Molecular Solids are MCQ. We covered all the Molecular Solids are MCQ in this post for free so that you can practice well for the exam.
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MCQ on Solids for Students
The breaking stress for a wire of unit cross section is called its
(a) yield point
(b) tensile strength
(c) elastic fatigue
(d) young’s modulus
Option b – tensile strength
The longitudinal extension of any elastic material is very small. In order to have an appreciable change, the material must be in the form of
(a) a thin block of any cross-section
(b) a thick block of any cross-section
(c) a long thin wire
(d) a short thin wire
Option c – a long thin wire
Two liquid drops coalesce to form a large drop. Now,
(a) energy is liberated
(b) energy is neither liberated nor absorbed
(c) some mass gets converted into energy
(d) energy is absorbed
Option a – energy is liberated
Hooke’s law states that
(a) stress is directly proportional to the strain
(b) stress is inversely proportional to the strain
(c) stress is proportional to Young’s modulus
(d) stress and strain are independent of each other
Option a – stress is directly proportional to the strain
Hooke’s law essentially defines
(a) stress
(b) strain
(c) yield point
(d) elastic limit
Option d – elastic limit
Young’s modulus is defined as
(a) the ratio of linear strain to normal stress
(b) the ratio of normal stress to strain
(c) the product of linear strain and normal stress
(d) the square of the ratio of normal stress to linear strain
Option b – the ratio of normal stress to strain
Which of the following substance has the highest elasticity?
(a) Steel
(b) Copper
(c) Rubber
(d) Sponge
Option a – Steel
Shearing strain is expressed by
(a) angle of shear
(b) angle of twist
(c) decrease in volume
(d) increase in volume
Option a – angle of shear
According to Hooke’s law of elasticity, if stress is increased, then the ratio of stress to strain
(a) becomes zero
(b) remains constant
(c) decreases
(d) increases
Option b – remains constant
In the case of steel wire (or metal wire), the limit is reached when
(a) the wire just breaks
(b) the load is more than the weight of the wire
(c) elongation is inversely proportional to the tension.
(d) None of these
Option d – None of these
A stretched rubber has
(a) increased kinetic energy
(b) increased potential energy
(c) decreased kinetic energy
(d) decreased potential energy
Option b – increased potential energy
A spiral spring is stretched by a weight attached to it. The strain is
(a) shear
(b) elastic
(c) tensile
(d) bulk
Option a – shear
The only elastic modulus that applies to fluids is
(a) Young’s modulus
(b) shear modulus
(c) modulus of rigidity
(d) bulk modulus
Option d – bulk modulus
Which of the following affects the elasticity of a substance?
(a) Hammering and annealing
(b) Change in temperature
(c) Impurity in substance
(d) All of the above
Option d – All of the above
Young’s modulus of a perfectly rigid body is
(a) unity
(b) zero
(c) infinity
(d) some finite non-zero constant
Option c – infinity
Elastomers are the materials that:
(a) are not elastic at all
(b) have a very small elastic range
(c) do not obey Hooke’s law
(d) None of these
Option c – do not obey Hooke’s law
A substance floats in water but sinks in coconut oil. The density of the substance
(a) is less than the density of the water
(b) is greater than the density of oil
(c) Both (a) and (b)
(d) Cannot be decided from the given information
Option c – Both (a) and (b)
The buoyant force on an object due to a fluid always acts :
(a) in the downward direction
(b) sideways
(c) in the upper direction
(d) None of these
Option c – in the upper direction
A wooden cube floating in water supports a mass m = its stop. When the mass is removed the cube 0.2kg on rises by 2cm. The side of the cube is – (density of water 10³kg/m³)
(a) 6 cm
(b) 12 cm
(c) 8 cm
(d) 10 cm
Option d – 10 cm
Iron nail sinks in water because :
(a) the weight of the nail is less than the buoyant force acting on it due to the water
(b) the weight of the nail is equal to the buoyant force acting on it due to the water
(c) the weight of the nail is greater than the buoyant force acting on it due to the water
(d) the weight of the nail increases in the water
Option c – the weight of the nail is greater than the buoyant force acting on it due to the water
Water rises in a capillary tube to a height of h. It will rise to a height of more than h
(a) on the surface of the sun
(b) in a lift moving down with an acceleration
(c) at the poles
(d) in a lift moving up with an acceleration
Option b – in a lift moving down with an acceleration
An object just floats in water. If common salt is added to the water ( Molecular Solids are MCQ )
(a) the volume of the object immersed in the liquid decreases
(b) the object sinks
(c) the object first sinks and then floats up
(d) cannot be determined
Option a – the volume of the object immersed in the liquid decreases
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