271. The temperature of liquid nitrogen is:
A. -32 Degree Celsius
B. -80 Degree Celsius
C. -100 Degree Celsius
D. -196 Degree Celsius
272. Which one of the following is an alkali?
A. Water
B. Vinegar
C. Lemon juice
D. Slaked lime
273. If an alkali is slowly mixed with an acidic solution, the PH of the acidic solution will:
A. Increase
B. Decrease
C. Increase to 7 and then decrease
D. Decrease to 7 and then increase
274. The usual raw material for ceramics generally found beneath the topsoil is?
A. Sand
B. Silt
C. Clay
D. Plaster of Paris
275. Polyamides are synthetic polymers commonly known as:
A. Synthetic rubber
B. Nylon
C. Cellulose
D. Protein
276. Telephone was invented in 1876 in America by:
A. Marconi
B. Galileo
C. John Beard
D. Graham Bell
277. One gram per Centimeter-Cube is the density of?
(A) Milk
B) Water
(C) Ice
(D) None of the above
278. According to the Kinetic theory of gases, the molecular collisions are elastic. Such collisions cause
A) No energy change
B) A small energy change
C) High energy change
D) None of these
279. If the velocity of an object is doubled then its K.E becomes:
A) double
B) constant
C) four times
D) sixteen times
280. __ is a non-conservative force.
A) Electric force
B) Magnetic force
C) Gravitational force
D) Frictional force
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