Back to MCQ Bank

Mixed Practice

Free set

Showing 1626 to 1650 of 3046 questions (page 66 of 122).

1626. The work done in lifting a 5 kg mass through a vertical height of 2 m is about

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

1627. The kinetic energy of a 2 kg body moving at 3 m s-1 is

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

1628. 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

1629. If the momentum of a body is doubled, its kinetic energy becomes

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

1630. Which of the following is a non-conservative force?

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

1631. A machine takes in 500 J and delivers 400 J of useful output. Its efficiency is

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

1632. The angular displacement in one complete revolution is

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

1633. A wheel rotating at 300 revolutions per minute has an angular speed of about

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

1634. The centripetal force on a 2 kg body moving at 4 m s-1 in a circle of radius 2 m is

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

1635. The rotational kinetic energy of a rigid body is

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

1636. The rotational analogue of Newton's second law is

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

1637. An astronaut in an orbiting spacecraft feels weightless because

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

1638. Artificial gravity in a rotating space station is produced by

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

1639. 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. 4 pi eta r v B. (1/6) pi eta r v C. 6 pi eta v / r D. 6 pi eta r v E. 6 pi eta r2 v

1640. The gauge pressure at a depth of 10 m in water is about

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

1641. The lift on an aeroplane wing arises because the air above the wing moves

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

1642. The SI unit of surface tension is

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

1643. A liquid rises in a capillary tube because of

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

1644. The potential energy of a body in SHM at displacement x is

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

1645. Resonance occurs when the frequency of the driving force

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

1646. The effect of damping on an oscillating system is to

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

1647. 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. decrease D. remain the same E. become zero

1648. The displacement of a body in SHM starting from the mean position is described by

A. x = x0 cos(omega t) B. x = x0 omega t C. x = omega t D. x = x0 tan(omega t) E. x = x0 sin(omega t)

1649. A sound wave of frequency 170 Hz travels at 340 m s-1. Its wavelength is

A. 2 m B. 4 m C. 1 m D. 0.2 m E. 0.5 m

1650. Sound waves in air are

A. transverse B. polarized C. longitudinal D. electromagnetic E. stationary only

Previous 1 2 … 64 65 66 67 68 … 121 122 Next

Get full access to the MCQ bank

Premium questions, timed mock tests, and detailed explanations.

See premium plans