Free MCQs & Online Quiz Practice for Exams

Q: A unit for viscosity the centipoise is equal to which of the following

A) 10⁻³N s/m²

B) 10⁻² Ns/m³

C) 10² Ns/m³

D) 10⁻¹ Ns/m¹

Q: Stokes law is applicable only if a body is moving through a liquid with slow speed and has what shape

A) A cubical

B) A spherical

C) A rough

D) Any

Q: The net force that acts on a 10-N falling object when it encounters 4N of air resistance is

A) 0 N

B) 4 N

C) 6 N

D) 10 N

Q: A skydiver jumps from a high-flying helicopter Before reaching terminal velocity her acceleration

A) Increase

B) Decrease

C) Remain the same

D) Is zero

Q: At terminal velocity the acceleration of a falling object is

A) 0 ms⁻²

B) 1 ms⁻²

C) 9.8 ms⁻²

D) +9.8 ms⁻²

Q: According to equation of continuity Av = constant This constant is equal to

A) Volume of fluid

B) Mass of fluid

C) Density of fluid

D) Volume flow rate

Q: At the constriction in the cross-section for ideal flow from equation of continuity it follows that the speed of fluid is

A) Greater

B) Less

C) Same

D) Zero

Q: As water in a level pipe passes from a narrow cross section of pipe to a wider cross section the pressure against the wall

A) Increases

B) Decreases

C) Remains the same

D) Is zero

Q: A 4 m high tank filled with water is drilled with four identical small holes at 1 m 1.5 m 2 m and 2.5 m from the bottom of tank the speed of efflux will be greatest from the hole at

A) 1 m

B) 1.5 m

C) 2 m

D) 2.5 m

Q: Venturi metre is a device used to measure the

A) Mass of fluid

B) Viscosity of fluid

C) Speed of fluid

D) Density of fluid

Q: A certain pipe has a cross-sectional area of 0.0001 m² in which water is flowing at 10 m/s The volume flow rate is

A) 0.00001 m³/s

B) 0.001 m³/s

C) 1 m³/s

D) 10.0001 m³/s

Q: At sufficiently high speeds the flow of viscous fluid becomes

A) Unexpected

B) Stream line

C) Non-viscous

D) Turbulent

Q: The water in the tank is 10 m above the leak point The speed with which the water emerge from the leak is

A) 10 m/s

B) 14 m/s

C) 194 m/s

D) 0.1 m/s

Q: When the radius of the artery is reduced the blood pressure

A) Increased

B) Decreased

C) Remains the same

D) Is zero

Q: Tuning of a radio set is an example of

A) Mechanical resonance

B) Musical resonance

C) Free vibrations

D) Electrical resonance

Q: The heating and cooking of food evenly by microwave oven is an example of

A) S.H.M

B) Resonance

C) Damped Oscillation

D) Free oscillation

Q: In an isolated system the total energy of vibrating mass and spring is

A) Variable

B) Low

C) High

D) Constant

Q: While deriving the equation of time period for simple pendulum which quantity should be kept small

A) Length of simple pendulum

B) Amplitude

C) Mass of simple pendulum

D) Gravitational acceleration

Q: If the period of oscillation of mass M suspended from a spring is 2s then the period of mass 4M will be

A) 1 s

B) 2 s

C) 3 s

D) 4 s

Q: The time period of a simple pendulum is 2 seconds If its length is increased by 4 times then its period becomes

A) 16 s

B) 12 s

C) 8 s

D) 4 s