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Showing 401 to 425 of 1648 questions (page 17 of 66).

401. Torque is defined as

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

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

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

403. The scalar product of two mutually perpendicular vectors is

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

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

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

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

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

406. The SI unit of impulse is equivalent to

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

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

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

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

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

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

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

410. 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. 2:3:4 D. 1:4:9 E. 1:1:1

411. Rocket propulsion is explained on the basis of

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

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

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

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

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

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

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

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

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

416. One kilowatt hour is equal to

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

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

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

418. 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. 1:4 B. 1:1 C. 2:1 D. 1:2 E. 4:1

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

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

420. The SI unit of angular momentum is equivalent to

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

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

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

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

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

423. 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. MR2/4 C. 2MR2/3 D. 2MR2/5 E. MR2/2

424. The orbital period of a geostationary satellite is

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

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

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

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