Q.1

If a body is thrown upwards, then the gravitational acceleration is taken as zero.

  • Correct
  • Incorrect
Q.2

The maximum velocity of a particle moving with simple harmonic motion is

  • ω
  • ωr
  • ω2r
  • ω/r
Q.3

The forces which do not meet at one point and their lines of action do not lie on the same plane are known as

  • coplaner concurrent forces
  • coplaner non-concurrent forces
  • non-coplaner concurrent forces
  • none of these
Q.4

The centre of gravity of a right angled triangle lies at its geometrical centre.

  • Correct
  • Incorrect
Q.5

The ideal angle of banking provided on the curves on roads depends upon

  • weight of the vehicle
  • (velocity)2 of the vehicle
  • nature of the road surface
  • coefficient of friction between the road and vehicle contact point
Q.6

The moment of inertia of a square of side (a) about an axis through its centre of gravity is

  • a4/4
  • a4/8
  • a4/12
  • a4/36
Q.7

The law of motion involved in the recoil of gun is

  • Newton's first law of motion
  • Newton's second law of motion
  • Newton's third law of motion
  • none of these
Q.8

The centre of gravity of a triangle lies at a point where its medians intersect each other.

  • True
  • False
Q.9

The velocity ratio of a first system of pulleys with 4 pulleys is

  • 4
  • 8
  • 16
  • 20
Q.10

The maximum mechanical advantage of a lifting machine is

  • 1 + m
  • 1 - m
  • 1 / m
  • m
Q.11

The amplitude is always __________ radius of the circle.

  • equal to
  • less than
  • greater than
Q.12

The forces, which do not meet at one point, but their lines of action lie on the same plane, are known as coplaner non-concurrent forces.

  • Agree
  • Disagree
Q.13

If three forces acting at a point be represented in magnitude and direction by the three sides of a triangle, taken in order, the forces shall be in equilibrium.

  • True
  • False
Q.14

The friction experienced by a body, when at rest, is known as

  • static friction
  • dynamic friction
  • limiting friction
  • coefficient of friction
Q.15

An ideal machine is one whose efficiency is

  • between 60 and 70 %
  • between 70 and 80%
  • between 80 and 90%
  • 100%
Q.16

In a single threaded worm and worm wheel, the number of teeth on the worm isThe diameter of the effort wheel ismm and that of load drum ismm. The velocity ratio is

  • 50
  • 100
  • 150
  • 200
Q.17

In a single threaded worm and worm wheel, the number of teeth on the worm isThe diameter of the effort wheel ismm and that of load drum ismm. The velocity ratio is

  • 50
  • 100
  • 150
  • 200
Q.18

The loss of kinetic energy due to direct impact of two bodies __________ upon the value of coefficient of restitution.

  • depends
  • does not depend
Q.19

The velocity ratio for the third system of pulleys is

  • n
  • n2
  • 2n
  • 2n - 1
Q.20

According to parallel axis theorem, the moment of inertia of a section about an axis parallel to the axis through centre of gravity (i.e. IP) is given by(where, A = Area of the section, IG = Moment of inertia of the section about an axis passing through its C.G., and h = Distance between C.G. and the parallel axis.)

  • IP = IG + Ah2
  • IP = IG - Ah2
  • IP = IG / Ah2
  • IP = Ah2 / IG
Q.21

A non-reversible machine is also called a self-locking machine.

  • Agree
  • Disagree
Q.22

A ladder is resting on a smooth ground and leaning against a rough vertical wall. The force of friction will act

  • towards the wall at its upper and
  • away from the wall at its upper end
  • downward at its upper end
  • upward at its upper end
Q.23

Joule is the unit of

  • force
  • work
  • power
  • velocity
Q.24

Vectors method for the resultant force is also called polygon law of forces.

  • Correct
  • Incorrect
Q.25

If a pendulum is taken 1 km below the earth surface in a mine, it will __________ in time.

  • gain
  • loose
Q.26

The velocity ratio for the third system of pulleys is

  • n
  • n2
  • 2n
  • 2n - 1
Q.27

The velocity ratio of a single purchase crab winch can be increased by

  • increasing the length of the handle
  • increasing the radius of the load drum
  • increasing the number of teeth of the pinion
  • all of the above
Q.28

When a particle moves along a circular path, its acceleration has two components, one is normal component and the other is tangential component of acceleration.

  • True
  • False
Q.29

In order to double the period of simple pendulum, the length of the string should be

  • halved
  • doubled
  • quadrupled
Q.30

One joule means that

  • work is done by a force of 1 N when it displaces a body through 1m
  • work is done by a force of 1 kg when it displaces a body through 1 m
  • work is done by a force of 1 dyne when it displaces a body through 1 cm
  • work is done by a force of 1 g when it displaces a body through 1 cm
Q.31

A machine having an efficiency greater than 50%, is known as

  • reversible machine
  • non-reversible machine
  • neither reversible nor non-reversible machine
  • ideal machine
Q.32

When a body falls freely under gravitational force, it possesses __________ weight.

  • no
  • minimum
  • maximum
Q.33

The moment of inertia of a solid sphere of mass m and radius r is

  • 2mr2/3
  • 2mr2/5
  • mr2
  • mr2/2
Q.34

The velocity of a body on reaching the ground from a height h, is

Q.35

The energy possessed by a body, for doing work by virtue of its position, is called

  • potential energy
  • kinetic energy
  • electrical energy
  • chemical energy
Q.36

The total motion possessed by a body, is called

  • impulsive force
  • mass
  • weight
  • momentum
Q.37

A body of mass m moving with a constant velocity v strikes another body of same mass m moving with same velocity but in opposite direction. The common velocity of both the bodies after collision is

  • v
  • 2v
  • 4v
  • 8v
Q.38

The wheels of a moving car possess

  • potential energy only
  • kinetic energy of translation only
  • kinetic energy of rotation only
  • kinetic energy of translation and rotation both
Q.39

A pendulum which executes one beat per second is known as

  • simple pendulum
  • compound pendulum
  • torsional pendulum
  • second's pendulum
Q.40

When a body falls freely under gravitational force, it possesses __________ weight.

  • no
  • minimum
  • maximum
Q.41

The moment of inertia of a thin rod of mass m and length l,about an axis through its centre of gravity and perpendicular to its length is

  • ml2/4
  • ml2/ 6
  • ml2/8
  • ml2/12
Q.42

If the efficiency of a lifting machine is kept constant, its velocity ratio is __________ propotional to its mechanical advantage.

  • directly
  • inversely
Q.43

If the gravitational acceleration at any place is doubled, then the weight of a body will be

  • g/2
  • g
  • 2g
  • 2g
Q.44

The resultant of two equal forces P making an angle θ, is given by

  • 2 P sin θ /2
  • 2 P cos θ /2
  • 2 P tan θ /2
  • 2 P cot θ /2
Q.45

Mass moment of inertia of a thin rod about its one end is __________ the mass moment of inertia of the same rod about its mid-point

  • same as
  • twice
  • thrice
  • four times
Q.46

The length of a second's pendulum is

  • 94.9cm
  • 99.4cm
  • 100cm
  • 101cm
Q.47

Two equal and opposite parallel forces whose lines of action are different form a couple.

  • Correct
  • Incorrect
Q.48

The moment of inertia of a thin disc of mass m and radius r, about an axis through its centre of gravity and perpendicular to the plane of the disc is

  • mr2/2
  • mr2/4
  • mr2/6
  • mr2/8
Q.49

The motion of a wheel of a car is

  • purely translation
  • purely rotational
  • combined translation and rotational
  • none of these
Q.50

A machine which is not capable of doing any work in the reversed direction, after the effort is removed, is called a reversible machine.

  • True
  • False
0 h : 0 m : 1 s