Physics

Free set

Showing 1301 to 1325 of 1648 questions (page 53 of 66).

1301. A couple consists of

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

1302. The area under a velocity time graph represents

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

1303. A ball is thrown vertically upwards with 19.6 m s-1. The maximum height reached is

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

1304. A stone is dropped from rest and falls 45 m. The time taken is about

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

1305. The slope of a momentum time graph gives

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

1306. When a bomb at rest explodes into two unequal fragments, the two fragments have

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

1307. The coefficient of restitution for a perfectly elastic collision is

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

1308. 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. 2mv C. 4mv D. mv/2 E. mv

1309. A body moves with uniform velocity. The net force acting on it is

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

1310. One joule is equal to

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

1311. The work done in lifting a 5 kg mass through a vertical height of 2 m is about

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

1312. The kinetic energy of a 2 kg body moving at 3 m s-1 is

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

1313. A crane lifts a 100 kg load at a steady 2 m s-1. The power developed is about

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

1314. If the momentum of a body is doubled, its kinetic energy becomes

A. half B. four times C. double D. eight times E. unchanged

1315. Which of the following is a non-conservative force?

A. friction B. magnetic force on a static charge C. elastic spring force D. gravitational force E. electrostatic force

1316. A machine takes in 500 J and delivers 400 J of useful output. Its efficiency is

A. 20% B. 40% C. 80% D. 60% E. 125%

1317. The angular displacement in one complete revolution is

A. 1 radian B. pi radians C. pi/2 radians D. 2 pi radians E. 4 pi radians

1318. A wheel rotating at 300 revolutions per minute has an angular speed of about

A. 18.8 rad s-1 B. 5 rad s-1 C. 62.8 rad s-1 D. 300 rad s-1 E. 31.4 rad s-1

1319. The centripetal force on a 2 kg body moving at 4 m s-1 in a circle of radius 2 m is

A. 4 N B. 2 N C. 32 N D. 16 N E. 8 N

1320. The rotational kinetic energy of a rigid body is

A. I omega2 B. (1/2)I omega2 C. (1/2)I omega D. (1/2)m v omega E. I omega

1321. The rotational analogue of Newton's second law is

A. p = mv B. F = ma C. tau = I alpha D. L = I omega E. tau = r x F

1322. An astronaut in an orbiting spacecraft feels weightless because

A. gravity is absent at that altitude B. the mass of the astronaut becomes zero C. air resistance balances gravity D. the spacecraft is not accelerating E. the spacecraft and astronaut have the same centripetal acceleration

1323. Artificial gravity in a rotating space station is produced by

A. the centripetal acceleration of rotation B. magnetic fields C. electrostatic attraction D. increasing the mass of the station E. reducing the orbital radius

1324. According to Stokes' law, the drag force on a sphere of radius r moving with speed v through a fluid of viscosity eta is

A. 6 pi eta v / r B. 6 pi eta r2 v C. (1/6) pi eta r v D. 6 pi eta r v E. 4 pi eta r v

1325. The gauge pressure at a depth of 10 m in water is about

A. 9.8 x 10^4 Pa B. 9.8 x 10^2 Pa C. 9.8 x 10^5 Pa D. 1.0 x 10^2 Pa E. 9.8 x 10^3 Pa

Previous 1 2 … 51 52 53 54 55 … 65 66 Next

Get full access to the MCQ bank

Premium questions, timed mock tests, and detailed explanations.

See premium plans