Mechanics: MCQ Test (25 questions)

Question 1 of 25

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 2 of 25

A geostationary satellite moves continuously in its orbit. This happens due to the effect of centrifugal force, which is produced by:

Arocket engines that propel satellites
Bthe gravity exerted by the Earth on the satellite
Cthe gravitational force exerted by the Sun on the satellite
Dthe gravity exerted by the satellite on the Earth

Question 3 of 25

If the length of a simple pendulum is increased by 4%, then its time period-

Awill increase by 8%
Bwill increase by 2%
Cwill increase by 4%
DNone of these

Question 4 of 25

Will remain unchanged when the quantity of the substance changes?

Avolume
BBurden
CMass
Ddensity

Question 5 of 25

An egg sinks in soft water but floats in a concentrated salt solution because-

AThe egg absorbs salt from the solution and expands
BThe albumin dissolves in the salt solution and the egg becomes lighter.
CThe density of the salt solution becomes greater than the density of the egg.
DWater has high surface tension.

Question 6 of 25

The unit of 'work' is-

AJoule
BNewton
CWatt
DDine

Question 7 of 25

AccelerationknowntoOfCorrectFormulaWho,LikeIs ,

Aa=(vu)/t
Ba=u+vt
Ca=(v+u)/t
Da=(v+u)/2

Question 8 of 25

Hooke's principle is related to which of the following?

Aliquid pressure
Belasticity
Cradioactivity
DNone of these

Question 9 of 25

Which of the following does not have a unit of Newton meter?

AForce
Bkinetic energy
CWork
Denergy

Question 10 of 25

On whose principle does hydraulic brake work?

APascal's law
BBernoulli's theorem
CThomson's law
DNewton's laws

Question 11 of 25

When we sit or lie down on a rubber-padded seat, its shape changes. Such materials are found in-

Akinetic energy
Bpotential energy
CStored energy
Dfission energy

Question 12 of 25

The SI unit of momentum is

AAmpere
Bkgm/sec
CJoule
Dkgm

Question 13 of 25

A runner runs for some distance before taking a long jump because-

ARunning makes jumping easier
BThis warms his body.
CThe inertia of his body while jumping helps him cover a greater distance.
DHe doesn't slip when he jumps

Question 14 of 25

A boy suddenly sits down on a rotating round table. What effect will this have on the table's angular velocity?

Awill decrease
Bwill increase
Cwill remain the same
DNothing can be said

Question 15 of 25

Why are railway tracks banked on their banks?

AThe horizontal component of the train's weight can be used to obtain the required centrifugal force.
BNo frictional force can be generated between the wheels of the train and the tracks.
CThe horizontal component of the train's weight can be used to obtain the required centripetal force.
DThe train could not fall inwards

Question 16 of 25

Bernoulli's principle states the conservation of which of the following?

AMass
Benergy
CLinear momentum
Dpressure

Question 17 of 25

Which of the following units measures the same quantity as the SI unit 'Pascal'?

AJoule
BWatt
CTor
DNewton

Question 18 of 25

The amount of buoyancy obtained by a solid partially or completely immersed in a liquid depends on—

Athe amount of liquid displaced by the solid
Bon the mass of the solid
Con the weight of the solid
Dnone of these

Question 19 of 25

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 20 of 25

The SI unit of power 'Watt' is equivalent to what?

Akg m s 2
Bkg m 2 to 2
Ckg m2 to 3
Dnone of these

Question 21 of 25

Heavy icebergs melt from the bottom rather than the top because-

AThe temperature of the lower floor is higher
BThe melting point decreases due to higher pressure at the bottom.
CIce is not a real solid.
Dnone of the above

Question 22 of 25

Astronauts cannot stand upright in space because—

Athere is no gravity
BThe force of viscosity is very strong in the atmosphere.
CThe solar wind exerts an upward force
Datmospheric pressure is very low

Question 23 of 25

The acceleration produced in a body by an unbalanced force-

Ais inversely proportional to force
Bis directly proportional to the force
Cindependent of the force acting on it
Dis zero

Question 24 of 25

polythene balloon filled with hydrogen is released from the earth's surface. As it rises higher in the atmosphere-

Athe size of the balloon will decrease
BThe balloon will flatten into a disc shape.
CThe size of the balloon will increase
DThe size and shape of the balloon will remain the same.

Question 25 of 25

A person climbing a hill leans forward because-

Acan walk fast
BReduce the chance of slipping
Cto conserve power
DTo increase durability