Mechanics: MCQ Test (50 questions)

Question 1 of 50

Why is it easier to burst a gas-filled balloon with a needle than with a nail?

AThe nail exerts more pressure on the balloon than the needle
BThe gas is more reactive with the needle
CThe nail is longer than the needle
DThe needle exerts more pressure on the balloon than the nail

Question 2 of 50

Ink comes out of fountain pen in an aeroplane because-

Aair pressure decreases with increasing altitude
BAir pressure increases with increasing altitude
CAir pressure remains unchanged with increasing altitude
Dnone of the above

Question 3 of 50

When an object is immersed, either fully or partially, in a liquid, its weight appears to decrease, and this apparent decrease in weight is equal to the weight of the liquid displaced by the object. This principle is:

ABernoulli's principle
BArchimedes' principle
CPascal's principle
DHooke's law

Question 4 of 50

What is the SI unit of 'force'?

AKelvin
BNewton
CPascal
DVolt

Question 5 of 50

The unit of 'work' is-

AJoule
BNewton
CWatt
DDine

Question 6 of 50

Conservation of energy means that-

AEnergy is created and destroyed
BEnergy can be created, not destroyed.
CEnergy cannot be created, but it can be destroyed.
DEnergy can neither be created nor destroyed.

Question 7 of 50

The work done to hold a 20 kg weight at a height of 1 m above the ground is

A20 joules
B200 joules
C981 joules
DZero Joules

Question 8 of 50

When two pieces of ice are pressed together, they stick together because-

AThe melting point of ice decreases due to increased pressure.
BThe melting point of ice increases with increasing pressure
CDue to high pressure, the melting point of ice first decreases and then increases.
DThere is no relation between pressure and melting point.

Question 9 of 50

Mosquitoes are reduced when kerosene is added to stagnant water because it-

Ainterferes with reproduction
BHighly toxic to mosquitoes
Cobstructs the breathing of larvae
Drepels mosquitoes

Question 10 of 50

The wall below the dam is made thick because-

AThe pressure of the liquid increases with increasing depth
Bfluid pressure decreases with increasing depth
CThe density of the liquid increases with increasing depth.
DThe density of a liquid decreases with increasing depth

Question 11 of 50

In the state of weightlessness, the shape of a candle flame will be-

Alonger
Bmore little
Cspherical
Dwill remain the same

Question 12 of 50

Angular momentum is equal to

Amoment of inertia x angular velocity
Bmass x angular velocity
Clinear velocity x angular velocity
Dmass x linear velocity

Question 13 of 50

On removing cream from milk-

AIncreases the density of milk
BThe density of milk decreases
CThe density of milk remains unchanged.
Dnone of these

Question 14 of 50

Energy is produced in the Sun by-

Aby nuclear fission
Bby nuclear fusion
Cby oxidation reactions
Dby reduction reactions

Question 15 of 50

Which of the following is the SI unit of thermodynamic temperature?

AFahrenheit
BCelsius
Cradian
DKelvin

Question 16 of 50

Often, light thatched or tin roofs are blown away during a strong storm because-

ARoofs have complex shapes
BRoofs are not tightly fastened
CHigh velocity air flowing over the roof creates pressure on the roof surface and the pressure below the roof remains normal.
DThatched roofs blow away by strong winds

Question 17 of 50

Parsec is the unit of-

Aof distance
Bof time
Cof the brightness of light
Dof magnetic force

Question 18 of 50

The ball keeps dancing in the water spray at the intersections because-

AAs the velocity of water increases, the pressure decreases.
BThe higher the velocity of the water, the higher the pressure
Cdue to the surface tension of water
Ddue to the viscosity of water

Question 19 of 50

A boy sitting in an open car traveling at a constant speed throws a ball straight up in the air. The ball falls

Abehind him
Bin front of him
Cin his hand
Dnext to him

Question 20 of 50

1 kPa/cm pressure is equivalent to-

A01 time
B1.0 times
C10.0 times
D100.0 times

Question 21 of 50

If a clock oscillating with a pendulum is taken from the Earth to the Moon, then the clock will be-

ALazy
BQuick
Cwill give the same time as Earth
Dwill stop working

Question 22 of 50

A ball is dropped from a tall building with a uniform acceleration of 9.8 m/s2. What will its velocity be after 3 seconds?

A9.8m/s.
B9.6m/s
C294m/s
D39.3m/s

Question 23 of 50

When a person lands on the moon, the substances present in his body-

Athe amount of matter changes
Bweight decreases and volume remains unchanged
Cchanges in load
DThere is a decrease in both volume and weight

Question 24 of 50

Why does an iron needle float on the surface of water?

Adue to buoyancy of water
Bdue to surface tension
Cdue to viscosity
Ddue to gravitational force

Question 25 of 50

Which of the following works on the basis of conservation of linear force?

ARocket
Bhelicopter
CJet
Dplane

Question 26 of 50

A liquid droplet assumes a spherical shape

Adue to surface tension
Bdue to viscosity
Cdue to upward thrust
Ddue to gravity

Question 27 of 50

The position and direction of any object, whether stationary or moving, remain unchanged unless an external force acts on it. This is—

ANewton's first law of motion
BNewton's second law of motion
CNewton's third law of motion
DGalileo's law of motion

Question 28 of 50

If the mass of the Earth remains the same and the radius decreases by 1%, then the value of 'g' on the surface of the Earth-

Awill increase by 0.5%
Bwill increase by 2%
Cwill decrease by 0.5%
Dwill decrease by 2%

Question 29 of 50

Any boat will sink if it removes water from its-

Aequal in volume
Bequal to the weight
Cequal to the back
Dequal to the density

Question 30 of 50

In which unit can the resistivity of a substance be expressed?

Aohm
Bohm/cm
Cohm cm
Dohm cm2

Question 31 of 50

Which of the following laws justifies the statement that matter can neither be created nor destroyed?

Alaw of conservation of energy
BLe Chatelier's law
CLaw of conservation of mass
Dlaw of osmosis

Question 32 of 50

Two stones of different masses are dropped simultaneously from the top of a building.

Athe smaller stone reaches the ground first
BThe bigger stone reaches the ground first.
CBoth stones reach the ground at the same time.
DDepends on the composition of the stone

Question 33 of 50

A corked bottle filled with water will break on freezing because-

AThe bottle shrinks when frozen
BThe volume of water decreases when it freezes
CThe volume of water increases when it freezes
Dglass is a bad conductor of heat

Question 34 of 50

Which one of the following statements is not correct?

AThe weight of any body is different on different planets.
BThe mass of any body is the same on Earth, on the Moon and in the empty sky.
CThe state of weightlessness of any body occurs when it is balanced against the gravitational force acting on it.
DThe weight and mass of any body at sea level on the surface of the Earth are the same.

Question 35 of 50

If a carpet is beaten with a stick to clean it, which rule applies to it?

Afirst law of motion
Bsecond law of motion
Cthird law of motion
DCombination of the first and second laws of motion

Question 36 of 50

What is the property of a body called by which it resists any change in its state of rest or uniform motion in a straight line?

Aimmobility
Binertia
Ctotal weight
Dinactivity

Question 37 of 50

For a steel boat floating in a lake, what is the weight of the water displaced by the boat?

Aless than the boat's weight
Bmore than the weight of the boat
Cequal to the weight of that part of the boat which is below the surface of the lake water
Dequal to the weight of the boat

Question 38 of 50

A stone tied to a string is rotated rapidly in a circle. If the string suddenly breaks while rotating, then-

AThe stone touches and flies linearly
BThe stone moves inwards radially
CThe stone moves radially outwards
DThe speed of the stone depends on its velocity.

Question 39 of 50

What is the unit of the physical quantity light?

ASiemens
BTesla
CLux
DWeber

Question 40 of 50

body will remain at rest unless acted upon by an external force. Whose statement is this?

ANewton
BEinstein
CArchimedes
DGalileo

Question 41 of 50

If a cyclist turns around a bend, he-

Abends outward
Bbends inward
Cforward bends
DDoes not bend at all

Question 42 of 50

A particle has mass and momentum p. Its kinetic energy will be-

Amp
Bp²m
Cp²/m
Dp²/2m

Question 43 of 50

When milk is churned vigorously, why does the cream separate from it?

Acentrifugal force
Bcentripetal force
Cgravitational force
Dfriction force

Question 44 of 50

The synchronizing satellite revolves around the Earth in-

AEast to west
BWest to East
CNorth South
DSouth to North

Question 45 of 50

What is the name of the force by which the Earth pulls all objects towards itself?

Apush
Bresistance
Cair pressure
Dgravity

Question 46 of 50

The reason why water droplets do not stick to oily surfaces is-

Alack of adhesive force
BWater is lighter than oil.
CCan't get along with each other
DSurface tension

Question 47 of 50

What is the unit of measurement of 'Hertz'?

Awavelength
Bclarity of waves
Cintensity of waves
Dfrequency of waves

Question 48 of 50

The unit of viscosity is-

APoise
BPascal
CPowijuli
DNone of these

Question 49 of 50

Swimming in water is possible due to which law of Newton's motion?

AFirst Law
BSecond Law
CThird Law
DAll of the above

Question 50 of 50

The scientist associated with buoyancy is-

AArchimedes
BNewton
CLouis Pasteur
Dall of which