EdgineerX

1076. An error that occurs in the same direction in every reading and does not average out is called

A. a personal error only B. a rounding error C. a random error D. an absolute error E. a systematic error

1077. In multiplication and division, the result is rounded to the

A. smallest number of significant figures among the data B. largest number of significant figures among the data C. number of decimal places in the least precise value D. same number of digits as the first value E. nearest whole number

1078. Dimensional analysis can be used to

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

1079. A speed of 72 km per hour is equal to

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

1080. The unit vectors i, j and k are directed along

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

1081. The component of the weight of a body along an incline of angle theta is

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

1082. A body resting in a position such that any small displacement raises its centre of gravity is in

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

1083. The point at which the entire weight of a body may be considered to act is the

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

1084. A torque that tends to produce anticlockwise rotation is conventionally taken as

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

1085. The impulse delivered to a body equals the area under a graph of

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

1086. 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 mass of the passenger D. reversing the momentum E. reducing the change in momentum

1087. 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. zero B. 50 m s-1 C. 600 m s-1 D. 25 m s-1 E. 10 m s-1

1088. The thrust developed by a rocket depends on the rate of ejection of gases and their

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

1089. A block slides down a frictionless incline of angle 30 degrees. Its acceleration is about

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

1090. 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. equal to the horizontal component C. twice the initial vertical component D. maximum at the top E. zero

1091. The work done by gravity on a body carried around a closed path and returned to its starting point is

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

1092. Which of the following is a non-conventional energy source?

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

1093. Geothermal energy is obtained from

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

1094. A body slides down a smooth curved track from height h. Its speed at the bottom is

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

1095. 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. kinetic energy and work done D. translational kinetic energy and potential energy E. two rotational kinetic energies

1096. For a satellite in a stable circular orbit, the required centripetal force is provided by

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

1097. The instrument used to measure blood pressure is the

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

1098. Normal systolic and diastolic blood pressures for a healthy adult are about

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

1099. The work required to increase the surface area of a liquid is stored as

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

1100. A streamline in steady fluid flow is a line such that

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

Physics