Wednesday, 21 September 2022

MOTION IN A PLANE : MCQ ON MOTION IN A PLANE SET 2

 

       

Q1 Five equal forces of 100N are applied at a point and lying in one plane. If the angle between them is equal, then the resultant force is?

  • (a) 10N 
  • (b) 20N
  • (c) `2\sqrt{10}`
  • (d) 0 N 

  • (d) 0 N 

Q2  Which one is true about null vector

  • (a) It has zero magnitude 
  • (b) It has no specific direction
  • (c) Both a and b
  •  d) None of the above

  • (c) Both a and b

Q3  Minimum number of unequal vectors which can give zero resultant is

  • ( a) 2 
  • (b) 4
  • (c) 3 
  • (d) None of the above

  • (c) 3 

Q4 The vectors A and B are such that their sum is equal to their difference. The angle between these two vectors will be 

  • a) `90^{0}`
  • b) `0^{0}`
  • c) `40^{0}`
  • d) `180^{0}`

  • a) `90^{0}`

Q5  Dot product of a null vector with any vector is always zero.

  • a) True
  • b) False 

  • a) True

Q6 Lami’s Theorem is based on the cosine rule of trigonometry.

  • a) True
  • b) False

  • b) False

Q7  A moves at a speed of 65 km/hr while B who is behind A moves at the speed of 80 km/hr. what is the relative velocity of B w.r.t. A..

  • a) 60 km/hr
  • b) 80 km/hr
  • c) 145 km/hr
  • d) 15 km/hr


  • d) 15 km/hr Using Formula for relative velocity = VB-VA, 80 – 65 = 15 km/hr

Q8 The rain falling vertically downward with the velocity of 3km/hr. A person moves on a straight road with the velocity of 4 km/hr then the relative velocity of rain w.r.t. person is

  • a) 1 km/hr
  • b) 5 km/hr
  • c) 4 km/hr
  • d) 3km/hr

  • b) 5 km/hr 

Q9.  A bus is moving towards east and car is moving toward north with same speed of 50 km/hr. What is the direction of motion of car to the passenger in the bus?

  • a) `30^{0}`
  • b) `0^{0}`
  • c) `60^{0}`
  • d) `45^{0}`

  • d) `45^{0}`

Q10 A man can protect himself from rain by holding his umbrella at an angle θ =

  • a) `30^{0}`
  • b) `0^{0}`
  • c) `60^{0}`
  • d) None of the above

  • d) None of the above

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