BAF Shaheen College Dhaka Prctice Half Yearly Examination 2020
Class- Nine (English Version) Subject: Physics (Creative)
Subject Code: 0136
Time: 2 Hours 30 Min Full Marks- 50
[Answer any five of the following questions]
1. Motion of a car
Time ( Seconds) 0 3 5 7 9 11
Velocity ( m/s) 0 4 8 12 12 12
a)Define acceleration. 1
b) What do you understand by g= 9.8 m/s? 2
c) How much distance it will travel in 11 seconds? 3
d) Drawing the velocity- time graph explain the motion of the car. 4 2. Hadi throws a stone of mass 45 gm horizontally with the uniform velocity of 55 m/s.
a) What is Force? 1
b) How can you reduce friction? 2
c) How much distance it will travel in 6 seconds? 3
d) Is it possible to stop the stone within 10m applying a force of 12N? 4 3. A bullet of mass 200gm was fired from a gun of mass 4 kg with the velocity of 320 ms-1.
a) Define Momentum. 1
b) Why does a person sitting in a car at rest lean in the backward direction when the car suddenly starts
to move? 2
c) Calculate the backward velocity of the gun. 3
d) How can you prove the law of conservation of momentum from the above information? 4 4. An object at rest travels 50m in 5 seconds with uniform acceleration.
a) What is called velocity? 1
b) Show that pressure is a derived quantity. 2
c) What will be the velocity of the object after 15 seconds? 3
d) How much time will the object take to travel the next 30m distance? 5 5. A force is applied on a toy car of mass 0.4 kg and it started to move with the acceleration of 0.5 ms-2 on the floor of frictional force 0.5N.
a) What is Inertia? 1
b) What is the difference between nuclear strong force and nuclear weak force? 2
c) Find the force acting on the car. 3
d) What will be the difference between the acceleration on the floor with friction and without friction?-
Explain mathematically. 4
6. An object of mass 110 gm was projected in the vertically upward direction with the velocity of 30 ms-
1. Having gone to the maximum height it fell on the ground.
a) Define energy. 1
b) What do you understand by 200J of work? 2
c) Find the maximum height that the object can go. 3
d) Show that the total energy of the object at the maximum height and just before touching the ground
are equal. 4
7.