Wednesday, 21 September 2022

MOTION IN A STRAIGHT LINE : MCQ ON MOTION IN A STRAIGHT LINE SET 4

 

     

Q1 The equation of motion for the freely dropped body under gravity is

  • (a)`v^{2}`  = 2ah
  • (b) `v^{2}`  = -2gh
  • (c) `v^{2}`  = -2ah
  • (d) `v^{2}`  = 2gh

  • (d) v^{2}  = 2gh

Q2 The stopping distance 'S' of a vehicle who is moving with initial velocity 'u' 

  • (a) S= `\frac{u^{2}}{2a}`
  • (b) S= `\frac{a^{2}}{2u}`
  • (c) S= `\frac{-u^{2}}{2a}`
  • (d) None of these 

  • S= `\frac{-u^{2}}{2a}`

Q3  The ratio of the distance travel by a body falling freely from rest in first, second and third second of its fall is:-

  • (a)2 : 3 : 5 
  • (b) 1 : 3 : 5
  • (c) 5 : 3 :1 
  • (d) 3 : 5 : 1

  • (b) 1 : 3 : 5 ( u=0, use formula `h_{nth}`= u+`\frac{g}{2}`(2n-1)

Q4 A balloon rising vertically up with a uniform velocity 15m/s releases a ball at a height of 100m. Calculate the time taken by the ball to hit the ground? g=10ms/2

  • (a)7.5s 
  • (b) 5.7s
  • (c) 6.2s 
  • (d) 6.9s

  • (c) 6.2s 

Q5  When a body falls freely under gravity, its velocity increases and g is positive.

  • a) True
  • b) False 

  • a) True

Q6 When a body thrown upward its velocity increases, g is negative.

  • a) True
  • b) False

  • b) False

Q7  For a normal person, the reaction time is

  • a) `\frac{1}{15}s`
  • b) `\frac{1}{50}s`
  • c) `\frac{1}{10}s`
  • d) 0 s


  • a) `\frac{1}{15}s`

Q8 The distance travelled by vehicle after it stops before the applied brakes is called stopping distance.

  • a) True
  • b) False

  • b) False

Q9.  The time interval between seeing a child and pressing the brake is known as

  • a) Reaction time
  • b) stopping time
  • c) parallactic second
  • d) None of these

  • a) Reaction time

Q10 .......acceleration is called deceleration

  • a) +ve acceleration
  • b) -ve acceleration
  • c) zero acceleratio
  • d) All of above

  • b) -ve acceleration

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