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Showing 2401 to 2425 of 3046 questions (page 97 of 122).

2401. 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

2402. 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

2403. 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

2404. 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

2405. 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

2406. 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

2407. If the momentum of a body is doubled, its kinetic energy becomes

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

2408. 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

2409. 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%

2410. 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

2411. 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

2412. 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

2413. 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

2414. 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

2415. 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

2416. 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

2417. 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

2418. 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

2419. The lift on an aeroplane wing arises because the air above the wing moves

A. slower, giving higher pressure above B. at the same speed as below C. faster, giving lower pressure above D. only in turbulent flow E. in the opposite direction

2420. The SI unit of surface tension is

A. N m-2 B. N m-1 C. J m D. N m E. N m2

2421. A liquid rises in a capillary tube because of

A. surface tension and adhesion B. atmospheric temperature C. viscosity D. its density alone E. turbulence

2422. The potential energy of a body in SHM at displacement x is

A. (1/2)kx B. (1/2)k/x C. kx D. kx2 E. (1/2)kx2

2423. Resonance occurs when the frequency of the driving force

A. is doubled B. is zero C. is much higher than the natural frequency D. equals the natural frequency of the system E. is much lower than the natural frequency

2424. The effect of damping on an oscillating system is to

A. increase the amplitude B. reduce the amplitude progressively C. increase the natural frequency indefinitely D. keep the amplitude constant E. reverse the phase

2425. The time period of a simple pendulum taken to the Moon, where g is about one sixth of its value on Earth, will

A. become infinite B. increase C. become zero D. decrease E. remain the same

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