Work and Energy — Physics MCQs (Class 11)
Free chapter-wise Physics MCQs with answers for MDCAT, FSc and entry tests.
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#145 A constant force $F=5\,\text{N}$ acts through $s=4\,\text{m}$ at $\theta=60^\circ$. The work done is:
A) $F/s$
B) $Fs$
C) $F+s$
D) $5s\,\cos60^\circ$
#146 At the bottom of a frictionless track, potential energy is minimum and kinetic energy is:
A) maximum
B) zero
C) undefined
D) minimum
#147 The work–energy theorem for a particle of mass $m$ is:
A) $W_{\text{net}}=\Delta K$
B) $W_{\text{net}}=m\Delta v$
C) $W_{\text{net}}=\Delta p$
D) $W_{\text{net}}=\Delta U$
#148 Dimensions of power are:
A) $M^{0}L^{0}T^{-1}$
B) $ML^{2}T^{-2}$
C) $ML^{2}T^{-3}$
D) $MLT^{-2}$
#149 A constant force $F=10\,\text{N}$ acts through $s=4\,\text{m}$ at $\theta=0^\circ$. The work done is:
A) $Fs$
B) $F+s$
C) $40$
D) $F/s$
#150 At the bottom of a frictionless track, potential energy is minimum and kinetic energy is:
A) minimum
B) undefined
C) maximum
D) zero
#151 If both mass and velocity are doubled then K.E would be
A) Quadrupled
B) Doubled
C) Eight times
D) Sixteen times
#152 A child on a swing 1m above the ground at the lowest point and 6m above the ground at the highest point. The horizontal speed of the child at the lowest point of the swing is approximately.
A) 8 m/s
B) 10 m/s
C) 12 m/s
D) 14 m/s
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