# Composite Sections Bars MCQ Questions & Answers

Composite Sections Bars MCQs : This section focuses on the "Composite Sections Bars". These Multiple Choice Questions (MCQs) should be practiced to improve the Composite Sections Bars skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

A composite rod is 1000mm long, its two ends are 40 mm2 and 30mm2 in area and length are 400mm and 600mm respectively. If the rod is subjected to an axial tensile load of 1000N, what will be its total elongation(E = 200GPa)?

A. 0.130m
B. 0.197mm
C. 0.160mm
D. 0.150mm

Question 2

A steel bar of 20mm x 20mm square cross-section is subjected to an axial compressive load of 100kN. If the length of the bar is 1m and E=200GPa, then what will be the elongation of the bar?

A. 1.25mm
B. 2.70mm
C. 5.40mm
D. 4.05mm

Question 3

A round bar made of same material consists of 4 parts each of 100mm length having diameters of 40mm, 50mm, 60mm and 70mm, respectively. If the bar is subjected to an axial load of 10kN, what will be the total elongation of the bar in mm?

A. 0.4/?E ( 1/16 + 1/25 + 1/36 + 1/49)
B. 4/?E ( 1/16 + 1/25 + 1/36 + 1/49)
C. 2/?E ( 1/16 + 1/25 + 1/36 + 1/49)
D. 40/?E ( 1/16 + 1/25 + 1/36 + 1/49)

Question 4

How does the elastic constant varys with the elongation of body?

A. The elastic constant is directly proportional to the elongation
B. The elastic constant is directly proportional to the elongation
C. The elongation does not depends on the elastic constant
D. None of these

Question 5

A member ABCD is subjected to points load P1=45kN, P2, P3=450kN and P4=130kN. What will be the total elongation of the member, assuming the modulus of elasticity to be 2.1x105N/mm2. The cross sectional area is 625mm, 2500mm, 1250mm respectively.

A. 0.4914mm
B. 0.4235mm
C. 0.4621mm
D. 0.4354mm

Question 6

A rod of two sections of area 625mm2 and 2500mm2 of length 120cm and 60cm respectively. If the load applied is 45kN then what will be the elongation (E = 2.1x 105 N/mm2)?

A. 0.462mm
B. 0.521mm
C. 0.365mm
D. 0.514mm

Question 7

A bar is in two sections having equal lengths. The area of cross section of 1st is double that of 2nd. if the bar carries an axial load of P, then what will be the ratio of elongation in section 2nd to section 1st ?

A. 01-Feb
B. 2
C. 4
D. 01-Apr

Question 8

A mild steel wire 5mm in diameter and 1m ling. If the wire is subjected to an axial tensile load 10kN what will be its extension?

A. 2.55mm
B. 3.15mm
C. 2.45mm
D. 2.65mm

Question 9

A rod, which tapers uniformly from 5cm diameter to 3cm diameter in a length of 50cm, is subjected to an axial load of 6000N. if E = 2,00,000 N/mm2, what will be the extension of the rod?

A. 0.00114cm
B. 0.00124cm
C. 0.00127cm
D. 0.00154cm

Question 10

If a bar of sections of two different length and different diameters are in a line and P load is acting axially on them then what will be the change in length of the bar?

A. P/E x (L1 + L2)
B. P/E x (A1/L1 + A2/ L2)
C. P/E x (L1/A1 + L2/A2)
D. E/P x (L1/A1 + L2/A2)

Question 11

A round bar made of same material consists of 4 parts each of 100mm length having diameters of 40mm, 50mm, 60mm and 70mm, respectively. If the bar is subjected to an axial load of 10kN, what will be the total elongation of the bar in mm?

A. 0.4/πE ( 1/16 + 1/25 + 1/36 + 1/49)
B. 4/πE ( 1/16 + 1/25 + 1/36 + 1/49)
C. 2/πE ( 1/16 + 1/25 + 1/36 + 1/49)
D. 40/πE ( 1/16 + 1/25 + 1/36 + 1/49)

Question 12

A bar is in two sections having equal lengths. The area of cross section of 1st is double that of 2nd. if the bar carries an axial load of P, then what will be the ratio of elongation in section 2nd to section 1st ?

A. 02-Jan
B. 2
C. 4
D. 04-Jan

Question 13

A solid uniform metal bar is hanging vertically from its upper end. Its elongation will be _________

A. Proportional to L and inversely proportional to D2
B. Proportional to L2 and inversely proportional to D
C. Proportional of U but independent of D
D. Proportional of L but independent of D

Question 14

A composite rod is 1000mm long, its two ends are 40mm2 and 30mm2 in area and length are 300mm and 200mm respectively. The middle portion of the rod is 20mm2 in area. If the rod is subjected to an axial tensile load of 1000N, what will be its total elongation (E = 200GPa)?

A. 0.145mm
B. 0.127mm
C. 0.187mm
D. 0.196mm

Question 15

A composite bar consists of a bar enclosed inside a tune of another material when compressed under a load as whole through rigid collars at the end of the bar. What will be the equation of compatibility?

A. W1 + W2 = W
B. W1 + W2 = constant
C. W1/A1E1 = W2/A2E2
D. W1/A1E2 = W2/A2E1