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Showing 751 to 775 of 1648 questions (page 31 of 66).

751. The maximum horizontal range of a projectile is obtained at a launch angle of

A. 45 degrees B. 75 degrees C. 30 degrees D. 60 degrees E. 90 degrees

752. At the highest point of its trajectory, the velocity of a projectile is

A. horizontal B. vertical and downward C. zero D. vertical and upward E. equal to the launch velocity

753. A body falling freely from rest covers distances in successive equal intervals of time in the ratio

A. 1:2:3 B. 1:3:5 C. 2:3:4 D. 1:1:1 E. 1:4:9

754. Rocket propulsion is explained on the basis of

A. conservation of energy B. Newton's first law C. conservation of angular momentum D. law of gravitation E. conservation of linear momentum

755. The time of flight of a projectile launched with speed v at angle theta over level ground is

A. 2v cos theta / g B. v cos theta / g C. 2v sin theta / g D. v sin theta / g E. v2 sin 2theta / g

756. A 2 kg body moving at 5 m s-1 is brought to rest in 0.5 s. The average retarding force is

A. 2.5 N B. 10 N C. 50 N D. 20 N E. 5 N

757. The work done by the centripetal force on a body moving in a circle at constant speed is

A. equal to the potential energy B. equal to the kinetic energy C. maximum D. zero E. negative and constant

758. The escape velocity from the surface of the Earth is approximately

A. 11.2 km s-1 B. 1.6 km s-1 C. 9.8 m s-1 D. 3 x 10^8 m s-1 E. 7.9 km s-1

759. One kilowatt hour is equal to

A. 1 x 10^3 J B. 3.6 x 10^7 J C. 3.6 x 10^5 J D. 3.6 x 10^3 J E. 3.6 x 10^6 J

760. Power delivered by a constant force F to a body moving with velocity v is

A. F v2 B. F/v C. F . v D. F/v2 E. F x v (vector product)

761. A body of mass m is dropped from height h. At height h/2 the ratio of its kinetic energy to potential energy (measured from the ground) is

A. 1:4 B. 1:1 C. 2:1 D. 4:1 E. 1:2

762. The work energy principle states that the net work done on a body equals

A. the change in its kinetic energy B. its total energy C. its momentum D. the change in its potential energy E. the power delivered

763. The SI unit of angular momentum is equivalent to

A. W s B. J s-1 C. N m D. J s E. N s

764. Centripetal acceleration of a body moving in a circle of radius r with speed v is

A. v2r B. r/v2 C. v2/r D. v/r E. vr

765. For a vehicle taking a banked curve without friction, the banking angle satisfies

A. sin theta = v2/rg B. tan theta = v2/rg C. tan theta = rg/v2 D. cos theta = v2/rg E. tan theta = v/rg

766. The moment of inertia of a uniform disc of mass M and radius R about an axis through its centre and perpendicular to its plane is

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

767. The orbital period of a geostationary satellite is

A. 1 hour B. 365 days C. 12 hours D. 24 hours E. 28 days

768. A person in a lift accelerating upwards with acceleration a experiences an apparent weight of

A. zero B. m(g + a) C. ma D. mg E. m(g - a)

769. Angular velocity and linear velocity for a particle in circular motion are related by

A. omega = v2/r B. v = omega r2 C. v = omega/r D. omega = v r E. v = r omega

770. The terminal velocity of a small sphere falling through a viscous fluid is proportional to

A. 1/r B. r C. r2 D. 1/r2 E. r3

771. Bernoulli's equation is a statement of the conservation of

A. energy B. charge C. angular momentum D. momentum E. mass

772. A Venturi meter is used to measure

A. atmospheric pressure B. density of a liquid C. viscosity of a liquid D. surface tension E. speed of fluid flow

773. The SI unit of coefficient of viscosity is

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

774. According to Torricelli's theorem, the speed of efflux of a liquid from a small hole at depth h below the free surface is

A. sqrt(gh) B. sqrt(2gh) C. 2gh D. sqrt(gh/2) E. gh

775. The equation of continuity for an incompressible fluid states that

A. A v is constant B. P + rho g h is constant C. P v is constant D. A/v is constant E. rho v is constant

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