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61.

A cantilever beam rectangular in cross-section is subjected to a load W at its free end, causing deflection ?1. If the load is increased to 2W, causing deflwction ?2, the value of ?1/?1 would be

A.	1	B.	22
D.	4

62.

A cantilever beam rectangular in cross-section is subbjected to a load W at its free end. If the depth of the beam is doubled and the load is halved, the deflection of the free end as compared to original deflection will be

A.	Half	B.	One-sixteenth
C.	One eight	D.	Double
E.	Eight times

63.

A cantilever beam of square section is subjected to a load W at the free end. If the length of the beam is doubled and load reduced to half, the deflection at the free end as compared to original deflection would be

A.	2 times	B.	4 times
C.	8 times	D.	16 times
E.	half

64.

Two beams of equal cross-sectional area are subjected to equal bending moment. If one beam has square cross-section and the other has circular section, then

A.	Both beams will be equally strong	B.	Circular section beam will be economical
C.	Square section beam will be economical	D.	The suitability of section will depend on the nature of loading
E.	In shear, square section beam will be stronger

65.

When a beam having square cross-section is loaded longitudinally, the shear stress develops

A.	One middle fibres in horizontal plane	B.	On top fibre in horizontal plane
C.	On middle fibre in vertical plane	D.	Along the diagonal
E.	Equally on each fibre along horizontal plane

66.

A beam simply supported at the ends carries a load W at the centre, causing deflection ?1. If the width of beam is doubled the deflection at the centre under the same load will be

A.	?1
D.	??1
E.	2?1

67.

A beam simply supported at the ends carried load W at the centre causing deflection y. If the depth of the section of the beam is doubled the deflection at the centre will be

A.	y
D.	1/8 y
E.	2y

68.

The phenomenon under which the strain of a material varies under constant stress is known as

A.	Creep	B.	Strain hardening
C.	Buchinger's effect	D.	Hysteresis
E.	Visco-elasticity

69.

The neutral axis of a simply supported beam is

A.	Where fibres are subjected to maximum bending stress	B.	When fibres are subjected to minimum bending stress
C.	Where fibres are subjected to maximum compression	D.	Where fibres do not undergo strain
E.	Where fibres undergo maximum strain

70.

A feinforced concrete beam is considered as made of

A.	Homogeneous material	B.	Hetrogeneous material
C.	Composite material	D.	Isotropic material
E.	Clad material