Physics

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Showing 651 to 675 of 1648 questions (page 27 of 66).

651. A body is projected at 10 m s-1 at 60 degrees to the horizontal. Its horizontal component of velocity is

A. 10 m s-1 B. 6.5 m s-1 C. 5 m s-1 D. 2.5 m s-1 E. 8.66 m s-1

652. When two bodies of equal mass collide elastically in one dimension, they

A. move with the same velocity B. both come to rest C. stick together D. exchange their velocities E. reverse direction with doubled speed

653. In a perfectly inelastic collision, the quantity that is not conserved is

A. charge B. total energy C. mass D. linear momentum E. kinetic energy

654. A projectile launched at 45 degrees with a speed of 10 m s-1 has a horizontal range of about

A. 5.1 m B. 10.2 m C. 15.3 m D. 1.02 m E. 20.4 m

655. The weight of a body at the equator compared with its weight at the poles is

A. slightly less B. doubled C. the same D. zero E. greater

656. The work done by a variable force is obtained from a force displacement graph as

A. the maximum ordinate B. the slope of the graph C. the length of the curve D. the intercept on the force axis E. the area under the graph

657. The orbital speed required for a satellite in a low Earth orbit is about

A. 3 km s-1 B. 1.6 km s-1 C. 7.9 km s-1 D. 11.2 km s-1 E. 29.8 km s-1

658. The escape velocity from a planet is independent of

A. the mass of the escaping body B. the mass of the planet C. the gravitational constant D. the value of g at the surface E. the radius of the planet

659. One watt is equal to

A. one joule second B. one joule per second C. one joule D. one newton metre E. one newton per second

660. The elastic potential energy stored in a spring of spring constant k compressed by x is

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

661. The SI unit of angular acceleration is

A. rad s-2 B. rev s-1 C. rad s-1 D. N m E. m s-2

662. An ice skater spinning with arms outstretched pulls the arms inwards. The angular velocity

A. becomes zero B. decreases C. reverses D. increases E. stays the same

663. The moment of inertia of a thin circular hoop of mass M and radius R about its central axis is

A. MR2/4 B. 2MR2/3 C. MR2/2 D. 2MR2/5 E. MR2

664. The orbital speed of a satellite at distance r from the centre of the Earth is

A. sqrt(GMr) B. GM/r C. sqrt(GM/r) D. GM/r2 E. sqrt(2GM/r)

665. A body moving in a circle with increasing speed has

A. tangential acceleration only B. zero acceleration C. both centripetal and tangential acceleration D. constant velocity E. centripetal acceleration only

666. A hydraulic press works on the principle stated by

A. Pascal B. Torricelli C. Bernoulli D. Archimedes E. Stokes

667. The upthrust on a body immersed in a fluid equals the weight of

A. the body in air B. the fluid above the body C. the body D. the container E. the fluid displaced

668. The viscosity of a liquid, as the temperature rises,

A. stays constant B. decreases C. first rises then falls D. increases E. becomes infinite

669. In a horizontal pipe of varying cross section, the pressure is lowest where the

A. pipe is highest B. fluid is at rest C. cross section is largest D. cross section is smallest E. density is greatest

670. A body falling through a viscous fluid attains terminal velocity when

A. the weight equals the sum of upthrust and drag B. the fluid becomes turbulent C. the acceleration is maximum D. the drag force becomes zero E. the upthrust exceeds the weight

671. The angular frequency of an oscillation of frequency f is

A. f2 B. 2 pi f C. 1/f D. f/2 pi E. pi f

672. A simple pendulum of length 1 m has a time period of about

A. 1.0 s B. 3.1 s C. 6.3 s D. 1.4 s E. 2.0 s

673. Oscillations of a system driven by an external periodic force are called

A. stationary oscillations B. transverse oscillations C. forced oscillations D. free oscillations E. damped oscillations only

674. At a node in a stationary wave, the displacement is

A. increasing steadily B. zero at all times C. half the amplitude D. maximum E. equal to the wavelength

675. Sound travels fastest in

A. water B. air C. vacuum D. hydrogen E. steel

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