MCQ on Lami’s Theorem: Previous trends reveal that NEET/JEE aspirants find Physics as the most challenging section amongst the other sections. But most of them fail to decipher the reason behind this. This particularly can be as the candidates taking up this examination are predominantly medical aspirants with their subject of interest being Biology. Also, sections like Physics are more on theories, laws, numerical as opposed to Biology which is more of fact-based, life sciences and comprising of substantial explanations.

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In this post we are providing you MCQ on Lami’s Theorem, which will be beneficial for you in upcoming NEET, AIIMS, JEE, WBJEE, Medical and Engineering Exams.

MCQ on Lami’s Theorem

Q1. Which of the following theories states that “if a body is in equilibrium under the action of three coplanar and concurrent forces, each of the forces is proportional to the sine of the angle between the other two.”
a) Parallelogram Law of Forces
b) Lami’s Theorem
c) Triangle Law of Forces
d) Polygon Law of Forces

Q2. What is the minimum number of non-zero vectors in different planes that can be added to give a resultant of zero?
a) Two
b)  Three
c) Four
d) Five

Q3. A 30 kg iron block is suspended using supports A and B as shown in the figure. What is the tension in both ropes?

a) 263.566 N and 215.2 N
b) 463.566 N and 415.2 N
c) 663.566 N and 615.2 N
d) 863.566 N and 815.2 N

Q4. According to Lami’s theorem which of the following statements is true?
a) Three forces acting at a point will be in equilibrium.
b) Three forces acting upon a particle will be in equilibrium if they are represented in magnitude and direction by the sides of a triangle, taken in order.
c) If three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two.
d) Three forces acting at a point can be represented by a triangle, each side being proportional to the force.

Q5. Which of the following is true about Lami’s theorem?
a) The theorem is derived based on the cosine rule of trigonometry
b) The theorem is only applicable to regular shaped bodies in equilibrium
c) The theorem is helpful in determining the unknown forces acting at a point for an object in equilibrium.
d) The theorem determines the forces acting on a moving body.

Q6. Three coplanar forces A, B and C acting at a point in the plane are in equilibrium. If the given value of A is 1.9318 kg wt and sinθ1 is 0.9659, what is the value of C?
a) 1
b) 2
c) 0.9659
d) 1/2

Q7. In the figure given below, the advertisement board having a mass of 6 kg is suspended by two strings which makes an angle of 450 with the signboard. How much is the tension in both the strings?

a) 21.6 N
b) 41.6 N
c) 61.6 N
d) 81.6N

Q8. In the given figure, the tension in the horizontal cord is 30 N. What is the weight W and tension in the string OA in Netwon?

a) 30√3, 30
b) 60√3, 30
c) 30√3, 60
d) 60√3, 60

Q9. If the body is under equilibrium under the influence of a set of non-colinear force, then the minimum number of forces has to be
a) Two
b) Three
c) Four
d) Five

 

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By Team Learning Mantras