Back to MCQ Bank

Physics

Free set

Showing 551 to 575 of 1648 questions (page 23 of 66).

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

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

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

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

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

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

554. The angular displacement in one complete revolution is

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

555. 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

556. 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. 4 N C. 2 N D. 16 N E. 8 N

557. The rotational kinetic energy of a rigid body is

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

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

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

559. An astronaut in an orbiting spacecraft feels weightless because

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

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

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

561. 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. 4 pi eta r v D. 6 pi eta r v E. (1/6) pi eta r v

562. 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 10^3 Pa D. 9.8 x 10^5 Pa E. 1.0 x 10^2 Pa

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

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

564. The SI unit of surface tension is

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

565. A liquid rises in a capillary tube because of

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

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

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

567. Resonance occurs when the frequency of the driving force

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

568. 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. reverse the phase E. keep the amplitude constant

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

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

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

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

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

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

572. Sound waves in air are

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

573. A closed organ pipe produces

A. no harmonics B. all harmonics C. only even harmonics D. only odd harmonics E. only the fundamental

574. The fundamental frequency of a closed organ pipe of length L is

A. v/2L B. v/L C. 2v/L D. 4v/L E. v/4L

575. When a source of sound approaches a stationary observer, the observed frequency

A. becomes zero B. remains the same C. first decreases then increases D. increases E. decreases

Previous 1 2 … 21 22 23 24 25 … 65 66 Next

Get full access to the MCQ bank

Premium questions, timed mock tests, and detailed explanations.

See premium plans