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
what is wrong for a body having uniform circular motion?
  • Speed of the body is constant
  • Acceleration is directed towards the center
  • Velocity and Acceleration vector are having an angle 45°
  • none of the above
which of the following is not a projectile motion
  • A football thrown at an angle
  • A bomb falling from the aircraft
  • A parachutar falling from aero-plane
  • None of these
A football is kicked into the air at an angle of 30 °  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
Which of the following is correct expression for Projectile?
  • Range $R= \frac {2u_xu_y}{g}$
  • Magnitude of velocity at height $h=\sqrt {u^2+2gh}$
  • Time taken $T=\frac {2u_x}{g}$
  • None of these
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 Following statement are made about this motion STATEMENT A: The angle of projection is given by tan-12 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
Four statement are made about the projectile motion STATEMENT -1: Horizontal velocity remains same through out the motion STATEMENT -2: The trajectory 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
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 when it is at the peak of its trajectory.
  • Horizontal velocity changes in the projectile motion
  • none of the above
which of the following is incorrect expression for three dimensional motion?
  • $\mathbf{a}=\frac {d\mathbf{v}}{dt}=\frac {d^2x}{dt^2}\mathbf{i}+\frac {d^2y}{dt^2}\mathbf{j}+\frac {d^2z}{dt^2}\mathbf{k}$
  • $\mathbf{a}=\mathbf{v} \frac {d\mathbf{v}}{d\mathbf{r}}$
  • $\mathbf{v}=\frac {d\mathbf{r}}{dt}=\frac {dx}{dt}\mathbf{i} + \frac {dy}{dt}\mathbf{j}+\frac {dz}{dt}\mathbf{k}$
  • None of these
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
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 ground
  • B will reach the ground in less time then A
  • A will reach the ground in less time then B
A parachuter falls from an aero-plane moving with uniform horizontal velocity.Which of the following is false
  • when he land on the surface,he will be just below the aero-plane
  • 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
The two vectors X and Y are of same length 5 units each. What is the range for the length of addition of these two vectors?
  • (0,10)
  • (0,5)
  • None of these
which of these operations are valid in vectors
  • Addition of two vector
  • Addition of vector with scalar
  • A vector quantity in the denominator of the expression
  • None of these
A and B are vector quantities .Which of these will not be vector quantity?
  • A + B
  • A-B
  • A X B
  • A.B
Vector X and Y are given as X=i+j+k ,Y=i-j-k Which of these are not true?
  • $X \times Y = 0$
  • $X.Y=-1$
  • $2X=2i+2j+2k$
  • None of these
Is vector i+j+k a unit vector?
  • True
  • False
which is of these is not a vector quantity?
  • Velocity
  • Work
  • Force
  • Displacement
Which is of these is correct?
  • $A + B$
  • $A - B= B -A$
  • $A \times B=B \times A$
  • None of these
A and B are vector quantities .Which of these will be correct equation?
  • $ \frac {d}{dt}( A.B) = A. \frac {dB}{dt} + \frac {dA}{dt} .B$
  • $ \frac {d}{dt}( A \times B) = A \times \frac {dB}{dt} + \frac {dA}{dt} \times B$
  • $A.A=|A|^2$
  • All the above
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