Which of the following is used as a coolant in nuclear reactors?
(A) calcium
(B) Graphite
(C) Heavy water
(D) Cadmium
Which is the largest human cell?
(A) Spleen
(B) Ovum
(C) Liver
(D) Skin
Endothermic reactions are those in which?
(A) Temperature increases
(B) Light is produced
(C) Heat is evolved
(D) Heat is absorbed
Burns caused by steam are much more severe than those caused by boiling water because-
(A) Steam pierces through the pores of body quickly
(B) Steam has latent heat
(C) Temperature of steam is higher
(D) Steam is gas and engulfs the body quickly
Which of the following is an epidemic and endemic disease?
(A) polio
(B) measles
(C) Typhoid
(D) Cholera
Which of the following is an example of diffusion of gases?
(A) Perfume Smell
(B) Food aroma
(C) Fragrance of incense sticks
(D) All of the above
The first protocol to ban the emissions of chlorofluorocarbons in the atmosphere was made in
(A) Montreal
(B) Osaka
(C) Geneva
(D) Florida
Which of the following creatures is oviparous?
(A) Frog
(B) Rabbit
(C) Mouse
(D) Squirrel
A positively charged body has in it-
(A) deficiency of electrons
(B) deficiency of protons
(C) excess of neutrons
(D) excess of electrons
Which of the following energy varies with the height of an object?
(A) Nuclear energy
(B) Kinetic energy
(C) Chemical energy
(D) Potential energy
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