CBSE Class 11 Mechanical Properties of Solids — practice questions
85 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 11 Mechanical Properties of Solids in the app →Which of the following is the correct definition of **stress** in a deformed body?A material that returns to its original shape once the deforming force is removed is said to beThe SI unit of Young's modulus isOn the stress-strain curve of a ductile material, the **proportional limit** is the point up to whichA steel wire of length $L$ and cross-section $A$ is stretched by a force $F$, producing extension $\Delta L$. Two wires A and B of the same material have lengths in the ratio $1 : 2$ and diameters in the ratio $2 : 1$. TA uniform pressure $P$ is applied isotropically to a solid sphere of bulk modulus $K$. The fractional change iThe Poisson's ratio of a material is defined asThe theoretical range of Poisson's ratio for an isotropic material isThe elastic potential energy stored per unit volume in a stretched wire (within the elastic limit) isA steel rod is clamped rigidly at both ends and then heated through a temperature rise $\Delta T$. If $\alpha$A wire of length $L$, area $A$ and Young's modulus $Y$ is stretched by hanging a mass $m$ from its free end. T\n\nIn the stress-strain curve of a ductile mater\n\nThe area under the stress-strain curve from O\n\nThe diagram above shows a block under a tange\n\nFor the spherical body subjected to uniform e\n\nThe figure compares the stress-strain curves Two blocks of 2 kg and 3 kg connected by a string are pulled by 10 N on the 3 kg block (frictionless). The accPer NCERT §4.5, the dimensions of FORCE are which set?Per NCERT Example 4.7, the MAXIMUM acceleration of a train such that a box on its floor (μ_s = 0.15) remains sPer NCERT Example 4.10, a cyclist taking a R=3 m turn at 18 km/h (μ_s = 0.1) is in which condition?A body that regains its original shape once the deforming force is removed has undergone which kind of deformaThe magnitude of stress is the applied normal force divided by what?What units does strain carry?Tensile stress and compressive stress can together be termed as what?A solid sphere placed in a fluid at high pressure is squeezed equally on all sides. This condition is called wThe ratio of the change in volume to the original volume is known as what?For small deformations, stress and strain stay proportional to each other. This result is known as what?In the relation stress equals k times strain, the constant k is known as what?On a stress strain curve, the yield point is also known by which name?A loaded body that does not regain its original dimension after the load is removed is said to have what?On a stress strain curve for a metal, point D marks which quantity?If the ultimate strength and the fracture points on the curve are far apart, the material is described as whatRubber and the elastic tissue of the aorta stretch to very large strains. Such substances are called what?What is true of the class of solids called elastomers?The shear modulus of a material is also called by which name?The reciprocal of the bulk modulus is given which name?How do bulk moduli compare across solids, liquids and gases?The strain measured perpendicular to the applied force is called what?What units does Poisson ratio carry?For steels, Poisson ratio lies in which range?You stretch a spring gently and let go. It returns to its old length. This property is:You press a lump of putty and it keeps the new shape. Putty is close to an ideal:A steel bar looks perfectly rigid. Can a large enough force still deform it?Hooke found that the elongation of a body is proportional to the:The restoring force per unit area inside a deformed body is called:You stretch a cylinder by pulling both ends. The stress in it is called:You press a thick book down and push its top sideways. The book is under:A solid ball sits deep in a fluid under high pressure. Its volume shrinks but its shape:Strain is a ratio of two lengths, so its unit is:On a metal's stress-strain graph, the straight part from O to A is where:Point B on the curve, the yield point, is also called the:You unload a wire past its yield point and it stays stretched. The wire has a:A material's ultimate strength and fracture points are very close together. It is:Rubber and aorta tissue stretch to very large strains. Such substances are called:Tensile stress divided by longitudinal strain gives:Steel needs 2000 N for a stretch that copper manages with 1100 N. So steel is:Shear modulus G is also called the modulus of:Hydraulic stress divided by volume strain is the:You squeeze a solid block, a liquid drop and an air bubble with the same pressure. The largest bulk modulus beYou stretch a wire and its diameter shrinks slightly. The strain across the wire is called:Lateral strain divided by longitudinal strain is:A crane rope must not stretch beyond its:Robert Hooke found that a spring's elongation is proportional to the load. He presented his law in:In the spring-ball model of a solid, the balls stand for:Stress is restoring force per unit area, while strain is the:The SI unit of stress is newton per square metre, also called the:A stress that changes an object's shape by sliding faces sideways is possible only in:The ratio of change in volume to original volume under fluid pressure is the:Hooke's law is valid for most materials but is described as:Point D on the stress-strain curve, the highest stress a metal can take, is its:Aorta tissue has a huge elastic region but no clear:Elastomers are a class of solids that do not obey:Metals have large Young's moduli, so they need a large force to produce a:Wood, bone, concrete and glass have Young's moduli that are:For a system in equilibrium the bulk modulus is always:Cranes lift heavy loads using a thick:A bridge must withstand traffic load, wind force and its own:To reduce the bending of a beam, it is more effective to increase its:A very deep, thin beam may bend sideways under load. This is called:The I-shaped cross-section of bridge beams cuts weight and cost without losing:Elastic properties of rocks limit the maximum height of a mountain on Earth to about:The shear stress at a mountain's base must stay below the critical stress at which rocks:Steel is more elastic than copper, brass and aluminium, so steel is preferred in:A crane rope is usually a bundle of thin wires braided together, which gives flexibility and: