A satellite is said to move in a synchronous orbit if it moves at an altitude of 36,000 km with a maximum velocity of about 11,000 km per hour 8000 km per hour 9000 km per hour 7000 km per hour TRUE ANSWER : ? YOUR ANSWER : ?
A glass ball is shot to hit a wall from a point on a smooth floor. If the ball returns back to the point of projection in twice the time taken in reaching the wall, the coefficient of restitution between the glass ball and the wall is 0.5 0.33 0.25 0.4 TRUE ANSWER : ? YOUR ANSWER : ?
A ladder of weight 'w' rests against a smooth vertical wall, and rests on rough horizontal ground, the coefficient of friction between the ladder and the ground being 1/4. The maximum angle of inclination of the ladder to the vertical, if a man of weight 'w' is to walk to the top of it safely, is tan'1 x, where x is 1/3 1/4 4 3 TRUE ANSWER : ? YOUR ANSWER : ?
A block of weight 50 kg is placed on a horizontal plane. When a horizontal force of 18 kg is applied, the block is just on the point of motion. The angle of friction is 19° 48' 17° 48' 18° 48' 20° 48' TRUE ANSWER : ? YOUR ANSWER : ?
If the radius of the earth is 600 km the height of a mountain above sea level at the top of which a beat seconds pendulum at sea level, looses 27 seconds a day, is 500 meters 2000 meters 1500 meters 1000 meters TRUE ANSWER : ? YOUR ANSWER : ?
If the kinetic energy and potential energy of a simple harmonic oscillator of amplitude A are both equal to half the total energy, then the displacement is equal to A/2 A A√2 A/√2 TRUE ANSWER : ? YOUR ANSWER : ?
The masses of two balls are in the ratio of 2 : 1 and their respective velocities are in the ratio of 1 : 2 but in opposite direction before impact. If the coefficient of restitution is ½, the velocities of separation of the balls will be equal to Original velocity in the opposite direction Half the original velocity in the same direction Original velocity in the same direction Half the original velocity in the opposite direction TRUE ANSWER : ? YOUR ANSWER : ?
The moment of inertia of a circular lamina of diameter ‘d’, about an axis perpendicular to the plane of the lamina and passing through its centre, is πd⁴/32 πd⁴/16 πd⁴/24 π/64 (D⁴ + d⁴) TRUE ANSWER : ? YOUR ANSWER : ?