Onisation of the given number,
index of 23 and index of 5 1.
The wmaller of 3 and 1 is.3.
Therefore, the number of zeroes in the end of the given number is three.
MULTIPLE CHOICE QUESTIONS
Choose the correct answer from the given four options (1 to 29);
1.535 can be expressed as a product of primes as
b) 5x 3 x 72
(c) 52 x 3 x 7 (d) 52 x 32 x 7
2. TICF of 168 and 252 is
la 28
(b) 42
(c) 84
(d) 504
3. HICT XLCN for the numbers 50 and 20 is
(b) 100
(C) 1000
(d) 50 (CBSE 2013)
4. IFLICE (72, 120) = 24, then LCM (72, 120) is
(0) 240
(b) 360
(c) 1728
(d) 2880
5. Given that LCM (91, 26) = 182, then HCF (91, 26) is
(b) 26
(c) 17
(d) 9
6. If the HCF and LCM of two natural numbers are 12 and 180, and one of the numbers is
36, then the other number is
(a) 510
(b) 180
(c) 60
(d) 12
18 Basic Mathematics-X
Answers
Answer:
1. A ratio equivalent to 3 : 7 is:
(i) 3 : 9; (ii) 6 : 10; (iii) 9 : 21; (iv) 18 : 49
2. The ratio 35 : 84 in simplest form is:
(i) 5 : 7; (ii) 7 : 12; (iii) 5 : 12; (iv) none of these
3. In a class there are 20 boys and 15 girls. The ratio of boys to girls is:
(i) 4 : 3; (ii) 3 : 4; (iii) 4 : 5; (iv) none of these
4. Two numbers are in the ratio 7 : 9. If the sum of the numbers is 112, then the larger number is:
(i) 49; (ii) 72; (iii) 63; (iv) 42
5. The ratio of 1.5 m to 10 cm is:
(i) 1 : 15; (ii) 15 : 10; (iii) 10 : 15; (iv) 15 : 1
6. The ratio of 1 hour to 300 seconds is:
(i) 1 : 12; (ii) 12 : 1; (iii) 1 : 5; (iv) 5 : 1
7. In 4 : 7 : : 16 : 28, 7 and 16 are called
(i) extreme terms; (ii) middle terms; (iii) b middle and c extreme term; (iv) none of these
8. The first, second and fourth terms of a proportion are 16, 24 and 54 respectively. Then the third term is:
(i) 36; (ii) 28; (iii) 48; (iv) 32
9. If 12, 21, 72, 126 are in proportion, then:
(i) 12 × 21 = 72 × 126; (ii) 12 × 72 = 21 × 126; (iii) 12 × 126 = 21 × 72; (iv) none of these
10. If x, y and z are in proportion, then:
(i) x : y : : z : x; (ii) x : y : : y : z; (iii) x : y : : z : y; (iv) x : z : : y : z