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Showing 1401 to 1425 of 1648 questions (page 57 of 66).

1401. Cobalt 60 is used in medicine mainly as a source of

A. beta particles B. alpha particles C. X-rays D. neutrons E. gamma rays for radiotherapy

1402. A radioactive sample of initial activity A0 has a half life T. Its activity after time 4T is

A. A0/4 B. A0/32 C. A0/2 D. A0/16 E. A0/8

1403. The dimensional formula of Young's modulus is

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

1404. A set of measurements that are closely grouped but far from the true value is described as

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

1405. 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. 0.05 mm E. 0.01 mm

1406. 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

1407. 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

1408. The magnitude of the vector 3i + 4j - 12k is

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

1409. 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

1410. The single force that balances a set of concurrent forces is called the

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

1411. 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

1412. 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

1413. Newton's first law of motion gives the definition of

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

1414. 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

1415. 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

1416. 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

1417. 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

1418. 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

1419. 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

1420. 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

1421. 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

1422. 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

1423. 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

1424. 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

1425. 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

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