Biomagnification implies

Solution
Biomagnification is the sequence of processes in an ecosystem by which higher concentrations of a particular chemical such as the pesticide DDT, are reached in organisms higher up the food chain.
‘Plague’ is caused by________.

Solution
Plague is caused by bacteria. It is a deadly infectious disease caused by the enterobacteria yersiniapestis, named after the FrenchSwiss bacteriologist Alexander Yersin.
The orientation of an atomic orbital is governed by

Solution
Quantum numbers may be defined as a set of four numbers which give complete information about the electron in an atom, ie, energy, orbital occupied, size, shape and orientation of that orbital and the direction of electron spin. Magnetic quantum number is required to explain the fact that when the source giving the line spectrum is placed in a magnetic field, each spectral line splits into a number of lines. The magnetic quantum number tells the number of orientations which the orbitals present within the same subshell can take up.
Silicon is a

Solution
Silicon is a chemical element with the symbol Si and its atomic number is 14. Over 90 per cent of the Earth's crust is composed of silicate minerals. Highly purified silicon is used in semiconductor electronics.
Wage fund theory was propounded by
Which one of the following is a water borne disease?
Teachers’ Day is observed every year on
When was the First General Election to the Lok Sabha held?
Who among the following was the pioneer of Yoga?
From my house I walked 5 km towards North. I turned right and walked 3 km. Again I went one km to the South. How far am I from my house?

Solution
AD = \(sqrt{left ( 4 right )^{2} + left ( 3 right )^{2}} = 5 km\)
There are three baskets of fruits. First basket has twice the number of fruits in the second basket. Third basket has ^{3}⁄_{4} th of the fruits in the first. The average of the fruits in all the baskets is 30. What is the number of fruits in the first basket?

Solution
Let the number of fruits in the first basket be x
∴ No. of fruits in second basket = ^{x}⁄_{2}
and no. of fruits in third basket = ^{3x}⁄_{4}
Now, according to the question,
x + ^{x}⁄_{2} + ^{3x}⁄_{4} = 3 × 30
⇒ \(frac{4x + 2x + 3x}{4} = 90\)
∴ x = 90 × ^{4}⁄_{9} = 40
The five permanent members of the United Nations Security Council are

Solution
The five permanent members of UN Security Council are
(1) China
(2) France
(3) Russia
(4) UK and
(5) USA
‘Rath Yatra’ at Puri is celebrated in honour of
As per the provisional result of the 2011 Census the density of population in India is
‘Multinational’ is
Varahamihira is

Solution
Varahmihir (505587), was an Indian astronomer and astrologer who lived in Ujjain. He is considered to be one of the nine jewels of the court of legendry ruler Vikramaditya.
LCM of ^{2}⁄_{3}, ^{4}⁄_{9}, ^{5}⁄_{6} is

Solution
Required LCM = \(frac{LCM ;;of ;; 2, ; 4, ; 5}{HCF ;; of ;; 3, ; 9, ; 6} = frac{20}{3}\)
If a number is as much greater than 31 as it is less than 75, then the number is

Solution
Let the number be x.
Now, according to the question,
x  31 = 75  x
⇒ 2x = 75 + 31 = 106 ⇔ x = 53
The average of 30 numbers is 40 and that of other 40 numbers is 30. The average of all the numbers is

Solution
Average of all numbers
\(frac{30 times 40 times 40 times 30}{70} = frac{240}{7} = 34frac{2}{7}\)
A sum becomes Rs 2,916 in 2 years at 8% per annum compound interest. The simple interest at 9% per annum for 3 years on the same amount will be

Solution
Let the sum be Rs x.
A = P(1 + ^{R}⁄_{100})^{T}
⇒ 2916 = x(1 + ^{8}⁄_{100})^{2}
⇒ 2916 = x(^{27}⁄_{25})^{2}
⇒ x = \(frac{2916 times 25 times 25}{27 times 27}\) = ₹ 2500
∴ SI = \(frac{P times R times T}{100} = frac{2500 times 9 times 3}{100}\) = ₹ 675