CBSE Questions for Class 11 Engineering Physics Laws Of Motion Quiz 2 - MCQExams.com

A body of mass M collides with a wall with velocity V and rebounds with the same speed. Its change in momentum is equal to :
  • Zero
  • MV
  • 2MV
  • 3MV
Momentum is defined as :
  • weight
  • mass
  • mass$$\times$$velocity
  • velocity
Galilee's law of inertia is another name for newton's (... ) law of motion.
  • First
  • Second
  • Third
  • Anyone of the above
A ball of mass $$\dfrac{1}{10}$$ kg is thrown against a wall. It strikes the wall normally with a velocity of $$\displaystyle 30{ ms }^{ -1 }$$ and rebounds from there with a velocity $$\displaystyle 20{ ms }^{ -1 }$$. The impulse of the force exerted by the ball on the wall is 
  • 0.5Ns
  • 50Ns
  • 5 Ns
  • 1Ns
A cannon after firing recoils due to 
  • Conservation of energy
  • Backward thrust of gases produced
  • Newton's first law of motion
  • Newton's third law of motion
$$Force\times time =$$________. Fill in the blank.
  • Acceleration
  • Impulse
  • Velocity
  • Momentum
kg ms$$^{-1}$$ is the SI unit of
  • impulse
  • force
  • angular velocity
  • none of these
Impulse is
  • a scalar quantity
  • a vector quantity
  • neither a scalar nor a vector
  • sometimes a scalar and sometimes a vector
Column AColumn B
a) Forcei) $$f\times t$$
b) Momentumii) $$m\times a$$
c) Impulseiii) $$m\times v$$
  • $$a - iii, b - ii, c - i$$
  • $$a - ii, b - iii, c - i$$
  • $$a - i, b - ii, c - iii$$
  • $$a - iii, b - i, c - ii$$
Choose the wrong statement:
  • 1 kg wt = 9.8 N
  • Momentum is a vector quantity.
  • Force is always conserved.
  • Momentum is conserved in the absence of an external force.
Two similar trucks are moving with the same velocity on the road. One is loaded and the other is empty. Which truck will require more force to be stopped?
  • Loaded truck
  • Empty truck
  • Both equal
  • Can't be predicted
A body can change its state of rest or of uniform motion on its own. True or false.
  • True
  • False
A number of discs, each of momentum $$M  kg  {m}/{s}$$ are striking a wall at the rate of $$n$$ discs per minute. The force associated with these discs, in newtons, would be
  • $$\displaystyle\frac{Mn}{60}$$
  • $$60 Mn$$
  • $$\displaystyle\frac{M}{60n}$$
  • $$\displaystyle\frac{n}{60M}$$
"Every action has its equal and opposite reaction" is Newton's:
  • First law of motion
  • Second law of motion
  • Third law of motion
  • Fourth law of motion
A long-jumper runs before jumping because
  • He covers a greater distance
  • He maintains momentum conservation
  • He gains energy by running
  • He gains momentum
The force acting on an object are balanced, then the object:
  • must be at rest
  • must be moving
  • must not be accelerating
  • must lose energy
An astronaut in space throws an object away from his space shuttle. Which of the following statements is true?
  • The initial velocity of the astronaut is equal and opposite to the velocity of the tool.
  • The impulse applied to the astronaut is equal and opposite to the impulse applied to the tool.
  • The mass of the astronaut is equal to the mass of the tool.
  • The momentum of the astronaut is greater than the momentum of the tool.
  • The force applied to the tool is greater than the force applied to the astronaut.
A simple pendulum, composed of a bob of mass $$m$$ connected to the end of a massless rod, executes simple harmonic motion as it swings through small angles of oscillation.The maximum angular displacement with the vertical is denoted by $${ \theta  }_{ max }$$. Frictional effects and variation of acceleration due to gravity are negligible.  
Find out the correct statement?
480285.jpg
  • At $$\theta=0$$, the tangential acceleration is $$0$$
  • At $$\theta={\theta}_{max}$$, the tangential acceleration is $$0$$
  • At $$\theta=0$$, the speed is $$0$$
  • At $$\theta=0$$, the restoring force is maximized
  • At $$\theta={\theta}_{max}$$, the speed is maximized
A physics student is performing a experiment in which she twirls  rubber stopper at the end of a string around in a circle at nearly constant speed and tries to determine its acceleration. Which of the following single changes would enables her to most nearly double the acceleration of the rubber stopper?
  • Double the speed of the rubber stopper.
  • Use a string that is twice as long as the original string.
  • Reduce the speed of the rubber stopper to half its original value.
  • Use a string that is half as long as the original string
  • Use a rubber stopper with twice as much mass as the original rubber stopper.
A ride in an amusement park called scream machine swings the riders around a complete vertical circle during the course of the ride.
Identify where on ride rider feels the maximum speed?

480094_fcf3fe22ce1246bfb552fb674d215e0f.png
  • Point A
  • Point B
  • Point C
  • Point D
  • Point E
A ball of mass $$m$$ is attached with the string of length $$R$$, rotating in a circular motion, with instantaneous velocity $$v$$ and centripetal acceleration $$a$$.
Calculate the centripetal acceleration of the ball if its mass is doubled?
  • $${a}/{4}$$
  • $${a}/{2}$$
  • $$a$$
  • $$2a$$
  • $$4a$$
Which of the following quantities has equivalent units as Impulse?
  • Displacement
  • Velocity
  • Acceleration
  • Linear momentum
  • Kinetic energy
A man in a minivan rounds a circular turn at a constant speed. Which of the following would cause the minivan to experience less acceleration ?
  • traveling faster
  • traveling around a turn with a smaller circular radius
  • traveling with more weight in the van
  • traveling around a turn with a greater circular radius
  • traveling the opposite direction around the same turn
A simple pendulum, composed of a bob of mass $$m$$ connected to the end of a massless rod, executes simple harmonic motion as it swings through small angles of oscillation.The maximum angular displacement with the vertical is denoted by $${ \theta  }_{ max }$$. Frictional effects and variation of acceleration due to gravity are negligible.  
Which one of the following would enable you to calculate the length of the pendulum?
480287.jpg
  • The mass of the bob
  • The period of the oscillations
  • The tangential acceleration at $$\theta = 0$$
  • The maximum speed of the bob
  • The acceleration at $$\theta = {\theta}_{max}$$
The amateur boxers, use larger and more padded gloves than professional boxers. The amateur boxers are more protected from injury because:
  • The larger glove exerts a larger impulse on the boxer
  • The larger glove exerts a larger force on the boxer
  • The larger glove exerts more energy on the boxer
  • The larger glove increases time of impact on the boxer
  • The larger glove increases the power exerted on the boxer
A force acts on a body of mass 3 kg such that its velocity changes from 4 m $$s^{-1}$$ to 10 m $$s^{-1}$$.Calculate the change in the momentum of the body.
  • 2 kg m $$s^{-1}$$
  • 14 kg m $$s^{-1}$$
  • 18 kg m $$s^{-1}$$
  • 42 kg m $$s^{-1}$$
Which of the following balls is easier to catch even though all of them are moving with the same velocity?
  • Tennis ball
  • Cricket ball
  • Basket ball
  • Both cricket and basket ball
Which of the following statements is NOT true?
  • When the mass of a body is doubled, the momentum of a body is halved, provided the velocity remains the same.
  • The pain we feel in the hand on hitting the wall is a consequence of Newton's third law of motion.
  • A table-cloth which is pulled from a table without dislodging the dishes is due to inertia of rest.
  • Momentum is a vector quantity.
Maximum safe speed does not depend upon
  • radius of curvature
  • angle of inclination with the horizontal
  • mass of the vehicle
  • acceleration due to gravity
Which of the following physical quantities has the same units as that of impulse?
  • Momentum
  • Force
  • Torque
  • Couple
State whether true or false.
An increase in the base area leads to the decrease in stability of the object.
  • True
  • False
What does the principle of conservation of linear momentum state?
  • The linear momentum of a system cannot be changed.
  • The linear momentum of a system cannot remain constant.
  • The linear momentum of a system can be changed only if internal forces act.
  • The linear momentum of a system can be changed only if external forces acts on it.
 Free body diagrams doesn't play any role in making the calculations on the conditions of the equilibrium of the body.
  • True
  • False
The maximum safe speed for a vehicle taking a turn on a curved banked road, does not depend upon
  • acceleration due to gravity
  • mass of the vehicle
  • angle of inclination with the horizontal
  • radius of curvature of the track
Which of the following is not force?
  • Impulse
  • Tension
  • Thrust
  • Weight
Banking of roads is provided at turns to :
  • reduce intertia
  • increase centripetal force
  • increase fiction
  • none of these
What is the other name of Galileo's law of falling bodies?
  • Law of motion
  • Newton's first law
  • Newton's second law
  • Newton's third law
The banking angle is independent of
  • the velocity of the vehicle
  • mass of the vehicle
  • the radius of curvature of the road
  • the height of inclination
A large force is acting on a body for a short time. The impulse imparted is equal to the change in :
  • Acceleration
  • Momentum
  • Energy
  • Velocity
Force is directly proportional to
  • Rate of change in distance
  • Rate of change in velocity
  • Momentum
  • Rate of change in momentum
A cyclist is moving on a circular track of radius $$80\ m$$ with a velocity of $$72\ km/hr$$. He has to lean from he vertical approximately through an angle-
  • $$\tan ^{ -1 }{ \left( 1/4 \right) } $$
  • $$\tan ^{ -1 }{ \left( 1 \right) } $$
  • $$\tan ^{ -1 }{ \left( 1/2 \right) } $$
  • $$\tan ^{ -1 }{ \left( 2 \right) } $$
A turn of radius 100 m is being designed for a speed of 25 m/s. At what angle should the turn be banked?
  • 32 degrees
  • 60 degrees
  • 45 degrees
  • 10 degrees

The symbol and formula for momentum is
  • $$m, pv$$
  • $$p, ma$$
  • $$p, mv$$
  • $$M, mv$$
What is the difference of force of friction acting on a body moving on a fixed surface?
  • Along the different of motion
  • Opposite to the direction of motion
  • Independent of Motion
  • Both (A) and (B)
A brick of mass $$m$$ , tied to a rope , is being whirled in a vertical circle, with a uniform speed. The tension in the rope is:
  • The same throughout
  • Largest when the brick is at the highest point of the circular path and smallest when it is at the lowest point
  • Largest when the rope is horizontal and smaller when it is vertical.
  • Largest when the brick is at the lowest point of the circular path and smallest when it is at the highest point
When the constant force is 10 N for time period 1 s to 10 second then, find the impulse?
  • 45 Ns
  • 50 Ns
  • 90 Ns
  • 100 Ns
A force of $$10 \,N$$ acts on a body of mass $$0.5 \,kg$$ for $$0.25 \,sec$$ starting from rest. What is its momentum now?
  • $$2.5 \,N/sec$$
  • $$0.25 \,N/sec$$
  • $$0.5 \,N/sec$$
  • $$0.75 \,N/sec$$
Force acting on a body is given by $$F=(1200-4\times 10^{5}t)\ N$$. After starting the motion to it moves with constant velocity, how much impulse of force is acting on it?
  • Zero
  • $$0.9\ Ns$$
  • $$1.8\ Ns$$
  • $$3.6\ Ns$$
The linear momentum of a body of mass m moving with velocity is :
  • $$v/m$$
  • $$m/v$$
  • $$mv$$
  • $$1/mv$$
What is the unit of momentum?
  • $$kg$$ $$m/s$$
  • $$kg$$ $$ms$$
  • $$kg$$ $$m/s^{2}$$
  • $$m/s$$
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