A particle is dropped from the top of a tower 60 m high and another is projected upwards from the foot of the tower to meet the first particle at a height of 15.9 m. The velocity of projection of the second particle is 16 m/sec 20 m/sec 22 m/sec 18 m/sec TRUE ANSWER : ? YOUR ANSWER : ?
A Second's pendulum gains 2 minutes a day. To make it to keep correct time its length Must be increased Is not changed but weight of the bob is increased Must be decreased Is not changed but weight of the bob is decreased TRUE ANSWER : ? YOUR ANSWER : ?
A vehicle weighing w kg is to run on a circular curve of radius r. If the height of its centre of gravity above the road level is h and the distance between the centres of wheels is 2a, the maximum velocity, in order to avoid over turning, will be 4√(gra/h) ∛(gra/h) gra/h √(gra/h) TRUE ANSWER : ? YOUR ANSWER : ?
The ratio of the speed of a rolling cylinder to the speed of sliding cylinder is Greater than 2 Less than 1 Between 1 and 2 Equal to 1 TRUE ANSWER : ? YOUR ANSWER : ?
The potential energy of a particle falling through a straight shaft drilled through the earth (assumed homogenous and spherical) is proportional to (where r is the distance of’the particle from centre of the earth) r2 r 1/r log r TRUE ANSWER : ? YOUR ANSWER : ?
A hoop of radius 3 m weighs 100 kg. It rolls along a horizontal floor so that at its centre of mass has a speed of 200 mm/sec. The work required to stop the hoop is 6 J 2 J 4 J 8 J TRUE ANSWER : ? YOUR ANSWER : ?
Instantaneous center is at infinity when the angular velocity is Minimum Constant Zero Maximum TRUE ANSWER : ? YOUR ANSWER : ?
The centre of gravity of a plane lamina will not be at its geometrical centre if it is a Circle Rectangle Right angled triangle Equilateral triangle TRUE ANSWER : ? YOUR ANSWER : ?
Power can be expressed as Work/energy Work × time Work/distance Work/time TRUE ANSWER : ? YOUR ANSWER : ?
A solid sphere of mass M and radius R rolls down a plane inclined at 0 with the horizontal. The acceleration of sphere is (where g is acceleration due to gravity) (5/7) g sin0 (2/5) g sin 0 (3/7) g sin 0 (1/3) g sin0 TRUE ANSWER : ? YOUR ANSWER : ?