Which of the following is used as retardant in nuclear reactor?
(A) Thorium
(B) Graphite
(C) Radium
(D) Ordinary water
The fibre of the electric bulb is formed.
(A) From copper
(B) Aluminium
(C) From lead
(D) From Tungston
Indane gas is a mixture
(A) Butane and Hydrogen
(B) butane and oxygen
(C) Butane and Propane's
(D) Methane and oxygen
A flat mirror has a minimum height to see a full reflection of a person.
(A) Equal to the height of the person
(B) Half of the height of a person
(C) One-fourth of the person's height
(D) Double the height of the person
Night blindness is cause by lack of which vitamin?
(A) Vitamin A
(B) Vitamin B
(C) Vitamin C
(D) Vitamin D
The metal that is usually extracted from sea water is
(A) Ca
(B) Na
(C) K
(D) Mg
The metal used to recover copper from a solution of copper sulphate is
(A) Na
(B) Ag
(C) Hg
(D) Fe
Safety fuse wire used in domestic electrical appliances is made of metal of low
(A) resistance
(B) melting point
(C) specific gravity
(D) conductance
The instrument which uses sound waves to measure the depth of oceans is
(A) Radar
(B) Sonar
(C) Altimeter
(D) Venturimeter
The best conductor of heat among the following is
(A) alcohol
(B) mercury
(C) ether
(D) water
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