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Showing 1176 to 1200 of 3046 questions (page 48 of 122).

1176. Biochemical oxygen demand is a measure of

A. the total dissolved solids B. the hardness of water C. the oxygen required by micro-organisms to decompose organic matter in water D. the acidity of water E. the chlorine content

1177. Primary treatment of waste water consists mainly of

A. ion exchange B. chlorination C. reverse osmosis D. physical removal of suspended solids by screening and sedimentation E. biological oxidation

1178. Photochemical smog is formed mainly from

A. nitrogen oxides and unburnt hydrocarbons in sunlight B. sulphur dioxide and soot C. ammonia and dust D. carbon dioxide and water E. chlorofluorocarbons

1179. Two components can be separated by chromatography because they differ in

A. molar mass only B. density C. their relative affinity for the stationary and mobile phases D. colour E. melting point

1180. The dimensional formula of Young's modulus is

A. [ML2T-2] B. [MLT-2] C. [M0L0T0] D. [ML-1T-2] E. [ML-2T-1]

1181. A set of measurements that are closely grouped but far from the true value is described as

A. accurate but not precise B. both accurate and precise C. free from systematic error D. neither accurate nor precise E. precise but not accurate

1182. A vernier scale has 10 divisions coinciding with 9 divisions of a main scale graduated in millimetres. The least count is

A. 0.1 mm B. 0.9 mm C. 1 mm D. 0.01 mm E. 0.05 mm

1183. Which of the following pairs does not have the same dimensions?

A. work and torque B. force and energy C. impulse and momentum D. frequency and angular velocity E. stress and pressure

1184. If the rectangular components of a vector are equal in magnitude, the vector makes an angle with the x-axis of

A. 0 degrees B. 30 degrees C. 60 degrees D. 90 degrees E. 45 degrees

1185. The magnitude of the vector 3i + 4j - 12k is

A. 13 B. 12 C. 5 D. 19 E. 7

1186. The torque of a force about an axis is zero when the line of action of the force

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

1187. The single force that balances a set of concurrent forces is called the

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

1188. 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 are equal D. both are zero E. they differ in magnitude only

1189. Newton's third law action and reaction forces

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

1190. Newton's first law of motion gives the definition of

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

1191. A body is projected at 10 m s-1 at 60 degrees to the horizontal. Its horizontal component of velocity is

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

1192. When two bodies of equal mass collide elastically in one dimension, they

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

1193. In a perfectly inelastic collision, the quantity that is not conserved is

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

1194. A projectile launched at 45 degrees with a speed of 10 m s-1 has a horizontal range of about

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

1195. The weight of a body at the equator compared with its weight at the poles is

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

1196. The work done by a variable force is obtained from a force displacement graph as

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

1197. The orbital speed required for a satellite in a low Earth orbit is about

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

1198. The escape velocity from a planet is independent of

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

1199. One watt is equal to

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

1200. The elastic potential energy stored in a spring of spring constant k compressed by x is

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

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