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Free download in PDF Machines and Graphics Multiple Choice Questions with 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.
61
The dimensions of centrifugal force are
[A]
M1 L2 T2
[B]
M'L'T1
[C]
M'L'T2
[D]
M'L-'T2
62
A quantity measured in the C.G.S system of units has dimensions M"2L3 T3/2. What numerical factor would be required to convert the quantity to SI units ?
[A]
1
[B]
100
[C]
1/100
[D]
1/10000
63
In SI units, the units of force and energy are respectively
[A]
Newton and watt
[B]
Dyne and erg
[C]
Newton and joule
[D]
kg-wt and joule
64
The ratio of unit of force in gravitational system to that in absolute system is
[A]
1
[B]
g
[C]
1/g
[D]
none of the above
65
A quantity whose dimensions are M2L2 T3 could be the product of
[A]
Force And Pressure
[B]
Mass And Power
[C]
Energy And Velocity
[D]
Force And Velocity
66
Joule is the unit of
[A]
Power
[B]
Impulse
[C]
Work
[D]
Momentum
67
The ratio of kinetic energy and potential energy of a simple harmonic oscillator, at a displacement equal to half its amplitude is given by
[A]
1:2
[B]
1:1
[C]
2:1
[D]
3:1
68
The maximum displacement of a particle executing S.H.M. corresponds to
[A]
zero potential energy and maximum kinetic energy
[B]
zero kinetic energy and maximum potential energy
[C]
maximum kinetic energy and maxi-mum potential energy
[D]
minimum kinetic energy and minimum potential energy
Answer: zero kinetic energy and maximum potential energy
69
The time period of a simple pendulum depends on
i) mass of suspended particle
ii) length of the pendulum
iii) acceleration due to gravity The correct answer is
[A]
only (i)
[B]
both (ii) and (iii)
[C]
both (i) and (iii)
[D]
all are correct
Answer: both (ii) and (iii)
70
The angle of projection at which the horizontal range and maximum height of a projectile are equal to
[A]
45°
[B]
tan-1 (2)
[C]
tan-' (4)
[D]
tan"1 (1/4)
71
A stone is thrown up a slope of inclination 60° to the horizontal. At what angle to the slope must the stone be thrown so as to land as far as possible from the point of projection ?
[A]
15°
[B]
30°
[C]
45°
[D]
75°
72
A circular disc rotates at n rpm. The angular velocity of a circular ring of same mass and radius as the disc and to have the same angular momentum is
[A]
n rpm
[B]
n/2 rpm
[C]
n/4 rpm
[D]
2n rpm
73
A flywheel of moment of inertia 20 kg-m" is acted upon by a tangential force of 5 N at 2 m from its axis, for 3 seconds. The increase in angular velocity in radian persecond is
[A]
1/2
[B]
3/2
[C]
2
[D]
3
74
Select the correct statement
[A]
The body centrode rolls on the space centrode
[B]
The space centrode rolls on the body centrode
[C]
Both body and space centrodes may role on each other
[D]
The body centrode never touches space centrode
Answer: The body centrode rolls on the space centrode
75
Instantaneous center is at infinity when the angular velocity is
[A]
constant
[B]
zero
[C]
maximum
[D]
minimum
76
A 2 m long ladder rests against a wall and makes an angle of 30° with the horizontal floor. Where will be the instantaneous center of rotation when the ladder starts slipping ?
i) 1.0 in from the wall
ii) 1.732 m from the wall
iii) 1.0 m above the floor
iv) 1.732 m above the floor The correct answer is
[A]
(i) and (iii)
[B]
(i) and (iv)
[C]
(ii) and (iii)
[D]
(ii) and (iv)
77
The angle of projection at which the horizontal range and maximum height of a projectile are equal to
[A]
36°
[B]
45°
[C]
56°
[D]
76°
78
The maximum value of the horizontal range for a projectile projected with a velocity of 98 m/sec is
[A]
98 m
[B]
490 m
[C]
980 m
[D]
1960 m
79
A projectile has maximum range of 40 m on a horizontal plane. If angle of projection is a and the time of flight is 1 second, then sin a must be about
[A]
1/4
[B]
1/3
[C]
1/2
[D]
1/5
80
If the direction of projection bisects the angle between the vertical and the inclined plane, then the range of projectile on the inclined plane is
[A]
zero
[B]
maximum
[C]
minimum
[D]
unpredictable
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