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CBSE

Subject

Physics

NEET Physics : Work, Energy and Power

Multiple Choice Questions

141.

A body of mass 3 kg acted upon by a constant force is displaced by S' metre, given by relation $S = \frac{1}{3} t^{2}$ , where t is in second. Work done by the force in 2 is

$\frac{8}{3} J$
$\frac{19}{5} J$
$\frac{5}{19} J$
$\frac{3}{8} J$

142.

Force required to move a mass of 1 kg at rest on a horizontal rough plane (µ = 0.1 and g =9.8 ms^-2) is

0.98 N
0.49 N
9.8 N
4.9 N

143.

Two blocks of 2 kg and 1 kg are in contact on a frictionless table. If a force of 3 N is applied on 2 kg block, then the force of contact between the two blocks will be

zero
1 N
2 N
3 N

144.

The work done in carrying a charge Q once around a circle of radius r about a charge q at the centre is

$\frac{qQ}{4 {πε}_{0} r}$
$\frac{qQ}{4 {πε}_{0}} \frac{1}{πr}$
$\frac{qQ}{4 {πε}_{0}} (\frac{1}{2 πr})$
Zero

Short Answer Type

145.

The displacement x of a particle at time t moving under a constant force is t = $\sqrt{x}$ + 3, x in metre, t in second. Find the work done by the interval from t = 0 to t= 6 s.

Multiple Choice Questions

146.

Two particles have masses m and 4m and their kinetic energies are in the ratio 2 : 1. What is the ratio of their linear momenta ?

$\frac{1}{\sqrt{2}}$
$\frac{1}{2}$
$\frac{1}{4}$
$\frac{1}{16}$

147.

If the kinetic energy of a body changes by 20 %, then its momentum would change by

20 %
24 %
9.5 %
44 %

148.

The force F acting on a particle moving in a straight line is shown below. What is the work done by the force on the particle in the 1st metre of the trajectory ?

5 J
10 J
15 J
2.5 J

149.

In elastic collision

both momentum and kinetic energies are conserved
both momentum and kinetic energies are not conserved
only energy is conserved
only mechanical energy is conserved

150.

A body rolls down an inclined plane. If its kinetic energy of rotation is 40% of its kinetic energy of translation, then the body is

solid cylinder
solid sphere
disc
ring

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