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Free download in PDF Machines and Graphics Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for competitive exams like IIT-JEE, AIIMS, GATE etc. as well as Board exams. These short solved questions or quizzes are provided by Gkseries.
(21)
A disc of mass 4 kg, radius 0.5m and moment of inertia 3 kg-m2 rolls on a horizontal surface so that its center moves with speed 5 m/see. Kinetic energy of the disc is
[A]
50 J
[B]
150 J
[C]
200 J
[D]
400 J
(22)
When a circular wheel rolls on a straight track, then the shape of body centrode and space centrode respectively are
[A]
straight line and parabola
[B]
straight line and circle
[C]
circle and straight line
[D]
circle and parabola
Answer: circle and straight line
(23)
At the instantaneous center, the velocity of the moving lamina at any instant is
[A]
Zero
[B]
Maximum
[C]
Minimum
[D]
Varying
(24)
For a given velocity of a projectile, the range is maximum when the angle of projection is
[A]
30°
[B]
45°
[C]
90°
[D]
0°
(25)
A stone is thrown vertically upwards with a vertical velocity of 49 m/sec. It returns to the ground in
[A]
5 sec
[B]
8 sec
[C]
10 sec
[D]
20 sec
(26)
If a projectile is fired with an initial velocity of 10 m/sec at an angle of 60° to the horizontal, its horizontal and vertical velocity at the highest point of trajectory are
[A]
0 and 5 m/sec
[B]
5 m/sec and 0
[C]
5 V3 m/sec and 0
[D]
5 and 5V3 m/sec
(27)
In a simple harmonic motion, the position of equilibrium is always
[A]
Stable
[B]
Unstable
[C]
Neutral
[D]
None Of The Above
(28)
If A is the amplitude of particle executing simple harmonic motion, then the total energy E of the particle is
[A]
proportional to A
[B]
proportional to A2
[C]
proportional to 1/A2
[D]
independent of A
Answer: proportional to A2
(29)
A particle of mass 2 kg executes simple harmonic motion of frequency 6/71 Hz and amplitude 0.25 m. Its maximum kinetic energy is
[A]
4.5 J
[B]
9.0 J
[C]
12.0 J
[D]
18.0 J
(30)
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]
A
[B]
A/2
[C]
A/V2
[D]
AV2
31
Time period and length of a seconds pendulum respectively are
[A]
1 sec and 99.4 cm
[B]
1 sec and 92.7 cm
[C]
2 sec and 99.4 cm
[D]
2 sec and 92.7 cm
Answer: 2 sec and 99.4 cm
32
A particle is executing simple harmonic motion in a line 1.0 m long. If the time of one complete vibration is 1 sec, then the maximum velocity of the particle is
[A]
1.00 m/sec
[B]
1.57 m/sec
[C]
3.14 m/sec
[D]
6.28 m/sec
33
One Newton is equivalent to
[A]
105 dyne
[B]
106 dyne
[C]
107 dyne
[D]
981 dyne
34
The dimensions of Gravitational Universal constant 'G' are
[A]
M-'L2r2
[B]
M-'L3r2
[C]
M-2L3T2
[D]
M'L3T2
35
One Joule is equivalent to
[A]
9.81 Newton - metre
[B]
1 Newton - metre
[C]
1 kg wt - metre
[D]
1 dyne - metre
36
The unit of rotational inertia of a body in C.G.S system is
[A]
cm4
[B]
kg-cm2
[C]
gm-cm2
[D]
gm-cm3
37
Impulse can be obtained from a
[A]
force-displacement diagram
[B]
force-time diagram
[C]
velocity-time diagram
[D]
velocity-displacement diagram
Answer: force-time diagram
38
A heavy ladder resting on floor and against a vertical wall may not be in equilibrium if
[A]
floor is smooth and wall is rough
[B]
floor is rough and wall is rough
[C]
both floor and wall are rough
[D]
both floor and wall are smooth
Answer: both floor and wall are smooth
39
Intrinisic equation of catenary is given by
[A]
S = C tan q>
[B]
S = C cos cp
[C]
S = C sin cp
[D]
S = C cot
40
Cartesian form of the equation of catenary is
[A]
y = c cosh x/c
[B]
y = c tan x/c
[C]
y = c sin"1 x/c
[D]
All above
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