EdgineerX

1576. An angle of 90 degrees expressed in radians is

A. pi B. pi/4 C. pi/3 D. 2 pi E. pi/2

1577. Vectors are added graphically by the

A. perpendicular axis rule B. head to tail rule C. right hand rule D. parallel axis rule E. inverse square rule

1578. Subtracting vector B from vector A is equivalent to adding

A. B to A B. zero to A C. the magnitude of B to A D. twice B to A E. the negative of B to A

1579. The direction of the resultant of two perpendicular components Ax and Ay is given by

A. tan theta equals Ax divided by Ay B. tan theta equals Ay divided by Ax C. theta equals Ax plus Ay D. sin theta equals Ax divided by Ay E. cos theta equals Ay divided by Ax

1580. The moment of a couple equals the magnitude of one force multiplied by

A. the sum of the two forces B. zero C. the distance from the axis to one force D. the perpendicular distance between the two forces E. the length of the body

1581. Three forces acting at a point are in equilibrium. They can be represented in magnitude and direction by

A. the three sides of a closed triangle taken in order B. a single vector C. three concurrent rays D. three parallel lines E. two perpendicular vectors

1582. The slope of a velocity time graph gives

A. momentum B. distance C. acceleration D. displacement E. force

1583. A person standing in a lift whose cable has snapped and which falls freely experiences an apparent weight of

A. zero B. mg/2 C. m(g plus a) D. 2mg E. mg

1584. For a given pair of surfaces, the limiting static friction is generally

A. independent of the normal force B. equal to the kinetic friction C. zero D. smaller than the kinetic friction E. greater than the kinetic friction

1585. A car moving at 20 m s-1 is brought to rest in 50 m. Its uniform retardation is

A. 0.4 m s-2 B. 2 m s-2 C. 10 m s-2 D. 4 m s-2 E. 8 m s-2

1586. A body moves 4 m east then 3 m north. The magnitude of its displacement is

A. 7 m B. 5 m C. 12 m D. 1 m E. 3.5 m

1587. The gravitational field strength at the surface of a planet of mass M and radius R is

A. GM squared divided by R B. GM divided by R C. R squared divided by GM D. GM divided by R squared E. GMR

1588. A photovoltaic cell converts

A. light directly into electricity B. chemical energy into heat C. mechanical energy into electricity D. heat directly into electricity E. electricity into light

1589. Tidal energy is ultimately derived from

A. nuclear decay in the crust B. wind over the sea C. the gravitational interaction of the Moon and Sun with the oceans D. the Earth's internal heat E. fossil fuels

1590. The angular momentum of a particle of mass m moving with speed v in a circle of radius r is

A. v r divided by m B. mvr C. mv divided by r D. m r squared divided by v E. mv squared r

1591. Torque is a

A. form of energy B. dimensionless quantity C. vector quantity D. unit vector E. scalar quantity

1592. If the radius of a satellite's orbit is increased, its orbital speed

A. becomes zero B. remains unchanged C. doubles D. increases E. decreases

1593. A spinning cricket ball swings in flight because the spin makes the air move

A. at the same speed on both sides B. without viscosity C. in a vacuum D. only along the seam E. faster on one side, lowering the pressure there

1594. A perfume atomizer works because a fast air stream across a tube produces

A. a fall in pressure that draws liquid up the tube B. turbulence in the liquid only C. an electric charge D. a rise in pressure at the nozzle E. a rise in temperature

1595. In Bernoulli's equation, the term rho g h represents

A. kinetic energy per unit volume B. potential energy per unit volume C. the surface energy D. pressure energy per unit volume E. the viscous loss

1596. A small liquid drop is spherical because a sphere has

A. no surface energy B. the greatest density C. zero surface tension D. the smallest surface area for a given volume E. the largest surface area for a given volume

1597. The maximum displacement of a body from its mean position in SHM is called the

A. frequency B. wavelength C. amplitude D. phase E. time period

1598. At the extreme position in SHM, the energy of the body is

A. half kinetic and half potential B. zero C. entirely kinetic D. maximum kinetic and maximum potential together E. entirely potential

1599. The quantity that specifies the state and direction of motion of an oscillating body at a given instant is its

A. time period B. frequency C. spring constant D. phase E. amplitude

1600. Marching soldiers are ordered to break step while crossing a suspension bridge in order to avoid

A. polarization B. damping C. resonance D. diffraction E. interference

Physics