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Showing 1826 to 1850 of 3046 questions (page 74 of 122).

1826. The torque of a force about an axis is zero when the line of action of the force

A. acts at the rim B. is parallel to the displacement C. passes through the axis D. has maximum magnitude E. is perpendicular to the axis

1827. The single force that balances a set of concurrent forces is called the

A. couple B. normal reaction C. component D. resultant E. equilibrant

1828. For two vectors A and B, the relation between A x B and B x A is

A. A x B = 2 B x A B. A x B = -B x A C. they differ in magnitude only D. they are equal E. both are zero

1829. Newton's third law action and reaction forces

A. are unequal in magnitude B. occur one after the other C. act on the same body and cancel D. act on different bodies and do not cancel E. act in the same direction

1830. Newton's first law of motion gives the definition of

A. inertia B. force C. impulse D. momentum E. weight

1831. A body is projected at 10 m s-1 at 60 degrees to the horizontal. Its horizontal component of velocity is

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

1832. When two bodies of equal mass collide elastically in one dimension, they

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

1833. In a perfectly inelastic collision, the quantity that is not conserved is

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

1834. A projectile launched at 45 degrees with a speed of 10 m s-1 has a horizontal range of about

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

1835. The weight of a body at the equator compared with its weight at the poles is

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

1836. The work done by a variable force is obtained from a force displacement graph as

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

1837. The orbital speed required for a satellite in a low Earth orbit is about

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

1838. The escape velocity from a planet is independent of

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

1839. One watt is equal to

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

1840. The elastic potential energy stored in a spring of spring constant k compressed by x is

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

1841. The SI unit of angular acceleration is

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

1842. An ice skater spinning with arms outstretched pulls the arms inwards. The angular velocity

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

1843. The moment of inertia of a thin circular hoop of mass M and radius R about its central axis is

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

1844. The orbital speed of a satellite at distance r from the centre of the Earth is

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

1845. A body moving in a circle with increasing speed has

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

1846. A hydraulic press works on the principle stated by

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

1847. The upthrust on a body immersed in a fluid equals the weight of

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

1848. The viscosity of a liquid, as the temperature rises,

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

1849. In a horizontal pipe of varying cross section, the pressure is lowest where the

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

1850. 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 upthrust exceeds the weight D. the acceleration is maximum E. the drag force becomes zero

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