UNIT IV: Work, Energy and Power - Online Test
Q1. A wind-powered generator converts wind energy into electric energy. Assume that the generator converts a fixed fraction of the wind energy intercepted by its blades into electrical energy. For wind speed v, the electrical power output will be proportional to
Answer : Option C
Explaination / Solution:
No Explaination.
Q2. Two equal masses m1 and m2
are moving along the same straight line with velocities 5ms-1 and -9ms-1
respectively. If the collision is elastic, then calculate the velocities after
the collision of m1 and m2, respectively
Answer : Option C
Explaination / Solution:
No Explaination.
Q3. A particle is placed at the origin and a force F=kx
is acting on it (where k is a positive
constant). If U(0)=0, the graph of U(x) versus x will be (where U is the
potential energy function)
Answer : Option C
Explaination / Solution:
No Explaination.
Q4.
A particle which is constrained to move
along x-axis, is subjected to a force in the same direction which varies with
the distance x of the particle from the origin as F(x) =-kx+ax3.
Answer : Option D
Explaination / Solution:
No Explaination.
Q5. A spring of force constant k is cut into two pieces such that one piece is double the length of the other. Then, the long piece will have a force constant of
Answer : Option B
Explaination / Solution:
No Explaination.
