CBSE Questions for Class 11 Medical Physics Work, Energy And Power Quiz 6 - MCQExams.com

Electric heater converts:
  • Electric energy into chemical energy
  • chemical energy into electric energy
  • heat energy into electric energy
  • electric energy into heat energy
From the following statements find the one that is NOT correct :
  • A flying bird has both potential and kinetic energy
  • A ball rolling on the ground has kinetic energy but no mechanical energy
  • A stretched rubber band has potential energy.
  • Chemical energy can be converted into electrical energy
A boy of mass $$40\ kg$$ runs up a flight of $$50$$ steps, each $$10\ cm$$ high in $$14\ s$$. So, work done by the boy is:
  • $$1960\ J$$
  • $$19.6\ J$$
  • $$980\ J$$
  • $$9.8\ J$$
A stone of mass 8 kg has been lifted to a height of 2 m from the ground. Calculate the rise in its potential energy.
  • 156.8 J
  • 165.8 J
  • 16 J
  • 160 J
Kinetic energy of a body depends on its:
  • Position
  • Velocity
  • Shape
  • Colour
A fruit hanging from the top branch of a tree possesses
  • gravitational potential energy
  • elastic potential energy
  • kinetic energy
  • sound energy
Muscular energy is form of chemical energy. 
  • True
  • False
A tube light converts electrical energy into :
  • Chemical energy
  • Magnetic energy
  • Light energy
  • Mechanical energy
A crane pulls up a car of mass $$500kg$$ to a vertical height of $$4m$$. So, work done by the crane is:
  • $$19.6J$$
  • $$19.6kJ$$
  • $$19600kJ$$
  • $$4900J$$
Which one of the following energies cannot be possessed by a body at rest?
  • Potential energy
  • Kinetic energy
  • Thermal energy
  • Magnetic energy
Which one of the following is NOT a form of energy?
  • Mechanical energy
  • Nuclear Energy
  • Thermal Energy
  • Leap Energy
A magnet can attract iron filings as it possesses:
  • kinetic energy
  • magnetic energy
  • mechanical energy
  • solar energy
In which form, the energy is stored in a fuel?
  • Potential energy
  • Thermal energy
  • Kinetic energy
  • Chemical energy
When two dry bodies are rubbed together, they get charged due to movement of free electrons from one body to the other body, so they possess:
  • nuclear energy
  • electrical energy
  • hydro energy
  • light energy
The energy possessed by fast moving water is called:
  • solar energy
  • elastic energy
  • hydro energy
  • geothermal energy
An object of mass $$40\ kg$$ is raised to a height of $$5\ m$$ above ground. If the object is allowed to fall down find its kinetic energy when it is half-way down.
  • 1960 J
  • 980 J
  • 990 J
  • 1000 J
800 g ball is pulled up a slope as shown in the figure. Calculate the potential energy it gains.
516715_95831e6b2bed4fb8a11e5a2c9edd4816.png
  • 1.96 J
  • 1.57 J
  • 7.84 J
  • 1.26 J
A green cart is less massive than a red cart. Both carts are on a frictionless horizontal track where they can only travel along the same straight line. The green cart bumps into the stationary red cart.
As a result of the collision, the red cart moves forward in the direction of the green cart's original velocity. The green cart bounces off the red cart and moves backward.
How does the magnitude of the red cart's momentum after the collision compare with the magnitude of the green cart's momentum before the collision?
  • The magnitude of the red cart's momentum after the collision the greater than the magnitude of the green cart's momentum before the collision
  • The magnitude of the red cart's momentum after the collision the less than the magnitude of the green cart's momentum before the collision
  • The magnitude of the red cart's momentum after the collision the same as the magnitude of the green cart's momentum before the collision
  • Nothing can be determined about the magnitude of the red cart's momentum after the collision unless the mass of the red cart is known
  • Nothing can be determined about the magnitude of the red cart's momentum after the collision unless we know that the collision is perfectly elastic
A sphere 'P' of mass 'm' moving with velocity 'u' collides head-on with another sphere 'Q' of mass 'm' which is at rest. The ratio of final velocity of 'Q' to initial velocity of 'P' is ______. (e= coefficient of restitution)
  • $$\displaystyle\frac{e-1}{2}$$
  • $$\left[\displaystyle\frac{e+1}{2}\right]^{1{/2}}$$
  • $$\displaystyle\frac{e+1}{2}$$
  • $$\left[\displaystyle\frac{e+1}{2}\right]^2$$
All types of energy that exist in the nature can be categorized as either kinetic or potential. Choose correct statement regarding the validity of above sentence.
  • This statement is true for thermal and and mechanical, but not elastic
  • This statement is true for all different types of energy
  • This statement is false, except in the case of mechanical energy
  • This statement is never true
A particle experiences a constant $$( +4N, -4N )$$ force as it is displaced from $$\left(0, 0\right)m$$ to $$\left(2, 0\right)m$$.
How much work was done on the particle?
  • $$0 J$$
  • $$8 J$$
  • $$16 J$$
  • $$32 J$$
  • None of the above
A car standing at the top of a hill would be an example of what type of energy?
  • Kinetic
  • Topical
  • Potential
  • Beneficial
  • Residual
A constant horizontal $$4.0 N$$ force acts on a $$300 g$$ cart on a horizontal track as the cart moves through a distance of $$43.0 cm$$. The cart decelerates as a result.
What was the work performed on the cart by the force?
  • $$-1.72 J$$
  • $$-1.27 J$$
  • $$1.27 J$$
  • $$1.72 J$$
  • None of the above
The position function of a particle is given by $$x\left(t\right)=k{t}^{{5}/{2}}$$, where $$k$$ is a constant.
If the particle starts at rest and is propelled through some distance $$d$$ so that the trajectory matches $$x\left(t\right)$$, the work done on the particle is proportional to which power of $$t$$?
  • $${t}^{5}$$
  • $${t}^{3}$$
  • $${t}^{{5}/{2}}$$
  • $${t}^{{3}/{2}}$$
  • Not enough information
An object of mass $$1 kg$$ is raised through a height '$$h$$'. Its potential energy is increased by $$1 J$$. Find the height.
  • $$0.102 m$$
  • $$0.105 m$$
  • $$0.130 m$$
  • $$0.110 m$$
A ball of mass $$1 kg$$ thrown upwards reaches a maximum height of $$5 m$$. Calculate the work done by the force of gravity during this vertical displacement.
  • $$-30 J$$
  • $$-48 J$$
  • $$-49 J$$
  • $$-59 J$$
A fish swimming in water possess mechanical energy.
  • True
  • False
The correct formula to find the velocity of a body with kinetic energy '$$k$$' is:
  • $$V=\dfrac{2k}{m}$$
  • $$V=\sqrt{\dfrac{2k}{m}}$$
  • $$V=\dfrac{4{k}^{2}}{m}$$
  • $$V=\dfrac{1}{2}km$$
A man is climbing a staircase. The energy he uses depends on:
  • The height of the staircase.
  • The weight of his body.
  • The time taken to roach the top.
  • The mass of his body.
What energy does the person possess while climbing a hill?
  • Potential Energy
  • Kinetic Energy
  • Only muscular energy
  • Both (A) and (B)
Under the action of a force $$F=Cx$$, the position of a body changes from $$0$$ to $$x$$. The work done is :
  • $$\cfrac { 1 }{ 2 } C{ x }^{ 2 }$$
  • $$C{ x }^{ 2 }$$
  • $$Cx$$
  • $$\cfrac { 1 }{ 2 } C{ x }$$
A $$2kg$$ object is moving at $$3m/s$$. A $$4N$$ force is applied in the direction of motion and then removed after the object has travelled an additional $$5m$$. The work done by this force is:
  • $$10 J$$
  • $$15 J$$
  • $$20 J$$
  • $$25 J$$
A truck accelerates from speed $$v$$ to $$2v$$. Work done is during this is
  • Three times as the work done in accelerating it from rest to $$v$$
  • Same as the work done in accelerating it from rest to $$v$$
  • Four times as the work done in accelerating it from rest to $$v$$
  • Less than the work done in accelerating it from rest to $$v$$
Calculate the work done in moving a cart from $$x=a$$ to $$x=b$$ whose mass is $$3kg$$ and the given surface is frictionless. $$(Take\ g=9.8m/s^{2})$$
  • $$0$$
  • $$3g(a-b)$$
  • $$3g$$
  • $$3g(a+b)$$
A engine pumps up 100 kg of water trough a height of 10 m in 5s. Given that efficiency of engine is 60%. If $$g=10 ms^{-2}$$, the power of this engine is
  • 3.3 kW
  • 0.22 kW
  • 0.033 kW
  • 33 kW
Kinetic energy of a body depends upon its:
  • mass
  • velocity
  • density 
  • both A and B
A $$30 g$$ bullet initially traveling at $$120 m/s$$ penetrates $$12 cm$$ into wooden block. The average resistance exerted by the wooden block is
  • $$1800 N$$
  • $$2000 J$$
  • $$2200 N$$
  • $$1250 N$$
A body of mass $$1 kg$$ is thrown upwards with a velocity $$20 m/s$$. It momentarily comes to rest after attending a height of $$18m$$ . How much energy is lot due to air friction (in J)
  • $$10$$
  • $$20$$
  • $$30$$
  • $$40$$
While climbing the mountain, more amount of energy is required. Identify the correct reason.
  • Because the amount of oxygen at height decreases
  • Because at height pressure increase
  • Human body is adaptable for normal pressure and oxygen
  • All of these
The potential energy of a point particle is given by the expression $$V\left( x \right) =-\alpha x+\beta \sin { \left( { x }/{ \gamma  } \right)  }$$. A dimensionless combination of the constants $$ \alpha ,\beta$$ and $$ \gamma $$ is
  • $${ \alpha }/{ \beta \gamma }$$
  • $${ { \alpha }^{ 2 } }/{ \beta \gamma }$$
  • $${ \gamma }/{ \alpha \beta }$$
  • $${ \alpha \gamma }/{ \beta }$$
The co-efficient of restitution e for a perfectly elastic collision is
  • $$1$$
  • $$0$$
  • $$-1$$
  • infinity
A force of $$10 N$$ is applied on a object of mass $$1 kg$$ for $$2 s$$, which was initially at rest. What is the work done on the object by the force?
  • $$200 J$$
  • $$20 J$$
  • $$16 J$$
  • $$180 J$$
A force $$F_{x}$$ acts on a particle such that its position $$x$$ changes as shown in figure.
The work done by the particle as it moves from $$x = 0$$ to $$20\ m$$ is
671463_c83bf09a81ba4b8092025f9c24d1f836.png
  • $$37.5\ J$$
  • $$10\ J$$
  • $$15\ J$$
  • $$22.5\ J$$
  • $$45\ J$$
The potential energy of 1 kg particle free to move along the X-axis is given by $$U=\left (\dfrac{x^4}{4}-\dfrac{x^2}{2}  \right )J$$
The total mechanical energy of the particle is 2 J. Then Maximum speed of the particle is :
  • $$\dfrac{3}{\sqrt{2}}$$
  • $$\dfrac{1}{\sqrt{2}}$$
  • $$\sqrt{2}$$
  • $$2$$
A spring of constant $$5 \times 10^3 N/m$$ is stretched initially by 5 cm from the unstretched position. Then the work required to stretch it further by another 5 cm is:
  • $$6.25 Nm$$
  • $$12.5 Nm$$
  • $$18.75 Nm$$
  • $$25.00 Nm$$
A particle moves along X-axis from $$x = 10$$ to $$x = 5\ cm$$ under the influence of force given by $$F = (7 - 2x + 3x^{2}) N$$. The work done in the process is
  • $$70\ J$$
  • $$270\ J$$
  • $$35\ J$$
  • $$135\ J$$
Two persons are holding a rope of negligible weight tightly at the ends so that it is horizontal. A $$15$$kg weight is attached to the rope at the midpoint which now no longer remains horizontal. The minimum tension required to completely straighten the rope is?
  • $$15$$kg
  • $$15/2$$kg
  • $$5$$kg
  • Infinitely large
The mass of bucket full of water is 15 kg . It is being pulled up from a 15 m deep well. Due to a hole in the bucket 6 kg water flows out of the bucket at a uniform rate. The work done in drawing the bucket out of the well will be $$(g=10 m/s^2)-$$
  • 900 J
  • 1500 J
  • 1800 J
  • 2100 J
A body of mass m is moving in a circle of radius r with a constant speed $$v$$. If a force $$\dfrac{mv^2}{r}$$ is acting on the body towards the centre, then what will be the work done by this force in moving the body over half the circumference of the circle?
  • Zero
  • $$\dfrac{mv^2}{r^2}$$
  • $$\dfrac{mv^2}{r^2}\times \pi r$$
  • $$\dfrac{\pi r^2}{mv^2}$$
If the force constant of a wire is $$K$$, the work done in increasing the length of the wire by/ is
  • $$Kl/ 2$$
  • $$Kl$$
  • $$KI^{2}/2$$
  • $$Kl^{2}$$
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