1.Figure given below shows the motion of the body. Calculate its displacement.
|
(a)
6 m
|
(b)
7 m
|
|
(c)
8 m
|
(d)
23 m
|
|
2.
Acceleration
due to uniform velocity of a body is:
|
|
(a)
Positive
|
(b)
Negative
|
|
(c)
Maximum
|
(d)
Zero
|
|
3.
Third
equation of motion is independent of:
|
|
(a)
Time
|
(b)
Displacement
|
|
(c)
Velocity
|
(d)
Acceleration
|
|
4.
What is the speed of
the cyclist between two points S1 and S2 as shown in
figure.
|
(a)
10 km h-1
|
(b)
20 km h-1
|
|
(c)
30 km h-1
|
(d)
50 km h-1
|
|
5.
What will
be the velocity of a body when it starts its motion from rest and after 5s
its acceleration becomes 2 ms-2
|
|
(a)
5 ms-1
|
(b)
10 ms-1
|
|
(c)
25 ms-1
|
(d)
50 ms-1
|
|
6.
What is the velocity of an object when it
reaches from point P to point Q in 2s along a semicircle of radius 2m?
|
(a)
zero
|
(b)
1 ms-1
|
|
(c)
2 ms-1
|
(d)
4 ms-1
|
|
7.
The S.I
unit of weight is;
|
|
(a)
Gram
|
(b)
kilogram
|
|
(c)
Pound
|
(d)
Newton
|
|
8.
What is
the acceleration produced by a force of 0.5 N applied on a body of mass 0.1
kg?
|
|
(a)
0.1 ms-2
|
(b)
0.5 ms-2
|
|
(c)
1 ms-2
|
(d)
5 ms-2
|
|
|
9.
Three
masses which are connected by a mass less spring as shown in figure. What
will be the value of force F2? 
|
(a)
15 N
|
(b)
18 N
|
|
(c)
24 N
|
(d)
30 N
|
|
10.
Rate of
change of momentum is
|
|
(a)
Impulse
|
(b)
Force
|
|
(c)
Torque
|
(d)
Velocity
|
|
11.
A body
moves from point P to point Q with a speed of 6 ms-1 along a
straight Line then from Q to P with a speed of 4 ms-1. What is its
average speed over the entire trip?
|
|
(a)
4 ms-1
|
(b)
4.8 ms-1
|
|
(c)
5 ms-1
|
(d)
5.5 ms-1
|
|
12.
What is
the value of impulse in the force-time curve as shown in figure.
|
(a)
1200 N-s
|
(b)
1350 N-s
|
|
(c)
1500 N-s
|
(d)
1650 N-s
|
|
13.
Impulse
has always changed.
|
|
(a)
Energy
|
(b)
Momentum
|
|
(c)
Velocity
|
(d)
Acceleration
|
|
14.
In
one-dimension elastic collision of two bodies of same masses, what will
Happen? When a moving body is colliding with the rest one;
|
|
(a)
Their velocities will be interchanged
|
(b)
Velocities of both bodies will be zero
|
|
(c)
Moving body will continue its motion
|
(d)
Moving body will come at rest and the rest one will start its motion
|
|
15.
In
projectile motion, the horizontal component of acceleration of a body is;
|
|
(a)
Zero
|
(b)
Accelerated
|
|
(c)
Decelerated
|
(d)
Maximum
|
|
16.
At what
angle a projectile body gains its maximum height
|
|
(a)
0°
|
(b)
45°
|
|
(c)
60°
|
(d)
90°
|
|
17.
A
rocket is working on basis of
|
|
(a)
Newton’s First law
|
(b)
Newton’s 2nd law
|
|
(c)
Newton’s 3rd law
|
(d)
All of these
|
|
18.
The
vertical and horizontal distances will be equal if angle of projection is:
|
|
(a)
45°
|
(b)
56°
|
|
(c)
66°
|
(d)
76°
|
|
19.
The
quantitative measure of inertia of a body is its:
|
|
(a)
Mass
|
(b)
Weight
|
|
(c)
Velocity
|
(d)
Momentum
|
Answers - (b)
7 m
- (d)
Zero
- (a)
Time
- (c)
30 km h-1
- (b)
10 ms-1
- (c)
2 ms-1
- (d)
Newton
- (d)
5 ms-2
- (c)
24 N
- (b)
Force
- (c) 5
ms-1
- (b)
1350 N-s
- (b)
Momentum
- (d)
Moving body will come at rest and the rest one will start its motion
- (a)
Zero
- (d)
90°
- (d)
All of these
- (d)
76°
- (a)
Mass
1.
When the magnitude of distance and displacement are equal?
ans.
When the motion is in
a fixed direction. 2.
Is it necessary, when the acceleration of a body is zero then
its velocity is also zero?
ans.
No, it's not necessary for the velocity of a body to be zero
when its acceleration is zero. If a body is moving at a constant velocity, its
acceleration is zero even though it has a non-zero velocity. For example, if
you throw a ball straight up into the air, at the highest point of its
trajectory it is zero velocity but having a non-zero acceleration.
|
|
16.
If you kick a stone in 1/100 seconds and 1/10 seconds time intervals. In which
Condition you hurt most?
ans.
Kicking a stone in 1/100 seconds will hurt your foot more
than kicking it in 1/10 seconds because of the higher impact force. 19. At what projected angle the horizontal range and maximum height are equal?
|
21. How has the speed of a rocket increased?
ans.
By increasing the acceleration of the rocket which can be
achieved by decreasing the mass of the rocket
Rocket
burns the fuel which decrease the net mass (Δm), increasing the acceleration
and rocket get up thrust.
3.3 Numerical problems
1.
A train moves with a uniform velocity of 24 ms-1.
The driver applies the Brakes, and the train comes to rest with a uniform
retardation in 12 s. Find (i) The retardation, (ii) velocity of the train after
4 sec and (ii) distance travels by train after the brakes are applied.
6.
What is the recoil velocity of 6 kg gun if its shoots a 9 g bullet
out of the muzzle at velocity of 350 ms-1.
9.
A cricket ball is hit upward at an angle 45° with velocity of
20 ms-1, find (a) The maximum height (b) time of flight (c) How far
away it hits the ground.
