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Showing 2601 to 2625 of 3046 questions (page 105 of 122).

2601. Which of the following pairs does not have the same dimensions?

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

2602. If the rectangular components of a vector are equal in magnitude, the vector makes an angle with the x-axis of

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

2603. The magnitude of the vector 3i + 4j - 12k is

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

2604. The torque of a force about an axis is zero when the line of action of the force

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

2605. The single force that balances a set of concurrent forces is called the

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

2606. 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 differ in magnitude only D. both are zero E. they are equal

2607. Newton's third law action and reaction forces

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

2608. Newton's first law of motion gives the definition of

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

2609. A body is projected at 10 m s-1 at 60 degrees to the horizontal. Its horizontal component of velocity is

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

2610. When two bodies of equal mass collide elastically in one dimension, they

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

2611. In a perfectly inelastic collision, the quantity that is not conserved is

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

2612. 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. 20.4 m D. 15.3 m E. 1.02 m

2613. The weight of a body at the equator compared with its weight at the poles is

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

2614. The work done by a variable force is obtained from a force displacement graph as

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

2615. The orbital speed required for a satellite in a low Earth orbit is about

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

2616. The escape velocity from a planet is independent of

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

2617. One watt is equal to

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

2618. The elastic potential energy stored in a spring of spring constant k compressed by x is

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

2619. The SI unit of angular acceleration is

A. rad s-2 B. rad s-1 C. m s-2 D. N m E. rev s-1

2620. An ice skater spinning with arms outstretched pulls the arms inwards. The angular velocity

A. stays the same B. becomes zero C. decreases D. increases E. reverses

2621. The moment of inertia of a thin circular hoop of mass M and radius R about its central axis is

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

2622. The orbital speed of a satellite at distance r from the centre of the Earth is

A. sqrt(2GM/r) B. sqrt(GMr) C. sqrt(GM/r) D. GM/r2 E. GM/r

2623. A body moving in a circle with increasing speed has

A. tangential acceleration only B. centripetal acceleration only C. both centripetal and tangential acceleration D. constant velocity E. zero acceleration

2624. A hydraulic press works on the principle stated by

A. Pascal B. Torricelli C. Archimedes D. Bernoulli E. Stokes

2625. The upthrust on a body immersed in a fluid equals the weight of

A. the fluid above the body B. the body in air C. the body D. the container E. the fluid displaced

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