Which physical quantity has the same dimensions as work?
A
Torque
B
Power
C
Pressure
D
Momentum
Question 6Single Answer
The dimensional formula of Planck's constant is?
A
[ML²T⁻¹]
B
[MLT⁻¹]
C
[ML²T⁻²]
D
[M⁻¹L²T⁻¹]
Question 7Single Answer
Which quantity is dimensionless?
A
Surface tension
B
Strain
C
Stress
D
Viscosity
Question 8Single Answer
The number of significant figures in 0.005060 is?
A
2
B
3
C
4
D
5
Question 9Single Answer
The least count of a measuring instrument represents?
A
Percentage error
B
Minimum measurable value accurately resolved
C
Average error
D
Maximum measurable value
Question 10Single Answer
Which instrument is generally used to measure the diameter of a thin wire accurately?
A
Screw gauge
B
Measuring tape
C
Meter scale
D
Stopwatch
Question 11Single Answer
The dimensional formula of gravitational constant G is?
A
[ML³T⁻²]
B
[M⁻¹L³T⁻²]
C
[M⁻¹L²T⁻²]
D
[ML⁻²T⁻¹]
Question 12Single Answer
Which pair has the same dimensions?
A
Energy and pressure
B
Impulse and momentum
C
Force and power
D
Velocity and acceleration
Question 13Single Answer
One nanometre is equal to?
A
10⁻¹⁰ m
B
10⁻⁹ m
C
10⁻⁶ m
D
10⁻¹² m
Question 14Single Answer
The SI unit of solid angle is?
A
Steradian
B
Degree
C
Radian
D
Candela
Question 15Single Answer
Which error can be reduced by taking a large number of observations?
A
Random error
B
Systematic error
C
Instrumental zero error
D
Calibration error
Question 16Single Answer
The slope of a displacement-time graph gives?
A
Acceleration
B
Momentum
C
Velocity
D
Force
Question 17Single Answer
The slope of a velocity-time graph represents?
A
Momentum
B
Acceleration
C
Distance
D
Displacement
Question 18Single Answer
The area under a velocity-time graph represents?
A
Power
B
Displacement
C
Force
D
Acceleration
Question 19Single Answer
A body moving with constant velocity has acceleration equal to?
A
Unity
B
Infinity
C
g
D
Zero
Question 20Single Answer
A particle starts from rest with acceleration 4 m/s². Its velocity after 5 s is?
A
10 m/s
B
20 m/s
C
15 m/s
D
25 m/s
Question 21Single Answer
A car travels 100 m in 5 s at uniform speed. Its speed is?
A
20 m/s
B
10 m/s
C
25 m/s
D
50 m/s
Question 22Single Answer
At the highest point of a vertically projected body's motion, its instantaneous velocity is?
A
Equal to g
B
Zero
C
Maximum
D
Infinite
Question 23Single Answer
At the highest point of vertical motion, the acceleration of a projectile is?
A
g downward
B
g upward
C
Zero
D
Dependent on mass
Question 24Single Answer
For maximum horizontal range on level ground, the angle of projection should be?
A
90°
B
45°
C
60°
D
30°
Question 25Single Answer
Two projectiles projected with the same speed at complementary angles have equal?
A
Maximum heights
B
Times of flight
C
Horizontal ranges
D
Vertical velocities
Question 26Single Answer
The trajectory of a projectile near Earth's surface, neglecting air resistance, is?
A
Circular
B
Elliptical
C
Parabolic
D
Hyperbolic
Question 27Single Answer
Uniform circular motion is accelerated motion because?
A
Speed changes
B
Direction of velocity changes
C
Mass changes
D
Radius changes continuously
Question 28Single Answer
Centripetal acceleration is directed?
A
Tangentially
B
Away from the centre
C
Towards the centre
D
Along velocity
Question 29Single Answer
If the velocity of a body doubles, its centripetal acceleration for the same radius becomes?
A
Half
B
Four times
C
Double
D
Eight times
Question 30Single Answer
Relative velocity of two objects moving in the same direction is the?
A
Difference of their velocities
B
Sum of their speeds
C
Product of their speeds
D
Average of their speeds
Question 31Single Answer
Newton's first law is also called the law of?
A
Momentum
B
Inertia
C
Gravitation
D
Acceleration
Question 32Single Answer
Newton's second law relates force to the rate of change of?
A
Energy
B
Momentum
C
Position
D
Density
Question 33Single Answer
According to Newton's third law, action and reaction forces?
A
Always cancel each other
B
Act on different bodies
C
Act on the same body
D
Have different magnitudes
Question 34Single Answer
The SI unit of impulse is?
A
N·m
B
N·s
C
N/s
D
J/s
Question 35Single Answer
Impulse is equal to change in?
A
Acceleration
B
Momentum
C
Kinetic energy
D
Power
Question 36Single Answer
Inertia of a body depends primarily upon its?
A
Velocity
B
Acceleration
C
Mass
D
Volume
Question 37Single Answer
Friction acts?
A
Perpendicular to the surface
B
Opposite to relative motion or its tendency
C
Always along motion
D
Vertically upward
Question 38Single Answer
Limiting friction is proportional to?
A
Normal reaction
B
Area of contact only
C
Velocity
D
Volume
Question 39Single Answer
The coefficient of friction is?
A
Measured in newton
B
Dimensionless
C
Measured in joule
D
Measured in metre
Question 40Single Answer
A 5 kg body accelerates at 2 m/s². The net force is?
A
10 N
B
5 N
C
2.5 N
D
20 N
Question 41Single Answer
A passenger falls forward when a moving bus suddenly stops because of?
A
Inertia of motion
B
Inertia of rest
C
Friction only
D
Gravitation
Question 42Single Answer
The apparent weight of a person in a freely falling lift is?
A
mg
B
2mg
C
mg/2
D
Zero
Question 43Single Answer
When a lift accelerates upward, the apparent weight of a passenger is?
A
Less than actual weight
B
Greater than actual weight
C
Zero
D
Always equal to actual weight
Question 44Single Answer
The centripetal force on a body in uniform circular motion does?
A
Positive work
B
Negative work
C
Infinite work
D
Zero work
Question 45Single Answer
Work done by a constant force is zero when the angle between force and displacement is?
A
90°
B
45°
C
0°
D
180°
Question 46Single Answer
The SI unit of work is?
A
Joule
B
Watt
C
Newton
D
Pascal
Question 47Single Answer
Power is defined as?
A
Energy per unit volume
B
Work done per unit time
C
Force per unit area
D
Momentum per unit time
Question 48Single Answer
One watt is equal to?
A
1 N/s
B
1 J/s
C
1 J·s
D
1 N·s
Question 49Single Answer
Kinetic energy of a body of mass m moving with speed v is?
A
½mv²
B
mv²
C
mv
D
½m²v
Question 50Single Answer
The work-energy theorem states that net work done equals the change in?
A
Momentum
B
Potential energy
C
Angular momentum
D
Kinetic energy
Important Questions Package
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Physics
Question 51Single Answer
Gravitational potential energy near Earth's surface is?
A
mv²
B
mgh
C
mg/h
D
gh/m
Question 52Single Answer
A conservative force has work that is?
A
Always zero
B
Path independent
C
Path dependent
D
Always positive
Question 53Single Answer
Which is a conservative force?
A
Kinetic friction
B
Viscous force
C
Gravitational force
D
Air resistance
Question 54Single Answer
Mechanical energy remains conserved when?
A
Only conservative forces do work
B
Friction dominates
C
External dissipative forces act
D
Momentum is zero
Question 55Single Answer
A 2 kg body moving at 3 m/s has kinetic energy equal to?
A
3 J
B
6 J
C
9 J
D
18 J
Question 56Single Answer
If the speed of a body becomes three times, its kinetic energy becomes?
A
3 times
B
6 times
C
27 times
D
9 times
Question 57Single Answer
The potential energy stored in a spring stretched by x is?
A
kx
B
½kx²
C
kx²
D
½k²x
Question 58Single Answer
The rotational analogue of mass is?
A
Moment of inertia
B
Torque
C
Angular velocity
D
Angular momentum
Question 59Single Answer
Torque is the rotational analogue of?
A
Energy
B
Force
C
Momentum
D
Velocity
Question 60Single Answer
Angular momentum of a rigid body rotating about a fixed principal axis is?
A
Iω²
B
Iω
C
I/ω
D
½Iω²
Question 61Single Answer
Rotational kinetic energy is?
A
½Iω²
B
½Iω
C
Iω
D
I²ω
Question 62Single Answer
Moment of inertia depends upon?
A
Only torque
B
Distribution of mass about the axis
C
Only angular velocity
D
Only total mass
Question 63Single Answer
The SI unit of moment of inertia is?
A
N m
B
kg m²
C
kg m
D
J s
Question 64Single Answer
The moment of inertia of a thin ring about an axis through its centre perpendicular to its plane is?
A
2MR²
B
MR²
C
½MR²
D
¼MR²
Question 65Single Answer
The moment of inertia of a uniform disc about its central axis is?
A
⅔MR²
B
½MR²
C
MR²
D
2MR²
Question 66Single Answer
The parallel-axis theorem is expressed as?
A
I = Md²
B
I = Icm + Md²
C
I = Icm − Md²
D
I = Icm/Md²
Question 67Single Answer
In the absence of external torque, which quantity remains conserved?
A
Moment of inertia
B
Angular momentum
C
Angular acceleration
D
Force
Question 68Single Answer
A skater spinning with arms extended spins faster after pulling the arms inward because?
A
Mass decreases
B
Angular momentum is conserved
C
Torque increases indefinitely
D
Gravity decreases
Question 69Single Answer
For pure rolling without slipping, the relation between linear and angular speed is?
A
v = Rω
B
v = ω/R
C
v = R/ω
D
v = Rω²
Question 70Single Answer
The centre of mass of a uniform circular ring lies?
A
On its circumference
B
At its geometric centre
C
Halfway to its circumference
D
Outside the ring
Question 71Single Answer
Newton's law of gravitation follows which inverse dependence on distance?
A
1/r
B
1/r²
C
1/r³
D
1/√r
Question 72Single Answer
The value of gravitational acceleration at Earth's centre is?
A
g
B
Zero
C
g/2
D
2g
Question 73Single Answer
Escape velocity from Earth's surface is approximately?
A
7.9 km/s
B
9.8 km/s
C
15.6 km/s
D
11.2 km/s
Question 74Single Answer
Orbital speed of a satellite close to Earth's surface is approximately?
A
11.2 km/s
B
7.9 km/s
C
5.6 km/s
D
15 km/s
Question 75Single Answer
The escape velocity from a planet is independent of the?
A
Planet's mass
B
Planet's radius
C
Gravitational constant
D
Mass of the escaping body
Question 76Single Answer
The gravitational potential at infinity is conventionally taken as?
A
One
B
Zero
C
Infinity
D
−1
Question 77Single Answer
Gravitational potential energy of two masses separated by r is?
A
GMm/r²
B
−GMm/r
C
GMm/r
D
−GMm/r²
Question 78Single Answer
Kepler's second law is a consequence of conservation of?
A
Angular momentum
B
Linear momentum
C
Energy only
D
Mass
Question 79Single Answer
Kepler's third law states that the square of orbital period is proportional to?
A
r
B
r³
C
r²
D
1/r²
Question 80Single Answer
A geostationary satellite has a period of approximately?
A
6 hours
B
24 hours
C
12 hours
D
48 hours
Question 81Single Answer
Weightlessness experienced by an astronaut in an orbiting spacecraft occurs because?
A
Earth's gravity is repulsive
B
Spacecraft and astronaut are in free fall together
C
Mass becomes zero
D
Gravity is absent
Question 82Single Answer
If Earth's mass remains unchanged but its radius decreases, surface gravity will?
A
Increase
B
Decrease
C
Remain unchanged
D
Become zero
Question 83Single Answer
Young's modulus is the ratio of?
A
Longitudinal stress to longitudinal strain
B
Longitudinal strain to stress
C
Shear stress to volume strain
D
Pressure to density
Question 84Single Answer
The SI unit of Young's modulus is?
A
N
B
Pa
C
J
D
W
Question 85Single Answer
Bulk modulus is associated with change in?
A
Length only
B
Volume
C
Shape only
D
Temperature
Question 86Single Answer
According to Hooke's law, within the elastic limit stress is proportional to?
A
Force
B
Strain
C
Area
D
Volume
Question 87Single Answer
The property by which a material regains its original shape after removal of deforming force is called?
A
Plasticity
B
Elasticity
C
Viscosity
D
Capillarity
Question 88Single Answer
Surface tension has SI unit?
A
N/m
B
N·m
C
N/m²
D
J/m
Question 89Single Answer
Surface tension arises mainly due to?
A
Nuclear forces
B
Cohesive molecular forces
C
Magnetic forces
D
Gravitational forces
Question 90Single Answer
The rise of liquid in a narrow tube is called?
A
Capillarity
B
Viscosity
C
Elasticity
D
Diffusion
Question 91Single Answer
The excess pressure inside a spherical liquid drop of radius r is?
A
T/r
B
2T/r
C
4T/r
D
T/2r
Question 92Single Answer
The excess pressure inside a soap bubble is?
A
T/r
B
2T/r
C
4T/r
D
8T/r
Question 93Single Answer
Viscosity is a measure of a fluid's?
A
Surface area
B
Internal resistance to flow
C
Density
D
Compressibility
Question 94Single Answer
According to Bernoulli's principle, where fluid speed is high, pressure tends to be?
A
High
B
Low
C
Infinite
D
Unchanged in all cases
Question 95Single Answer
Streamline flow generally occurs at?
A
Infinite velocity
B
Very high Reynolds number
C
Low Reynolds number
D
Zero density
Question 96Single Answer
According to Pascal's law, pressure applied to an enclosed fluid is transmitted?
A
Undiminished in all directions
B
Only upward
C
Only downward
D
Only horizontally
Question 97Single Answer
The zeroth law of thermodynamics provides the basis for the concept of?
A
Temperature
B
Entropy
C
Internal energy
D
Enthalpy
Question 98Single Answer
The first law of thermodynamics is essentially a statement of conservation of?
A
Momentum
B
Charge
C
Energy
D
Mass only
Question 99Single Answer
In an isothermal process for an ideal gas, change in internal energy is?
A
Positive
B
Zero
C
Negative
D
Infinite
Question 100Single Answer
In an adiabatic process, heat exchanged with surroundings is?
A
Positive
B
Negative
C
Equal to work always
D
Zero
Question 101Single Answer
In an isochoric process, the work done by the gas is?
A
Equal to pressure
B
Maximum
C
Positive infinity
D
Zero
Question 102Single Answer
In an isobaric process, which quantity remains constant?
A
Pressure
B
Temperature
C
Volume
D
Internal energy
Question 103Single Answer
The efficiency of a Carnot engine depends upon?
A
Temperatures of source and sink
B
Working substance only
C
Pressure only
D
Volume only
Question 104Single Answer
A heat engine converts?
A
Pressure into volume
B
Heat partly into mechanical work
C
Mass into charge
D
Mechanical work completely into heat only
Question 105Single Answer
Entropy of an isolated system in a spontaneous irreversible process?
A
Becomes negative
B
Increases
C
Always remains zero
D
Decreases
Question 106Single Answer
For a reversible adiabatic process, entropy change is?
A
Positive
B
Zero
C
Negative
D
Infinite
Question 107Single Answer
The coefficient of performance of a refrigerator can be?
A
Always negative
B
Greater than 1
C
Always zero
D
Only less than 1
Question 108Single Answer
Absolute zero corresponds to?
A
0°C
B
−100°C
C
273°C
D
−273.15°C approximately
Question 109Single Answer
For an ideal gas, internal energy depends only on?
A
Temperature
B
Volume
C
Pressure
D
Density
Question 110Single Answer
Which thermodynamic quantity is a state function?
A
Heat
B
Work
C
Frictional loss
D
Internal energy
Question 111Single Answer
According to kinetic theory, gas pressure arises due to?
A
Gravitational force
B
Molecular collisions with container walls
C
Molecular attraction only
D
Surface tension
Question 112Single Answer
The average translational kinetic energy of an ideal gas molecule is proportional to?
A
Absolute temperature
B
Pressure only
C
Volume only
D
Molecular radius
Question 113Single Answer
The mean translational kinetic energy per molecule of an ideal gas is?
A
kT
B
½kT
C
2kT
D
3kT/2
Question 114Single Answer
RMS speed of gas molecules is proportional to?
A
T²
B
√T
C
T
D
1/T
Question 115Single Answer
At a fixed temperature, lighter gas molecules have?
A
Same RMS speed as heavier molecules
B
Higher RMS speed
C
Lower RMS speed
D
Zero RMS speed
Question 116Single Answer
The number of degrees of freedom for a monatomic ideal gas is?
A
1
B
2
C
3
D
5
Question 117Single Answer
The molar specific heat at constant volume of a monatomic ideal gas is?
A
R/2
B
3R/2
C
R
D
5R/2
Question 118Single Answer
For an ideal gas, Mayer's relation is?
A
Cp + Cv = R
B
Cp − Cv = R
C
Cv − Cp = R
D
Cp/Cv = R
Question 119Single Answer
The ratio Cp/Cv is commonly represented by?
A
γ
B
β
C
α
D
λ
Question 120Single Answer
For a monatomic ideal gas, γ equals?
A
5/3
B
4/3
C
1
D
7/5
Question 121Single Answer
In simple harmonic motion, restoring force is proportional to?
A
Time
B
Displacement and opposite in direction
C
Acceleration squared
D
Velocity
Question 122Single Answer
The acceleration in SHM is?
A
ωx
B
−ωx
C
ω²/x
D
−ω²x
Question 123Single Answer
At the mean position in SHM, the speed is?
A
Zero
B
Maximum
C
Minimum but nonzero
D
Infinite
Question 124Single Answer
At an extreme position in SHM, the velocity is?
A
Zero
B
Maximum
C
Equal to ω
D
Infinite
Question 125Single Answer
The time period of a simple pendulum for small oscillations is independent of its?
A
Length
B
Mass of bob
C
Gravitational acceleration
D
Both length and gravity
Question 126Single Answer
If the length of a simple pendulum becomes four times, its time period becomes?
A
Half
B
Double
C
Four times
D
Eight times
Question 127Single Answer
The time period of a mass-spring oscillator is proportional to?
A
k/m
B
√(k/m)
C
m/k
D
√(m/k)
Question 128Single Answer
Resonance occurs when driving frequency is approximately equal to the system's?
A
Zero frequency
B
Natural frequency
C
Maximum velocity
D
Damping constant
Question 129Single Answer
Wave speed is equal to?
A
Frequency² × wavelength
B
Frequency × wavelength
C
Wavelength/time period squared
D
Frequency/wavelength
Question 130Single Answer
Sound waves in air are primarily?
A
Electromagnetic
B
Longitudinal
C
Transverse
D
Stationary only
Question 131Single Answer
Electromagnetic waves are?
A
Longitudinal
B
Transverse
C
Mechanical
D
Unable to travel in vacuum
Question 132Single Answer
The distance between two successive crests is called?
A
Frequency
B
Wavelength
C
Amplitude
D
Phase
Question 133Single Answer
Frequency is measured in?
A
Hertz
B
Joule
C
Pascal
D
Newton
Question 134Single Answer
The phenomenon of beats is due to interference between waves having?
A
Exactly equal amplitudes only
B
Slightly different frequencies
C
Zero frequencies
D
Very different wavelengths only
Question 135Single Answer
Coulomb's law describes the force between?
A
Magnetic poles only
B
Point charges
C
Current-carrying wires only
D
Moving masses
Question 136Single Answer
The electrostatic force between two point charges varies inversely as?
A
Cube of distance
B
Square of distance
C
Distance
D
Square root of distance
Question 137Single Answer
The SI unit of electric charge is?
A
Coulomb
B
Volt
C
Ampere
D
Farad
Question 138Single Answer
Electric field at a point is defined as force per unit?
A
Area
B
Positive test charge
C
Mass
D
Energy
Question 139Single Answer
The SI unit of electric field is?
A
C/N
B
N/C
C
J/C²
D
C·m
Question 140Single Answer
Electric field lines originate from?
A
Infinity only
B
Positive charges
C
Neutral bodies only
D
Negative charges
Question 141Single Answer
Electric field lines terminate on?
A
Negative charges
B
Positive charges
C
Protons only
D
Neutrons
Question 142Single Answer
Electric field lines can never?
A
Intersect each other
B
Start from positive charge
C
Curve
D
Terminate on negative charge
Question 143Single Answer
Electric potential is a?
A
Scalar quantity
B
Vector quantity
C
Tensor quantity only
D
Dimensionless quantity
Question 144Single Answer
The SI unit of electric potential is?
A
Ampere
B
Volt
C
Coulomb
D
Farad
Question 145Single Answer
The electric potential due to a point charge varies as?
A
r²
B
1/r²
C
1/r
D
1/r³
Question 146Single Answer
The electric field inside a conductor in electrostatic equilibrium is?
A
Maximum
B
Zero
C
Infinite
D
Dependent only on volume
Question 147Single Answer
Excess charge on an isolated conductor resides on its?
A
Surface
B
Entire volume uniformly
C
Centre only
D
Nucleus
Question 148Single Answer
The capacitance of an isolated conductor depends primarily on its?
A
Charge stored only
B
Potential only
C
Current
D
Geometry and surrounding medium
Question 149Single Answer
The SI unit of capacitance is?
A
Weber
B
Farad
C
Henry
D
Tesla
Question 150Single Answer
When capacitors are connected in parallel, their equivalent capacitance is?
