Acceleration due to Gravity MCQ

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• Tom and Jerry are running forward at the same speed. They are following a rubber ball at a constant speed v as seen by the thrower. According to Sam, who’s standing on the ground, the speed of the ball is ____________
  ক

  Same as v

  খ

  Greater than v

  গ

  Less than v

  ঘ

  Zero
• When a ball is thrown vertically upwards, at the maximum height ____________
  ক

  The velocity is zero and therefore there is no acceleration acting in the particle

  খ

  The acceleration is present and therefore the velocity is not zero

  গ

  Acceleration depends on the velocity

  ঘ

  Acceleration is independent of the velocity
• The displacement of the body is given to be proportional to the cube of time elapsed. The magnitude of acceleration of body is ____________
  ক

  Increasing with time

  খ

  Decreasing with time

  গ

  Constant but not zero

  ঘ

  Zero
• From a building 2 balls A and B are thrown such that A is thrown upward and B is thrown downward. If vA and vB are their respective velocities on reaching the ground, then _____________
  ক

  vB is greater than vA

  খ

  vB = vA

  গ

  vB is lesser than vA

  ঘ

  Their velocities depend on their masses.
• A bullet fired into a fixed target loss half of its velocity after penetrating 3cm. How much further will it penetrate before coming to rest assuming that it faces constant resistance in motion?
  ক

  1.5cm

  খ

  1cm

  গ

  3cm

  ঘ

  2cm
• For a particle in one dimensional motion, which of the following is true?
  ক

  Zero speed at any instant may have zero acceleration at the instant

  খ

  Zero speed may have non-zero velocity

  গ

  Constant speed must have zero acceleration

  ঘ

  Positive value of acceleration must be speeding up
• A particle in one dimensional motion with zero speed may have non-zero velocity.
  ক

  True

  খ

  False
• A player throws a ball upwards with an initial speed of 29.4m/s. What is the direction of acceleration during the upwards motion of the ball?
  ক

  Upwards

  খ

  Diagonal

  গ

  Projectile motion

  ঘ

  Vertically downwards
• Two trains A and B of length 400m each are moving on two parallel tracks with a uniform speed of 72km/h in the same direction, with A ahead of B. The driver of B decides to overtake A and accelerates by 1m/s. If after 50s, the guard of B just brushes past the driver of A, what is the original distance between them?
  ক

  50m

  খ

  150m

  গ

  125m

  ঘ

  1250m
• When rain falls vertically downwards, the front screen of a moving car gets wet while the back screen remains dry.
  ক

  True

  খ

  False
• Two balls of different masses (one lighter and one heavier) are thrown vertically upward with same initial speed. Which one will rise to a greater height?
  ক

  The lighter one

  খ

  The heavier one

  গ

  Neither

  ঘ

  Both the balls
• How is the speed related to the magnitude of velocity?
  ক

  Greater

  খ

  Lesser

  গ

  Equal

  ঘ

  Doesn’t vary
• Under what condition is the average velocity equal to the instantaneous velocity?
  ক

  Varying velocity

  খ

  Varying speed

  গ

  Constant velocity

  ঘ

  Constant speed
• Displacement can be greater than the distance travelled by an object.
  ক

  True

  খ

  False
• Can earth be regarded as a point object when describing its yearly journey around the sun?
  ক

  Yes

  খ

  No