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Showing 2776 to 2800 of 3046 questions (page 112 of 122).

2776. Dimensional analysis can be used to

A. measure random errors B. determine the direction of a vector C. check the homogeneity of an equation D. find the numerical constant in a formula E. count significant figures

2777. A speed of 72 km per hour is equal to

A. 20 m s-1 B. 7.2 m s-1 C. 25 m s-1 D. 36 m s-1 E. 10 m s-1

2778. The unit vectors i, j and k are directed along

A. the direction of motion only B. the resultant of three vectors C. the x, y and z axes respectively D. any three arbitrary directions E. the field lines

2779. The component of the weight of a body along an incline of angle theta is

A. mg/sin theta B. mg tan theta C. mg cos theta D. mg E. mg sin theta

2780. A body resting in a position such that any small displacement raises its centre of gravity is in

A. dynamic equilibrium B. unstable equilibrium C. neutral equilibrium D. stable equilibrium E. no equilibrium

2781. The point at which the entire weight of a body may be considered to act is the

A. centroid of the surface B. centre of gravity C. point of suspension D. metacentre E. centre of mass only in space

2782. A torque that tends to produce anticlockwise rotation is conventionally taken as

A. undefined B. negative C. positive D. equal to the force E. zero

2783. The impulse delivered to a body equals the area under a graph of

A. acceleration against time B. force against time C. force against displacement D. velocity against time E. momentum against time

2784. Airbags and seat belts reduce injury in a collision by

A. increasing the time over which the momentum changes B. increasing the force on the passenger C. reducing the change in momentum D. reversing the momentum E. reducing the mass of the passenger

2785. Two cars travel in the same direction at 30 m s-1 and 20 m s-1. The velocity of the first relative to the second is

A. 25 m s-1 B. zero C. 50 m s-1 D. 600 m s-1 E. 10 m s-1

2786. The thrust developed by a rocket depends on the rate of ejection of gases and their

A. temperature only B. pressure at the nozzle only C. colour D. exhaust speed relative to the rocket E. density at sea level

2787. A block slides down a frictionless incline of angle 30 degrees. Its acceleration is about

A. zero B. 2.45 m s-2 C. 8.5 m s-2 D. 9.8 m s-2 E. 4.9 m s-2

2788. For a projectile, the vertical component of velocity at the instant of landing on level ground is

A. equal in magnitude to the initial vertical component B. twice the initial vertical component C. equal to the horizontal component D. zero E. maximum at the top

2789. The work done by gravity on a body carried around a closed path and returned to its starting point is

A. equal to the kinetic energy B. equal to mgh C. positive D. zero E. negative

2790. Which of the following is a non-conventional energy source?

A. petroleum B. tidal energy C. coal D. furnace oil E. natural gas

2791. Geothermal energy is obtained from

A. wind B. heat within the Earth's crust C. burning biomass D. sunlight directly E. the tides

2792. A body slides down a smooth curved track from height h. Its speed at the bottom is

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

2793. The total kinetic energy of a body rolling without slipping is the sum of

A. rotational and translational kinetic energies B. angular momentum and torque C. translational kinetic energy and potential energy D. two rotational kinetic energies E. kinetic energy and work done

2794. For a satellite in a stable circular orbit, the required centripetal force is provided by

A. the normal reaction B. atmospheric pressure C. magnetic forces D. gravitational attraction of the Earth E. the thrust of its engines

2795. The instrument used to measure blood pressure is the

A. sphygmomanometer B. venturimeter C. hydrometer D. manometer E. barometer

2796. Normal systolic and diastolic blood pressures for a healthy adult are about

A. 12 and 8 mm of mercury B. 200 and 100 mm of mercury C. 760 and 120 mm of mercury D. 80 and 120 mm of mercury respectively E. 120 and 80 mm of mercury respectively

2797. The work required to increase the surface area of a liquid is stored as

A. heat only B. pressure energy C. surface energy D. kinetic energy E. elastic energy of the container

2798. A streamline in steady fluid flow is a line such that

A. the density varies along it B. the fluid speed is constant along it C. the tangent at every point gives the direction of the fluid velocity there D. the pressure is constant along it E. two streamlines may cross

2799. Simple harmonic motion may be regarded as the projection on a diameter of

A. uniform circular motion B. a damped decay C. a parabolic path D. random motion E. a straight line motion

2800. The maximum acceleration of a body in SHM of amplitude x0 and angular frequency omega is

A. omega x0 B. omega squared x0 C. omega squared divided by x0 D. x0 divided by omega E. omega x0 squared

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