Is Bromine Safer Than Chlorine
Yes, bromine is comparatively safer than chlorine. The pH of chlorine is high and is more reactive than bromine. Chlorine... View Article
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Can We Use Potassium Permanganate In Drinking Water
Potassium permanganate can be used in drinking water in the prescribed quantity. It acts as a disinfectant and helps to... View Article
The Sum Of N Terms Of The Series 2 2 Plus 4 2 Plus 62 Is
(1) n(n+1)(2n+1)/6 (2) 2n(n+1)(2n+1)/3 (3) n(n+1)(2n+1)/3 (4) none of these Solution: Given series is 22 + 42 + 62 +..... View Article
The Sum Of N 1 Terms Of 1 Plus 1 Plus 3 Plus 1 Plus 3 Plus 5 Is
(1) n(n+1)(2n+1)/6 (2) n2 (3) n(n-1)(2n-1)/6 (4) none of these Solution: Given series 1 + (1 + 3) + (1... View Article
The Value Of 1 2 2 2 Plus 3 2 4 2 11 2 Is Equal To
(a) 55 (b) 66 (c) 77 (d) 88 Solution: Let S = 12 – 22 + 32 – 42 +….+... View Article
If P And Q Are Positive Real Numbers Such That P2 Plus Q2 Eq 1 Then The Maximum Value Of P Plus Q Is
(1) 2 (2) 1/2 (3) 1/√2 (4) √2 Solution: We know AM ≥ GM. Apply this to p2 and q2... View Article
If The Set Of Natural Numbers Is Partitioned Into Subsets S1 Eq 1 S2 Eq 2 3 S3 Eq 4 5 6 And So On
(1) 62525 (2) 25625 (3) 62500 (4) None of these Solution: Given S1 = {1}, S2 = {2,3}, S3 =... View Article
If A1 A2 An Are Positive Numbers Such That A1 A2 A3 An Eq 1 Then Their Sum Is
(a) a positive integer (b) divisible by n (c) never less than n (d) none of these Solution: We know... View Article
The Sum Of I 2 3i Plus 4 Upto 100 Terms Is
(1) 50(1-i) (2) 25(1+i) (3) 100(1-i) (4) 25i Solution: We know i2 = -1 and i4 = 1 Let S... View Article
2 Power 1 By 4 4power 1 By 16 Equal To
(1) 1 (2) 2 (3) 3/2 (4) 5/2 Solution: 21/4.41/8.81/16.161/32 …= 21/4.(22)1/8.(23)1/16.(24)1/32 = 21/4.21/4.23/16.24/32….. = 21/4 + 2/8 + 3/16... View Article
The Sum Of 1 Plus 2 By 5 Plus 3 By 52 Plus 4 By 53 Upto N Terms Is Eq
(1) (25/16) – (4n+5)/(16.5n-1) (2) (3/4) – (2n+5)/(16.5n-1) (3) (3/7) – (3n+5)/(16.5n-1) (4) (1/2) – (5n+1)/(3.5n+2) Solution: Let S =... View Article
The Nth Term Of The Series 2 Plus 4 Plus 7 Plus 11 Will Be
(1) (n2 + n + 1)/2 (2) n2 + n + 2 (3) (n2 + n + 2)/2 (4) (n2... View Article
If Every Term Of A Gp With Positive Terms Is The Sum Of Its Two Previous Terms Then Common Ratio Of The Series Is
1) 1 2) 2/√5 3) (√5-1)/2 4) (√5+1)/2 Solution: Let a, ar, ar2 be the terms of the GP. Given... View Article
2 Plus 4 Plus 7 Plus 11 Plus 16 N Terms Eq
(1) (⅙)(n2+3n+8) (2) (n/6)(n2+3n+8) (3) (⅙)(n2-3n+8) (4) (n/6)(n2-3n+8) Solution: Let S = 2+4+7+11+16+…n terms Sn-1 = 2+4+7+11+16+…(n-1) terms Tn =... View Article
1 Plus 3 Plus 7 Plus 15 Plus 31 N Terms
(1) 2n+1 – n (2) 2n+1– n – 2 (3) 2n– n – 2 (4) none of these Solution: Let... View Article
The Sum Of The Infinite Terms Of The Following Series 1 Pl 4 By 5 Pl 7 By 5 Sq Plus Will Be
(1) 3/16 (2) 35/8 (3) 35/4 (4) 35/16 Solution: Let S = 1+ 4/5 + 7/52 + 10/53 +…upto ∞... View Article
1 Plus 3 By 2 Plus 5 By 2 2 Plus 7 By 2 3 Plus Infinity Is Equal To
(1) 3 (2) 6 (3) 9 (4) 12 Solution: Let S = 1+ 3/2 + 5/22 + 7/23 +…∞ ..(i)... View Article
If H Be The Harmonic Mean Between A And B Then The Value Of 1 By H A Plus 1 By H B Is
(a) a + b (b) ab (c) 1/a + 1/b (d) 1/a – 1/b Solution: Since H is the HM... View Article
Hm Between The Roots Of The Equation X2 10x 11 Eq 0 Is
(1) 1/5 (2) 5/21 (3) 21/20 (4) 11/5 Solution: Let p and q be the roots of the equation x2-10x+11... View Article
The Harmonic Mean Of A By 1 Ab And A By 1 Plus Ab Is
(a) a/√(1 – a2b2) (b) a/(1 – a2b2 ) (c) a (d) 1/(1 – ab) Solution: HM of x and... View Article
