# Strength of Materials Mcqs

This set of Civil Engineering Multiple Choice Questions & Answers (MCQs) focuses on “ Strength of Materials ”. These Mcqs are chosen from a collection of most authoritative and best reference books on Civil Engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Strength of Materials comprehensively.

## 2. The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is as per the principle of__________________?

Forces

Independence of forces

Dependence of forces

Balance of force

Resolution of forces

## Answer & Solution

**E . Resolution of forces**

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## 3. Which is the correct statement about law of polygon of forces ?

If any number of forces acting at a point can be represented by the sides

A polygon taken in order, then the forces are in equilibrium

If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium

If a polygon representing forces acting at a point is closed then forces are in equilibrium

## Answer & Solution

**D . If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium**

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## 4. The resolved part of the resultant of two forces inclined at an angle 9 in a given direction is equal to__________________?

The algebraic sum of the resolved parts of the forces in the given direction

The sum of the resolved parts of the forces in the given direction

The difference of the forces multiplied by the cosine of 9

The sum of the forces multiplied by the sine of 9

## Answer & Solution

**A . The algebraic sum of the resolved parts of the forces in the given direction**

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## 5. Which of the following is not the unit of distance ?

Angstrom

Light year

Micron

Millimeter

Milestone

## Answer & Solution

**E . Milestone**

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## 6. Which of the following is not the unit of work, energy and heat ?

Kcal

Kg m

KWhr

Hp

## 7. The weight of a body is due to____________________?

Centripetal force of earth

Gravitational pull exerted by the earth

Forces experienced by body in atmos-phere

Force of attraction experienced by par-ticles

Gravitational force of attraction towards the centre of the earth

## Answer & Solution

**E . Gravitational force of attraction towards the centre of the earth**

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## 8. When trying to turn a key into a lock, following is applied___________________?

Coplanar force

Non-coplanar forces

Lever

Moment

Couple

## 9. According to principle of transmissibility of forces, the effect of a force upon a body is_______________?

Maximum when it acts at the center of gravity of a body

Different at different points in its line of action

The same at every point in its line of action

Minimum when it acts at the C.G. of the body

## Answer & Solution

**C . The same at every point in its line of action**

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## 10. A number of forces acting at a point will be in equilibrium if_________________?

Their total sum is zero

Two resolved parts in two directions at right angles are equal

Sum of resolved parts in any two per-pendicular directions are both zero

All of them are inclined equally

## Answer & Solution

**C . Sum of resolved parts in any two per-pendicular directions are both zero**

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## 11. Which of the following is not a vector quantity_______________?

Weight

Velocity

Acceleration

Force

## 12. D’ Alembert’s principle is used for___________________?

Reducing the problem of kinetics to equivalent statics problem

Determining stresses in the truss

Stability of floating bodies

Designing safe structures

## Answer & Solution

**A . Reducing the problem of kinetics to equivalent statics problem**

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## 13. According to Lami’s theorem________________?

Three forces acting at a point will be in equilibrium

Three forces acting at a point can be represented by a triangle, each side being proportional to force

If three forces acting upon a particle are represented in magnitude and

Ection by the sides of a triangle, taken in order, they will be in equilibrium

## Answer & Solution

**D . If three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two**

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where n = number of joints in a frame

## 14. A framed structure is perfect if it contains members equal to________________? where n = number of joints in a frame

where n = number of joints in a frame

2n-3

N-l

2n-l

N – 2

3n-2

## 15. In detennining stresses in frames by methods of sections, the frame is divided into two parts by an imaginary section drawn in such a way as not to cut more than___________________?

Two members with unknown forces of the frame

Three members with unknown forces of the frame

Four members with unknown forces of the frame

Three members with known forces of the frame

## Answer & Solution

**B . Three members with unknown forces of the frame**

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