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NEET Physics : Work, Energy and Power

Multiple Choice Questions

11.

$A particle moves from postion \vec{r_{1}} = 3 \hat{i} + 2 \hat{j} - 6 \hat{k} to position \vec{r_{2}} = 14 \hat{i} + 13 \hat{j} + 9 \hat{k} under action of force \vec{F} = 4 \hat{i} + \hat{j} + 3 \hat{k} N . The work done will be$

100J
50J
200J
75J

12.

On a frictionless surface, a block of mass M moving at speed v collides elastically with another block of same mass M which is initially at rest. After collision, the first block moves at an angle θ to its initial direction and has a speed v/3/ The second block's speed after the collision is

3/4 v

13.

The diagrams below show regions of equipotentials

A positive charge is moved from A to B in each diagram.

Maximum work is required to move q in figure (c).
In all the four cases the work done is the same.
Minimum work is required to move q in figure (a).
Minimum work is required to move q in figure (a).

14.

The heart of a man pumps 5 L of blood through the arteries per minute at a pressure of 150 mm of mercury . If the density of mercury be 13.6 x 10³ kg/ m³ and g = 10 m/s², then the power of heart in watt is

1.70
2.35
3.0
3.0

15.

If force $\vec{F} = 5 \hat{i} + 3 \hat{j} + 4 \hat{k}$ makes a displacement of $\vec{s} = 6 \hat{i} - 5 \hat{k}$ work done by the force is

10units
$122 \sqrt{5}$ units
$5 \sqrt{122} units$
20units

16.

Water falls from a height of 60 m at the rate of 15 kg /s to operate a turbine. The losses due to frictional

8.1 kW
10.2 kW
12.3 kW
12.3 kW

17.

An engine pumps water through a hosepipe. Water passes through the pipe and leaves it with a velocity of 2 ms^-1. The mass per unit length of water in the pipe is 100 kgm^-1. What is the power of the engine?

400 W
200 W
100 W
100 W

18.

A tube of length L is filled completely with an incompressible liquid of mass M and closed at both the ends. The tube is then rotated in a horizontal plane about one of its ends with a uniform angular velocity ω. The force exerted by the liquid at the other end is

$MLω squared over 2$
$fraction numerator ML squared straight omega over denominator 2 end fraction$
$MLω squared$
$MLω squared$

19.

Consider a drop of rain water having mass 1 g falling from a height of 1 km. It hits the ground with a speed of 50 m/s. Take g constant with a value 10 m/s2. The work done by the (i) gravitational force and the (ii) resistive force of air is

(i) – 10 J (ii) –8.25 J
(i) 1.25 J (ii) –8.25 J
(i) 100 J (ii) 8.75 J
(i) 100 J (ii) 8.75 J

20.

The work done in pulling up a block of wood weighing 2 kN for a length of 10 m on a smooth plane inclined at an angle of 15° with the horizontal is

9.82 kJ
89 kJ
4.35 kJ
5.17 kJ

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NEET Physics : Work, Energy and Power

Multiple Choice Questions