class 11 physics chapter 6 work energy and power solved questions and answers
Questions
Free download in PDF Class 11 Physics Chapter 6 Work, Energy and Power Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 11 Physics with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries. These will help the students for preparation of their examination./p>
1
What is the ratio of velocities of a nucleus that splits into two parts with radii 1:2
6
Calculate the final kinetic energy of a block of mass if the mass of the block is 10kg and has a constant velocity of 10m/s. The block of mass is subjected to a retarding force of F=0.1J/m
7
Calculate the energy loss in a perfectly inelastic collision if the mass of the object is 40kg with velocity 4m/s hits the object of mass 60kg with velocity 2m/s.
9
A bullet of mass m fired at 30o to the horizontal leaves the barrel of the gun with a velocity v. The bullet hits a soft target at a height h above the ground while it is moving downward and emerges out with half the kinetic energy it had before hitting the target. Which of the following statements are correct in respect of bullet after it emerges out of the target?
A
the velocity of the bullet will be reduced to half its initial value
B
the velocity of the bullet will be more than half of its earlier velocity
C
the bullet will move in a different parabolic path
D
the internal energy of the particles of the target will increase
11
A cricket ball of mass 150 g moving with a speed of 126 km/h hits at the middle of the bat, held firmly at its position by the batsman. The ball moves straight back to the bowler after hitting the bat. Assuming that collision between ball and bat is completely elastic and the two remain in contact for 0.001 sec, the force that the batsman had to apply to hold the bat firmly at its place would be
12
In a shotput event an athlete throws the shotput of mass 10 kg with an initial speed of 1 m/s at 45° from height 1.5 m above ground. Assuming air resistance to be negligible and acceleration due to gravity to be 10 m/s2, the kinetic energy of the shotput when it just reaches the ground will be
14
A body of mass 0.5 kg travels in a straight line with velocity v = ax3/2 where a = 5 m-1/2s-1. The work done by the net force during its displacement from x = 0 to x = 2 m is
17
A bicyclist comes to a skidding stop in 10 m. During this process, the force on the bicyclist due to the road is 200 N and is directly opposed to the motion. The work done by the cycle on the road is
Answer:at first greater than mg, and later becomes equal to mg
19
A proton is kept at rest. A positively charged particle is released from rest at a distance d in its field. Consider two experiments; one in which the charged particles is also a proton and in another, a positron. In the same time t, the work done on the two moving charged particles is
A
the same as the same force law is involved in the two experiments
B
less for the case of a positron, as the positron moves away more rapidly and the force on it weakens
C
more for the case of a positron, as the positron moves away from a larger distance
D
same as the work done by charged particle on the stationary proton
Answer:more for the case of a positron, as the positron moves away from a larger distance
20
An electron and a proton are moving under the influence of mutual forces. In calculating the change in the kinetic energy of the system during motion, one ignores the magnetic force of one on another. This is because,
A
the two magnetic forces are equal and opposite, so they produce no net effect
B
the magnetic forces do no work on each particle
C
the magnetic forces do equal and opposite work on each particle
