{"id":40923,"date":"2024-05-06T08:21:46","date_gmt":"2024-05-06T08:21:46","guid":{"rendered":"https:\/\/edukemy.com\/blog\/?p=40923"},"modified":"2024-05-06T08:21:48","modified_gmt":"2024-05-06T08:21:48","slug":"upsc-prelims-topic-wise-questions-general-mental-ability-mathematical-operations-and-reasoning","status":"publish","type":"post","link":"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-general-mental-ability-mathematical-operations-and-reasoning\/","title":{"rendered":"UPSC PRELIMS TOPIC WISE QUESTION-GENERAL MENTAL ABILITY -MATHEMATICAL OPERATION AND REASONING"},"content":{"rendered":"\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_73 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<label for=\"ez-toc-cssicon-toggle-item-69f12525c31fd\" class=\"ez-toc-cssicon-toggle-label\"><p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-cssicon\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-69f12525c31fd\"  \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-general-mental-ability-mathematical-operations-and-reasoning\/#Q1_In_an_accurate_clock_in_a_period_of_2_h_20_min_140_min_the_minute_hand_will_move_over1996\" title=\"Q1. In an accurate clock, in a period of 2 h 20 min (140 min), the minute hand will move over(1996)\">Q1. In an accurate clock, in a period of 2 h 20 min (140 min), the minute hand will move over(1996)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-general-mental-ability-mathematical-operations-and-reasoning\/#Ans_c\" title=\"Ans. (c)\">Ans. (c)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-general-mental-ability-mathematical-operations-and-reasoning\/#Q2_In_an_office_the_number_of_persons_who_take_tea_is_twice_the_number_of_persons_who_take_only_coffee_The_number_of_persons_who_take_coffee_is_twice_the_number_of_persons_who_take_only_tea_Consider_the_following_statement2006\" title=\"Q2. In an office, the number of persons who take tea is twice the number of persons who take only coffee. The number of persons who take coffee is twice the number of persons who take only tea. Consider the following statement(2006)\">Q2. In an office, the number of persons who take tea is twice the number of persons who take only coffee. The number of persons who take coffee is twice the number of persons who take only tea. Consider the following statement(2006)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-general-mental-ability-mathematical-operations-and-reasoning\/#Ans_b\" title=\"Ans. (b)\">Ans. (b)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-general-mental-ability-mathematical-operations-and-reasoning\/#Q3_A_watch_showed_a_time_of_fourteen_minutes_past_nine_9_hrs_and_14_min_The_positions_of_the_hour-hand_and_the_minute_hand_of_the_watch_are_exactly_interchanged_The_new_time_shown_by_the_watch_is_closest_to_which_one_of_the_following_2006\" title=\"Q3. A watch showed a time of fourteen minutes past nine (9 hrs and 14 min). The positions of the hour-hand and the minute hand of the watch are exactly interchanged. The new time shown by the watch is closest to which one of the following? (2006)\">Q3. A watch showed a time of fourteen minutes past nine (9 hrs and 14 min). The positions of the hour-hand and the minute hand of the watch are exactly interchanged. The new time shown by the watch is closest to which one of the following? (2006)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-general-mental-ability-mathematical-operations-and-reasoning\/#Ans_c-2\" title=\"Ans. (c)\">Ans. (c)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-general-mental-ability-mathematical-operations-and-reasoning\/#Q4_Consider_the_four_age_pyramids_given_below_namely_A_B_C_and_D_representing_four_different_countries2011\" title=\"Q4. Consider the four age pyramids given below namely A, B, C and D representing four different countries.(2011)\">Q4. Consider the four age pyramids given below namely A, B, C and D representing four different countries.(2011)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-general-mental-ability-mathematical-operations-and-reasoning\/#Ans_c-3\" title=\"Ans. (c)\">Ans. (c)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-general-mental-ability-mathematical-operations-and-reasoning\/#Q5_Consider_the_following_figure_and_answer_the_question_that_follows2011\" title=\"Q5. Consider the following figure and answer the question that follows(2011)\">Q5. Consider the following figure and answer the question that follows(2011)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-general-mental-ability-mathematical-operations-and-reasoning\/#Q6_Four_friends_A_B_C_and_D_distribute_some_money_among_themselves_in_such_a_manner_that_A_gets_one_less_than_B_C_gets_5_more_than_D_D_gets_3_more_than_B_Who_gets_the_smallest_amount_2013\" title=\"Q6. Four friends, A, B, C and D distribute some money among themselves in such a manner that A gets one less than B, C gets 5 more than D, D gets 3 more than B. Who gets the smallest amount? (2013)\">Q6. Four friends, A, B, C and D distribute some money among themselves in such a manner that A gets one less than B, C gets 5 more than D, D gets 3 more than B. Who gets the smallest amount? (2013)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-general-mental-ability-mathematical-operations-and-reasoning\/#Ans_a\" title=\"Ans. (a)\">Ans. (a)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-general-mental-ability-mathematical-operations-and-reasoning\/#Q7_Four_persons_Alok_Bhupesh_Chander_and_Dinesh_have_a_total_of_100_among_themselves_Alok_and_Bhupesh_between_them_have_as_much_money_as_Chander_and_Dinesh_between_them_but_Alok_has_more_money_than_Bhupesh_and_Chander_has_only_half_the_money_that_Dinesh_has_Alok_has_in_fact_5_more_than_Dinesh_has_Who_has_the_maximum_amount_of_money2004\" title=\"Q7. Four persons, Alok, Bhupesh, Chander and Dinesh have a total of 100 among themselves. Alok and Bhupesh between them have as much money as Chander and Dinesh between them but Alok has more money than Bhupesh, and Chander has only half the money that Dinesh has. Alok has in fact 5 more than Dinesh has. Who has the maximum amount of money?(2004)\">Q7. Four persons, Alok, Bhupesh, Chander and Dinesh have a total of 100 among themselves. Alok and Bhupesh between them have as much money as Chander and Dinesh between them but Alok has more money than Bhupesh, and Chander has only half the money that Dinesh has. Alok has in fact 5 more than Dinesh has. Who has the maximum amount of money?(2004)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-general-mental-ability-mathematical-operations-and-reasoning\/#Ansa\" title=\"Ans.(a)\">Ans.(a)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-general-mental-ability-mathematical-operations-and-reasoning\/#Q9_Each_of_A_B_C_and_D_has_100_A_pays_20_to_B_who_pays_10_to_C_who_gets_30_from_D_In_this_context_which_one_of_the_following_statements_is_not_correct_2015\" title=\"Q9. Each of A, B, C and D has 100. A pays 20 to B, who pays 10 to C, who gets 30 from D. In this context, which one of the following statements is not correct? (2015)\">Q9. Each of A, B, C and D has 100. A pays 20 to B, who pays 10 to C, who gets 30 from D. In this context, which one of the following statements is not correct? (2015)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-general-mental-ability-mathematical-operations-and-reasoning\/#Ans_c-4\" title=\"Ans. (c)\">Ans. (c)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-general-mental-ability-mathematical-operations-and-reasoning\/#Q10_There_are_some_nectar-filled_flowers_on_a_tree_and_some_bees_are_hovering_on_it_If_one_bee_land_on_each_flower_one_bee_will_be_left_out_If_two_bees_land_oneach_flower_one_bee_will_be_left_out_If_two_bees_land_on_each_flower_one_flower_will_be_left_out_The_number_of_flowers_and_bees_respectively_are2016\" title=\"Q10. There are some nectar-filled flowers on a tree and some bees are hovering on it. If one bee land on each flower, one bee will be left out. If two bees land oneach flower, one bee will be left out. If two bees land on each flower, one flower will be left out. The number of flowers and bees respectively are(2016)\">Q10. There are some nectar-filled flowers on a tree and some bees are hovering on it. If one bee land on each flower, one bee will be left out. If two bees land oneach flower, one bee will be left out. If two bees land on each flower, one flower will be left out. The number of flowers and bees respectively are(2016)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-general-mental-ability-mathematical-operations-and-reasoning\/#Ans_c-5\" title=\"Ans. (c)\">Ans. (c)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-general-mental-ability-mathematical-operations-and-reasoning\/#Q11_The_monthly_average_salary_paid_to_all_the_employees_of_a_company_was_5000_The_monthly_average_salary_paid_to_male_and_female_employees_was_5200_and_4200_respectively_Then_the_percentage_of_males_employed_in_the_company_is_2016\" title=\"Q11. The monthly average salary paid to all the employees of a company was 5000. The monthly average salary paid to male and female employees was 5200 and 4200, respectively. Then, the percentage of males employed in the company is (2016)\">Q11. The monthly average salary paid to all the employees of a company was 5000. The monthly average salary paid to male and female employees was 5200 and 4200, respectively. Then, the percentage of males employed in the company is (2016)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-general-mental-ability-mathematical-operations-and-reasoning\/#Ans_b-2\" title=\"Ans. (b)\">Ans. (b)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-general-mental-ability-mathematical-operations-and-reasoning\/#In_case_you_still_have_your_doubts_contact_us_on_9811333901\" title=\"In case you still have your doubts, contact us on 9811333901.&nbsp;\">In case you still have your doubts, contact us on 9811333901.&nbsp;<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-general-mental-ability-mathematical-operations-and-reasoning\/#Visit_our_YouTube_Channel_%E2%80%93_here\" title=\"Visit our YouTube Channel &#8211;&nbsp;here\">Visit our YouTube Channel &#8211;&nbsp;here<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q1_In_an_accurate_clock_in_a_period_of_2_h_20_min_140_min_the_minute_hand_will_move_over1996\"><\/span>Q1. In an accurate clock, in a period of 2 h 20 min (140 min), the minute hand will move over(1996)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>(a) 520\u00b0<br>(b) 320\u00b0<br>(c) 840\u00b0<br>(d) 140<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ans_c\"><\/span>Ans. (c)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Exp. The angle which minute hand move over in 60 min = 360\u00b0 360\u00b0 =6\u00b0 So, angle made by minute hand in minute 60 So, in a period of 2 h 20 min (2\u00d760+20=) 140 min the minute hand will move over = 6 x 140\u00b0=840\u00b0<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q2_In_an_office_the_number_of_persons_who_take_tea_is_twice_the_number_of_persons_who_take_only_coffee_The_number_of_persons_who_take_coffee_is_twice_the_number_of_persons_who_take_only_tea_Consider_the_following_statement2006\"><\/span>Q2. In an office, the number of persons who take tea is twice the number of persons who take only coffee. The number of persons who take coffee is twice the number of persons who take only tea.<br>Consider the following statement(2006)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>1.The sum of the number of persons who take either tea or coffee or both is four times the number of persons who take both coffee and tea.<\/p>\n\n\n\n<p>2.The sum of the number of persons who take only coffee and those who take only tea is twice the number of persons who take both tea and coffee.                                                         <\/p>\n\n\n\n<p>Which of the statement(s) given above is\/are correct?<br>(a) Only 1<br>(c) Only 2<br>(b) Both 1 and 2 <br>(d) Neither 1 nor <\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ans_b\"><\/span>Ans. (b)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Exp. Let the number of only tea takers be x, number of only coffee takers be y and number of both tea and coffee takers be z.<br>According to the question, x+z=2y (i) Valdiary+z=2xollol. (ii) From Eqs. (i) and (ii), x = y = z x+y+z=z+z+z=3z Thus, Statement 1 is not correct. Also, x + y = z+z=2z<br>Thus, Statement 2 is correct<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q3_A_watch_showed_a_time_of_fourteen_minutes_past_nine_9_hrs_and_14_min_The_positions_of_the_hour-hand_and_the_minute_hand_of_the_watch_are_exactly_interchanged_The_new_time_shown_by_the_watch_is_closest_to_which_one_of_the_following_2006\"><\/span>Q3. A watch showed a time of fourteen minutes past nine (9 hrs and 14 min). The positions of the hour-hand and the minute hand of the watch are exactly interchanged. The new time shown by the watch is closest to which one of the following?<br>(2006)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>(a) Twelve minutes to three<br>(b) Thirteen minutes to three <br>(c) Fourteen minutes to three                                                                                                                                                           (d) Fifteen minutes to three<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ans_c-2\"><\/span>Ans. (c)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Exp. Given, angle rotated by hour hand at time 9 : 1400                                                                                                                              =9&#215;30\u00b0 +14 x 30\u00b0 60 = 270+7=277\u00b0<br>When hour and minute hand interchange their position, then time when minutes hand rotated by                                      277\u00b0= 277\u00b0\/6= =46.16  min 46 min 6                                                                                                                                                   so new time will be 14 min to go three according to the question<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"296\" height=\"271\" src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2024\/05\/image-51.png\" alt=\"\" class=\"wp-image-40929\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img decoding=\"async\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2024\/05\/image-52.png\" alt=\"\" class=\"wp-image-40930 lazyload\" width=\"403\" height=\"235\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 403px; --smush-placeholder-aspect-ratio: 403\/235;\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q4_Consider_the_four_age_pyramids_given_below_namely_A_B_C_and_D_representing_four_different_countries2011\"><\/span>Q4. Consider the four age pyramids given below namely A, B, C and D representing four different countries.(2011)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"533\" height=\"210\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2024\/05\/image-54.png\" alt=\"\" class=\"wp-image-40932 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 533px; --smush-placeholder-aspect-ratio: 533\/210;\" \/><\/figure>\n\n\n\n<p>Which one of them indicates the declining population? (2011)<br>(a) A<br>(b)) B<br>(c) C<br>(d) D<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ans_c-3\"><\/span>Ans. (c)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Exp. Declining population means greater number of death rate that is narrower upper part and lower number of birth rate that is narrower base.<br>These conditions are satisfied by C.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q5_Consider_the_following_figure_and_answer_the_question_that_follows2011\"><\/span>Q5. Consider the following figure and answer the question that follows(2011)<br><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"315\" height=\"203\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2024\/05\/image-55.png\" alt=\"\" class=\"wp-image-40934 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 315px; --smush-placeholder-aspect-ratio: 315\/203;\" \/><\/figure>\n\n\n\n<p><br>In the figure shown above, OP, and OP2 are two plane mirrors kept perpendicular to each other, Sis the direction of a beam of light falling on the mirror OP. The direction of the reflected beam of light from the mirror OP2 will be<br>(a) perpendicular to the direction S<br>(b) at 45\u00b0 to the direction S<br>(c) opposite and parallel to the direction S<br>(d) at 60\u00b0 to the direction S<\/p>\n\n\n\n<p>Ans. (c<\/p>\n\n\n\n<p>Exp. The reflected ray from mirror OP, will be parallel but opposite to the direction of S.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"265\" height=\"220\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2024\/05\/image-56.png\" alt=\"\" class=\"wp-image-40935 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 265px; --smush-placeholder-aspect-ratio: 265\/220;\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q6_Four_friends_A_B_C_and_D_distribute_some_money_among_themselves_in_such_a_manner_that_A_gets_one_less_than_B_C_gets_5_more_than_D_D_gets_3_more_than_B_Who_gets_the_smallest_amount_2013\"><\/span>Q6. Four friends, A, B, C and D distribute some money among themselves in such a manner that A gets one less than B, C gets 5 more than D, D gets 3 more than B. Who gets the smallest amount? (2013)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>(a) A<br>(b) B<br>(c) C<br>(d) D<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ans_a\"><\/span>Ans. (a)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Exp. Let the amount of money with A bea, B beb, C bec and with D bed.<br>Given that a=b-1, c-d+5, d= b +3. Now, c = d + 5 = b + 8. Hence, only A gets less than b and no one else gets less than b. Which means that A gets the smallest amount.: ball-moon emo<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q7_Four_persons_Alok_Bhupesh_Chander_and_Dinesh_have_a_total_of_100_among_themselves_Alok_and_Bhupesh_between_them_have_as_much_money_as_Chander_and_Dinesh_between_them_but_Alok_has_more_money_than_Bhupesh_and_Chander_has_only_half_the_money_that_Dinesh_has_Alok_has_in_fact_5_more_than_Dinesh_has_Who_has_the_maximum_amount_of_money2004\"><\/span>Q7. Four persons, Alok, Bhupesh, Chander and Dinesh have a total of 100 among themselves. Alok and Bhupesh between them have as much money as Chander and Dinesh between them but Alok has more money than Bhupesh, and Chander has only half the money that Dinesh has. Alok has in fact 5 more than Dinesh has. Who has the maximum amount of money?(2004)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>(a) Alok<br>(b) Bhupesh<br>(c) Chander<br>(d) Dinesh<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ansa\"><\/span>Ans.(a)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Exp. 4 persons, i.e. Alok, Bhupesh, Chander and Dinesh have<br>\u20b9100.<br>Now, Alok and Bhupesh between them have as much money as Chander and Dinesh. and Alok + Bhupesh = 50 Chander + Dinesh = 50 Now, Alok has more money than Bhupesh Alok > Bhupesh and Chander has only half the money that Dinesh has Dinesh Chander It is given Alok has 5 more than Dinesh Alok > Dinesh From Eq. (i), (ii) and (iii), we have following order Alok > Dinesh > Chander or Bhupesh So, Alok has maximum amount of money.<\/p>\n\n\n\n<p>Q8. Twelve people form a club. By picking lots, one of them will host a dinner for all once in a month. The number of dinners a particular member has to host in 1 yr is<br>(2015<\/p>\n\n\n\n<p>(a) one                                       (b) zero                                                                                                                                              (c) three                                     (d) cannot be predicted  <\/p>\n\n\n\n<p>Since in picking lots a single host can be repeated multiple times. So, we cannot predicted the number of dinners that a particular member has to host in 1 yr.                                                                                   <\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q9_Each_of_A_B_C_and_D_has_100_A_pays_20_to_B_who_pays_10_to_C_who_gets_30_from_D_In_this_context_which_one_of_the_following_statements_is_not_correct_2015\"><\/span>Q9. Each of A, B, C and D has 100. A pays 20 to B, who pays 10 to C, who gets 30 from D. In this context, which one of the following statements is not correct? (2015)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>(a) C is the richest<br>(b) D is the poorest<br>(c) C has more than what A and D have together                                                                                                                                 (d) B is richer than <\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ans_c-4\"><\/span>Ans. (c)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Exp. According to the given information, each of A, B, C and D has 100.<br>So, A&#8217;s amount = 100-20 = 80<br>B&#8217;s amount=100+20-10 = 110<br>C&#8217;s amount=100+10+30=140<br>D&#8217;s amount=100-30 = 70<br>From the above, it is clear that statement of option (c) is not correct.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q10_There_are_some_nectar-filled_flowers_on_a_tree_and_some_bees_are_hovering_on_it_If_one_bee_land_on_each_flower_one_bee_will_be_left_out_If_two_bees_land_oneach_flower_one_bee_will_be_left_out_If_two_bees_land_on_each_flower_one_flower_will_be_left_out_The_number_of_flowers_and_bees_respectively_are2016\"><\/span>Q10. There are some nectar-filled flowers on a tree and some bees are hovering on it. If one bee land on each<br>flower, one bee will be left out. If two bees land oneach flower, one bee will be left out. If two bees land on each flower, one flower will be left out. The number of flowers and bees respectively are(2016)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>(a) 2 and 4<br>(b) 3 and 2<br>(c) 3 and 4<br>(d) 4 and <\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ans_c-5\"><\/span>Ans. (c)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Exp. Going through all the choices, If number of flowers = 3 and number of bees = 4 Then, the given conditions are satisfied<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q11_The_monthly_average_salary_paid_to_all_the_employees_of_a_company_was_5000_The_monthly_average_salary_paid_to_male_and_female_employees_was_5200_and_4200_respectively_Then_the_percentage_of_males_employed_in_the_company_is_2016\"><\/span>Q11. The monthly average salary paid to all the employees of a company was 5000. The monthly average salary paid to male and female employees was 5200 and 4200, respectively. Then, the percentage of males employed in the company is (2016)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>(a) 75%<br>(b) 80%<br>(c) 85%<br>(d) 90%<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ans_b-2\"><\/span>Ans. (b)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>EXP. Let the number of male and female employees be x and y, respectively. salary = 5000<br>Given, monthly average Monthly average salary of male employees = 5200                                                                         Monthly average salary of female employees = 4200                                                                                                                 According to question                                                                                                                                                                          5000(X+Y)=5200X+4200Y                                                                                                                                5000X+5000Y=5200X 4200Y                                                                                                                                               200X=800Y, X=4Y                                                                                                                                                                                 Required percenrtage =X\/X+Y*100%=X+X\/4*100%=4X\/5X*100%=80%<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><a href=\"https:\/\/edukemy.com\/upsc\/upsc-essay?utm_source=Blog&amp;utm_medium=Banner&amp;utm_campaign=Essay\" target=\"_blank\" rel=\"noreferrer noopener\"><img decoding=\"async\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2024\/06\/UPSC-Essay-Course-1280\u00d7300-1-3.svg\" alt=\"\" class=\"wp-image-42688 lazyload\" width=\"781\" height=\"182\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 781px; --smush-placeholder-aspect-ratio: 781\/182;\" \/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"block-c6ab63ae-7083-4831-b519-cb89dacafb18\"><span class=\"ez-toc-section\" id=\"In_case_you_still_have_your_doubts_contact_us_on_9811333901\"><\/span><strong>In case you still have your doubts, contact us on 9811333901.<\/strong>&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p id=\"block-52c5a91b-6ed6-46e3-b781-7cc0c63a0b76\">For UPSC Prelims Resources,&nbsp;<a href=\"https:\/\/edukemy.com\/upsc-cse-prelims-resource-centre\" target=\"_blank\" rel=\"noreferrer noopener\">Click here<\/a><\/p>\n\n\n\n<p id=\"block-d014fe86-d628-49d8-82ce-6c60dc6e7a73\">For Daily Updates and Study Material:<\/p>\n\n\n\n<p id=\"block-38177954-e668-4d8d-b250-d0fbd5a09390\">Join our Telegram Channel &#8211;&nbsp;<a href=\"https:\/\/t.me\/WithEdukemy4IAS\" target=\"_blank\" rel=\"noreferrer noopener\">Edukemy for IAS<\/a><\/p>\n\n\n\n<ul class=\"wp-block-list\" id=\"block-49ca2fe3-109f-4a88-b72e-9df49c3d328e\"><li>1. 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