Physics Multiple Choice Questions (M.C.Qs) MDCAT Topic #2 Motion and Forces

Multiple Choice Questions (M.C.Qs) MDCAT Topic #2 Motion and Forces

Q.1  At which angle,the K.E at maximum height will be 25 % of its initial K.E

A) 30'

B) 45'

C) 60'

D) 90'

 Q.2  A body moves in semicircle of radius 'r'.The ratio of displacement to distance is

A) π/2 

B) 2/π

C) 3/π

D) 4π

 Q.3  A car is going on motorway from Lahore to Islamabad ,suddenly its accelerater and breaks fail then in which direction impulse will be with velocity

A) 90 degree

B) 180 degree 

C) 0 degree 

D) 45 degree 

Q.4  At maximum height of projectile,the angle between velocity and acceleration will be

A)  90

B) 180

C) 270 

D) 360

Q.5  When the slope of velocity time graph is zero,it means which quantity must be zero

A) Displacement

B) Velocity 

C) Acceleration 

D) Mass

Answers : 
Q.1  C
Q.2  B
Q.3  B
Q.4  A
Q.5  £
Explanations:
Q.1
Answer is 60 degree because at maximum height only horizontal component is there,when  we will put the 60 degree angle  in  K.E formula at maximum height we  will get 1/4 of initial K.E
Q.2
 Solution: 
Use formula
2r / πr
When the body moves in semicicle then we get answer by dividing 2r/πr.Hence B is correct option.
Q.3  
 In this case because breaks and acceleraters are totaly failed so only road friction is there due to which impulse and velocity will have 180 degree angle with  each other.
Q.4 

At highest point velocity is horizontal and acceleration is always vertical.Hence angle always be 90 degree at maximum height
Q.5