Physics

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Showing 276 to 300 of 1648 questions (page 12 of 66).

276. Energy production in the Sun is mainly due to

A. nuclear fission B. nuclear fusion C. chemical combustion D. radioactive decay of uranium E. gravitational contraction alone

277. Which radiation has the greatest penetrating power?

A. alpha B. beta C. gamma D. proton E. neutron in air only

278. In a nuclear reactor, the moderator is used to

A. absorb excess neutrons B. slow down fast neutrons C. shield the operators D. increase the fuel temperature E. control the coolant flow

279. Which quantity has the same dimensions as work?

A. power B. torque C. impulse D. pressure E. force

280. The number of significant figures in 1.230 x 10^4 is

A. 2 B. 3 C. 4 D. 5 E. 6

281. The sum of 2.50 cm and 1.6 cm, expressed to the correct number of decimal places, is

A. 4.10 cm B. 4.1 cm C. 4 cm D. 4.100 cm E. 4.16 cm

282. One radian is approximately equal to

A. 1 degree B. 57.3 degrees C. 3.14 degrees D. 180 degrees E. 6.28 degrees

283. Two vectors of magnitudes 3 and 4 units give a resultant of 7 units. The angle between them is

A. 0 degrees B. 45 degrees C. 90 degrees D. 120 degrees E. 180 degrees

284. The cross product of a vector with itself is

A. its magnitude squared B. a unit vector C. the null vector D. twice the vector E. undefined

285. The magnitude of the cross product of two vectors of magnitudes 2 and 3 units with 30 degrees between them is

A. 1.5 B. 3 C. 5.2 D. 6

286. A force of 5 N acts perpendicular to a spanner at a distance of 0.2 m from the pivot. The torque produced is

A. 0.04 N m B. 1 N m C. 5 N m D. 25 N m E. 10 N m

287. The projection of vector A along vector B is given by

A. A x B B. A.B / |B| C. A.B / |A| D. |A| |B| E. A.B

288. A couple consists of

A. two equal forces in the same direction B. two equal and opposite parallel forces not acting along the same line C. a single force through the centre of mass D. three concurrent forces E. two unequal opposite forces

289. The area under a velocity time graph represents

A. acceleration B. displacement C. force D. momentum E. power

290. A ball is thrown vertically upwards with 19.6 m s-1. The maximum height reached is

A. 9.8 m B. 19.6 m C. 39.2 m D. 4.9 m E. 29.4 m

291. A stone is dropped from rest and falls 45 m. The time taken is about

A. 1.5 s B. 2.1 s C. 3.0 s D. 4.5 s E. 9.0 s

292. The slope of a momentum time graph gives

A. impulse B. force C. velocity D. kinetic energy E. power

293. When a bomb at rest explodes into two unequal fragments, the two fragments have

A. equal kinetic energies B. equal speeds C. equal and opposite momenta D. equal masses E. zero total kinetic energy

294. The coefficient of restitution for a perfectly elastic collision is

B. 0.5 C. 1 D. between 0 and 1 but never 1 E. greater than 1

295. A ball of mass m strikes a wall normally with speed v and rebounds with the same speed. The magnitude of the change in its momentum is

A. zero B. mv C. 2mv D. mv/2 E. 4mv

296. A body moves with uniform velocity. The net force acting on it is

A. equal to its weight B. equal to its momentum C. zero D. proportional to its speed E. maximum

297. One joule is equal to

A. 10^5 erg B. 10^7 erg C. 10^-7 erg D. 10^3 erg E. 10^9 erg

298. The work done in lifting a 5 kg mass through a vertical height of 2 m is about

A. 10 J B. 49 J C. 98 J D. 196 J E. 2.5 J

299. The kinetic energy of a 2 kg body moving at 3 m s-1 is

A. 3 J B. 6 J C. 9 J D. 18 J E. 12 J

300. A crane lifts a 100 kg load at a steady 2 m s-1. The power developed is about

A. 200 W B. 980 W C. 1960 W D. 3920 W E. 490 W

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