The term ‘ecosystem’ was proposed by—
(A) Odum
(B) Tansley
(C) Whitker
(D) Goli
When chlorophyll is burnt which element is obtained?
(A) Ca
(B) Na
(C) Mg
(D) Mn
Which one of the following is highly dangerous radioactive pollutant ?
(A) Phosphorus-32
(B) Sulphur-35
(C) Strontium-90
(D) Calcium-40
Which of the following is not a chemical fertilizer?
(A) Urea
(B) Sodium Sulphate
(C) Super Phosphate
(D) Potassium Nitrate
Which lubricant is used for heavy machines?
(A) Bauxite
(B) Phosphorus
(C) Graphite
(D) Silicon oil
Acid rain is mainly a mixture of—
(A) Sulphuric acid and nitric acid
(B) Hexane and methane
(C) Acetic acid and bromine
(D) Ascorbic acid and citric acid
The primary colours in photography are –
(A) Red, blue, yellow
(B) Red, yellow, green
(C) Red, blue, green
(D) Red, green, cyan
In electric supply lines in India, which parameter is kept constant?
(A) Voltage
(B) Current
(C) Frequency
(D) Power
The most abundant element in the human body is
(A) carbon
(B) iron
(C) nitrogen
(D) oxygen
Which one of the Endocrine glands are known as master gland?
(A) Pituitary
(B) Adrenal
(C) Thyroid
(D) Parathyroid
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