A particle of mass is projected with the velocity v making an an

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

121.

The speed of the projectile at its maximum height is half of its initial speed. The angle of projection is

  • 60o

  • 15o

  • 30o

  • 30o

370 Views

122.

A particle moves in the x-y plane according to rule x = a sin ωt and y = a cos ωt. The particle follows

  • an elliptical path

  • a circular path 

  • a parabolic path

  • a parabolic path

377 Views

123.

A particle starts its motion from rest under the action of a constant force. If the distance covered in first 10 s is s1 and that covered in the first 20 s is s2, then

  • s2 = 2s1

  • s2 = 3s1

  • s2 = 4 s1

  • s2 = 4 s1

1104 Views

124.

Two bodies of mass 1 kg have position vectors,bold i with bold hat on top bold space bold plus bold space 2 bold j with bold hat on top bold space bold plus bold k with bold hat on top bold space bold and bold space bold minus 3 bold i with bold hat on top bold space bold minus 2 bold j with bold hat on top bold space bold plus bold k with bold hat on top  respectively.The centre of mass of this system has a position vector

  • negative 2 bold i with hat on top space plus 2 space bold k with hat on top
  • negative 2 bold i with bold hat on top minus bold j with bold hat on top space plus bold k with hat on top
  • 2 bold i with bold hat on top minus bold j with bold hat on top space minus bold k with hat on top
  • 2 bold i with bold hat on top minus bold j with bold hat on top space minus bold k with hat on top
888 Views

Advertisement
125.

If bold F with bold rightwards arrow on top is the force acting on a particle having position vector straight r with rightwards arrow on top space a n d space tau with rightwards arrow on top be the the torque of this force about the origin, then

  • straight r with rightwards arrow on top. straight tau with rightwards arrow on top space not equal to space 0 space and space bold F with bold rightwards arrow on top space. space straight tau with rightwards arrow on top space equals space 0
  • straight r with rightwards arrow on top. straight tau with rightwards arrow on top space greater than space space 0 space and space bold F with bold rightwards arrow on top space. space straight tau with rightwards arrow on top space less than space 0
  • straight r with rightwards arrow on top. straight tau with rightwards arrow on top space equals space space 0 space and space bold F with bold rightwards arrow on top space. space straight tau with rightwards arrow on top space equals space 0
  • straight r with rightwards arrow on top. straight tau with rightwards arrow on top space equals space space 0 space and space bold F with bold rightwards arrow on top space. space straight tau with rightwards arrow on top space equals space 0
327 Views

126.

The distance travelled by a particle starting from rest and moving with an acceleration 4/3 ms-2 in the third second is

  • 6 m

  • 4 m

  • 10/3

  • 10/3

521 Views

127.

A particle shows distance -time curve as given in this figure. The maximum instantaneous velocity of the particle is around the point

  • B

  • C

  • D

  • D

597 Views

128.

A particle moves in a straight line with a constant acceleration. It changes its velocity from 10 ms-1 to 20 ms-1 while passing through a distance 135 m in t second.  The value of t is 

  • 10

  • 1.8

  • 12

  • 12

320 Views

Advertisement
Advertisement

129.

A particle of mass is projected with the velocity v making an angle of 45o with the horizontal. 
When the particle  lands on the level ground the magnitude of the change in its momentum will be

  • 2 mv

  • mv divided by square root of 2
  • square root of 2 mv
  • square root of 2 mv


C.

square root of 2 mv

The horizontal momentum does not change. The change in vertical momentum is 

mv sin θ - (-mv sin θ ) 

=
259 Views

Advertisement
130.

The position x of a particle with respect to time t along x- axis is given by x = 9t2 -t3 where x is in meter and t in second. What will be the position of this particle when it achieves maximum speed along the +x direction? 

  • 32 m

  • 54 m

  • 81 m 

  • 81 m 

1607 Views

Advertisement