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Showing 501 to 525 of 3046 questions (page 21 of 122).

501. The chief greenhouse gas responsible for the enhanced greenhouse effect is

A. oxygen B. nitrogen C. carbon dioxide D. argon E. helium

502. The stationary phase in thin layer chromatography is usually

A. silica gel or alumina B. the mobile solvent C. air D. water only E. the sample itself

503. Which quantity has the same dimensions as work?

A. power B. torque C. impulse D. pressure E. force

504. The number of significant figures in 1.230 x 10^4 is

A. 2 B. 3 C. 4 D. 5 E. 6

505. The sum of 2.50 cm and 1.6 cm, expressed to the correct number of decimal places, is

A. 4.10 cm B. 4.1 cm C. 4 cm D. 4.100 cm E. 4.16 cm

506. One radian is approximately equal to

A. 1 degree B. 57.3 degrees C. 3.14 degrees D. 180 degrees E. 6.28 degrees

507. Two vectors of magnitudes 3 and 4 units give a resultant of 7 units. The angle between them is

A. 0 degrees B. 45 degrees C. 90 degrees D. 120 degrees E. 180 degrees

508. The cross product of a vector with itself is

A. its magnitude squared B. a unit vector C. the null vector D. twice the vector E. undefined

509. The magnitude of the cross product of two vectors of magnitudes 2 and 3 units with 30 degrees between them is

A. 1.5 B. 3 C. 5.2 D. 6

510. A force of 5 N acts perpendicular to a spanner at a distance of 0.2 m from the pivot. The torque produced is

A. 0.04 N m B. 1 N m C. 5 N m D. 25 N m E. 10 N m

511. The projection of vector A along vector B is given by

A. A x B B. A.B / |B| C. A.B / |A| D. |A| |B| E. A.B

512. A couple consists of

A. two equal forces in the same direction B. two equal and opposite parallel forces not acting along the same line C. a single force through the centre of mass D. three concurrent forces E. two unequal opposite forces

513. The area under a velocity time graph represents

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

514. A ball is thrown vertically upwards with 19.6 m s-1. The maximum height reached is

A. 9.8 m B. 19.6 m C. 39.2 m D. 4.9 m E. 29.4 m

515. A stone is dropped from rest and falls 45 m. The time taken is about

A. 1.5 s B. 2.1 s C. 3.0 s D. 4.5 s E. 9.0 s

516. The slope of a momentum time graph gives

A. impulse B. force C. velocity D. kinetic energy E. power

517. When a bomb at rest explodes into two unequal fragments, the two fragments have

A. equal kinetic energies B. equal speeds C. equal and opposite momenta D. equal masses E. zero total kinetic energy

518. The coefficient of restitution for a perfectly elastic collision is

B. 0.5 C. 1 D. between 0 and 1 but never 1 E. greater than 1

519. A ball of mass m strikes a wall normally with speed v and rebounds with the same speed. The magnitude of the change in its momentum is

A. zero B. mv C. 2mv D. mv/2 E. 4mv

520. A body moves with uniform velocity. The net force acting on it is

A. equal to its weight B. equal to its momentum C. zero D. proportional to its speed E. maximum

521. One joule is equal to

A. 10^5 erg B. 10^7 erg C. 10^-7 erg D. 10^3 erg E. 10^9 erg

522. The work done in lifting a 5 kg mass through a vertical height of 2 m is about

A. 10 J B. 49 J C. 98 J D. 196 J E. 2.5 J

523. The kinetic energy of a 2 kg body moving at 3 m s-1 is

A. 3 J B. 6 J C. 9 J D. 18 J E. 12 J

524. A crane lifts a 100 kg load at a steady 2 m s-1. The power developed is about

A. 200 W B. 980 W C. 1960 W D. 3920 W E. 490 W

525. If the momentum of a body is doubled, its kinetic energy becomes

A. unchanged B. double C. four times D. half E. eight times

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