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