Physics

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Showing 526 to 550 of 1648 questions (page 22 of 66).

526. Energy production in the Sun is mainly due to

A. nuclear fission B. chemical combustion C. nuclear fusion D. radioactive decay of uranium E. gravitational contraction alone

527. Which radiation has the greatest penetrating power?

A. beta B. gamma C. neutron in air only D. alpha E. proton

528. In a nuclear reactor, the moderator is used to

A. slow down fast neutrons B. control the coolant flow C. shield the operators D. increase the fuel temperature E. absorb excess neutrons

529. Which quantity has the same dimensions as work?

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

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

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

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

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

532. One radian is approximately equal to

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

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

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

534. The cross product of a vector with itself is

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

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

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

536. 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. 25 N m B. 5 N m C. 10 N m D. 1 N m E. 0.04 N m

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

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

538. A couple consists of

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

539. The area under a velocity time graph represents

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

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

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

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

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

542. The slope of a momentum time graph gives

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

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

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

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

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

545. 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. 4mv B. 2mv C. zero D. mv E. mv/2

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

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

547. One joule is equal to

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

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

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

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

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

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

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

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