[{"id":155294,"question":"Drag force increases if speed of the object moving through the fluid:","choices":[{"text":"Increases","value":"A"},{"text":"Decreases","value":"B"},{"text":"Remains constant","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":155293,"question":"Fog droplets are suspended in air when their weight is balanced by:","choices":[{"text":"Force of gravity","value":"A"},{"text":"Upward trust due to air","value":"B"},{"text":"Surface tension","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":155292,"question":"At high speed, fluid friction _____ and fuel consumption ___,:","choices":[{"text":"Increases, decreases","value":"A"},{"text":"Increases, increases","value":"B"},{"text":"Decreases, increases","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":155291,"question":"Two copper balls of 1 cm and 2 cm in diameter are simultaneously dropped in the same viscous medium. The terminal velocity of bigger ball is:","choices":[{"text":"Not affected due to its size","value":"A"},{"text":"Twice that of small size ball","value":"B"},{"text":"Four times that of small size ball","value":"C"},{"text":"1/4th of that of small size ball","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":155290,"question":"When the droplet moves with terminal velocity in a fluid, the net force acting on the droplet is:","choices":[{"text":"F<sub>D</sub>-mg","value":"A"},{"text":"Zero","value":"B"},{"text":"mg-F<sub>D</sub>","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":155289,"question":"The _____ viscous the medium is _____, is the value of terminal velocity of the droplet:","choices":[{"text":"More, lesser","value":"A"},{"text":"Lesser, more","value":"B"},{"text":"Both A and B","value":"C"},{"text":"Lesser, lesser","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":155288,"question":"Terminal velocity is the maximum velocity attained by a spherical droplet when the drag force______the weight of droplet:","choices":[{"text":"Is smaller than","value":"A"},{"text":"Is greater than","value":"B"},{"text":"Becomes equal to","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":155287,"question":"A massive object falls through a fluid:","choices":[{"text":"Faster","value":"A"},{"text":"Slower","value":"B"},{"text":"Slowest","value":"C"},{"text":"None","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":155286,"question":"High speed meteors rushing through air reduces to ashes because of:","choices":[{"text":"Force of gravity","value":"A"},{"text":"High resistance of air","value":"B"},{"text":"Drag force","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":155285,"question":"Stock's law holds for:","choices":[{"text":"Motion through free space","value":"A"},{"text":"Motion through viscous medium","value":"B"},{"text":"Bodies of all shapes","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":155284,"question":"Viscosity of water is ______ that of air but ___ that of plasma.","choices":[{"text":"More, more","value":"A"},{"text":"Less, more","value":"B"},{"text":"Less, less","value":"C"},{"text":"More, less","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":155283,"question":"Fluid friction is _____ the friction between two solid surfaces:","choices":[{"text":"Greater than","value":"A"},{"text":"Smaller than","value":"B"},{"text":"Equal to","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":155282,"question":"Density of fluid is defined as:","choices":[{"text":"Its volume to mass ratio","value":"A"},{"text":"Product of volume and mass","value":"B"},{"text":"Its mass of volume ratio","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":155281,"question":"Unit of viscosity is:","choices":[{"text":"Kg m<sup>-1</sup>sec<sup>-1</sup>","value":"A"},{"text":"N s m<sup>-2</sup>","value":"B"},{"text":"J s m<sup>-3</sup>","value":"C"},{"text":"All of these","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":155280,"question":"Glycerin has viscosity _____ the viscosity of water:","choices":[{"text":"More than","value":"A"},{"text":"Equal to","value":"B"},{"text":"Less than","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":155279,"question":"A body is moving through a viscous medium eventually comes to rest because of:","choices":[{"text":"Force of gravity","value":"A"},{"text":"Force of friction","value":"B"},{"text":"Its weight","value":"C"},{"text":"Both A and C","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":155278,"question":"N s m<sup>-2</sup>is unit of:","choices":[{"text":"Drag force","value":"A"},{"text":"Pressure","value":"B"},{"text":"Surface tension","value":"C"},{"text":"Coefficient of viscosity","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":155277,"question":"Machine parts are jammed due to:","choices":[{"text":"Increasing in viscosity of lubricant","value":"A"},{"text":"Decreasing in viscosity of lubricant","value":"B"},{"text":"Decreasing in surface tension of lubricant","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":155276,"question":"The body passing a viscous medium affected by:","choices":[{"text":"One force only","value":"A"},{"text":"Two forces only","value":"B"},{"text":"Four forces","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":155275,"question":"The resistance offered by a fluid to a solid moving inside it is called:","choices":[{"text":"Drag force","value":"A"},{"text":"Surface force","value":"B"},{"text":"Viscosity","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":155274,"question":"The property of fluids due to which they resist their own flow is called:","choices":[{"text":"Drag force","value":"A"},{"text":"Surface tension","value":"B"},{"text":"Viscosity","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":155273,"question":"In case of planets, the necessary acceleration is provided by:","choices":[{"text":"Gravitational force","value":"A"},{"text":"Coulomb force","value":"B"},{"text":"Frictional force","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":155272,"question":"A body can have constant velocity when it follows:","choices":[{"text":"A circular path","value":"A"},{"text":"A rectilinear path","value":"B"},{"text":"Trajectory of a projectile","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":155271,"question":"The instantaneous acceleration of a body moving with constant speed in a circle:","choices":[{"text":"Remains constant","value":"A"},{"text":"Is called centripetal acceleration","value":"B"},{"text":"Tangential acceleration","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":155270,"question":"When a body moves with a constant speed in a circle:","choices":[{"text":"No work is done on it","value":"A"},{"text":"No acceleration is produced in the body","value":"B"},{"text":"Velocity remains constant","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":155268,"question":"When an object moves with a uniform angular velocity, then its instantaneous angular velocity is equal to:","choices":[{"text":"Zero","value":"A"},{"text":"Its average velocity","value":"B"},{"text":"Its angular displacement","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":155267,"question":"The angular speed of a particle moving along a circular path is 5 Pie rad sec<sup>-1</sup>, Its period of motion is:","choices":[{"text":"2.5 sec","value":"A"},{"text":"0.06 sec","value":"B"},{"text":"15.7 sec","value":"C"},{"text":"0.4 sec","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":155266,"question":"Angular velocity is a:","choices":[{"text":"Scalar quantity","value":"A"},{"text":"Vector quantity","value":"B"},{"text":"Complex quantity","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":155265,"question":"Circular motion is an example of motion in:","choices":[{"text":"One dimension","value":"A"},{"text":"Two dimensions","value":"B"},{"text":"Three dimensions","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":155264,"question":"The useful unit of the angular displacement in SI unit is:","choices":[{"text":"Degree","value":"A"},{"text":"Revolution","value":"B"},{"text":"Radian","value":"C"},{"text":"Metre","value":"D"},{"value":"E"}],"correctAnswer":3}]