Important Questions of Motion in A Plane Physics | Zigya

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171.

Assertion: In javelin throw, the athlete throws the projectile at an angle slightly more than 45o.

Reason: The maximum range does not depend upon the angle of projection.

  • If both assertion and reason are true and reason is the correct explanation of assertion. 

  • If both assertion and reason are true and reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false


172.

A body is projected horizontally with a velocity 42  m/sec. The velocity of the body after 0.7 seconds will be nearly ( Take g = 10 m/sec2 )

  • 10 m/sec

  • 9 m/sec

  • 19 m/sec

  • 11 m/sec


173.

Assertion:  Generally  the  path  of  a  projectile from  the  earth  is  parabolic  but  it  is elliptical  for  projectiles  going  to  a very  great  height.

Reason:  Up to ordinary height the  projectile  moves under  a  uniform  gravitational  force, but  for  great  heights,  projectile  moves  under a  variable force.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


174.

Assertion: When the velocity of projection of a body is made  n times, its time of flight becomes n  times.

Reason: Range of projectile does not depend on
the initial velocity of a body.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false


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175.

Which of the following velocity-time graphs shows a realistic situation for a body in motion?


176.

A lead shot of  1 mm diameter falls through a long column of glycerine. The variation of its velocity  'v'  with distance covered is represented by


177.

If vectors  P = ai^ + aj^ + 3k^  and  Q = ai^ - 2j^ - k^ are perpendicular to each other, then the positive value of  a  is

  • 3

  • 1

  • 2

  • 0


178.

At the uppermost point of a projectile, its velocity and acceleration are at an angle of

  • 0°

  • 90°

  • 45°

  • 180°


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179.

Certain neutron stars are believed to be rotating at about 1 rev/s. If such a star has a radius of 20 km, the acceleration of an object on the equator of the star will be

  • 20 ×108 m/s2

  • ×105 m/s2

  • 120× 105 m/s2

  • × 108 m/s2


180.

In a carnival ride, the passengers travel in a circle of radius 5.0 m, making one complete circle in 4.0 s. What is the acceleration?

  • 24.6 m/s2

  • 12.3 m/s2

  • 6.15 m/s2

  • 49.2 m/s2


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