WorksheetsReflection 9th
Total questions: 19
Worksheet time: 35mins
A ship of mass 3 x 107 kg initially at rest is pulled by a force of 5 x 104 N through a distance of 3m. Assuming that the resistance due to water is negligible, the speed of the ship is
1.5m/s
1.1m/s
0.1m/s
0.5m/s
An object of mass 2 kg is sliding with a constant velocity of 4 m/s on a friction less horizontal table. The force required to keep the object moving with the same velocity is:
32N
0N
8N
4N
A water tank filled upto 2/3 of its height is moving with a uniform speed. On sudden application of the brake, the water in the tank would
Move backward
Come to the rest
Move forward
Be unaffected
Which of the following situations involves the Newton’s second law of motion?
A force can stop a lighter vehicle as well as a heavier vehicle which are moving
A force exerted by a lighter vehicle on collision with a heavier vehicle results in both the (vehicles coming to a standstill
A force can accelerate a lighter vehicle more easily than a heavier vehicle which are moving
A force exerted by the escaping air from a balloon in the downward direction makes the balloon to go upwards
Newton’s first law of motion says that a moving body should continue to move forever , unless some external forces act on it. But a moving cycle comes to rest after some time if we stop pedaling it. Can you choose the correct reason for the stoppage of cycle?
i. Air resistance
ii. Gravitational pull of the earth
iii. Friction of the road
iii. Heat of the environment
Choose the correct option:
(iii) and (iv)
(i) and (iii)
(i) and (ii)
(ii) and (iii)
A man wearing a bullet-proof vest stands on roller skates. The total mass is 80 kg. A bullet of mass 20 g is fired at 400 m/s. It is stopped by the vest and falls to the ground. What is then the velocity of the man?
0.1 m/s
0.01 m/s
1 m/s
0 m/s
In the following example, try to identify the number of times the velocity of ball changes:
“A football player kicks a football to another player of his team who kicks the football towards the goal. The goalkeeper of the opposite team collects the football and kicks it towards a player of his own team.”
Three times
Four times
Five times
Six times
The action and reaction forces referred to in the third law
May act on different objects
Must act on different objects
Must act on the same object
Need not be equal in magnitude but act in the same direction
The object shown below moves with constant velocity. Two forces are acting on the object.
Considering negligible friction , the resultant force will be
3 N towards left
5 N towards right
10 N towards left
19 N towards left
.A light inextensible string that goes over a smooth fixed pulley as shown in the figure connects two blocks of masses 0.36 kg and 0.72 kg. Taking g = 10 m/s^2, find the w tension by the string on the block of mass 0.36 kg during the first second after the system is relesed from rest.
4/3mg
2/3mg
5/3mg
1/3mg
1) In triangle ABC, if AB=BC and ∠B = 50°, ∠A will be:
50°
110°
65°
130°
If X and Y are the midpoints of equal sides AB and AC of a triangle ABC. Then:
BY=AC
BY=AY
CX=AB
BY = CX
PQR is an isosceles triangle in which altitudes QE and RF are drawn to equal sides PR and PQ respectively. Then:
QE>RF
QE<RF
QE=RF
None of the above
If ABC and DBC are two isosceles triangles on the same base BC. Then:
∆ABD ≡ ∆ACD
∆ABC ≡ ∆ACD
∆CBD ≡ ∆ACB
None of the above
In the given figure, PS is the median then ∠QPS?
40o
50o
80o
90o
In the given figure, if the exterior angle is 135o then ∠P is:
45o
55o
80o
90o
In triangles ABC and DEF, AB = FD and ∠A = ∠D. The two triangles will be congruent by SAS axiom if:
BC = EF
AC = DE
AC = EF
BC = DE
AE||DC and AB=AC, <ABD =?
70o
110o
120o
130o
ABCD and AXYZ are squares. DY =3 and AZ = 2. BY=?
7
8
9
10
