| 1 |
To get a resultant displacement of 10 m, two displacement vectors of magnitude 6 m and 8 m should be combined |
Parallel
Antiparallel
At angle 60<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
Perpendicular to each other
|
| 2 |
The time of flight of a projectile motion equal to |
half of the time to reach maximum height
twice the time to reach maximum height
one fourth of time to reach maximum height
time to reach maximum height
|
| 3 |
For maximum linear distance of travel, a projectile must be fired at an angle of |
0<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
45<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
90<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
60<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
|
| 4 |
The velocity of a projectile is maximum |
at the point of projection
just before striking the ground
at none of them
at both of them
|
| 5 |
The vertical and horizontal range will be equal id angle of projection is |
76<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
45<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
60<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
120<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
|
| 6 |
The projectile attains maximum horizontal range when it is projected at an angle of |
30<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
45<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
60<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
75<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
|
| 7 |
The horizontal range of projectile, at a certain place, depends upon |
the mass of the projectile
velocity of projection
angle of projection
angle as well as velocity of projection
|
| 8 |
A particle of mass 0.5 g moving along x-axis is located of x1= 15 m at t1= 5s and x2= 33 m at t2= 13s its average velocity is |
6 m s<sup>-1</sup>
2.45 m s<sup>-1</sup>
2.25 m s<sup>-1</sup>
4.45 m s<sup>-1</sup>
|
| 9 |
The horizontal component of a projectile moving with initial velocity of 500 ms-1at an angle 60° to x-axis is |
500 ms<sup>-1</sup>
1000 ms<sup>-1</sup>
250 ms<sup>-1</sup>
Zero
|
| 10 |
The vertical component of velocity of a projectile during its motion is minimum |
at the time of projection
at the highest point
just before hitting the plane of projection
all of them
|
| 11 |
During the projectile motion, the horizontal component of velocity |
changes with time
remains constant
becomes zero
decreases with time
|
| 12 |
The projectile motion is composed of |
horizontal motion only
vertical motion only
horizontal and vertical motion
none of them
|
| 13 |
The path (or trajectory) described by a projectile is |
a parabola
a hyperbola
a circle
a straight line
|
| 14 |
The path described by a projectile is called its |
orbit
trajectory
range
distance
|
| 15 |
Which of the following is not a projectile |
a bullet fired from a gun
a space ship
a football in air
an artillery shell
|
| 16 |
An object thrown upward with an initial velocity at certain angle with the horizontal and moving freely under the action of gravity is called |
a rocket
an aeroplane
a projectile
a ballon
|
| 17 |
Distance covered by a freely falling body in 2 sec will be |
4.9 m
19.6 m
29.2 m
44.1 m
|
| 18 |
The artillery shells travel along parabolic paths under the influence of |
magnetic field
electric field
electromagnetic field
gravitational field
|
| 19 |
An object thrown in arbitrary direction in space with an initial velocity and moving freely under gravity will follow |
a circular path
a straight line
a hyperbola
a parabola
|
| 20 |
The motion of a projectile is |
one dimension
two dimension
three dimension
all of them
|
| 21 |
The motion in a plane is the motion in |
one dimension
two dimension
three dimension
four dimension
|
| 22 |
The motion of a body in a straight line is the motion in |
one dimension
two dimension
three dimension
four dimension
|
| 23 |
If m is the mass of the gases ejected per second with velocity v relative to the rocket of mass M, then the acceleration of rocket is |
a = M/mv
a = mM/v
a = mv/M
a = v/mm
|
| 24 |
A rocket carries its own fuel in the form of |
liquid only
liquid or solid
liquid and solid
liquid or solid and oxygen
|
| 25 |
A typical rocket consists of fuel |
more than 60% of launch mass
less than 60% of launch mass
less than 80% of launch mass
more than 80% of launch mass
|
| 26 |
A typical rocket ejects the burnt gases at speeds over |
400 ms<sup>-1</sup>
40000m s<sup>-1</sup>
40000 ms<sup>-1</sup>
60000 ms<sup>-1</sup>
|
| 27 |
A typical rocket consumes about |
100 kg s<sup>-1</sup>of fuel
1000 kg s<sup>-1</sup>of fuel
10000 kg s<sup>-1</sup>of fuel
100000 kg s<sup>-1</sup>of fuel
|
| 28 |
Flight of rocket in the space is an example of |
Newton's first law
Newton's third law
Newton's second law
all of them
|
| 29 |
When a shall explodes a mid-air, the total momentum of its fragments is |
less than the momentum of shell
equal to the momentum of shell
greater than the momentum of shell
none of them
|
| 30 |
When a shell explodes in mid-air, its fragments fly off in |
only one direction
in two direction
different directions
a particular direction
|
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