Test Series-7

### Instructions

• Your test contains 12 multiple choice questions with only one answer
• This is 20 min test.Please make sure you complete it in stipulated time
• You can Finish this test any time using 'Submit' button.
• Once finished you get a chance to review all question with correct answers and their solutions.

1.A ball is projected upward at a certain angle with the horizontal .which of the following statement is incorrect. At highest point
• velocity of the projectile is not zero
• acceleration of the projectile is zero
• velocity of the projectile is along the horizontal direction
• None of these

2.what is wrong for a body having uniform circular motion?
• Speed of the body is constant
• Acceleration is directed towards the centre
• Velocity and Acceleration vector are having an angle 45
• none of the above

3.A hunter aims his guns and fires a bullet directly at a monkey on a tree.At the instant bullet leaves the gun,the monkey drops. The bullet
• Misses to hit the monkey
• Hits the monkey
• cannot be said
• None of these

4.Two bullets A and B are fired horizontally with speed v and 2v respectively.which of the following is true
• Both will reach the ground in Same time
• Bullet with speed 2v will cover more horizontal distance on the groud
• B will reach the ground in less time then A
• A will reach the ground in less time then B

5.A football is kicked into the air at an angle of 30 degrees with the horizontal. At the very top of the ball's path, its velocity is
• entirely horizontal
• both vertical and horizontal
• not enough information given to know.
• entirely vertical

6. Which of the following statements are true
• The time that a projectile is in the air is dependent upon the vertical component of the initial velocity.
• The vertical acceleration of a projectile is 0 m/s/s when it is at the peak of its trajectory.
• Horizontal velocity changes in the projectile motion
• none of the above

7. which of the following is incorrect expression for three dimensional motion
• a=dv/dt=(d2x/dt2)i+(d2y/dt2)j+(d2z/dt2)k
• a=vdv/dr
• v=dr/dt=(dx/dt)i + (dy/dt)j+(dz/dt)k
• None of these

STATEMENT -1 : Horizontal velocity remains same through out the motion
STATEMENT -2 : The trajactory is a parabola
STATEMENT -3 : Acceleration of the projectile is vertically upwards
STATEMENT -4 : Momentum remains constants through out the motion
which one of the following is correct
• All the statement are correct
• Statement 1,2 and 4 are correct
• Statement 1,2 and 3 are correct
• Statement 2,3 and 4 are correct

9.which of the following is not a projectile motion
• A football thrown at an angle
• A bomb falling from the aircraft
• A parchutor falling from aeroplane
• None of these

10.Which of the following is correct expression for Projectile
• Range=2uxuy/g
• Magnitude of velocity at height h=(u2+2gh)1/2
• T=2ux/g
• None of these

11. The trajectory of a projectile in a vertical plane is given by
y=2x-4x
2
where x and y are the horizontal and vertical distance
STATEMENT A : The angle of projection is given by tan -1 2
STATEMENT B :The Range of the Projectile is .5 units
• A and B both are correct
• Only A is correct
• Only B is correct
• Both A and B are wrong

12. A parachuter falls from an aeroplane moving with uniform horizontal velocity.Which of the following is false
• when he land on the surface,he will be just below the aeroplane
• A person sitting in the aeroplane will see the parachuter going vertically downward
• when he land on the surface,he would left behind the aeroplane
• none of these