McqMate
Chapters
| 1. |
Tensile strain is equal to |
| A. | Force per unit area |
| B. | Force per unit volume |
| C. | Extension per unit length |
| D. | Force per unit length |
| Answer» C. Extension per unit length | |
| 2. |
In elastic collisions, |
| A. | only the total momentum of the colliding objects is conserved. |
| B. | only the total kinetic energy is conserved. |
| C. | both of the momentum and total kinetic energy are conserved. |
| D. | neither momentum of the colliding bodies nor the total kinetic energy are |
| Answer» C. both of the momentum and total kinetic energy are conserved. | |
| 3. |
Total angular momentum of a body is given by |
| A. | I × ω; where I: moment of inertia of the body, ω: angular velocity |
| B. | I² × ω; where I: moment of inertia of the body, ω: angular velocity |
| C. | I² × ω²; where I: moment of inertia of the body, ω: angular velocity |
| D. | I × ω²; where I: moment of inertia of the body, ω: angular velocity |
| Answer» A. I × ω; where I: moment of inertia of the body, ω: angular velocity | |
| 4. |
Force that acts on a mass of 1 g and gives it an acceleration of 1 cm s -2 is defined as {{}} |
| A. | 1 newton |
| B. | 1 dyne |
| C. | 1 pound-force |
| D. | 1 pa-force |
| Answer» B. 1 dyne | |
| 5. |
An object moving in a circle of radius ‘r’ with a constant speed ‘v’ has a constant acceleration towards the center equal to |
| A. | v²⁄r |
| B. | v⁄r |
| C. | v²×r |
| D. | v×r |
| Answer» A. v²⁄r | |
| 6. |
Einstein's mass-energy relationship states that if the mass decreases by Δm, the energy released ΔE is given by {{}} |
| A. | ΔE = Δm × c, where "c" denotes the speed of light. |
| B. | ΔE = Δm × c², where "c" denotes the speed of light. |
| C. | ΔE = Δm ⁄ c, where "c" denotes the speed of light. |
| D. | ΔE = Δm ⁄ c², where "c" denotes the speed of light. |
| Answer» B. ΔE = Δm × c², where "c" denotes the speed of light. | |
| 7. |
Bernoulli's principle states that, for streamline motion of an incompressible non-viscous fluid: |
| A. | the pressure at any part + the kinetic energy per unit volume = constant |
| B. | the kinetic energy per unit volume + the potential energy per unit volume = constant |
| C. | the pressure at any part + the potential energy per unit volume = constant |
| D. | the pressure at any part + the kinetic energy per unit volume + the potential energy per unit volume = constant |
| Answer» D. the pressure at any part + the kinetic energy per unit volume + the potential energy per unit volume = constant | |
| 8. |
While Young's modulus ‘E’ relates to change in length and bulk modulus ‘K’ relates to change in volume, modulus of rigidity ‘G’ relates to change in: |
| A. | weight |
| B. | density |
| C. | shape |
| D. | temperature |
| Answer» C. shape | |
| 9. |
Young's modulus is defined as |
| A. | tensile strain/tensile stress |
| B. | tensile stress/tensile strain |
| C. | tensile stress × tensile strain |
| D. | length/area |
| Answer» B. tensile stress/tensile strain | |
| 10. |
Velocity of escape is equal to |
| A. | r × √(2g); where r: radius of Earth or any other planet for that matter, g: gravitational field strength |
| B. | g × √(2r); where r: radius of Earth or any other planet for that matter, g: gravitational field strength |
| C. | √(2g) ⁄ r; where r: radius of Earth or any other planet for that matter, g: gravitational field strength |
| D. | √(2gr); where r: radius of Earth or any other planet for that matter, g: gravitational field strength |
| Answer» D. √(2gr); where r: radius of Earth or any other planet for that matter, g: gravitational field strength | |
| 11. |
Speed ‘v’ with which wave travels through a medium is given by |
| A. | modulus of elasticity/density of the medium |
| B. | modulus of elasticity/√(density of the medium |
| C. | √(modulus of elasticity/density of the medium |
| D. | v=d/t |
| Answer» C. √(modulus of elasticity/density of the medium | |
| 12. |
Hooke's law states that |
| A. | the extension is proportional to the load when the elastic limit is not exceeded |
| B. | the extension is inversely proportional to the load when the elastic limit is not exceeded |
| C. | the extension is independent of the load when the elastic limit is not exceeded |
| D. | load is dependent on extension |
| Answer» A. the extension is proportional to the load when the elastic limit is not exceeded | |
| 13. |
Dimensions of strain are {{}} |
| A. | [L] |
| B. | [M] [L]-1[T]-2 |
| C. | [L]-1 |
| D. | It's a dimensionless quantity |
| Answer» D. It's a dimensionless quantity | |
| 14. |
Due to energy dissipation by viscous forces in air, if simple harmonic variations of a pendulum die away after some time, then oscillation is said to be: |
| A. | undamped |
| B. | free |
| C. | damped |
| D. | dependent |
| Answer» C. damped | |
| 15. |
At ‘yield point’ of a copper wire |
| A. | the load hasn't exceeded the elastic limit yet; so, Hooke's law applies |
| B. | the load has already exceeded the elastic limit and the material has become plastic |
| C. | even the plastic stage has passed and the wire has snapped already |
| D. | Like Brass and Bronze, Copper has no yield point |
| Answer» B. the load has already exceeded the elastic limit and the material has become plastic | |
| 16. |
Stationary waves are also called |
| A. | static waves |
| B. | standing waves |
| C. | progressive waves |
| D. | All of the above |
| Answer» B. standing waves | |
| 17. |
When the work done in moving a particle round a closed loop in a field is zero, the forces in the field are called |
| A. | Zero forces |
| B. | Non-Conservative forces |
| C. | Conservative forces |
| D. | Viscous forces |
| Answer» C. Conservative forces | |
| 18. |
Substances that elongate considerably and undergo plastic deformation before they break are known as |
| A. | brittle substances |
| B. | breakable substances |
| C. | ductile substances |
| D. | elastic substances |
| Answer» C. ductile substances | |
| 19. |
1 torr is equal to |
| A. | 1 N⁄m² |
| B. | 1 mm Hg |
| C. | 1 bar |
| D. | All of the above |
| Answer» B. 1 mm Hg | |
| 20. |
Velocity of sound waves through any material depends on |
| A. | the material's density ‘d’ only |
| B. | the material's density ‘d’ as well as its modulus of elasticity ‘E’ |
| C. | the material's modulus of elasticity ‘E’ only |
| D. | neither the material's density ‘d’ nor its modulus of elasticity ‘E’ |
| Answer» B. the material's density ‘d’ as well as its modulus of elasticity ‘E’ | |
| 21. |
Period of simple harmonic motion of a spiral spring or elastic thread is given by |
| A. | T = 2π × (extension produced/gravitational field strength |
| B. | T = 2π × (extension produced/√(gravitational field strength |
| C. | T = 2π × (√(extension produced)/gravitational field strength |
| D. | T = 2π × √(extension produced/gravitational field strength |
| Answer» D. T = 2π × √(extension produced/gravitational field strength | |
| 22. |
In order to slip one surface over another, maximum frictional force has to be overcome, this maximum frictional force between the two surfaces is also known as |
| A. | kinetic frictional force |
| B. | maximal frictional force |
| C. | limiting frictional force |
| D. | resisting force |
| Answer» C. limiting frictional force | |
| 23. |
Van der Waals derived an expression for the ‘pressure defect’, if the observed pressure is denoted as ‘p’ and volume is denoted as ‘V’, the gas pressure in the bulk of the gas is equal to: |
| A. | p + a/V; where a: constant for the particular gas |
| B. | p + a/(V²); where a: constant for the particular gas |
| C. | p + (a × V); where a: constant for the particular gas |
| D. | p + (a × V²); where a: constant for the particular gas |
| Answer» B. p + a/(V²); where a: constant for the particular gas | |
| 24. |
"Upthrust = Weight of the liquid displaced" is known as |
| A. | Bernoulli's Principle |
| B. | Archimedes' Principle |
| C. | Pascal's Law |
| D. | Coulomb's law |
| Answer» B. Archimedes' Principle | |
| 25. |
Assuming uniform density of the core, the acceleration due to gravity below the Earth's surface is |
| A. | inversely proportional to the square of the distance from the center of the Earth |
| B. | inversely proportional to the distance from the center of the Earth |
| C. | directly proportional to the square of the distance from the center of the Earth |
| D. | directly proportional to the distance from the center of the Earth |
| Answer» D. directly proportional to the distance from the center of the Earth | |
| 26. |
When a gas or a liquid is subjected to an increased pressure, the substance contracts, the bulk strain is defined as |
| A. | final volume ⁄ original volume |
| B. | final pressure ⁄ original pressure |
| C. | change in volume ⁄ original volume |
| D. | original volume ⁄ change in volume |
| Answer» C. change in volume ⁄ original volume | |
| 27. |
Tensile stress is equal to |
| A. | Force per unit area |
| B. | Force per unit volume |
| C. | Extension per unit length |
| D. | Extension per unit area |
| Answer» A. Force per unit area | |
| 28. |
Dimensions of relative density are |
| A. | mass × length-3 |
| B. | mass × length3 |
| C. | It has no dimensions, since it's a ratio of two densities |
| D. | length 3 × mass -1 |
| Answer» C. It has no dimensions, since it's a ratio of two densities | |
| 29. |
Dimensions of gravitational constant ‘G’ are: {{}} |
| A. | [M]-1[L]3[T]-2 |
| B. | [M] [L]3[T]-2 |
| C. | [M]-1[L]2[T]-1 |
| D. | [M] [L]-1[T]2 |
| Answer» A. [M]-1[L]3[T]-2 | |
| 30. |
A person of mass ‘m’ kg jumps from a height of ‘h’ meters, he will land on the ground with a velocity equal to: |
| A. | √(2 × g × h |
| B. | 1/h × √(2 × g |
| C. | 2gh |
| D. | 2√(g × h |
| Answer» A. √(2 × g × h | |
| 31. |
In linear motion, the energy is given by 1⁄2mv 2. Similarly, in rotational motion, the rotational energy is given by {{}} |
| A. | 1/2 × I × ω; where I: moment of inertia of the body, ω: angular velocity |
| B. | 1/2 × I² × ω; where I: moment of inertia of the body, ω: angular velocity |
| C. | 1/2 × I × ω²; where I: moment of inertia of the body, ω: angular velocity |
| D. | 1/2 × I² × ω²; where I: moment of inertia of the body, ω: angular velocity |
| Answer» C. 1/2 × I × ω²; where I: moment of inertia of the body, ω: angular velocity | |
| 32. |
Boyle's law states that |
| A. | pressure of a gas is inversely proportional to its volume i.e. P × V = constant |
| B. | pressure of a gas is directly proportional to its volume i.e. P⁄V = constant |
| C. | pressure of a gas is inversely proportional to the square of its volume i.e. P × V² = constant |
| D. | pressure of a gas is directly proportional to the square of its volume i.e. P ⁄ V² = constant |
| Answer» A. pressure of a gas is inversely proportional to its volume i.e. P × V = constant | |
| 33. |
Isothermal bulk modulus is equal to |
| A. | Υ × P; where Υ: the ratio of the specific heat capacities of the gas, P: pressure |
| B. | Pressure |
| C. | The ratio of the specific heat capacities of the gas |
| D. | Υ ⁄ P; where Υ: the ratio of the specific heat capacities of the gas, P: pressure |
| Answer» B. Pressure | |
| 34. |
Adiabatic bulk modulus is equal to: |
| A. | Υ × P; where Υ: the ratio of the specific heat capacities of the gas, P: pressure |
| B. | Pressure |
| C. | The ratio of the specific heat capacities of the gas |
| D. | Υ ⁄ P; where Υ: the ratio of the specific heat capacities of the gas, P: pressure |
| Answer» A. Υ × P; where Υ: the ratio of the specific heat capacities of the gas, P: pressure | |
| 35. |
Bernoulli's principle shows that, at points in a moving fluid where the potential energy change is very small |
| A. | the pressure is low where the velocity is low and similarly, the pressure is high where the velocity is high |
| B. | the pressure is low where the velocity is high and conversely, the pressure is high where the velocity is low |
| C. | pressure becomes independent of the velocity of the moving fluid |
| D. | pressure remain independent of the speed of the stationary fluid |
| Answer» B. the pressure is low where the velocity is high and conversely, the pressure is high where the velocity is low | |
| 36. |
1 N (newton) is equal to {{}} |
| A. | 102 dynes |
| B. | 103 dynes |
| C. | 104 dynes |
| D. | 105 dynes |
| Answer» D. 105 dynes | |
| 37. |
Torricelli's theorem states that the velocity ‘v’ of the liquid emerging from the bottom of the wide tank is given by √(2gh). In practice, this velocity is: |
| A. | equal to √(2gh |
| B. | greater than √(2gh |
| C. | lesser than √(2gh |
| D. | independent of height and gravitational field strength |
| Answer» C. lesser than √(2gh | |
| 38. |
Dimensions of Young's modulus are {{}} |
| A. | [M]-1[L]-1[T]-2 |
| B. | [M]-1[L]-2[T]-2 |
| C. | [M] [L]-2[T]-2 |
| D. | [M] [L]-1[T]-2 |
| Answer» D. [M] [L]-1[T]-2 | |
| 39. |
Kepler's 3rd law states that... |
| A. | the periods of revolution of the planets are proportional to the cube of their mean distances from sun |
| B. | the periods of revolution of the planets are inversely proportional to the cube of their mean distances from sun |
| C. | the squares of the periods of revolution of the planets are proportional to the cube of their mean distance from sun |
| D. | the squares of the periods of revolution of the planets are inversely proportional to the cube of their mean distance from sun |
| Answer» C. the squares of the periods of revolution of the planets are proportional to the cube of their mean distance from sun | |
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