question_answer1) What are the numbers which have more than two factors called?
A) Even numbers done clear
B) Prime numbers done clear
C) Composite numbers done clear
D) Odd numbers done clear
View Solution play_arrowquestion_answer2) What are the numbers which have only two factors (1 and the number itself) called?
A) Composite numbers done clear
B) Even numbers done clear
C) Prime numbers done clear
D) Odd numbers done clear
View Solution play_arrowquestion_answer3) Which is the number that is neither prime nor composite?
A) 0 done clear
B) 1 done clear
C) 2 done clear
D) 5 done clear
View Solution play_arrowquestion_answer4) Which of the following is the L.C.M. of 36 and 72?
A) 36 done clear
B) 72 done clear
C) 108 done clear
D) 2 done clear
View Solution play_arrowquestion_answer5) What is the L.C.M. of 17 and 5?
A) 105 done clear
B) 95 done clear
C) 85 done clear
D) 5 done clear
View Solution play_arrowquestion_answer6) What is the H.C.F. of 17 and 5?
A) 1 done clear
B) 5 done clear
C) 17 done clear
D) 85 done clear
View Solution play_arrowquestion_answer7) Give an example for twin primes.
A) 5, 11 done clear
B) 3, 5 done clear
C) 11, 17 done clear
D) 3, 7 done clear
View Solution play_arrowquestion_answer8) What is the H.C.F. of two co-prime numbers?
A) 1 done clear
B) 0 done clear
C) 2 done clear
D) 4 done clear
View Solution play_arrowquestion_answer9) Which of the following is an example of an even number?
A) 10351 done clear
B) 20989 done clear
C) 69007 done clear
D) 973572 done clear
View Solution play_arrowquestion_answer10) What is the H.C.F. of 120, 144 and 216 ?
A) 38 done clear
B) 24 done clear
C) 120 done clear
D) 144 done clear
View Solution play_arrowquestion_answer11) What do you get when you multiply two factors?
A) Sum done clear
B) Product done clear
C) Difference done clear
D) Quotient done clear
View Solution play_arrowquestion_answer12) Every number is a _____ and a _____ of itself.
A) factor, multiple done clear
B) prime, composite done clear
C) even, odd done clear
D) prime, twin prime done clear
View Solution play_arrowquestion_answer13) What are the numbers which are multiples of 2 called?
A) Odd numbers done clear
B) Even numbers done clear
C) Prime numbers done clear
D) Composite numbers done clear
View Solution play_arrowquestion_answer14) What is the H.C.F. of the two numbers equal to?
A) Product of the numbers \[\div \] their L.C.M. done clear
B) Product of the numbers \[\times \] their L.C.M. done clear
C) Product of the numbers. done clear
D) Quotient of the numbers. done clear
View Solution play_arrowquestion_answer15) Which of these numbers is a factor of every number ?
A) 0 done clear
B) 1 done clear
C) 2 done clear
D) 4 done clear
View Solution play_arrowquestion_answer16) How many prime numbers are there between 1 and 50?
A) 18 done clear
B) 12 done clear
C) 15 done clear
D) 20 done clear
View Solution play_arrowquestion_answer17) A is the 5th prime number. B is the 7th prime number. What is B - A?
A) 6 done clear
B) 8 done clear
C) 12 done clear
D) 2 done clear
View Solution play_arrowquestion_answer18) What is the number of prime numbers between 50 and 60?
A) 1 done clear
B) 2 done clear
C) 3 done clear
D) 4 done clear
View Solution play_arrowquestion_answer19) Which of the following is the prime factorisation of 140?
A) \[\text{2 }\!\!\times\!\!\text{ 2 }\!\!\times\!\!\text{ 7}\] done clear
B) \[\text{2 }\!\!\times\!\!\text{ 2 }\!\!\times\!\!\text{ 5}\] done clear
C) \[\text{2 }\!\!\times\!\!\text{ 2 }\!\!\times\!\!\text{ 5 }\!\!\times\!\!\text{ 7}\] done clear
D) \[\text{2 }\!\!\times\!\!\text{ 2 }\!\!\times\!\!\text{ 5 }\!\!\times\!\!\text{ 7 }\!\!\times\!\!\text{ 3}\] done clear
View Solution play_arrowquestion_answer20) The successor of every even number is
A) even done clear
B) prime done clear
C) odd done clear
D) composite. done clear
View Solution play_arrowquestion_answer21) What is the sum of the first five multiples of 6?
A) 90 done clear
B) 60 done clear
C) 30 done clear
D) 120 done clear
View Solution play_arrowA) 1394 done clear
B) 1404 done clear
C) 1664 done clear
D) 1406 done clear
View Solution play_arrowA) 1012 done clear
B) 1008 done clear
C) 1015 done clear
D) 1022 done clear
View Solution play_arrowquestion_answer24) What is the greatest 4-digit number exactly divisible by 12, 15, 20 and 35?
A) 9999 done clear
B) 9660 done clear
C) 9832 done clear
D) 9860 done clear
View Solution play_arrowA) 504 done clear
B) 516 done clear
C) 508 done clear
D) 512 done clear
View Solution play_arrowA) 9 done clear
B) 10 done clear
C) 15 done clear
D) 12 done clear
View Solution play_arrowquestion_answer27) A number is always divisible by 90 if
A) it is divisible by both 2 and 45. done clear
B) it is divisible by both 5 and 18. done clear
C) it is divisible by both 9 and 10. done clear
D) All the above. done clear
View Solution play_arrowA) I only done clear
B) II only done clear
C) Both I and II done clear
D) Neither I nor II done clear
View Solution play_arrowquestion_answer29) Which of the following numbers is divisible by 11?
A) 3,116,365 done clear
B) 901,351 done clear
C) 8,790,322 done clear
D) 311,136 done clear
View Solution play_arrowquestion_answer30) Which of the following numbers is a perfect number?
A) 6 done clear
B) 28 done clear
C) 6 and 28 done clear
D) 34 done clear
View Solution play_arrowA) 8 = 1 + 7 done clear
B) 8 = 3 + 5 done clear
C) 4 = 1 + 3 done clear
D) 4 = 2 + 2 done clear
View Solution play_arrowA) 9 done clear
B) 6 done clear
C) 2 done clear
D) 1 done clear
View Solution play_arrowquestion_answer33) The L.C.M. of 64 and 48 is 192.What is the H.C.F. of these numbers?
A) 16 done clear
B) 24 done clear
C) 8 done clear
D) 12 done clear
View Solution play_arrowquestion_answer34) What is the prime factorisation of 143?
A) \[\text{2 }\!\!\times\!\!\text{ 11 }\!\!\times\!\!\text{ 13}\] done clear
B) \[\text{11 }\!\!\times\!\!\text{ 13}\] done clear
C) \[\text{2 }\!\!\times\!\!\text{ 3 }\!\!\times\!\!\text{ 7}\] done clear
D) \[\text{1 }\!\!\times\!\!\text{ 2 }\!\!\times\!\!\text{ 3 }\!\!\times\!\!\text{ 7}\] done clear
View Solution play_arrowA) 13 done clear
B) 26 done clear
C) 104 done clear
D) 143 done clear
View Solution play_arrowA) \[\text{2}\times \text{2}\times \text{2}\times \text{3}\] done clear
B) \[\text{8 }\!\!\times\!\!\text{ 3}\] done clear
C) \[\text{3 }\!\!\times\!\!\text{ 2 }\!\!\times\!\!\text{ 2 }\!\!\times\!\!\text{ 2}\] done clear
D) \[\text{2 }\!\!\times\!\!\text{ 3 }\!\!\times\!\!\text{ 2 }\!\!\times\!\!\text{ 2}\] done clear
View Solution play_arrowquestion_answer37) The table given lists the number of factors for some numbers.
Number | Number of factors |
21 | 4 |
23 | 2 |
25 | 3 |
27 | 4 |
29 | 2 |
A) 0 done clear
B) 2 done clear
C) 3 done clear
D) 4 done clear
View Solution play_arrowquestion_answer38) Find a number which is a multiple of all the numbers from 1 to 10?
A) 5040 done clear
B) 1260 done clear
C) 720 done clear
D) 1440 done clear
View Solution play_arrowquestion_answer39) Observe the following sums. What is the result of the sum 1+3+5+7+9+ ..... +15?
A) 121 done clear
B) 81 done clear
C) 100 done clear
D) 64 done clear
View Solution play_arrowquestion_answer40) How many factors does 48 have?
A) 2 done clear
B) 4 done clear
C) 8 done clear
D) 10 done clear
View Solution play_arrowquestion_answer41) Which of the following is a factor of the number shown on the spike abacus?
A) 10 done clear
B) 7 done clear
C) 5 done clear
D) 8 done clear
View Solution play_arrowA) 2 done clear
B) 4 done clear
C) 6 done clear
D) 8 done clear
View Solution play_arrowquestion_answer43) Which of the following is a prime number?
A) 117 done clear
B) 171 done clear
C) 179 done clear
D) 143 done clear
View Solution play_arrowquestion_answer44) Which of the following is a composite number?
A) 23 done clear
B) 29 done clear
C) 32 done clear
D) 13 done clear
View Solution play_arrowquestion_answer45) Which of the following products is an odd number?
A) \[\text{even }\!\!\times\!\!\text{ odd }\!\!\times\!\!\text{ even}\] done clear
B) \[\text{odd }\!\!\times\!\!\text{ odd }\!\!\times\!\!\text{ even}\] done clear
C) \[\text{even }\!\!\times\!\!\text{ even }\!\!\times\!\!\text{ even}\] done clear
D) \[\text{odd }\!\!\times\!\!\text{ odd }\!\!\times\!\!\text{ odd}\] done clear
View Solution play_arrowA) 34 done clear
B) 37 done clear
C) 39 done clear
D) 33 done clear
View Solution play_arrowquestion_answer47) What is the L.C.M. of 12, 15, 20 and 27?
A) 270 done clear
B) 360 done clear
C) 480 done clear
D) 540 done clear
View Solution play_arrowquestion_answer48) If a and bare co-primes, then what is their L.C.M.?
A) 1 done clear
B) \[\frac{\text{a}}{\text{b}}\] done clear
C) \[\text{ab}\] done clear
D) \[\text{a + b}\] done clear
View Solution play_arrowA) 1 hour done clear
B) \[\text{1}\frac{1}{2}\]hours done clear
C) \[2\frac{1}{2}\] hours done clear
D) 3 hours done clear
View Solution play_arrowA) 999 done clear
B) The greatest 3 digit number. done clear
C) Both [a] and [b] done clear
D) The smallest 3-digit number. done clear
View Solution play_arrowquestion_answer51) The lowest common multiple of 8,16 and p is 48. What is the possible value of p?
A) 64 done clear
B) 24 done clear
C) 2 done clear
D) 32 done clear
View Solution play_arrowA) p done clear
B) r done clear
C) q done clear
D) s done clear
View Solution play_arrowquestion_answer53) The sum of all the prime factors of m is 9. Find the number m.
A) 15 done clear
B) 28 done clear
C) 20 done clear
D) 63 done clear
View Solution play_arrowA) 900 done clear
B) 2500 done clear
C) 1200 done clear
D) 3600 done clear
View Solution play_arrowA) 6 done clear
B) 2 done clear
C) 8 done clear
D) 12 done clear
View Solution play_arrowA) 6 done clear
B) 9 done clear
C) 12 done clear
D) 24 done clear
View Solution play_arrowquestion_answer57) Identify the H.C.F. of the first even number and the fifth composite number.
A) 10 done clear
B) 2 done clear
C) 20 done clear
D) 5 done clear
View Solution play_arrowA) 1200 done clear
B) 120 done clear
C) 1440 done clear
D) 144 done clear
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