Which of the following statements are true? (i) `16 : 24=20\ : 30` (ii) `21\ :6=35\ : 10` (iii) `12 : 18=28 : 12` (iv) `51 : 58=85 : 102` (v) `40\ m e n\ : 200\ m e n=R s .5\ : R s .25` (vi) `99\ kg\ : 45\ kg=R s .44\ : R s .20`

Write True ( T ) or False ( F ) against each of the following statements :(a) 16 : 24 :: 20 : 30 (b) 21: 6 :: 35 : 10 (c) 12 : 18 :: 28 : 12(d) 8 : 9 :: 24 : 27 (e) 5.2 : 3.9 :: 3 : 4 (f) 0.9 : 0.36 :: 10 : 4

Which of the following triplets are Pythagorean? (I) (8,\ 15 , 17) (ii) (18 ,\ 80 , 82) (iii) (14 , 48 , 51) (iv) (10 , 24 , 26) (16 , 63 , 65) (vi) (12 , 35 , 38)

Find the sum of the following series: 9+99+999+ to\ n\ t e r m s

Find the sum of the following series: 0. 6+0. 66+0. 666 to\ n\ t e r m s

Find the sum of the following series: 0. 5+0. 55+0. 555+ to\ n\ t e r m s

P Q R S is a quadrilateral. P R\ a n d\ Q S intersect each other O . In which of the following cases, P Q R S is a parallelogram? (i) _∠P = 100°, ∠Q = 80°, ∠R = 95° (ii) /_P=85^0,\ /_Q=85^0,\ /_R=95^0 (iii) P Q=7C M ,\ Q R=7C M ,\ R S=8C M ,\ S P=8C M (iv) O P=6. 5 c m ,\ O Q=6. 5 c m ,\ O R=5. 2 c m ,\ O S=5. 2 c m

Classify the following measures as scalars and vectors (i) 20 m north-west (ii) 10 newton (iii) 30 km/h (iv) 50m/s towards north (v) 10^(-19) coloumb

Check validity of following statement (i) r : Sky is blue and water is colourless (ii) s : 102 is multiple of 2 and 51 (iii) t : 2 is even and compositive mnumber

Classify the following measures as scalars and vectors.(i) 10 kg (ii) 2 meters north-west (iii) 40^@ (iv) 40 watt (v) 10^19 coulomb (vi)20 m//s^2

If the ratio of second to seventh of n A.M.'s between -7 and 65 is 1:7, then n is equal to (i) 10 (ii) 11 (iii) 12 (iv) 13