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Showing 251 to 275 of 3046 questions (page 11 of 122).

251. The stationary phase in thin layer chromatography is usually

A. silica gel or alumina B. the mobile solvent C. air D. water only E. the sample itself

252. How many base units are defined in the International System of Units (SI)?

A. 5 B. 6 C. 7 D. 8 E. 9

253. The dimensions of Planck's constant are the same as those of

A. energy B. power C. linear momentum D. angular momentum E. force

254. A screw gauge has a pitch of 0.5 mm and 50 divisions on its circular scale. Its least count is

A. 0.5 mm B. 0.05 mm C. 0.01 mm D. 0.001 mm E. 0.025 mm

255. Which of the following is a supplementary unit in SI?

A. newton B. radian C. kelvin D. mole E. joule

256. The dimensional formula of pressure is

A. [ML-1T-2] B. [MLT-2] C. [ML2T-2] D. [ML-3T0] E. [ML-2T-2]

257. If a quantity is measured as 4.0 cm with an absolute uncertainty of 0.1 cm, the percentage uncertainty is

A. 0.25% B. 2.5% C. 4% D. 25% E. 0.4%

258. A dimensionally correct equation

A. is always physically correct B. must be numerically correct C. may still be physically incorrect D. cannot contain constants E. always contains a trigonometric term

259. A unit vector perpendicular to the plane containing vectors A and B is given by

A. A.B B. (A x B)/|A x B| C. A + B D. (A.B)/|A||B| E. A - B

260. The value of i . (j x k) is

B. 1 C. -1 D. i E. j

261. Two forces of 10 N each act on a body with an angle of 120 degrees between them. The magnitude of the resultant is

A. 0 N B. 10 N C. 17.3 N D. 20 N E. 14.1 N

262. If A + B = A - B, then vector B must be

A. a unit vector B. parallel to A C. perpendicular to A D. a null vector E. equal to A

263. Torque is defined as

A. F . r B. r x F C. r . F D. F x r E. r + F

264. For a body in complete equilibrium, the number of independent conditions that must be satisfied is

A. 1 B. 2 C. 3 D. 4 E. 5

265. The scalar product of two mutually perpendicular vectors is

A. maximum B. equal to their cross product C. zero D. negative E. unity

266. A vector of magnitude 10 units makes an angle of 30 degrees with the x-axis. Its y-component is

A. 5 units B. 8.66 units C. 10 units D. 2.5 units E. 7.07 units

267. Newton's second law of motion provides the definition of

A. inertia B. force C. momentum D. action and reaction E. mass

268. The SI unit of impulse is equivalent to

A. N m B. kg m s-1 C. kg m s-2 D. J s E. N s-1

269. In a perfectly elastic collision, which quantities are conserved?

A. momentum only B. kinetic energy only C. momentum and kinetic energy D. momentum and mass only E. kinetic energy and mass only

270. The maximum horizontal range of a projectile is obtained at a launch angle of

A. 30 degrees B. 45 degrees C. 60 degrees D. 75 degrees E. 90 degrees

271. At the highest point of its trajectory, the velocity of a projectile is

A. zero B. vertical and upward C. vertical and downward D. horizontal E. equal to the launch velocity

272. A body falling freely from rest covers distances in successive equal intervals of time in the ratio

A. 1:2:3 B. 1:3:5 C. 1:4:9 D. 1:1:1 E. 2:3:4

273. Rocket propulsion is explained on the basis of

A. conservation of energy B. conservation of linear momentum C. Newton's first law D. law of gravitation E. conservation of angular momentum

274. The time of flight of a projectile launched with speed v at angle theta over level ground is

A. v sin theta / g B. 2v sin theta / g C. v cos theta / g D. 2v cos theta / g E. v2 sin 2theta / g

275. A 2 kg body moving at 5 m s-1 is brought to rest in 0.5 s. The average retarding force is

A. 5 N B. 10 N C. 20 N D. 2.5 N E. 50 N

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