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Showing 151 to 175 of 1648 questions (page 7 of 66).

151. Torque is defined as

A. F . r B. r x F C. r . F D. F x r E. r + F

152. For a body in complete equilibrium, the number of independent conditions that must be satisfied is

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

153. The scalar product of two mutually perpendicular vectors is

A. maximum B. equal to their cross product C. zero D. negative E. unity

154. A vector of magnitude 10 units makes an angle of 30 degrees with the x-axis. Its y-component is

A. 5 units B. 8.66 units C. 10 units D. 2.5 units E. 7.07 units

155. Newton's second law of motion provides the definition of

A. inertia B. force C. momentum D. action and reaction E. mass

156. The SI unit of impulse is equivalent to

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

157. In a perfectly elastic collision, which quantities are conserved?

A. momentum only B. kinetic energy only C. momentum and kinetic energy D. momentum and mass only E. kinetic energy and mass only

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

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

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

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

160. 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. 1:4:9 D. 1:1:1 E. 2:3:4

161. Rocket propulsion is explained on the basis of

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

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

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

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

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

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

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

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

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

166. One kilowatt hour is equal to

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

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

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

168. 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. 1:2 B. 2:1 C. 1:1 D. 1:4 E. 4:1

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

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

170. The SI unit of angular momentum is equivalent to

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

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

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

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

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

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

174. The orbital period of a geostationary satellite is

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

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

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

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