question_answer 1)
The working principle of a washing machine is: [IAS Prelim]
A)
centrifugation done
clear
B)
dialysis done
clear
C)
reverse osmosis done
clear
D)
diffusion done
clear
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question_answer 2)
Newton's laws of motion do not hold good for objects
A)
at rest done
clear
B)
moving slowly done
clear
C)
moving with high velocity done
clear
D)
moving with velocity comparable to velocity of light done
clear
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question_answer 3)
A jet engine works on the principle of conservation of [NDA]
A)
linear momentum done
clear
B)
angular momentum done
clear
C)
energy done
clear
D)
mass done
clear
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question_answer 4)
Which one among the following is correct for resultant of balanced forces? [NDA]
A)
It is zero done
clear
B)
It is non-zero done
clear
C)
It varies continuously done
clear
D)
None of the above done
clear
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question_answer 5)
When a moving bus suddenly applies brakes, the passengers sitting in it fall in the forward direction. This can be explained by [NDA]
A)
the theory of relativity done
clear
B)
Newton?s first law done
clear
C)
Newton?s second law done
clear
D)
Newton?s third law done
clear
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question_answer 6)
A book is kept on the surface of a table. If the gravitational pull of the earth on the book is the force of action, then the force of reaction is exerted by [NDA]
A)
the book on the table done
clear
B)
the book on the earth done
clear
C)
the table on the book done
clear
D)
the table on the earth done
clear
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question_answer 7)
The pressure exerted on the ground by a man is greatest [CDS]
A)
when the lies down in the ground done
clear
B)
when the stands on the toes of one foot done
clear
C)
when the stands with both foot flat on the ground done
clear
D)
all of the above yield the same pressure done
clear
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question_answer 8)
If a ship moves from freshwater into seawater, it will [CDS]
A)
sink completely done
clear
B)
sink a little bit done
clear
C)
rise a little higher done
clear
D)
remain unaffected done
clear
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question_answer 9)
A man is at rest in the middle of a horizontal plane of perfectly smooth surface of ice. He can move himself to the shore by making use of Newton's [NDA]
A)
first law of motion done
clear
B)
second law of motion done
clear
C)
third law of motion done
clear
D)
first, second and third laws of motion done
clear
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question_answer 10)
If an object having mass of 1 kg is subjected to a force of 1 N it moves with [CDS]
A)
a speed of 1 m/s done
clear
B)
a speed of 1 km/s done
clear
C)
an acceleration of \[10\,m/{{s}^{2}}\] done
clear
D)
an acceleration of \[1\,m/{{s}^{2}}\] done
clear
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question_answer 11)
An athlete diving off a high springboard can perform a variety of exercises in the air before entering the water below. Which one of the following parameters will remain constant during the fall? [CDS]
A)
The athlete's linear momentum done
clear
B)
The athlete's moment of inertia done
clear
C)
The athlete's kinetic energy done
clear
D)
The athlete's angular momentum done
clear
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question_answer 12)
Statement A: While drawing a line on a paper, friction force acts on paper in the same direction along which line is drawn on the paper. Statement B: Friction always opposes motion.
A)
Statement A is correct. done
clear
B)
Statement B is correct. done
clear
C)
Both statements are correct. done
clear
D)
Both statements are incorrect. done
clear
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question_answer 13)
Assertion [A]: A man standing on a completely frictionless surface can propel himself by whistling. Reason [R]: If no external force acts on a system, its momentum cannot change. [IAS Prelim]
A)
Both A and R are true and R is the correct explanation of A done
clear
B)
Both A and R are true but R is not a correct explanation of A done
clear
C)
A is true but R is false done
clear
D)
A is false but R is true done
clear
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question_answer 14)
A spherical body moves with a uniform angular velocity (w) around a circular path of radius r. Which one of the following statements is correct? [IAS Prelim]
A)
The body has no acceleration done
clear
B)
The body has a radial acceleration \[{{\omega }^{2}}r\] directed toward centre of path done
clear
C)
The body has a radial acceleration \[2/5{{\omega }^{2}}r\] directed away from the centre of the path done
clear
D)
The body has an acceleration \[{{\omega }^{2}}\] tangential to its path done
clear
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question_answer 15)
On the basis of following features identify the correct option.
A. It is measured in units of kg m/s. B. Its direction is same as that of velocity of body.
A)
Momentum done
clear
B)
Inertia done
clear
C)
Both A and B done
clear
D)
Neither A and B done
clear
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question_answer 16)
Ball bearings are used in bicycles, cars, etc., because [IAS Prelim]
A)
the actual area of contact between the wheel and axle is increased done
clear
B)
the effective area of contact between the wheel and axle is increased done
clear
C)
the effective area of contact between the wheel and axle is reduced done
clear
D)
None of the above statements is correct done
clear
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question_answer 17)
In cricket match, while catching a fast moving ball, a fielder in the ground gradually pulls his hands backwards with the moving ball to reduce the velocity to zero. The act represents [CDS]
A)
Newton's first law of motion done
clear
B)
Newton's second law of motion done
clear
C)
Newton's third law of motion done
clear
D)
Law of conservation of energy done
clear
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question_answer 18)
Statement A: Pulling a lawn roller is easier than pushing it. Statement B: Pushing increases the apparent weight and hence the force of friction. [CDS]
A)
Statement A is correct. done
clear
B)
Statement B is correct. done
clear
C)
Both statements are correct. done
clear
D)
Both statements are incorrect. done
clear
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question_answer 19)
It is difficult to cut things with a blunt knife because [CDS]
A)
the pressure exerted by knife for a given force increases with increase in bluntness done
clear
B)
a sharp edge decreases the pressure exerted by knife for a given force done
clear
C)
a blunt knife decreases the pressure for a given force done
clear
D)
a blunt knife decreases the area of intersection done
clear
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question_answer 20)
Statement A: When a gun is fired it recoils, i.e., it pushes back, with much less velocity than the velocity of the bullet. Statement B: Velocity of the recoiling gun is less because the gun is much heavier than the bullet. [CDS]
A)
Statement A is correct. done
clear
B)
Statement B is correct. done
clear
C)
Both statements are correct. done
clear
D)
Both statements are incorrect. done
clear
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question_answer 21)
Two teams are pulling a rope with equal and opposite forces each of 5 kN in a tug of war so that a condition of equilibrium exists. What will be the tensile force in the rope? [NDA]
A)
Zero done
clear
B)
2.5 kN done
clear
C)
5 kN done
clear
D)
10 kN done
clear
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question_answer 22)
Column-I
A.
Rocket propulsion
P.
Force
B.
Agent which causes Acceleration
Q.
Momentum
C.
Product of mass and Velocity
R.
S.I. unit of force
D.
Newton
S.
Law of Conservation momentum
A)
A\[\to \]S; B\[\to \]P; C\[\to \]R; D\[\to \]Q done
clear
B)
A\[\to \]P; B\[\to \]S; C\[\to \]R; D\[\to \]Q done
clear
C)
A\[\to \]S; B\[\to \]P; C\[\to \]Q; D\[\to \]R done
clear
D)
A\[\to \]P; B\[\to \]S; C\[\to \]Q; D\[\to \]R done
clear
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question_answer 23)
Statement A: While walking on ice, one should take small steps to avoid slipping. Statement B: This is because smaller steps ensure smaller friction.
A)
Statement A is correct. done
clear
B)
Statement B is correct. done
clear
C)
Both statements are correct. done
clear
D)
Both statements are incorrect. done
clear
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question_answer 24)
Thomas and Mary are playing carom board. They arrange the seeds in the vertical order. Thomas strikes on the seeds with the striker, with a great speed. He finds that, the stakes do not fall down. On the other hand, when he strikes the seeds with less speed, all the seeds of the stakes fell down. Which property of force this shows?
A)
Newton's third law done
clear
B)
Motion done
clear
C)
Inertia done
clear
D)
Reaction of force done
clear
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question_answer 25)
A man getting down a running bus, falls forward because.
A)
due to inertia of rest, road is left behind and man reaches forward done
clear
B)
due to inertia of motion upper part of body continues to be in motion in forward direction while feet come to rest as soon as they touch the road done
clear
C)
he leans forward as a matter of habit done
clear
D)
of the combined effect of all the three factors stated in [a], [b] and [c] done
clear
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question_answer 26)
The work done becomes zero if
A)
force perpendicular to the displacement done
clear
B)
displacement is zero done
clear
C)
force acting on the body is zero done
clear
D)
All of the above done
clear
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question_answer 27)
When an incandescent electric bulb glows [CDS]
A)
the electric energy is completely converted into light done
clear
B)
the electric energy is partly converted into light energy and partly into heat energy done
clear
C)
the light energy is converted into electric energy done
clear
D)
the electric energy is converted into magnetic energy done
clear
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question_answer 28)
The sum of the change in kinetic and potential energy is always [SSC CGL]
A)
Zero done
clear
B)
Positive done
clear
C)
Negative done
clear
D)
None of the above done
clear
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question_answer 29)
The potential energy is always the same for an object with the same
A)
Velocity done
clear
B)
Speed done
clear
C)
Acceleration done
clear
D)
Position done
clear
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question_answer 30)
If velocity of a body is twice of previous velocity, then kinetic energy will become [NDA]
A)
2 times done
clear
B)
1/2 times done
clear
C)
4 times done
clear
D)
1 times done
clear
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question_answer 31)
In case of negative work the angle between the force and displacement is
A)
\[0{}^\circ \] done
clear
B)
\[45{}^\circ \] done
clear
C)
\[90{}^\circ \] done
clear
D)
\[180{}^\circ \] done
clear
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question_answer 32)
How much time will it take to perform 440 J of work at a rate of 11 W?
A)
50 s done
clear
B)
40 s done
clear
C)
30 s done
clear
D)
20 s done
clear
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question_answer 33)
When a stone tied to a string is whirled in a circle, the work done on it by the string is
A)
positive done
clear
B)
negative done
clear
C)
zero done
clear
D)
undefined done
clear
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question_answer 34)
Match the Column I and Column II.
Column-I
A.
Electric motor
P.
Electrical energy to sound energy
B.
Electric bell
Q.
Electrical energy to mechanical energy
C.
Electric bulb electrical
R.
Light energy to Energy
D.
Photoelectric mechanical
S.
Heat energy to cell energy
E.
Steam engine light Energy
T.
Electric energy to
A)
A-P; B-Q; C-T; D-R; E-S done
clear
B)
A-Q; B-P; C-T; D-T; E-S done
clear
C)
A-Q; B-P; C-T; D-S; E-R done
clear
D)
A-Q; B-P; C-T; D-R; E-S done
clear
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question_answer 35)
Which one of the following physical quantities is represented by the shaded area in the given graph?
A)
Torque done
clear
B)
Impulse done
clear
C)
Power done
clear
D)
Work done done
clear
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question_answer 36)
Two masses m and 9 m are moving with equal kinetic energies. The ratio of the magnitudes of their momenta is
A)
1 : 1 done
clear
B)
1 : 3 done
clear
C)
3 : 1 done
clear
D)
1 : 9 done
clear
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question_answer 37)
A particle oscillates in one dimension about the equilibrium position subject to a force \[{{F}_{xx}}(x)\] that has an associated potential energy U(x). If k is the force constant, which one of the following relations is true? [NDA]
A)
\[{{F}_{x}}(x)=k{{x}^{2}}\] done
clear
B)
\[{{F}_{x}}(x)=kx\] done
clear
C)
\[U(x)=\frac{1}{2}kx\] done
clear
D)
\[U(x)=\frac{1}{2}{{k}^{2}}x\] done
clear
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question_answer 38)
If a light body and a heavy body have equal momentum, then [NDA]
A)
the lighter body has greater energy than the heavier body done
clear
B)
the lighter body has lesser kinetic energy than the heavier body done
clear
C)
the kinetic energy of the lighter body is equal to the kinetic energy of the heavier body done
clear
D)
the kinetic energy of both the bodies are independent of momentum. done
clear
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question_answer 39)
A rubber ball dropped from 24 m height loses its kinetic energy by 25%. What is the height to which it rebounds.
A)
6m done
clear
B)
12m done
clear
C)
18m done
clear
D)
24m done
clear
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question_answer 40)
The potential energy of a freely falling object decreases progressively.
A)
The law of conservation of energy is violated done
clear
B)
Potential energy gets converted into kinetic energy progressively done
clear
C)
Sum of Potential Energy and Kinetic Energy at any point during the free fall remains constant done
clear
D)
Both [b] and [c] done
clear
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question_answer 41)
In which of the following examples, work done is negative?
A)
Work done by the force of gravity on a moving aeroplane done
clear
B)
Work done by the force of gravity on a ball thrown upwards done
clear
C)
Work done by the force of gravity on a freely falling object done
clear
D)
Work done by the force of gravity on a satellite done
clear
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question_answer 42)
Assertion: A man gets completely exhausted in trying to push a stationary wall. Reason: Work done by the man on the wall is zero.
A)
If both Assertion and Reason are correct and Reason is the correct explanation of Assertion. done
clear
B)
If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion. done
clear
C)
If Assertion is correct but Reason is incorrect. done
clear
D)
If Assertion is incorrect but Reason is correct. done
clear
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question_answer 43)
A boy has four options to move a body through 3m as indicated. In which case is maximum work done?
A)
Push over an inclined plane done
clear
B)
Lift vertically upwards done
clear
C)
Push over smooth rollers done
clear
D)
Push on a plane horizontal surface done
clear
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question_answer 44)
An electrical appliance of 500 W is used for 5 hours per day. Energy consumed in 30 days will be
A)
2.5 kWh done
clear
B)
25 kWh done
clear
C)
75 kWh done
clear
D)
None of these done
clear
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question_answer 45)
Two persons do the same amount of work, one in 10 s and the other in 20 s. Find the ratio of the power used by the first person to that by the second person.
A)
6 : 4 done
clear
B)
2 : 1 done
clear
C)
5 : 2 done
clear
D)
4 : 3 done
clear
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question_answer 46)
Rahul takes I minute to raise a box to a height of 1 metre and Rohan takes 1/2 minute to do so. Comment on the energy by the two.
A)
Energy spent by the Rahul is more. done
clear
B)
Energy spent by both Rahul and Rohan is same. done
clear
C)
Energy spent by the Rohan is more done
clear
D)
Cannot be said done
clear
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question_answer 47)
Gravitational potential energy of an object will
A)
increase by increasing the path along which the object is moved done
clear
B)
decrease by increasing the path along w4iich the object is moved done
clear
C)
not effected by changing the path, provided the overall height is same done
clear
D)
None of these done
clear
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question_answer 48)
When you compress a coil spring you do work on it. The elastic potential energy
A)
increases done
clear
B)
decreases done
clear
C)
disappears done
clear
D)
remains the same done
clear
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question_answer 49)
No work is done when
A)
a nail is plugged into a wooden board done
clear
B)
a box is pushed along a horizontal floor done
clear
C)
there is no component of force parallel to the direction of motion done
clear
D)
there is no component of force normal to the direction of force done
clear
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question_answer 50)
Two identical particles move towards each other with velocity 2v and v respectively. The velocity of centre of mass is
A)
v done
clear
B)
v/3 done
clear
C)
v/2 done
clear
D)
zero done
clear
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question_answer 51)
A solid sphere is rotating in free space. If the radius of the sphere is increased keeping mass same which one of the following will not be affected?
A)
Angular velocity done
clear
B)
Angular momentum done
clear
C)
Moment of inertia done
clear
D)
Rotational kinetic energy done
clear
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question_answer 52)
A couple is acting on a two particle systems. The resultant motion will be
A)
purely rotational motion done
clear
B)
purely linear motion done
clear
C)
both a and b done
clear
D)
neither of a and b done
clear
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question_answer 53)
A simple machine helps a person in doing: [IAS Prelim]
A)
less work done
clear
B)
the same amount of work with lesser force done
clear
C)
the same amount of work slowly done
clear
D)
the same amount of work much faster done
clear
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question_answer 54)
The wide handle of screw is based upon
A)
Newton's second law of motion done
clear
B)
law of conservation of linear momentum done
clear
C)
turning moment of force done
clear
D)
None of these done
clear
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question_answer 55)
For a particle revolving in a circular path, the acceleration of the particle is [NDA]
A)
along the tangent done
clear
B)
along the radius done
clear
C)
zero done
clear
D)
along the circumference of the circle done
clear
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question_answer 56)
A fan is moving around its axis, What will be its motion regarded as?
A)
Pure rolling done
clear
B)
Rolling with shipping done
clear
C)
Skidding done
clear
D)
Pure rotation done
clear
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question_answer 57)
A composite disc is to be made using equal masses of aluminium and iron so that it has as high a moment of inertia as possible. This is possible when
A)
the surfaces of the disc are made of iron with aluminium inside done
clear
B)
the whole of aluminium is kept in the core and the iron at the outer rim of the disc done
clear
C)
the whole of the iron is kept in the core and the aluminium at the outer rim of the disc done
clear
D)
the whole disc is made with thin alternate sheets of iron and aluminium done
clear
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question_answer 58)
During summersault, a swimmer bends his body to
A)
increase moment of Inertia done
clear
B)
decrease moment of Inertia done
clear
C)
decrease the angular momentum done
clear
D)
reduce the angular velocity done
clear
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question_answer 59)
For a given mass and size, moment of inertia of a solid disc is
A)
more than that of a ring done
clear
B)
less than that of a ring done
clear
C)
equal to that of a ring done
clear
D)
depend on the material of ring and disc done
clear
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question_answer 60)
A gymnast takes turns with her arms & legs stretched. When she pulls her arms and legs [CDS]
A)
the angular velocity decreases done
clear
B)
the moment of inertia decreases done
clear
C)
the angular velocity stays constant done
clear
D)
the angular momentum increases done
clear
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