273. The moon is a/an
(a) Planet
(b) Satellite
(c) Asteroid
(d) Star
274. Which of the following elements is used for electric lamp filaments?
(a) Gold
(b) Tungsten
(c) Copper
(d) Nickel
275. Incubation period is
(a) The period between the infection and the appearance of signs of a disease
(b) The menstruation period
(c) The recovery period of a disease
(d) None of these
276. The number of teeth in an adult person is
(a) 32
(b) 34
(c) 30
(d) 28
277. The number of bones in the human body is
(a) 206
(b) 212
(c) 204
(d) 180
278. Echo is produced by the of sound waves.
(a) Refraction
(b) Reflection
(c) Absorption
(d) Diffraction
279. Coating of iron with zinc is known as
(a) Galvanisation
(b) Electroplating
(c) Ionization
(d) Vulcanization
280. Which of the following helps in the clotting of blood ?
(a) Vitamin B1
(b) Vitamin B2
(c)Vitamin K
(d) Vitamin D
281. RNA synthesizes
(a) Proteins
(b) Vitamins
(c) Minerals
(d) None of these
282. Hormones are chemical substances which are produced in one part of the body and whose functions are elsewhere
in the body. Which of the following is a hormone ?
(a) Plasma
(b) Insulin
(c) Casein
(d) Haemoglobin
283. The earth’s orbit around the sun is
(a) Elliptical
(b) Circular
(c) Hyperbolic
(d) None of the above
284. Which of the following is not a base metal ?
(a) Copper
(b) Iron
(c) Tin
(d) Aluminium
285. Which of the following metals is known as the ‘metal of hope’ ?
(a) Mercury
(b) Plutonium
(c) Uranium
(d) Radium