Pouring of kerosene oil over stagnant water reduces mosquito problems because :

Solution
It interrupts the breathing of larvae
Three bells toll at the intervals of 10. 15 and 24 minutes. All the three begin to toll together at 8 AM. At what time they will again toll together?

Solution
LCM OF 10, 15,24 = 120
Hence, the bells will toll agin after 2 hours at 10 A.M.
A fisherman on the bank of the pond is attempting to spear a fish.
He should:

Solution
Aim below the fish
Which of the following is the largest living mammals?

Solution
Largest living mammal is Blue whale.
Which of the following is used in beauty parlours for hair setting?

Solution
Sulphur
Statement: Should smoking be prohibited.
Argument I : Yes, it is wrong to smoke away millions of money.
Argument U: No, it will throw thousands of workers in tobacco
industry out of employment.Indicate whether:

Solution
Argument II is strong to decide
If the number X 78 Y is divisible by 55 then value of X and Y are:

Solution
A number is divisible by 55 if it is divisible by both 5 and II. A number is divisible by 5, if its unit digit is either 0 or 5 .
∴ Y = 0 or 5
A number is divisible by 11 if sum of digits at odd places and even places separately differ by 0.
If Y = 0, then
X+8=7
⇒ X =  1, which is not possible
If Y = 5
X + 8 = 7+ 5
⇒ X =4
Ram remembers that his brother’s birthday is after fifteenth but before eighteenth of February whereas his sister Kalire members that her brother’s birthday is after sixteenth but befor enineteenth of February. On which day is their brother’s birthday?

Solution
The date lying between 16 February and 18 February is the birth date.
In your bookshelf, you have five favourite books. If you decide to arrange these five books in every possible combination and moved just one book in every half a minute. How much time it will take you to arrange?

Solution
The books can be arranged in
= 5 × 4 × 3 × 2 = 120 ways
Time taken = 1hour
Nimo is 23 years 1 month old, Shyam is 18 years 7 months old and Bano is as much older than Shyam is younger than Nimo.The age of Bano is :

Solution
Let the age of Bano be x years.
As given,
\(x18\frac{7}{12}=23\frac{1}{12}x\)
\(\Rightarrow 2x=18\frac{7}{12}+23\frac{1}{12}\)
\(=(18+23)+\left ( \frac{7}{12}+\frac{1}{12} \right )\)
\(\Rightarrow 2x=41\frac{3}{4}=41\: years\: 9 \: months\)
⇒ x = 20 years 10 months (approx)