\u00a0$18^\\circ$<\/p>\n<p>c)\u00a0$13.5^\\circ$<\/p>\n<p>d)\u00a0$12^\\circ$<\/p>\n<p><b>Question 13:\u00a0<\/b>In a week, how many times are the hands of clock at right angles with each other?<\/p>\n<p>a)\u00a0308<\/p>\n<p>b)\u00a044<\/p>\n<p>c)\u00a024<\/p>\n<p>d)\u00a0154<\/p>\n<p><b>Question 14:\u00a0<\/b>What would be the smaller of the two angles formed by the hour hand and the minute hand at 3:47 p.m.?<\/p>\n<p>a)\u00a0$168.5^{0}$<\/p>\n<p>b)\u00a0$162^{0}$<\/p>\n<p>c)\u00a0$166.5^{0}$<\/p>\n<p>d)\u00a0$165^{0}$<\/p>\n<p><b>Question 15:\u00a0<\/b>What is the measure of the smaller of the two angles formed between the hour hand and<br \/>\nthe minute hand of a clock when it is 6:44 p.m.?<\/p>\n<p>a)\u00a0$\u00a062.5^\\circ$<\/p>\n<p>b)\u00a0$\u00a062^\\circ $<\/p>\n<p>c)\u00a0$ 84^\\circ $<\/p>\n<p>d)\u00a0$ 83.5^\\circ $<\/p>\n<p class=\"text-center\"><a href=\"https:\/\/cracku.in\/pay\/9lBoT\" target=\"_blank\" class=\"btn btn-info \">Get 20 RRB NTPC Mocks &#8211; Just Rs. 149<\/a><\/p>\n<p><b>Question 16:\u00a0<\/b>What will be the measure of the acute angle formed between the hour hand and the minute hand at 6:43 a.m.?<\/p>\n<p>a)\u00a0$\u00a021.5^\\circ $<\/p>\n<p>b)\u00a0$ 78^\\circ $<\/p>\n<p>c)\u00a0$ 56^\\circ $<\/p>\n<p>d)\u00a0$ 56.5^\\circ $<\/p>\n<p><b>Question 17:\u00a0<\/b>What would be the smaller of the two angles formed by the hour hand and the minute hand at 4 : 52 p.m.?<\/p>\n<p>a)\u00a0$\u00a0162^\\circ $<\/p>\n<p>b)\u00a0$\u00a0164.5^\\circ $<\/p>\n<p>c)\u00a0$\u00a0165^\\circ $<\/p>\n<p>d)\u00a0$\u00a0166^\\circ $<\/p>\n<p><b>Question 18:\u00a0<\/b>A watch loses 5 minutes every hour and was set right at 6 a.m. on a Monday. When will it<br \/>\nshow the correct time again?<\/p>\n<p>a)\u00a06 a.m. on next Sunday<\/p>\n<p>b)\u00a03 a.m. on next Monday<\/p>\n<p>c)\u00a03 a.m. on next Sunday<\/p>\n<p>d)\u00a06 a.m. on next Monday<\/p>\n<p><b>Question 19:\u00a0<\/b>What is the obtuse angle formed by the hands of a clock when the time in the clock is 2:30?<\/p>\n<p>a)\u00a0$95^\\circ$<\/p>\n<p>b)\u00a0$120^\\circ$<\/p>\n<p>c)\u00a0$105^\\circ$<\/p>\n<p>d)\u00a0$165^\\circ$<\/p>\n<p><b>Question 20:\u00a0<\/b>A clock is found to be slow by 5 minutes at 8 AM on Sunday. It started gaining time and was found to be 5 minutes fast at 8 PM on Monday. When was it correct?<\/p>\n<p>a)\u00a08 AM, Monday<\/p>\n<p>b)\u00a02 AM, Monday<\/p>\n<p>c)\u00a06 AM, Monday<\/p>\n<p>d)\u00a08 PM, Monday<\/p>\n<p class=\"text-center\"><a href=\"https:\/\/cracku.in\/railways-ntpc-previous-papers\" target=\"_blank\" class=\"btn btn-info \">Download RRB NTPC Previous Papers<\/a><\/p>\n<p><span style=\"text-decoration: underline;\"><strong>Answers &amp; Solutions:<\/strong><\/span><\/p>\n<p><strong>1)\u00a0Answer\u00a0(C)<\/strong><\/p>\n<p>In every hour , hour hand covers $30^\\circ$.<\/p>\n<p>So, at 10:25 pm , angle covered by hour hand will be ,<\/p>\n<p>$ \\frac{30 \\times 125\u00a0}{12} = 312.5^\\circ$<\/p>\n<p>In every hour , minute hand will cover\u00a0$360^\\circ$<\/p>\n<p>So, at 10:25 pm , angle covered by minute hand will be ,<\/p>\n<p>$60 \\times 25\u00a0 = 150^\\circ$<\/p>\n<p>angle between the hour hand and the minute hand of a clock = $312.5^\\circ &#8211;\u00a0150^\\circ$ =\u00a0$162\\frac{1}{2}\u00b0$<\/p>\n<p>So, the answer would be option c)$162\\frac{1}{2}\u00b0$<\/p>\n<p><strong>2)\u00a0Answer\u00a0(B)<\/strong><\/p>\n<p>LCM of 15, 20, 30 = 60<\/p>\n<p>After each 60 minutes they will ring together.<\/p>\n<p>Hence they next ring together at 12 noon .<\/p>\n<p><strong>3)\u00a0Answer\u00a0(B)<\/strong><\/p>\n<p>We will\u00a0take the LCM of 20, 24, 30, which is 120.<\/p>\n<p>It tells us that they will together after an interval of 120 seconds = 2 minutes.<\/p>\n<p>So, at 11:27 a.m they will next ring together.<\/p>\n<p><strong>4)\u00a0Answer\u00a0(B)<\/strong><\/p>\n<p><strong>5)\u00a0Answer\u00a0(A)<\/strong><\/p>\n<p>If we take the LCM of\u00a02, 4 and 6 hours then got 12 hours.<\/p>\n<p>In\u00a012 hours alarms ring\u00a0simultaneously once.<\/p>\n<p>It means\u00a012 hours = 1.<\/p>\n<p>Hence 3 days = 72\u00a0hours = 6.<\/p>\n<p><strong>6)\u00a0Answer\u00a0(D)<\/strong><\/p>\n<p><strong>7)\u00a0Answer\u00a0(B)<\/strong><\/p>\n<p>The total angle in a clock is\u00a0360\u00b0.<\/p>\n<p>The minute hand covers this\u00a0360\u00b0 in 60 minutes. Thus ,for every minute\u00a0it covers\u00a06\u00b0.<\/p>\n<p>The hour hand covers this\u00a0360\u00b0 in 12 hour. Thus ,for every hour it covers\u00a030\u00b0.<\/p>\n<p>So, in 8 hour ,the hour hand will cover\u00a0$8\\times30\u00b0=240\u00b0.$<\/p>\n<p>So, the difference between hour hand and minute hand at 8 p.m will be =\u00a0$\\left(360\u00b0-240\u00b0\\right)=120\u00b0.$<\/p>\n<p>So, option B is correct .<\/p>\n<p><strong>8)\u00a0Answer\u00a0(D)<\/strong><\/p>\n<p>AM : 12:00, 1:05, 2:11, 3:16,4:22, 5:27, 6:33, 7:38, 8:44, 9:49, 10:55.<\/p>\n<p>PM: 12:00, 1:05, 2:11, 3:16, 4:22, 5:27, 6:33, 7:38, 8:44, 9:49, 10:55.<\/p>\n<p>So, both the hands coincide with each other for 22 times in a day.<\/p>\n<p>Now,<\/p>\n<p>For 1 day = 22 times.<\/p>\n<p>For 1 week = 22 * 7<\/p>\n<p>= &gt; 154 times.<\/p>\n<p><strong>9)\u00a0Answer\u00a0(B)<\/strong><\/p>\n<p>Praneet started his journey at 2:45:46 pm<\/p>\n<p>Anit started 58 minutes 40 secs later<\/p>\n<p>so the time would be 2:45:46 + 0:58:40 = 3:44:26 pm (since 60 sec is 1 minute and 60 minute = 1 hour)<\/p>\n<p>Praneet reaches at 4:55:57 pm<\/p>\n<p>and Anit reaches 0:50:29 after him<\/p>\n<p>so the reaching time would be 4:55:57+0:50:29 = 5:46:26 pm<\/p>\n<p>now the time taken by Anit is 5:46:26 &#8211; 3:44:26 = 2:02:00<\/p>\n<p>Hence the time taken by Anit is 2 hours and 2 mins<\/p>\n<p><strong>10)\u00a0Answer\u00a0(B)<\/strong><\/p>\n<p>The hour hand of a clock moves by 30 deg when the minute had moved through 360 deg. Hence if the hour hand moves 18 deg, then the minute hand moves by $\\frac{360\\times18}{30}$ = 216 deg<\/p>\n<p class=\"text-center\"><a href=\"https:\/\/www.youtube.com\/channel\/UCMDJPaiDdRPv2mrEJoLfklA\" target=\"_blank\" class=\"btn btn-primary \">Free RRB Preparation Videos<\/a><\/p>\n<p><strong>11)\u00a0Answer\u00a0(B)<\/strong><\/p>\n<p>The hour hand moves 360 degrees every 12 hours. At 5:49, its angle is $(5 + \\frac{49}{60}) \\times\\frac{ 360}{12} = 174.5 degrees$<\/p>\n<p>The minute hand moves 360 degrees each 60 minutes, so at 15 minutes past the hour it has moved $\\frac{49}{60} \\times 360 = 294 degrees.$<\/p>\n<p>Thus, the difference between the two hands is 294 &#8211; 174.5 = 119.5 degrees.<\/p>\n<p><strong>12)\u00a0Answer\u00a0(D)<\/strong><\/p>\n<p>angle covered by minute hand in 1 minute is 6degree and angle covered by hour hand in 1minute is $\\frac {1}{2}$ degree.<\/p>\n<p>So, angle covered by minute hand at 13minutes = $13\\times 6degree$ = 78degree.<\/p>\n<p>Hence, at 2hours 13minutes\u00a0 = 133 x $\\frac {1}{2}$degree = 66degree.<\/p>\n<p>Hence, the angle between the hour and minute hand at 2.13PM = 78degree &#8211; 66degree = $12^\\circ$<\/p>\n<p><strong>13)\u00a0Answer\u00a0(A)<\/strong><\/p>\n<p>If you switch to a rotating coordinate system in which the hour hand stands still, then the minute hand makes only 11 revolutions, and so it is at right angles with the hour hand <strong>22 times<\/strong>. In a 24 hour day you get $2\\times 22= 44$<\/p>\n<p>so in weekthere are 7 days<\/p>\n<p>so,<\/p>\n<p>$7\\times 44= 308 times$<\/p>\n<p><strong>14)\u00a0Answer\u00a0(A)<\/strong><\/p>\n<p>The minute hand moves 6 degrees per minute. (That\u2019s 360 degrees divided by 60 minutes)<\/p>\n<p>The hour hand moves one-twelfth that, or $\\frac{1}{2}$ degree per minute.<\/p>\n<p>So the angle between the minute and hour hand increases by 5.5 degrees every minute.<\/p>\n<p>The minute and hour hand start together at noon.<\/p>\n<p>It takes 227 minutes(60+60+60+47) to get to 3:47 . So in this time, the angle between the hour and minute hand has increased $227\\times 5.5$ degrees.<\/p>\n<p>$227\\times 5.5$= 1248.5 degrees.<\/p>\n<p>Which is the same as 168.5 degrees.(1 cicrle is 360 so in 1248.5 deg\u00a0 there are 3 circle and 168.5 deg left)<\/p>\n<p><strong>15)\u00a0Answer\u00a0(B)<\/strong><\/p>\n<p>A clock is a circle, and a circle always contains 360 degrees. Since there are 60 minutes on a clock, each minute mark is 6 degrees.<\/p>\n<p>$\\frac{360^\\circ total}{60 minutes total}=6^\\circ per\u00a0 minute$<\/p>\n<p>The minute hand on the clock will point at 44 minutes, allowing us to calculate it&#8217;s position on the circle.<\/p>\n<p>(44 min)(6)=$264^\\circ$<\/p>\n<p>Since there are 12 hours on the clock, each hour mark is 30 degrees.<\/p>\n<p>$\\frac{360^\\circ total}{12 hours total}=30^\\circ per\u00a0 hour$<\/p>\n<p>We can calculate where the hour hand will be at 6:00.<\/p>\n<p>$(6 hr)(30)=180^\\circ$<\/p>\n<p>However, the hour hand will actually be <em>between<\/em> the 6 and 7, since we are looking at 6:44 rather than an absolute hour mark. 44 minutes is equal to $\\frac{44}{60}$th of an hour. Use the same equation to find the additional position of the hour hand.<\/p>\n<p>$180^\\circ + \\frac{44}{60} \\times 30 = 202^\\circ$<\/p>\n<p>We are looking for the smaller angle between the two hands of the clock. The will be equal to the difference between the two angle measures.<\/p>\n<p>Required answer = $264^\\circ &#8211; 202^\\circ = 62^\\circ$<\/p>\n<p>So, the answer would be option b)$ 62^\\circ $.<\/p>\n<p class=\"text-center\"><a href=\"https:\/\/cracku.in\/pay\/9lBoT\" target=\"_blank\" class=\"btn btn-info \">Get 20 RRB NTPC Mocks &#8211; Just Rs. 149<\/a><\/p>\n<p class=\"text-center\"><a href=\"https:\/\/cracku.in\/rrb-ntpc-mock-test\" target=\"_blank\" class=\"btn btn-alone \">Take RRB NTPC Free Mock Test<\/a><\/p>\n<p><strong>16)\u00a0Answer\u00a0(D)<\/strong><\/p>\n<p>A clock is a circle, and a circle always contains 360 degrees. Since there are 60 minutes on a clock, each minute mark is 6 degrees.<\/p>\n<p>$\\frac{360^\\circ total}{60 minutes total}=6^\\circ\u00a0per minute$<\/p>\n<p>The minute hand on the clock will point at 43 minutes, allowing us to calculate it&#8217;s position on the circle.<\/p>\n<p>(43 min)(6)=$258^\\circ$<\/p>\n<p>Since there are 12 hours on the clock, each hour mark is 30 degrees.<\/p>\n<p>$\\frac{360^\\circ total}{12 hours total}=30^\\circ per hour$<\/p>\n<p>We can calculate where the hour hand will be at 6:00.<\/p>\n<p>$(6 hr)(30)=180^\\circ$<\/p>\n<p>However, the hour hand will actually be <em>between<\/em> the 6 and 7, since we are looking at 6:43 rather than an absolute hour mark. 43 minutes is equal to $\\frac{43}{60}$th of an hour. Use the same equation to find the additional position of the hour hand.<\/p>\n<p>$180^\\circ + \\frac{43}{60} \\times 30 = 201.5^\\circ$<\/p>\n<p>We are looking for the acute angle between the two hands of the clock. The will be equal to the difference between the two angle measures.<\/p>\n<p>Required answer = $258^\\circ &#8211; 201.5^\\circ = 56.5^\\circ$<\/p>\n<p>So, the answer would be option b)$ 56.5^\\circ $.<\/p>\n<p><strong>17)\u00a0Answer\u00a0(D)<\/strong><\/p>\n<p><strong>18)\u00a0Answer\u00a0(A)<\/strong><\/p>\n<p>For the watch to show the correct time again, it should lose 12 hours.<br \/>\nIt loses 5 minutes in 1 hour.<br \/>\n\u21d2 It loses 1 minute in 12 minutes.<br \/>\n\u21d2 It will lose 12 hours (or 720 minutes) in 720 \u00d7 12 minutes = 8640 minutes = 144 hours = 6 days.<br \/>\n\u21d2Thus, the clock will show the correct time again at 6am on next Sunday.<\/p>\n<p>So , the answer would be option a)\u00a06 a.m. on next Sunday.<\/p>\n<p><strong>19)\u00a0Answer\u00a0(C)<\/strong><\/p>\n<p>Angle between the hands of a clock is given by the formula $\\dfrac{11}{2}H &#8211; 30M$ or $30M &#8211; \\dfrac{11}{2}H$ where H is hours and M is minutes.<br \/>\nHere, Given time = 02 : 30, H = 2 and M = 30.<br \/>\nAngle = $\\dfrac{11}{2} \\times 30 &#8211; 30 \\times 2 = 165 &#8211; 60 &#8211; 105^\\circ$<\/p>\n<p><strong>20)\u00a0Answer\u00a0(B)<\/strong><\/p>\n<p class=\"text-center\"><a href=\"https:\/\/t.me\/crackubanking\" target=\"_blank\" class=\"btn btn-info \">Join Exam Preparation Telegram Group<\/a><\/p>\n<p class=\"text-center\"><a href=\"https:\/\/play.google.com\/store\/apps\/details?id=in.cracku.app&amp;hl=en_IN&amp;gl=IN\" target=\"_blank\" class=\"btn btn-danger \">Download RRB Preparation App<\/a><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>RRB NTPC Clock Based Questions Download Top-20 Clock Based questions for RRB NTPC\u00a0 exam. Most important\u00a0 Clock Based\u00a0 questions based on asked questions in previous exam papers for RRB NTPC. Take a free RRB NTPC mock test Download RRB NTPC Previous Papers PDF Question 1:\u00a0Find the angle between the hour hand and the minute hand [&hellip;]<\/p>\n","protected":false},"author":53,"featured_media":44039,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_mi_skip_tracking":false,"footnotes":""},"categories":[31,3171,1603],"tags":[4361,1625,1593],"class_list":{"0":"post-44050","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-railways","8":"category-railways-en","9":"category-rrb-ntpc","10":"tag-clock-based","11":"tag-maths","12":"tag-rrb-ntpc"},"better_featured_image":{"id":44039,"alt_text":"Top 20 RRB NTPC Clock Based Questions","caption":"Top-20  RRB NTPC Clock Based Questions ","description":"Top-20  RRB NTPC Clock Based Questions 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