What product is formed when sodium bicarbonate is heated excessively?
(A) sodium carbonate
(B) sodium hydroxide
(C) sodium peroxide
(D) sodium monoxide
Stars shine, but they do not shine because-
(A) They emit light of constant intensity
(B) Their distance from the earth does not change with time
(C) They are far away from the earth and as a result the intensity of light decreases
(D) They are closer to the earth, so they get more light and are not visible even if there are small changes in intensity
Which one of the following options is not correct regarding X-ray?
(A) It has low penetrating power
(B) It moves at the speed of light
(C) it can be both reflected or refracted
(D) can affect the plate of photography
Which of the following weeds can control water pollution caused by industrial effluents?
(A) Parthenium
(B) Elephant grass
(C) Water Aquarius
(D) Mogar grass
What are the means of Waste (sledge) water?
(A) Waste water from kitchen is
(B) Waste water coming out of toilet is
(C) Waste water from factories is
(D) Waste water from hospitals is
Which of the following is the purest form of carbon?
(A) Anthracite
(B) Kajal
(C) Gaphite
(D) Charcoal
Which of the following gives hardness to stainless steel?
(A) Zinc
(B) Lead
(C) Carbon
(D) Tin
Which of the following carries food and other elements in plants?
(A) Xylem
(B) Phloem
(C) Chloroplast
(D) None of these
On what principle does the washing machine work?
(A) Dialysis
(B) Diffusion
(C) Reverse Osmosis
(D) Centrifugation
What is Cellulose?
(A) Monosaccharide
(B) Di-saccharide
(C) Polysaccharide
(D) none of these
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