A point subjected to a number of forces will be in equilibrium, if
1.sum of resolved parts in any two directions at right angles, are both zero
2.algebraic sum of the forces is zero
3.two resolved parts in any two directions at right angles are equal
4. algebraic sum of the moments of the forces about the point is zero
Posted Date:-2021-05-14 04:42:57
The centre of gravity of a plane lamina will not be at its geometrical centre if it is a
1.circle
2.equilateral triangle
3.rectangle
4.square
Posted Date:-2021-05-14 04:42:57
The frequency of oscillation on moon as compared to that on earth, will be
1.2.44 times more
2.2.44 times less
3.3 times less
4.3 times more.
Posted Date:-2021-05-14 04:42:57
The velocity of a moving body, is
1.a vector quantity
2. a scalar quantity
3.a constant quantity
4.none of these.
Posted Date:-2021-05-14 04:42:57
A geo-stationary satellite is one which orbits the earth with a velocity of rotation of
1.moon
2.earth
3.sun
4.pole
Posted Date:-2021-05-14 04:42:57
A particle moving with a simple harmonic motion, attains its maximum velocity when it passes
1.the extreme point of the oscillation
2. through the mean position
3.through a point at half amplitude
4. none of these.
Posted Date:-2021-05-14 04:42:57
For a self-locking machine, the efficiency should be
1.less than 60%
2.50%
3.more than 50%
4.None of these.
Posted Date:-2021-05-14 04:42:57
From a solid cylinder of height 8 cm and radius 4 cm, a right circular cone is scooped out on the same base and having the same height as that of the cylinder. The c.g. of the remainder is at a height of
1.4.5 cm
2.5.0 cm
3. 5.25 cm
4.5.5 cm.
Posted Date:-2021-05-14 04:42:57
If a ball which is dropped from a height of 2.25 m on a smooth floor attains the height of bounce equal to 1.00 m, the coefficient of the restitution between the ball and floor, is
1.0.25
2.0.5
3.0.67
4.0.33
Posted Date:-2021-05-14 04:42:57
On a ladder resting on a rough ground and leaning against a smooth vertical wall, the force of friction acts
1. downwards at its upper end
2.upwards at its upper end
3.perpendicular to the wall at its upper end
4.zero at its upper end
Posted Date:-2021-05-14 04:42:57
Periodic time of body moving with simple harmonic motion, is
1. directly proportional to its angular velocity
2.directly porportional to the square of its angular velocity
3. inversly proportional to the square of its angular velocity
4.inversely proportional to its angular velocity.
Posted Date:-2021-05-14 04:42:57
A ball of mass 1 kg moving with a velocity of 2 m/sec collides a stationary ball of mass 2 kg and comes to rest after impact. The velocity of the second ball after impact will be
1.zero
2. 0.5 m/sec
3.1.0 m/sec
4.2.0 m/sec.
Posted Date:-2021-05-14 04:42:57
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
1.16 m/sec
2.18 m/sec
3.20 m/sec
4.22 m/sec
Posted Date:-2021-05-14 04:42:57
A rigid body suspended Vertically at a point and oscillating with a small amplitude under the action of the force of gravity, is called
1.simple pendulum
2.compour pendulum
3. Second's pendulum
4.none of these.
Posted Date:-2021-05-14 04:42:57
Centre of gravity of a thin hollow cone lies on the axis of symmmetry at a height of
1.one-half of the total height above base
2.one-third of the total height above base
3.one-fourth of the total height above base
4.none of these.
Posted Date:-2021-05-14 04:42:57
If a body is acted upon by a number of coplaner non-concurrent forces, it may
1. rotate about itself without moving
2.move in any one direction rotating about itself
3.be completely at rest
4.all the above.
Posted Date:-2021-05-14 04:42:57
The centre of gravity of a homogenous body is the point at which the whole
1.volume of the body is assumed to be concentrated
2.area of the surface of the body is assumed to be concentrated
3.weight of the body is assumed to be concentrated
4.all the above.
Posted Date:-2021-05-14 04:42:57
Periodic time of a particle moving with simple harmonic motion is the time taken by the particle for
1.half oscillation
2.quarter oscillation
3.complete oscillation
4.none of these.
Posted Date:-2021-05-14 04:42:57
Pick up the correct statement from the following :
1.If two equal and perfectly elastic smooth spheres impinge directly, they interchange their velocities.
2.If a sphere impinges directly on an equal sphere which is at rest, then a fraction (1 - e2) the original kinetic energy is lost by the impact.
3. If a smooth sphere impinges on another sphere, which is at rest, the latter will move along the line of centres.
4.All the above.
Posted Date:-2021-05-14 04:42:57
Pick up the incorrect statement from the following. In a simple harmonic motion
1.velocity is maximum at its mean position
2.velocity is minimum at the end of the storke
3.acceleration is minimum at the end of the stroke
4.acceleration is zero at the mean position.
Posted Date:-2021-05-14 04:42:57
The Centre of gravity of a 10 x 15 x 5 cm T section from its bottom, is
1.7.5 cm
2.5.0 cm
3.8.75 cm
4.7.85 cm
Posted Date:-2021-05-14 04:42:57
The centre of gravity of a quadrant of a circle lies along its central radius at a distance of
1.0.2 R
2.0.3 R
3.0.4 R
4.0.5 R
Posted Date:-2021-05-14 04:42:57
The direction of projection should bisect the angle between the inclined plane and the vertical for a range of a projectile on inclined plane
1.to be zero
2.to be maximum
3.to be minimum
4. none of the these.
Posted Date:-2021-05-14 04:42:57
The gravitational force makes a satellite go round the earth in a circular orbit, if it is projected with an initial velocity of
1.8.04 km/sec at a height of 285 km
2.11.11 km/sec at a height of 37, 400 km
3.11.26 km/sec, the satellite escapes the pull of the earth
4.All the above.
Posted Date:-2021-05-14 04:42:57
The motion of a bicycle wheel is
1.translatory
2.rotary
3. rotary and translatory
4.curvilinear
Posted Date:-2021-05-14 04:42:57
The motion of a particle moving with S.H.M. from an extremity to the other, constitutes
1. half an oscillation
2.one full oscillation
3.two oscillations
4.none of these.
Posted Date:-2021-05-14 04:42:57
The piston of a steam engine moves with a simple harmonic motion. The crank rotates 120 r.p.m. and the stroke length is 2 metres. The linear velocity of the piston when it is at a distance of 0.5 metre from the centre, is
1. 5.88 m/sec
2.8.88 m/sec
3.10.88 m/sec
4.12.88 m/sec.
Posted Date:-2021-05-14 04:42:57
The point about which combined motion of rotation and translation of a rigid body takes place, is known as
1.Virtual centre
2.Instantaneous centre
3.Instantaneous axis
4.All the above.
Posted Date:-2021-05-14 04:42:57
The practical units of work, is
1.erg
2.joule
3.Newton
4.dyne.
Posted Date:-2021-05-14 04:42:57
The rate of change of displacement of a body with respect to its surrounding, is known
1.velocity
2.acceleration
3.speed
4.none of these.
Posted Date:-2021-05-14 04:42:57
The rotational velocity of a satellite is increased by 450 m per second if its launch is done from equator
1.eastward
2.northward
3.westward
4.southward
Posted Date:-2021-05-14 04:42:57
The velocity ratio of an inclined plane of inclination θ with horizontal for lifting a load is
1. sin θ
2.cos θ
3.tan θ
4.cosec θ.
Posted Date:-2021-05-14 04:42:57
Two parallel forces 20 kg and 15 kg act. In order that the distance of the resultant from 20 kg force may be the same as that of the former resultant was from 15 kg, the 20 kg force is diminished by
1. 5.5 kg
2.6.25 kg
3.8.75 kg
4. 10.5 kg.
Posted Date:-2021-05-14 04:42:57
When a body falls freely under gravitational force, it possesses
1.maximum weight
2.minimum weight
3.no weight
4.no effect on its weight.
Posted Date:-2021-05-14 04:42:57
When a body moves round a fixed axis, it has
1. a rotary motion
2.a circular motion
3.a translatory
4.a rotary motion and translatory motion.
Posted Date:-2021-05-14 04:42:57